1 | /** |
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2 | * @file can.h |
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3 | * |
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4 | * @ingroup lpc176x |
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5 | * |
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6 | * @brief CAN controller for the mbed lpc1768 board. |
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7 | */ |
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8 | |
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9 | /* |
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10 | * Copyright (c) 2014 Taller Technologies. |
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11 | * |
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12 | * @author Diaz Marcos (marcos.diaz@tallertechnologies.com) |
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13 | * @author Daniel Chicco (daniel.chicco@tallertechnologies.com) |
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14 | * |
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15 | * The license and distribution terms for this file may be |
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16 | * found in the file LICENSE in this distribution or at |
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17 | * http://www.rtems.org/license/LICENSE. |
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18 | */ |
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19 | |
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20 | #ifndef LPC176X_CAN_H |
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21 | #define LPC176X_CAN_H |
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22 | |
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23 | #include <bsp.h> |
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24 | #include <bsp/io.h> |
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25 | #include <bsp/lpc176x.h> |
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26 | |
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27 | #ifdef __cplusplus |
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28 | extern "C" { |
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29 | #endif /* __cplusplus */ |
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30 | |
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31 | /** |
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32 | * @brief The CAN devices of the board. |
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33 | */ |
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34 | typedef enum { |
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35 | CAN_0, |
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36 | CAN_1, |
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37 | CAN_DEVICES_NUMBER |
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38 | } lpc176x_can_number; |
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39 | |
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40 | /** |
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41 | * @brief A CAN message represented for the registers of the device. |
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42 | */ |
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43 | typedef struct { |
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44 | uint32_t info; |
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45 | uint32_t id; |
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46 | uint32_t data_a; |
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47 | uint32_t data_b; |
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48 | } registers_can_message; |
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49 | |
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50 | /** |
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51 | * @brief A CAN message represented with each logical parts |
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52 | */ |
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53 | typedef struct { |
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54 | unsigned int reserved1 : 16; |
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55 | unsigned int dlc : 4; /* Bits 16..19: DLC - Data Length Counter*/ |
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56 | unsigned int reserved0 : 10; |
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57 | unsigned int rtr : 1; /* Bit 30: Set if this is a RTR message*/ |
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58 | unsigned int type : 1; /* Bit 31: Set if this is a 29-bit ID message*/ |
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59 | unsigned int id; /* CAN Message ID (11-bit or 29-bit)*/ |
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60 | unsigned char data[ 8 ]; /* CAN Message Data Bytes 0-7*/ |
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61 | } low_level_can_message; |
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62 | |
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63 | /** |
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64 | * @brief A CAN message represented of both forms. |
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65 | */ |
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66 | typedef union { |
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67 | low_level_can_message low_level; |
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68 | registers_can_message registers; |
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69 | } can_message; |
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70 | |
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71 | /** |
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72 | * @brief The possible interrupt sources for CAN. |
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73 | */ |
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74 | typedef enum { |
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75 | IRQ_RX = 0, |
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76 | IRQ_TX, |
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77 | IRQ_ERROR, |
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78 | IRQ_OVERRUN, |
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79 | IRQ_WAKEUP, |
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80 | IRQ_PASSIVE, |
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81 | IRQ_ARB, |
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82 | IRQ_BUS, |
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83 | IRQ_READY, |
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84 | CAN_IRQ_NUMBER |
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85 | } can_irq_type; |
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86 | |
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87 | /** |
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88 | * @brief An isr for a CAN interrupt |
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89 | * |
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90 | * @param number The CAN which rised the interrupt. |
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91 | */ |
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92 | typedef void (*lpc176x_can_isr) ( lpc176x_can_number number ); |
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93 | |
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94 | /** |
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95 | * @brief A CAN frequency value |
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96 | */ |
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97 | typedef unsigned int can_freq; |
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98 | |
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99 | /** |
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100 | * @brief Opens CAN device. |
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101 | * @details It enables the module and gives it a clock, sets the pins, |
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102 | * disables the interrupts, sets the frequency and bypasses |
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103 | * the acceptance filter. |
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104 | * |
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105 | * @param minor The device to open. |
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106 | * @param freq The desired frequency. |
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107 | * @return RTEMS_SUCCESFUL on success. |
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108 | */ |
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109 | rtems_status_code can_open( lpc176x_can_number minor, can_freq freq ); |
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110 | |
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111 | /** |
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112 | * @brief Closes the passed CAN device and shut it down. |
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113 | * |
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114 | * @param minor The device to close. |
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115 | * @return RTEMS_SUCCESSFUL if ok, RTEMS_INVALID_NUMBER for a bad parameter. |
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116 | */ |
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117 | rtems_status_code can_close( lpc176x_can_number minor ); |
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118 | |
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119 | /** |
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120 | * @brief Reads the CAN device. |
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121 | * |
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122 | * @param minor The CAN device to read. |
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123 | * @param message The read message. |
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124 | * @return RTEMS_SUCCESSFUL if read ok, RTEMS_IO_ERROR otherwise. |
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125 | */ |
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126 | rtems_status_code can_read( |
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127 | const lpc176x_can_number minor, |
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128 | can_message *message |
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129 | ); |
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130 | |
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131 | /** |
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132 | * @brief Writes the passed CAN message into the selected CAN device. |
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133 | * |
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134 | * @param minor The device to write. |
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135 | * @param message The message to write. |
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136 | * @return RTEMS_SUCCESFUL if write ok. RTEMS_IO_ERROR otherwise. |
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137 | */ |
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138 | rtems_status_code can_write( |
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139 | const lpc176x_can_number minor, |
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140 | const can_message *const message |
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141 | ); |
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142 | |
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143 | /** |
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144 | * @brief Registers an isr in the driver vector, and enables the interrupt |
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145 | * in the device. |
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146 | * |
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147 | * @param number The CAN device to set |
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148 | * @param type The interrupt type. |
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149 | * @param isr The isr to register. |
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150 | * @return RTEMS_SUCCESSFUL if ok RTEMS_INVALID_NUMBER otherwise. |
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151 | */ |
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152 | rtems_status_code can_register_isr( |
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153 | const lpc176x_can_number number, |
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154 | const can_irq_type type, |
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155 | const lpc176x_can_isr isr |
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156 | ); |
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157 | |
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158 | /** |
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159 | * @brief Creates a CAN message. |
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160 | * @details [long description] |
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161 | * |
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162 | * @param msg The created message. |
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163 | * @param _id The can id for the message. |
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164 | * @param _data The data of the message. |
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165 | * @param _len The length of the message. |
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166 | * @return RTEMS_SUCCESFUL if created, RTEMS_INVALID_NUMBER otherwise. |
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167 | */ |
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168 | rtems_status_code create_can_message( |
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169 | can_message *const msg, |
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170 | const int _id, |
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171 | const char *const _data, |
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172 | const char _len |
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173 | ); |
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174 | |
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175 | #ifdef __cplusplus |
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176 | } |
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177 | #endif /* __cplusplus */ |
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178 | |
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179 | #endif /* ifndef LPC176X_CAN_H */ |
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