1 | /* |
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2 | * /dev/sci[0|1] for Hitachi SH 704X |
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3 | * |
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4 | * The SH doesn't have a designated console device. Therefore we "alias" |
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5 | * another device as /dev/console and revector all calls to /dev/console |
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6 | * to this device. |
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7 | * |
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8 | * This approach is similar to installing a sym-link from one device to |
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9 | * another device. If rtems once will support sym-links for devices files, |
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10 | * this implementation could be dropped. |
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11 | */ |
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12 | |
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13 | /* |
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14 | * Author: Ralf Corsepius (corsepiu@faw.uni-ulm.de) |
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15 | * |
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16 | * COPYRIGHT (c) 1997-1998, FAW Ulm, Germany |
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17 | * |
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18 | * This program is distributed in the hope that it will be useful, |
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19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
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21 | * |
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22 | * |
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23 | * COPYRIGHT (c) 1998. |
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24 | * On-Line Applications Research Corporation (OAR). |
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25 | * |
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26 | * The license and distribution terms for this file may be |
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27 | * found in the file LICENSE in this distribution or at |
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28 | * http://www.rtems.org/license/LICENSE. |
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29 | * |
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30 | * Modified to reflect sh7045 processor: |
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31 | * John M. Mills (jmills@tga.com) |
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32 | * TGA Technologies, Inc. |
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33 | * 100 Pinnacle Way, Suite 140 |
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34 | * Norcross, GA 30071 U.S.A. |
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35 | * |
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36 | * This modified file may be copied and distributed in accordance |
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37 | * the above-referenced license. It is provided for critique and |
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38 | * developmental purposes without any warranty nor representation |
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39 | * by the authors or by TGA Technologies. |
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40 | */ |
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41 | |
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42 | #include <bsp.h> |
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43 | |
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44 | |
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45 | #include <stdlib.h> |
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46 | |
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47 | #include <rtems/libio.h> |
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48 | #include <rtems/iosupp.h> |
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49 | #include <rtems/score/sh_io.h> |
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50 | #include <rtems/score/ispsh7045.h> |
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51 | #include <rtems/score/iosh7045.h> |
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52 | #include <sh/sh7_sci.h> |
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53 | #include <sh/sh7_pfc.h> |
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54 | |
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55 | #include <sh/sci.h> |
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56 | |
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57 | #ifndef STANDALONE_EVB |
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58 | #define STANDALONE_EVB 0 |
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59 | #endif |
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60 | |
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61 | /* |
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62 | * NOTE: Some SH variants have 3 sci devices |
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63 | */ |
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64 | |
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65 | #define SCI_MINOR_DEVICES 2 |
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66 | |
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67 | /* |
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68 | * FIXME: sh7045 register names match Hitachi data book, |
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69 | * but conflict with RTEMS sh7032 usage. |
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70 | */ |
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71 | |
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72 | #define SH_SCI_BASE_0 SCI_SMR0 |
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73 | #define SH_SCI_BASE_1 SCI_SMR1 |
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74 | |
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75 | #define SH_SCI_DEF_COMM_0 CS8, B9600 |
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76 | #define SH_SCI_DEF_COMM_1 CS8, B38400 |
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77 | /* #define SH_SCI_DEF_COMM_1 CS8, B9600 */ |
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78 | |
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79 | struct scidev_t { |
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80 | char * name; |
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81 | uint32_t addr; |
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82 | rtems_device_minor_number minor; |
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83 | unsigned short opened; |
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84 | tcflag_t cflags; |
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85 | speed_t spd; |
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86 | } sci_device[SCI_MINOR_DEVICES] = |
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87 | { |
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88 | { "/dev/sci0", SH_SCI_BASE_0, 0, 0, SH_SCI_DEF_COMM_0 }, |
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89 | { "/dev/sci1", SH_SCI_BASE_1, 1, 0, SH_SCI_DEF_COMM_1 } |
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90 | }; |
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91 | |
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92 | /* local data structures maintain hardware configuration */ |
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93 | #if UNUSED |
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94 | static sci_setup_t sio_param[2]; |
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95 | #endif |
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96 | |
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97 | /* Translate termios' tcflag_t into sci settings */ |
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98 | static int _sci_set_cflags( |
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99 | struct scidev_t *sci_dev, |
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100 | tcflag_t c_cflag, |
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101 | speed_t spd |
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102 | ) |
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103 | { |
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104 | uint8_t smr; |
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105 | uint8_t brr; |
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106 | |
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107 | if ( spd ) |
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108 | { |
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109 | if ( _sci_get_brparms( spd, &smr, &brr ) != 0 ) |
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110 | return -1; |
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111 | } |
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112 | |
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113 | if ( c_cflag & CSIZE ) |
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114 | { |
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115 | if ( c_cflag & CS8 ) |
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116 | smr &= ~SCI_SEVEN_BIT_DATA; |
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117 | else if ( c_cflag & CS7 ) |
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118 | smr |= SCI_SEVEN_BIT_DATA; |
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119 | else |
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120 | return -1; |
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121 | } |
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122 | |
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123 | if ( c_cflag & CSTOPB ) |
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124 | smr |= SCI_STOP_BITS_2; |
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125 | else |
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126 | smr &= ~SCI_STOP_BITS_2; |
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127 | |
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128 | if ( c_cflag & PARENB ) |
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129 | smr |= SCI_PARITY_ON; |
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130 | else |
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131 | smr &= ~SCI_PARITY_ON; |
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132 | |
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133 | if ( c_cflag & PARODD ) |
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134 | smr |= SCI_ODD_PARITY; |
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135 | else |
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136 | smr &= ~SCI_ODD_PARITY; |
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137 | |
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138 | write8( smr, sci_dev->addr + SCI_SMR ); |
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139 | write8( brr, sci_dev->addr + SCI_BRR ); |
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140 | |
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141 | return 0; |
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142 | } |
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143 | |
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144 | /* |
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145 | * local functions operate SCI ports 0 and 1 |
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146 | * called from polling routines or ISRs |
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147 | */ |
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148 | static bool wrtSCI0(unsigned char ch) |
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149 | { |
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150 | uint8_t temp; |
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151 | bool result = false; |
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152 | |
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153 | if ((read8(SCI_SSR0) & SCI_TDRE) != 0x00) { |
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154 | /* Write the character to the TDR */ |
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155 | write8(ch, SCI_TDR0); |
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156 | /* Clear the TDRE bit */ |
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157 | temp = read8(SCI_SSR0) & ~SCI_TDRE; |
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158 | write8(temp, SCI_SSR0); |
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159 | result = true; |
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160 | } |
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161 | return result; |
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162 | } /* wrtSCI0 */ |
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163 | |
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164 | static bool wrtSCI1(unsigned char ch) |
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165 | { |
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166 | uint8_t temp; |
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167 | bool result = false; |
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168 | |
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169 | if ((read8(SCI_SSR1) & SCI_TDRE) != 0x00) { |
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170 | /* Write the character to the TDR */ |
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171 | write8(ch, SCI_TDR1); |
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172 | /* Clear the TDRE bit */ |
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173 | temp = read8(SCI_SSR1) & ~SCI_TDRE; |
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174 | write8(temp, SCI_SSR1); |
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175 | result = true; |
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176 | } |
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177 | return result; |
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178 | } /* wrtSCI1 */ |
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179 | |
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180 | /* polled output steers byte to selected port */ |
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181 | static void sh_sci_outbyte_polled( |
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182 | rtems_device_minor_number minor, |
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183 | char ch ) |
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184 | { |
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185 | if (minor == 0) /* blocks until port ready */ |
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186 | while (wrtSCI0(ch) != true); /* SCI0*/ |
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187 | else |
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188 | while (wrtSCI1(ch) != true); /* SCI1*/ |
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189 | } /* sh_sci_outbyte_polled */ |
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190 | |
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191 | /* |
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192 | * Initial version calls polled output driver and blocks |
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193 | */ |
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194 | static void outbyte( |
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195 | rtems_device_minor_number minor, |
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196 | char ch) |
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197 | { |
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198 | sh_sci_outbyte_polled(minor, (unsigned char)ch); |
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199 | } /* outbyte */ |
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200 | |
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201 | static bool rdSCI0(unsigned char *ch) |
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202 | { |
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203 | uint8_t temp; |
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204 | bool result = false; |
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205 | |
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206 | if ((read8(SCI_SSR0) & SCI_RDRF) != 0x00) { |
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207 | /* read input */ |
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208 | *ch = read8(SCI_RDR0); |
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209 | /* Clear RDRF flag */ |
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210 | temp = read8(SCI_SSR0) & ~SCI_RDRF; |
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211 | write8(temp, SCI_SSR0); |
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212 | /* Check for transmission errors */ |
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213 | if (temp & (SCI_ORER | SCI_FER | SCI_PER)) { |
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214 | /* TODO: report to RTEMS transmission error */ |
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215 | |
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216 | /* clear error flags*/ |
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217 | temp &= ~(SCI_ORER | SCI_FER | SCI_PER); |
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218 | write8(temp, SCI_SSR0); |
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219 | } |
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220 | result = true; |
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221 | } |
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222 | return result; |
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223 | } /* rdSCI0 */ |
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224 | |
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225 | static bool rdSCI1(unsigned char *ch) |
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226 | { |
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227 | uint8_t temp; |
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228 | bool result = false; |
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229 | |
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230 | if ((read8(SCI_SSR1) & SCI_RDRF) != 0x00) { |
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231 | /* read input */ |
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232 | *ch = read8(SCI_RDR1); |
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233 | /* Clear RDRF flag */ |
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234 | temp= read8(SCI_SSR1) & ~SCI_RDRF; |
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235 | write8(temp, SCI_SSR1); |
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236 | /* Check for transmission errors */ |
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237 | if (temp & (SCI_ORER | SCI_FER | SCI_PER)) { |
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238 | /* TODO: report to RTEMS transmission error */ |
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239 | |
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240 | /* clear error flags*/ |
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241 | temp &= ~(SCI_ORER | SCI_FER | SCI_PER); |
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242 | write8(temp, SCI_SSR1); |
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243 | } |
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244 | result = true; |
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245 | } |
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246 | return result; |
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247 | } /* rdSCI1 */ |
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248 | |
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249 | /* initial version pulls byte from selected port */ |
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250 | static char sh_sci_inbyte_polled( rtems_device_minor_number minor ) |
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251 | { |
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252 | uint8_t ch = 0; |
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253 | |
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254 | if (minor == 0) /* blocks until char.ready */ |
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255 | while (rdSCI0(&ch) != true); /* SCI0 */ |
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256 | else |
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257 | while (rdSCI1(&ch) != true); /* SCI1 */ |
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258 | return ch; |
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259 | } /* sh_sci_inbyte_polled */ |
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260 | |
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261 | /* Initial version calls polled input driver */ |
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262 | static char inbyte( rtems_device_minor_number minor ) |
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263 | { |
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264 | char ch; |
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265 | |
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266 | ch = sh_sci_inbyte_polled(minor); |
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267 | return ch; |
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268 | } /* inbyte */ |
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269 | |
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270 | /* sh_sci_initialize |
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271 | * |
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272 | * This routine initializes (registers) the sh_sci IO drivers. |
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273 | * |
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274 | * Input parameters: ignored |
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275 | * |
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276 | * Output parameters: NONE |
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277 | * |
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278 | * Return values: RTEMS_SUCCESSFUL |
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279 | * if all sci[...] register, else calls |
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280 | * rtems_fatal_error_occurred(status) |
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281 | */ |
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282 | rtems_device_driver sh_sci_initialize( |
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283 | rtems_device_major_number major, |
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284 | rtems_device_minor_number minor, |
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285 | void *arg ) |
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286 | { |
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287 | rtems_device_driver status; |
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288 | rtems_device_minor_number i; |
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289 | |
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290 | /* |
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291 | * register all possible devices. |
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292 | * the initialization of the hardware is done by sci_open |
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293 | * |
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294 | * One of devices could be previously registered by console |
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295 | * initialization therefore we check it everytime |
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296 | */ |
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297 | for ( i = 0 ; i < SCI_MINOR_DEVICES ; i++ ) { |
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298 | /* OK. We assume it is not registered yet. */ |
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299 | status = rtems_io_register_name( |
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300 | sci_device[i].name, |
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301 | major, |
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302 | sci_device[i].minor |
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303 | ); |
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304 | if (status != RTEMS_SUCCESSFUL) |
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305 | rtems_fatal_error_occurred(status); |
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306 | } |
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307 | |
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308 | /* non-default hardware setup occurs in sh_sci_open() */ |
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309 | return RTEMS_SUCCESSFUL; |
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310 | } |
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311 | |
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312 | /* |
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313 | * Open entry point |
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314 | * Sets up port and pins for selected sci. |
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315 | */ |
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316 | rtems_device_driver sh_sci_open( |
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317 | rtems_device_major_number major, |
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318 | rtems_device_minor_number minor, |
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319 | void * arg ) |
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320 | { |
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321 | uint8_t temp8; |
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322 | uint16_t temp16; |
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323 | |
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324 | unsigned a; |
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325 | |
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326 | /* check for valid minor number */ |
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327 | if (( minor > ( SCI_MINOR_DEVICES -1 )) || ( minor < 0 )) { |
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328 | return RTEMS_INVALID_NUMBER; |
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329 | } |
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330 | |
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331 | /* device already opened */ |
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332 | if ( sci_device[minor].opened > 0 ) { |
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333 | sci_device[minor].opened++; |
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334 | return RTEMS_SUCCESSFUL; |
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335 | } |
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336 | |
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337 | /* set PFC registers to enable I/O pins */ |
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338 | |
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339 | if ((minor == 0)) { |
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340 | temp16 = read16(PFC_PACRL2); /* disable SCK0, DMA, IRQ */ |
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341 | temp16 &= ~(PA2MD1 | PA2MD0); |
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342 | temp16 |= (PA_TXD0 | PA_RXD0); /* enable pins for Tx0, Rx0 */ |
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343 | write16(temp16, PFC_PACRL2); |
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344 | |
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345 | } else if (minor == 1) { |
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346 | temp16 = read16(PFC_PACRL2); /* disable SCK1, DMA, IRQ */ |
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347 | temp16 &= ~(PA5MD1 | PA5MD0); |
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348 | temp16 |= (PA_TXD1 | PA_RXD1); /* enable pins for Tx1, Rx1 */ |
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349 | write16(temp16, PFC_PACRL2); |
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350 | |
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351 | } /* add other devices and pins as req'd. */ |
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352 | |
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353 | /* set up SCI registers */ |
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354 | write8(0x00, sci_device[minor].addr + SCI_SCR); /* Clear SCR */ |
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355 | /* set SMR and BRR */ |
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356 | _sci_set_cflags( &sci_device[minor], sci_device[minor].cflags, sci_device[minor].spd ); |
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357 | |
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358 | for (a=0; a < 10000L; a++) { /* Delay */ |
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359 | __asm__ volatile ("nop"); |
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360 | } |
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361 | |
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362 | write8((SCI_RE | SCI_TE), /* enable async. Tx and Rx */ |
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363 | sci_device[minor].addr + SCI_SCR); |
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364 | |
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365 | /* clear error flags */ |
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366 | temp8 = read8(sci_device[minor].addr + SCI_SSR); |
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367 | while (temp8 & (SCI_RDRF | SCI_ORER | SCI_FER | SCI_PER)) { |
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368 | temp8 = read8(sci_device[minor].addr + SCI_RDR); /* flush input */ |
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369 | temp8 = read8(sci_device[minor].addr + SCI_SSR); /* clear some flags */ |
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370 | write8(temp8 & ~(SCI_RDRF | SCI_ORER | SCI_FER | SCI_PER), |
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371 | sci_device[minor].addr + SCI_SSR); |
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372 | temp8 = read8(sci_device[minor].addr + SCI_SSR); /* check if everything is OK */ |
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373 | } |
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374 | /* Clear RDRF flag */ |
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375 | write8(0x00, sci_device[minor].addr + SCI_TDR); /* force output */ |
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376 | /* Clear the TDRE bit */ |
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377 | temp8 = read8(sci_device[minor].addr + SCI_SSR) & ~SCI_TDRE; |
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378 | write8(temp8, sci_device[minor].addr + SCI_SSR); |
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379 | |
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380 | /* add interrupt setup if required */ |
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381 | |
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382 | |
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383 | sci_device[minor].opened++; |
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384 | |
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385 | return RTEMS_SUCCESSFUL; |
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386 | } |
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387 | |
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388 | /* |
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389 | * Close entry point |
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390 | */ |
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391 | rtems_device_driver sh_sci_close( |
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392 | rtems_device_major_number major, |
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393 | rtems_device_minor_number minor, |
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394 | void * arg |
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395 | ) |
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396 | { |
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397 | /* FIXME: Incomplete */ |
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398 | if ( sci_device[minor].opened > 0 ) |
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399 | sci_device[minor].opened--; |
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400 | else |
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401 | return RTEMS_INVALID_NUMBER; |
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402 | |
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403 | return RTEMS_SUCCESSFUL; |
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404 | } |
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405 | |
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406 | /* |
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407 | * read bytes from the serial port. We only have stdin. |
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408 | */ |
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409 | rtems_device_driver sh_sci_read( |
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410 | rtems_device_major_number major, |
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411 | rtems_device_minor_number minor, |
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412 | void * arg |
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413 | ) |
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414 | { |
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415 | rtems_libio_rw_args_t *rw_args; |
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416 | char *buffer; |
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417 | int maximum; |
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418 | int count = 0; |
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419 | |
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420 | rw_args = (rtems_libio_rw_args_t *) arg; |
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421 | |
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422 | buffer = rw_args->buffer; |
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423 | maximum = rw_args->count; |
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424 | |
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425 | for (count = 0; count < maximum; count++) { |
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426 | buffer[ count ] = inbyte(minor); |
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427 | if (buffer[ count ] == '\n' || buffer[ count ] == '\r') { |
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428 | buffer[ count++ ] = '\n'; |
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429 | break; |
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430 | } |
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431 | } |
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432 | |
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433 | rw_args->bytes_moved = count; |
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434 | return (count >= 0) ? RTEMS_SUCCESSFUL : RTEMS_UNSATISFIED; |
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435 | } |
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436 | |
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437 | /* |
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438 | * write bytes to the serial port. Stdout and stderr are the same. |
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439 | */ |
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440 | rtems_device_driver sh_sci_write( |
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441 | rtems_device_major_number major, |
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442 | rtems_device_minor_number minor, |
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443 | void * arg |
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444 | ) |
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445 | { |
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446 | int count; |
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447 | int maximum; |
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448 | rtems_libio_rw_args_t *rw_args; |
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449 | char *buffer; |
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450 | |
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451 | rw_args = (rtems_libio_rw_args_t *) arg; |
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452 | |
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453 | buffer = rw_args->buffer; |
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454 | maximum = rw_args->count; |
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455 | |
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456 | for (count = 0; count < maximum; count++) { |
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457 | if ( buffer[ count ] == '\n') { |
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458 | outbyte(minor, '\r'); |
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459 | } |
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460 | outbyte( minor, buffer[ count ] ); |
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461 | } |
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462 | |
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463 | rw_args->bytes_moved = maximum; |
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464 | return 0; |
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465 | } |
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466 | |
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467 | /* |
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468 | * IO Control entry point |
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469 | */ |
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470 | rtems_device_driver sh_sci_control( |
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471 | rtems_device_major_number major, |
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472 | rtems_device_minor_number minor, |
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473 | void * arg |
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474 | ) |
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475 | { |
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476 | /* Not yet supported */ |
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477 | return RTEMS_SUCCESSFUL; |
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478 | } |
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479 | |
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480 | /* |
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481 | * Termios polled first open |
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482 | */ |
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483 | static int _sh_sci_poll_first_open(int major, int minor, void *arg) |
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484 | { |
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485 | return sh_sci_open(major, minor, arg); |
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486 | } |
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487 | |
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488 | /* |
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489 | * Termios general last close |
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490 | */ |
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491 | static int _sh_sci_last_close(int major, int minor, void *arg) |
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492 | { |
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493 | return sh_sci_close(major, minor, arg); |
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494 | } |
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495 | |
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496 | /* |
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497 | * Termios polled read |
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498 | */ |
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499 | static int _sh_sci_poll_read(int minor) |
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500 | { |
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501 | int value = -1; |
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502 | uint8_t ch = 0; |
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503 | |
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504 | if ( minor == 0 ) { |
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505 | if ( rdSCI0( &ch ) ) |
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506 | value = (int) ch; |
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507 | } else if ( minor == 1 ) { |
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508 | if ( rdSCI1( &ch ) ) |
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509 | value = (int) ch; |
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510 | } |
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511 | return value; |
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512 | } |
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513 | |
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514 | /* |
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515 | * Termios polled write |
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516 | */ |
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517 | static ssize_t _sh_sci_poll_write(int minor, const char *buf, size_t len) |
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518 | { |
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519 | size_t count; |
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520 | |
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521 | for (count = 0; count < len; count++) |
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522 | outbyte( minor, buf[count] ); |
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523 | return count; |
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524 | } |
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525 | |
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526 | /* |
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527 | * Termios set attributes |
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528 | */ |
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529 | static int _sh_sci_set_attributes( int minor, const struct termios *t) |
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530 | { |
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531 | return _sci_set_cflags( &sci_device[ minor ], t->c_cflag, t->c_ospeed); |
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532 | } |
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533 | |
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534 | |
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535 | const rtems_termios_callbacks sci_poll_callbacks = { |
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536 | _sh_sci_poll_first_open, /* FirstOpen*/ |
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537 | _sh_sci_last_close, /* LastClose*/ |
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538 | _sh_sci_poll_read, /* PollRead */ |
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539 | _sh_sci_poll_write, /* Write */ |
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540 | _sh_sci_set_attributes, /* setAttributes */ |
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541 | NULL, /* stopRemoteTX */ |
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542 | NULL, /* StartRemoteTX */ |
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543 | 0 /* outputUsesInterrupts */ |
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544 | }; |
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545 | |
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546 | /* FIXME: not yet supported */ |
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547 | const rtems_termios_callbacks sci_interrupt_callbacks; |
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548 | |
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549 | const rtems_termios_callbacks* sh_sci_get_termios_handlers( bool poll ) |
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550 | { |
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551 | return poll ? |
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552 | &sci_poll_callbacks : |
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553 | &sci_interrupt_callbacks; |
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554 | } |
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