1 | /*-------------------------------------------------------------------------+ |
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2 | | timer.c v1.1 - PC386 BSP - 1997/08/07 |
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3 | +--------------------------------------------------------------------------+ |
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4 | | This file contains the PC386 timer package. |
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5 | +--------------------------------------------------------------------------+ |
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6 | | NOTE: It is important that the timer start/stop overhead be determined |
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7 | | when porting or modifying this code. |
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8 | +--------------------------------------------------------------------------+ |
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9 | | (C) Copyright 1997 - |
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10 | | - NavIST Group - Real-Time Distributed Systems and Industrial Automation |
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11 | | |
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12 | | http://pandora.ist.utl.pt |
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13 | | |
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14 | | Instituto Superior Tecnico * Lisboa * PORTUGAL |
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15 | +--------------------------------------------------------------------------+ |
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16 | | Disclaimer: |
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17 | | |
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18 | | This file is provided "AS IS" without warranty of any kind, either |
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19 | | expressed or implied. |
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20 | +--------------------------------------------------------------------------+ |
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21 | | This code is base on: |
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22 | | timer.c,v 1.7 1995/12/19 20:07:43 joel Exp - go32 BSP |
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23 | | |
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24 | | Rosimildo daSilva -ConnectTel, Inc - Fixed infinite loop in the Calibration |
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25 | | routine. I've seen this problems with faster machines ( pentiums ). Sometimes |
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26 | | RTEMS just hangs at startup. |
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27 | | |
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28 | | With the following copyright notice: |
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29 | | ************************************************************************** |
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30 | | * COPYRIGHT (c) 1989-1999. |
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31 | | * On-Line Applications Research Corporation (OAR). |
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32 | | * |
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33 | | * The license and distribution terms for this file may be |
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34 | | * found in found in the file LICENSE in this distribution or at |
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35 | | * http://www.rtems.com/license/LICENSE. |
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36 | | ************************************************************************** |
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37 | | |
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38 | | $Id$ |
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39 | +--------------------------------------------------------------------------*/ |
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40 | |
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41 | |
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42 | #include <stdlib.h> |
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43 | |
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44 | #include <bsp.h> |
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45 | #include <irq.h> |
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46 | |
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47 | /*-------------------------------------------------------------------------+ |
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48 | | Constants |
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49 | +--------------------------------------------------------------------------*/ |
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50 | #define AVG_OVERHEAD 0 /* 0.1 microseconds to start/stop timer. */ |
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51 | #define LEAST_VALID 1 /* Don't trust a value lower than this. */ |
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52 | #define SLOW_DOWN_IO 0x80 /* io which does nothing */ |
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53 | |
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54 | #define TWO_MS (uint32_t)(2000) /* TWO_MS = 2000us (sic!) */ |
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55 | |
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56 | #define MSK_NULL_COUNT 0x40 /* bit counter available for reading */ |
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57 | |
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58 | #define CMD_READ_BACK_STATUS 0xE2 /* command read back status */ |
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59 | /*-------------------------------------------------------------------------+ |
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60 | | Global Variables |
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61 | +--------------------------------------------------------------------------*/ |
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62 | volatile uint32_t Ttimer_val; |
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63 | rtems_boolean Timer_driver_Find_average_overhead = TRUE; |
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64 | volatile unsigned int fastLoop1ms, slowLoop1ms; |
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65 | |
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66 | /*-------------------------------------------------------------------------+ |
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67 | | External Prototypes |
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68 | +--------------------------------------------------------------------------*/ |
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69 | extern void timerisr(void); |
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70 | /* timer (int 08h) Interrupt Service Routine (defined in 'timerisr.s') */ |
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71 | |
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72 | /*-------------------------------------------------------------------------+ |
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73 | | Pentium optimized timer handling. |
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74 | +--------------------------------------------------------------------------*/ |
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75 | #if defined(pentium) |
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76 | |
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77 | /*-------------------------------------------------------------------------+ |
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78 | | Function: rdtsc |
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79 | | Description: Read the value of PENTIUM on-chip cycle counter. |
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80 | | Global Variables: None. |
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81 | | Arguments: None. |
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82 | | Returns: Value of PENTIUM on-chip cycle counter. |
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83 | +--------------------------------------------------------------------------*/ |
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84 | static inline unsigned long long |
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85 | rdtsc(void) |
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86 | { |
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87 | /* Return the value of the on-chip cycle counter. */ |
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88 | unsigned long long result; |
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89 | asm volatile(".byte 0x0F, 0x31" : "=A" (result)); |
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90 | return result; |
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91 | } /* rdtsc */ |
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92 | |
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93 | |
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94 | /*-------------------------------------------------------------------------+ |
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95 | | Function: Timer_exit |
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96 | | Description: Timer cleanup routine at RTEMS exit. NOTE: This routine is |
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97 | | not really necessary, since there will be a reset at exit. |
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98 | | Global Variables: None. |
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99 | | Arguments: None. |
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100 | | Returns: Nothing. |
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101 | +--------------------------------------------------------------------------*/ |
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102 | void |
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103 | Timer_exit(void) |
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104 | { |
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105 | } /* Timer_exit */ |
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106 | |
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107 | |
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108 | /*-------------------------------------------------------------------------+ |
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109 | | Function: Timer_initialize |
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110 | | Description: Timer initialization routine. |
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111 | | Global Variables: Ttimer_val. |
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112 | | Arguments: None. |
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113 | | Returns: Nothing. |
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114 | +--------------------------------------------------------------------------*/ |
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115 | void |
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116 | Timer_initialize(void) |
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117 | { |
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118 | static rtems_boolean First = TRUE; |
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119 | |
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120 | if (First) |
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121 | { |
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122 | First = FALSE; |
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123 | |
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124 | atexit(Timer_exit); /* Try not to hose the system at exit. */ |
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125 | } |
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126 | Ttimer_val = rdtsc(); /* read starting time */ |
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127 | } /* Timer_initialize */ |
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128 | |
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129 | |
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130 | /*-------------------------------------------------------------------------+ |
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131 | | Function: Read_timer |
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132 | | Description: Read hardware timer value. |
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133 | | Global Variables: Ttimer_val, Timer_driver_Find_average_overhead. |
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134 | | Arguments: None. |
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135 | | Returns: Nothing. |
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136 | +--------------------------------------------------------------------------*/ |
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137 | uint32_t |
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138 | Read_timer(void) |
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139 | { |
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140 | register uint32_t total; |
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141 | |
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142 | total = (uint32_t)(rdtsc() - Ttimer_val); |
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143 | |
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144 | if (Timer_driver_Find_average_overhead) |
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145 | return total; |
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146 | else if (total < LEAST_VALID) |
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147 | return 0; /* below timer resolution */ |
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148 | else |
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149 | return (total - AVG_OVERHEAD); |
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150 | } /* Read_timer */ |
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151 | |
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152 | #else /* pentium */ |
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153 | |
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154 | /*-------------------------------------------------------------------------+ |
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155 | | Non-Pentium timer handling. |
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156 | +--------------------------------------------------------------------------*/ |
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157 | #define US_PER_ISR 250 /* Number of micro-seconds per timer interruption */ |
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158 | |
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159 | |
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160 | /*-------------------------------------------------------------------------+ |
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161 | | Function: Timer_exit |
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162 | | Description: Timer cleanup routine at RTEMS exit. NOTE: This routine is |
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163 | | not really necessary, since there will be a reset at exit. |
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164 | | Global Variables: None. |
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165 | | Arguments: None. |
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166 | | Returns: Nothing. |
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167 | +--------------------------------------------------------------------------*/ |
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168 | static void |
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169 | timerOff(const rtems_raw_irq_connect_data* used) |
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170 | { |
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171 | /* |
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172 | * disable interrrupt at i8259 level |
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173 | */ |
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174 | BSP_irq_disable_at_i8259s(used->idtIndex - BSP_IRQ_VECTOR_BASE); |
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175 | /* reset timer mode to standard (DOS) value */ |
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176 | outport_byte(TIMER_MODE, TIMER_SEL0|TIMER_16BIT|TIMER_RATEGEN); |
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177 | outport_byte(TIMER_CNTR0, 0); |
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178 | outport_byte(TIMER_CNTR0, 0); |
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179 | } /* Timer_exit */ |
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180 | |
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181 | |
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182 | static void |
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183 | timerOn(const rtems_raw_irq_connect_data* used) |
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184 | { |
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185 | /* load timer for US_PER_ISR microsecond period */ |
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186 | outport_byte(TIMER_MODE, TIMER_SEL0|TIMER_16BIT|TIMER_RATEGEN); |
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187 | outport_byte(TIMER_CNTR0, US_TO_TICK(US_PER_ISR) >> 0 & 0xff); |
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188 | outport_byte(TIMER_CNTR0, US_TO_TICK(US_PER_ISR) >> 8 & 0xff); |
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189 | /* |
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190 | * enable interrrupt at i8259 level |
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191 | */ |
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192 | BSP_irq_enable_at_i8259s(used->idtIndex - BSP_IRQ_VECTOR_BASE); |
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193 | } |
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194 | |
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195 | static int |
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196 | timerIsOn(const rtems_raw_irq_connect_data *used) |
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197 | { |
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198 | return BSP_irq_enabled_at_i8259s(used->idtIndex - BSP_IRQ_VECTOR_BASE);} |
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199 | |
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200 | static rtems_raw_irq_connect_data timer_raw_irq_data = { |
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201 | BSP_PERIODIC_TIMER + BSP_IRQ_VECTOR_BASE, |
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202 | timerisr, |
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203 | timerOn, |
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204 | timerOff, |
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205 | timerIsOn |
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206 | }; |
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207 | |
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208 | /*-------------------------------------------------------------------------+ |
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209 | | Function: Timer_exit |
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210 | | Description: Timer cleanup routine at RTEMS exit. NOTE: This routine is |
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211 | | not really necessary, since there will be a reset at exit. |
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212 | | Global Variables: None. |
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213 | | Arguments: None. |
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214 | | Returns: Nothing. |
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215 | +--------------------------------------------------------------------------*/ |
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216 | void |
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217 | Timer_exit(void) |
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218 | { |
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219 | i386_delete_idt_entry (&timer_raw_irq_data); |
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220 | } /* Timer_exit */ |
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221 | |
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222 | /*-------------------------------------------------------------------------+ |
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223 | | Function: Timer_initialize |
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224 | | Description: Timer initialization routine. |
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225 | | Global Variables: Ttimer_val. |
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226 | | Arguments: None. |
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227 | | Returns: Nothing. |
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228 | +--------------------------------------------------------------------------*/ |
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229 | void |
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230 | Timer_initialize(void) |
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231 | { |
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232 | static rtems_boolean First = TRUE; |
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233 | |
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234 | if (First) |
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235 | { |
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236 | First = FALSE; |
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237 | |
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238 | atexit(Timer_exit); /* Try not to hose the system at exit. */ |
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239 | if (!i386_set_idt_entry (&timer_raw_irq_data)) { |
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240 | printk("raw handler connexion failed\n"); |
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241 | rtems_fatal_error_occurred(1); |
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242 | } |
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243 | } |
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244 | /* wait for ISR to be called at least once */ |
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245 | Ttimer_val = 0; |
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246 | while (Ttimer_val == 0) |
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247 | continue; |
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248 | Ttimer_val = 0; |
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249 | } /* Timer_initialize */ |
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250 | |
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251 | |
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252 | /*-------------------------------------------------------------------------+ |
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253 | | Function: Read_timer |
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254 | | Description: Read hardware timer value. |
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255 | | Global Variables: Ttimer_val, Timer_driver_Find_average_overhead. |
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256 | | Arguments: None. |
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257 | | Returns: Nothing. |
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258 | +--------------------------------------------------------------------------*/ |
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259 | uint32_t |
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260 | Read_timer(void) |
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261 | { |
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262 | register uint32_t total, clicks; |
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263 | register uint8_t lsb, msb; |
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264 | |
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265 | outport_byte(TIMER_MODE, TIMER_SEL0|TIMER_LATCH); |
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266 | inport_byte(TIMER_CNTR0, lsb); |
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267 | inport_byte(TIMER_CNTR0, msb); |
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268 | clicks = (msb << 8) | lsb; |
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269 | total = (Ttimer_val * US_PER_ISR) + (US_PER_ISR - TICK_TO_US(clicks)); |
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270 | |
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271 | if (Timer_driver_Find_average_overhead) |
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272 | return total; |
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273 | else if (total < LEAST_VALID) |
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274 | return 0; /* below timer resolution */ |
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275 | else |
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276 | return (total - AVG_OVERHEAD); |
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277 | } |
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278 | |
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279 | #endif /* pentium */ |
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280 | |
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281 | |
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282 | /*-------------------------------------------------------------------------+ |
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283 | | Function: Empty_function |
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284 | | Description: Empty function used in time tests. |
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285 | | Global Variables: None. |
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286 | | Arguments: None. |
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287 | | Returns: Nothing. |
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288 | +--------------------------------------------------------------------------*/ |
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289 | rtems_status_code Empty_function(void) |
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290 | { |
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291 | return RTEMS_SUCCESSFUL; |
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292 | } /* Empty function */ |
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293 | |
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294 | |
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295 | /*-------------------------------------------------------------------------+ |
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296 | | Function: Set_find_average_overhead |
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297 | | Description: Set internal Timer_driver_Find_average_overhead flag value. |
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298 | | Global Variables: Timer_driver_Find_average_overhead. |
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299 | | Arguments: find_flag - new value of the flag. |
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300 | | Returns: Nothing. |
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301 | +--------------------------------------------------------------------------*/ |
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302 | void |
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303 | Set_find_average_overhead(rtems_boolean find_flag) |
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304 | { |
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305 | Timer_driver_Find_average_overhead = find_flag; |
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306 | } /* Set_find_average_overhead */ |
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307 | |
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308 | static unsigned short lastLoadedValue; |
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309 | |
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310 | /*-------------------------------------------------------------------------+ |
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311 | | Description: Loads timer 0 with value passed as arguemnt. |
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312 | | Returns: Nothing. Loaded value must be a number of clock bits... |
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313 | +--------------------------------------------------------------------------*/ |
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314 | void loadTimerValue( unsigned short loadedValue ) |
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315 | { |
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316 | lastLoadedValue = loadedValue; |
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317 | outport_byte(TIMER_MODE, TIMER_SEL0|TIMER_16BIT|TIMER_SQWAVE); |
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318 | outport_byte(TIMER_CNTR0, loadedValue & 0xff); |
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319 | outport_byte(TIMER_CNTR0, (loadedValue >> 8) & 0xff); |
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320 | } |
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321 | |
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322 | |
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323 | /*-------------------------------------------------------------------------+ |
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324 | | Description: Reads the current value of the timer, and converts the |
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325 | | number of ticks to micro-seconds. |
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326 | | Returns: number of clock bits elapsed since last load. |
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327 | +--------------------------------------------------------------------------*/ |
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328 | unsigned int readTimer0() |
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329 | { |
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330 | unsigned short lsb, msb; |
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331 | unsigned char status; |
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332 | unsigned int count; |
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333 | |
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334 | outport_byte(TIMER_MODE, (TIMER_RD_BACK | (RB_COUNT_0 & ~(RB_NOT_STATUS | RB_NOT_COUNT)))); |
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335 | inport_byte(TIMER_CNTR0, status); |
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336 | inport_byte(TIMER_CNTR0, lsb); |
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337 | inport_byte(TIMER_CNTR0, msb); |
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338 | count = ( msb << 8 ) | lsb ; |
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339 | if (status & RB_OUTPUT ) |
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340 | count += lastLoadedValue; |
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341 | |
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342 | return (2*lastLoadedValue - count); |
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343 | } |
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344 | |
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345 | void Timer0Reset() |
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346 | { |
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347 | loadTimerValue(0xffff); |
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348 | readTimer0(); |
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349 | } |
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350 | |
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351 | void fastLoop (unsigned int loopCount) |
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352 | { |
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353 | unsigned int i; |
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354 | for( i=0; i < loopCount; i++ )outport_byte( SLOW_DOWN_IO, 0 ); |
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355 | } |
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356 | |
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357 | void slowLoop (unsigned int loopCount) |
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358 | { |
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359 | unsigned int j; |
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360 | for (j=0; j <100 ; j++) { |
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361 | fastLoop (loopCount); |
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362 | } |
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363 | } |
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364 | |
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365 | /* |
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366 | * #define DEBUG_CALIBRATE |
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367 | */ |
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368 | void |
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369 | Calibrate_loop_1ms(void) |
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370 | { |
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371 | unsigned int offset, offsetTmp, emptyCall, emptyCallTmp, res, i, j; |
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372 | unsigned int targetClockBits, currentClockBits; |
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373 | unsigned int slowLoopGranularity, fastLoopGranularity; |
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374 | rtems_interrupt_level level; |
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375 | |
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376 | #ifdef DEBUG_CALIBRATE |
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377 | printk( "Calibrate_loop_1ms is starting, please wait ( but not too loooong. )\n" ); |
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378 | #endif |
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379 | targetClockBits = US_TO_TICK(1000); |
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380 | |
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381 | rtems_interrupt_disable(level); |
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382 | /* |
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383 | * Fill up the cache to get a correct offset |
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384 | */ |
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385 | Timer0Reset(); |
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386 | readTimer0(); |
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387 | /* |
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388 | * Compute the minimal offset to apply due to read counter register. |
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389 | */ |
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390 | offset = 0xffffffff; |
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391 | for (i=0; i <1000; i++) { |
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392 | Timer0Reset(); |
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393 | offsetTmp = readTimer0(); |
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394 | offset += offsetTmp; |
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395 | } |
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396 | offset = offset / 1000; /* compute average */ |
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397 | /* |
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398 | * calibrate empty call |
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399 | */ |
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400 | fastLoop (0); |
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401 | emptyCall = 0; |
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402 | j = 0; |
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403 | for (i=0; i <10; i++) { |
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404 | Timer0Reset(); |
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405 | fastLoop (0); |
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406 | res = readTimer0(); |
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407 | /* res may be inferior to offset on fast |
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408 | * machine because we took an average for offset |
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409 | */ |
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410 | if (res > offset) { |
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411 | ++j; |
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412 | emptyCallTmp = res - offset; |
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413 | emptyCall += emptyCallTmp; |
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414 | } |
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415 | } |
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416 | if (j == 0) emptyCall = 0; |
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417 | else emptyCall = emptyCall / j; /* compute average */ |
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418 | /* |
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419 | * calibrate fast loop |
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420 | */ |
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421 | Timer0Reset(); |
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422 | fastLoop (10000); |
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423 | res = readTimer0() - offset; |
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424 | if (res < emptyCall) { |
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425 | printk("Problem #1 in offset computation in Calibrate_loop_1ms in file libbsp/i386/pc386/timer/timer.c\n"); |
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426 | while (1); |
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427 | } |
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428 | fastLoopGranularity = (res - emptyCall) / 10000; |
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429 | /* |
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430 | * calibrate slow loop |
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431 | */ |
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432 | Timer0Reset(); |
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433 | slowLoop(10); |
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434 | res = readTimer0(); |
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435 | if (res < offset + emptyCall) { |
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436 | printk("Problem #2 in offset computation in Calibrate_loop_1ms in file libbsp/i386/pc386/timer/timer.c\n"); |
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437 | while (1); |
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438 | } |
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439 | slowLoopGranularity = (res - offset - emptyCall)/ 10; |
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440 | |
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441 | if (slowLoopGranularity == 0) { |
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442 | printk("Problem #3 in Calibrate_loop_1ms in file libbsp/i386/pc386/timer/timer.c\n"); |
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443 | while (1); |
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444 | } |
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445 | |
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446 | targetClockBits += offset; |
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447 | #ifdef DEBUG_CALIBRATE |
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448 | printk("offset = %u, emptyCall = %u, targetClockBits = %u\n", |
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449 | offset, emptyCall, targetClockBits); |
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450 | printk("slowLoopGranularity = %u fastLoopGranularity = %u\n", |
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451 | slowLoopGranularity, fastLoopGranularity); |
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452 | #endif |
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453 | slowLoop1ms = (targetClockBits - emptyCall) / slowLoopGranularity; |
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454 | if (slowLoop1ms != 0) { |
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455 | fastLoop1ms = targetClockBits % slowLoopGranularity; |
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456 | if (fastLoop1ms > emptyCall) fastLoop1ms -= emptyCall; |
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457 | } |
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458 | else |
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459 | fastLoop1ms = targetClockBits - emptyCall / fastLoopGranularity; |
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460 | |
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461 | if (slowLoop1ms != 0) { |
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462 | /* |
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463 | * calibrate slow loop |
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464 | */ |
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465 | |
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466 | while(1) |
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467 | { |
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468 | int previousSign = 0; /* 0 = unset, 1 = incrementing, 2 = decrementing */ |
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469 | Timer0Reset(); |
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470 | slowLoop(slowLoop1ms); |
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471 | currentClockBits = readTimer0(); |
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472 | if (currentClockBits > targetClockBits) { |
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473 | if ((currentClockBits - targetClockBits) < slowLoopGranularity) { |
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474 | /* decrement loop counter anyway to be sure slowLoop(slowLoop1ms) < targetClockBits */ |
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475 | --slowLoop1ms; |
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476 | break; |
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477 | } |
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478 | else { |
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479 | --slowLoop1ms; |
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480 | if (slowLoop1ms == 0) break; |
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481 | if (previousSign == 0) previousSign = 2; |
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482 | if (previousSign == 1) break; |
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483 | } |
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484 | } |
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485 | else { |
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486 | if ((targetClockBits - currentClockBits) < slowLoopGranularity) { |
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487 | break; |
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488 | } |
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489 | else { |
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490 | ++slowLoop1ms; |
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491 | if (previousSign == 0) previousSign = 1; |
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492 | if (previousSign == 2) break; |
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493 | } |
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494 | } |
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495 | } |
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496 | } |
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497 | /* |
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498 | * calibrate fast loop |
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499 | */ |
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500 | |
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501 | if (fastLoopGranularity != 0 ) { |
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502 | while(1) { |
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503 | int previousSign = 0; /* 0 = unset, 1 = incrementing, 2 = decrementing */ |
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504 | Timer0Reset(); |
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505 | if (slowLoop1ms != 0) slowLoop(slowLoop1ms); |
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506 | fastLoop(fastLoop1ms); |
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507 | currentClockBits = readTimer0(); |
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508 | if (currentClockBits > targetClockBits) { |
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509 | if ((currentClockBits - targetClockBits) < fastLoopGranularity) |
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510 | break; |
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511 | else { |
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512 | --fastLoop1ms; |
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513 | if (previousSign == 0) previousSign = 2; |
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514 | if (previousSign == 1) break; |
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515 | } |
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516 | } |
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517 | else { |
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518 | if ((targetClockBits - currentClockBits) < fastLoopGranularity) |
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519 | break; |
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520 | else { |
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521 | ++fastLoop1ms; |
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522 | if (previousSign == 0) previousSign = 1; |
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523 | if (previousSign == 2) break; |
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524 | } |
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525 | } |
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526 | } |
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527 | } |
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528 | #ifdef DEBUG_CALIBRATE |
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529 | printk("slowLoop1ms = %u, fastLoop1ms = %u\n", slowLoop1ms, fastLoop1ms); |
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530 | #endif |
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531 | rtems_interrupt_enable(level); |
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532 | |
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533 | } |
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534 | |
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535 | /*-------------------------------------------------------------------------+ |
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536 | | Function: Wait_X_1ms |
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537 | | Description: loop which waits at least timeToWait ms |
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538 | | Global Variables: loop1ms |
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539 | | Arguments: timeToWait |
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540 | | Returns: Nothing. |
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541 | +--------------------------------------------------------------------------*/ |
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542 | void |
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543 | Wait_X_ms( unsigned int timeToWait){ |
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544 | |
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545 | unsigned int j; |
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546 | |
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547 | for (j=0; j<timeToWait ; j++) { |
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548 | if (slowLoop1ms != 0) slowLoop(slowLoop1ms); |
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549 | fastLoop(fastLoop1ms); |
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550 | } |
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551 | |
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552 | } |
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553 | |
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554 | |
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555 | |
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556 | |
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557 | |
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558 | |
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