1 | /* mbed Microcontroller Library
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2 | * Copyright (c) 2006-2015 ARM Limited
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3 | *
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4 | * Licensed under the Apache License, Version 2.0 (the "License");
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5 | * you may not use this file except in compliance with the License.
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6 | * You may obtain a copy of the License at
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7 | *
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8 | * http://www.apache.org/licenses/LICENSE-2.0
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9 | *
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10 | * Unless required by applicable law or agreed to in writing, software
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11 | * distributed under the License is distributed on an "AS IS" BASIS,
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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13 | * See the License for the specific language governing permissions and
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14 | * limitations under the License.
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15 | */
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16 | #ifndef MBED_I2C_API_H
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17 | #define MBED_I2C_API_H
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18 |
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19 | #include "device.h"
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20 | #include "buffer.h"
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21 |
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22 | #if DEVICE_I2C
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23 |
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24 | /**
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25 | * @defgroup I2CEvents I2C Events Macros
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26 | *
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27 | * @{
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28 | */
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29 | #define I2C_EVENT_ERROR (1 << 1)
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30 | #define I2C_EVENT_ERROR_NO_SLAVE (1 << 2)
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31 | #define I2C_EVENT_TRANSFER_COMPLETE (1 << 3)
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32 | #define I2C_EVENT_TRANSFER_EARLY_NACK (1 << 4)
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33 | #define I2C_EVENT_ALL (I2C_EVENT_ERROR | I2C_EVENT_TRANSFER_COMPLETE | I2C_EVENT_ERROR_NO_SLAVE | I2C_EVENT_TRANSFER_EARLY_NACK)
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34 |
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35 | /**@}*/
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36 |
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37 | #if DEVICE_I2C_ASYNCH
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38 | /** Asynch i2c hal structure
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39 | */
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40 | typedef struct {
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41 | struct i2c_s i2c; /**< Target specific i2c structure */
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42 | struct buffer_s tx_buff; /**< Tx buffer */
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43 | struct buffer_s rx_buff; /**< Rx buffer */
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44 | } i2c_t;
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45 |
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46 | #else
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47 | /** Non-asynch i2c hal structure
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48 | */
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49 | typedef struct i2c_s i2c_t;
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50 |
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51 | #endif
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52 |
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53 | enum {
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54 | I2C_ERROR_NO_SLAVE = -1,
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55 | I2C_ERROR_BUS_BUSY = -2
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56 | };
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57 |
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58 | #ifdef __cplusplus
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59 | extern "C" {
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60 | #endif
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61 |
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62 | /**
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63 | * \defgroup GeneralI2C I2C Configuration Functions
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64 | * @{
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65 | */
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66 |
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67 | /** Initialize the I2C peripheral. It sets the default parameters for I2C
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68 | * peripheral, and configure its specifieds pins.
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69 | * @param obj The i2c object
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70 | * @param sda The sda pin
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71 | * @param scl The scl pin
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72 | */
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73 | void i2c_init(i2c_t *obj, PinName sda, PinName scl);
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74 |
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75 | /** Configure the I2C frequency.
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76 | * @param obj The i2c object
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77 | * @param hz Frequency in Hz
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78 | */
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79 | void i2c_frequency(i2c_t *obj, int hz);
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80 |
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81 | /** Send START command.
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82 | * @param obj The i2c object
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83 | */
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84 | int i2c_start(i2c_t *obj);
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85 |
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86 | /** Send STOP command.
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87 | * @param obj The i2c object
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88 | */
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89 | int i2c_stop(i2c_t *obj);
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90 |
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91 | /** Blocking reading data.
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92 | * @param obj The i2c object
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93 | * @param address 7-bit address (last bit is 1)
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94 | * @param data The buffer for receiving
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95 | * @param length Number of bytes to read
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96 | * @param stop Stop to be generated after the transfer is done
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97 | * @return Number of read bytes
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98 | */
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99 | int i2c_read(i2c_t *obj, int address, char *data, int length, int stop);
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100 |
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101 | /** Blocking sending data.
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102 | * @param obj The i2c object
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103 | * @param address 7-bit address (last bit is 0)
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104 | * @param data The buffer for sending
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105 | * @param length Number of bytes to wrte
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106 | * @param stop Stop to be generated after the transfer is done
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107 | * @return Number of written bytes
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108 | */
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109 | int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop);
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110 |
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111 | /** Reset I2C peripheral. TODO: The action here. Most of the implementation sends stop().
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112 | * @param obj The i2c object
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113 | */
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114 | void i2c_reset(i2c_t *obj);
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115 |
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116 | /** Read one byte.
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117 | * @param obj The i2c object
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118 | * @param last Acknoledge
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119 | * @return The read byte
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120 | */
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121 | int i2c_byte_read(i2c_t *obj, int last);
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122 |
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123 | /** Write one byte.
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124 | * @param obj The i2c object
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125 | * @param data Byte to be written
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126 | * @return 1 if NAK was received, 0 if ACK was received, 2 for timeout.
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127 | */
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128 | int i2c_byte_write(i2c_t *obj, int data);
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129 |
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130 | /**@}*/
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131 |
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132 | #if DEVICE_I2CSLAVE
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133 |
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134 | /**
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135 | * \defgroup SynchI2C Synchronous I2C Hardware Abstraction Layer for slave
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136 | * @{
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137 | */
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138 |
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139 | /** Configure I2C as slave or master.
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140 | * @param obj The I2C object
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141 | * @return non-zero if a value is available
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142 | */
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143 | void i2c_slave_mode(i2c_t *obj, int enable_slave);
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144 |
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145 | /** Check to see if the I2C slave has been addressed.
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146 | * @param obj The I2C object
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147 | * @return The status - 1 - read addresses, 2 - write to all slaves,
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148 | * 3 write addressed, 0 - the slave has not been addressed
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149 | */
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150 | int i2c_slave_receive(i2c_t *obj);
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151 |
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152 | /** Configure I2C as slave or master.
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153 | * @param obj The I2C object
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154 | * @return non-zero if a value is available
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155 | */
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156 | int i2c_slave_read(i2c_t *obj, char *data, int length);
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157 |
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158 | /** Configure I2C as slave or master.
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159 | * @param obj The I2C object
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160 | * @return non-zero if a value is available
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161 | */
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162 | int i2c_slave_write(i2c_t *obj, const char *data, int length);
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163 |
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164 | /** Configure I2C address.
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165 | * @param obj The I2C object
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166 | * @param idx Currently not used
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167 | * @param address The address to be set
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168 | * @param mask Currently not used
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169 | */
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170 | void i2c_slave_address(i2c_t *obj, int idx, uint32_t address, uint32_t mask);
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171 |
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172 | #endif
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173 |
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174 | /**@}*/
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175 |
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176 | #if DEVICE_I2C_ASYNCH
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177 |
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178 | /**
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179 | * \defgroup AsynchI2C Asynchronous I2C Hardware Abstraction Layer
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180 | * @{
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181 | */
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182 |
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183 | /** Start i2c asynchronous transfer.
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184 | * @param obj The I2C object
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185 | * @param tx The buffer to send
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186 | * @param tx_length The number of words to transmit
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187 | * @param rx The buffer to receive
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188 | * @param rx_length The number of words to receive
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189 | * @param address The address to be set - 7bit or 9 bit
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190 | * @param stop If true, stop will be generated after the transfer is done
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191 | * @param handler The I2C IRQ handler to be set
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192 | * @param hint DMA hint usage
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193 | */
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194 | void i2c_transfer_asynch(i2c_t *obj, const void *tx, size_t tx_length, void *rx, size_t rx_length, uint32_t address, uint32_t stop, uint32_t handler, uint32_t event, DMAUsage hint);
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195 |
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196 | /** The asynchronous IRQ handler
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197 | * @param obj The I2C object which holds the transfer information
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198 | * @return event flags if a transfer termination condition was met or 0 otherwise.
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199 | */
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200 | uint32_t i2c_irq_handler_asynch(i2c_t *obj);
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201 |
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202 | /** Attempts to determine if I2C peripheral is already in use.
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203 | * @param obj The I2C object
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204 | * @return non-zero if the I2C module is active or zero if it is not
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205 | */
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206 | uint8_t i2c_active(i2c_t *obj);
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207 |
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208 | /** Abort ongoing asynchronous transaction.
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209 | * @param obj The I2C object
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210 | */
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211 | void i2c_abort_asynch(i2c_t *obj);
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212 |
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213 | #endif
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214 |
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215 | /**@}*/
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216 |
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217 | #ifdef __cplusplus
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218 | }
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219 | #endif
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220 |
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221 | #endif
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222 |
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223 | #endif
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