Sat, 14 Mar 2020 15:52:04 +0100
Added function comment
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Initial import of the CO2 meter application.
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1 | #include <stdio.h> |
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2 | #include <string.h> |
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3 | |
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4 | #include "sdkconfig.h" |
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5 | #include "esp_log.h" |
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6 | |
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7 | #include "freertos/FreeRTOS.h" |
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8 | #include "freertos/task.h" |
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9 | |
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10 | #include "u8g2_esp32_hal.h" |
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11 | |
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12 | static const char *TAG = "u8g2_hal"; |
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13 | static const unsigned int I2C_TIMEOUT_MS = 5000; |
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14 | |
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15 | static spi_device_handle_t handle_spi; // SPI handle. |
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16 | static i2c_cmd_handle_t handle_i2c; // I2C handle. |
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17 | static u8g2_esp32_hal_t u8g2_esp32_hal; // HAL state data. |
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18 | |
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19 | #undef ESP_ERROR_CHECK |
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20 | #define ESP_ERROR_CHECK(x) do { esp_err_t rc = (x); if (rc != ESP_OK) { ESP_LOGE("err", "esp_err_t = %d", rc); assert(0 && #x);} } while(0); |
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21 | |
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22 | /* |
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23 | * Initialze the ESP32 HAL. |
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24 | */ |
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25 | void u8g2_esp32_hal_init(u8g2_esp32_hal_t u8g2_esp32_hal_param) { |
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26 | u8g2_esp32_hal = u8g2_esp32_hal_param; |
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27 | } // u8g2_esp32_hal_init |
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28 | |
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29 | /* |
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30 | * HAL callback function as prescribed by the U8G2 library. This callback is invoked |
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31 | * to handle SPI communications. |
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32 | */ |
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33 | uint8_t u8g2_esp32_spi_byte_cb(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr) { |
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34 | ESP_LOGD(TAG, "spi_byte_cb: Received a msg: %d, arg_int: %d, arg_ptr: %p", msg, arg_int, arg_ptr); |
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35 | switch(msg) { |
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36 | case U8X8_MSG_BYTE_SET_DC: |
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37 | if (u8g2_esp32_hal.dc != U8G2_ESP32_HAL_UNDEFINED) { |
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38 | gpio_set_level(u8g2_esp32_hal.dc, arg_int); |
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39 | } |
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40 | break; |
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41 | |
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42 | case U8X8_MSG_BYTE_INIT: { |
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43 | if (u8g2_esp32_hal.clk == U8G2_ESP32_HAL_UNDEFINED || |
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44 | u8g2_esp32_hal.mosi == U8G2_ESP32_HAL_UNDEFINED || |
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45 | u8g2_esp32_hal.cs == U8G2_ESP32_HAL_UNDEFINED) { |
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46 | break; |
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47 | } |
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48 | |
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49 | spi_bus_config_t bus_config; |
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50 | memset(&bus_config, 0, sizeof(spi_bus_config_t)); |
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51 | bus_config.sclk_io_num = u8g2_esp32_hal.clk; // CLK |
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52 | bus_config.mosi_io_num = u8g2_esp32_hal.mosi; // MOSI |
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53 | bus_config.miso_io_num = -1; // MISO |
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54 | bus_config.quadwp_io_num = -1; // Not used |
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55 | bus_config.quadhd_io_num = -1; // Not used |
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56 | //ESP_LOGI(TAG, "... Initializing bus."); |
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57 | ESP_ERROR_CHECK(spi_bus_initialize(HSPI_HOST, &bus_config, 1)); |
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58 | |
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59 | spi_device_interface_config_t dev_config; |
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60 | dev_config.address_bits = 0; |
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61 | dev_config.command_bits = 0; |
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62 | dev_config.dummy_bits = 0; |
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63 | dev_config.mode = 0; |
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64 | dev_config.duty_cycle_pos = 0; |
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65 | dev_config.cs_ena_posttrans = 0; |
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66 | dev_config.cs_ena_pretrans = 0; |
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67 | dev_config.clock_speed_hz = 10000; |
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68 | dev_config.spics_io_num = u8g2_esp32_hal.cs; |
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69 | dev_config.flags = 0; |
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70 | dev_config.queue_size = 200; |
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71 | dev_config.pre_cb = NULL; |
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72 | dev_config.post_cb = NULL; |
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73 | //ESP_LOGI(TAG, "... Adding device bus."); |
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74 | ESP_ERROR_CHECK(spi_bus_add_device(HSPI_HOST, &dev_config, &handle_spi)); |
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75 | |
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76 | break; |
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77 | } |
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78 | |
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79 | case U8X8_MSG_BYTE_SEND: { |
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80 | spi_transaction_t trans_desc; |
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81 | trans_desc.addr = 0; |
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82 | trans_desc.cmd = 0; |
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83 | trans_desc.flags = 0; |
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84 | trans_desc.length = 8 * arg_int; // Number of bits NOT number of bytes. |
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85 | trans_desc.rxlength = 0; |
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86 | trans_desc.tx_buffer = arg_ptr; |
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87 | trans_desc.rx_buffer = NULL; |
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88 | |
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89 | //ESP_LOGI(TAG, "... Transmitting %d bytes.", arg_int); |
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90 | ESP_ERROR_CHECK(spi_device_transmit(handle_spi, &trans_desc)); |
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91 | break; |
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92 | } |
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93 | } |
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94 | return 0; |
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95 | } // u8g2_esp32_spi_byte_cb |
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96 | |
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97 | /* |
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98 | * HAL callback function as prescribed by the U8G2 library. This callback is invoked |
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99 | * to handle I2C communications. |
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100 | */ |
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101 | uint8_t u8g2_esp32_i2c_byte_cb(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr) { |
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102 | ESP_LOGD(TAG, "i2c_cb: Received a msg: %d, arg_int: %d, arg_ptr: %p", msg, arg_int, arg_ptr); |
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103 | |
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104 | switch(msg) { |
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105 | case U8X8_MSG_BYTE_SET_DC: { |
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106 | if (u8g2_esp32_hal.dc != U8G2_ESP32_HAL_UNDEFINED) { |
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107 | gpio_set_level(u8g2_esp32_hal.dc, arg_int); |
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108 | } |
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109 | break; |
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110 | } |
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111 | |
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112 | case U8X8_MSG_BYTE_INIT: { |
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113 | if (u8g2_esp32_hal.sda == U8G2_ESP32_HAL_UNDEFINED || |
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114 | u8g2_esp32_hal.scl == U8G2_ESP32_HAL_UNDEFINED) { |
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115 | break; |
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116 | } |
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117 | |
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118 | i2c_config_t conf; |
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119 | conf.mode = I2C_MODE_MASTER; |
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120 | conf.sda_io_num = u8g2_esp32_hal.sda; |
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121 | conf.sda_pullup_en = GPIO_PULLUP_ENABLE; |
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122 | conf.scl_io_num = u8g2_esp32_hal.scl; |
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123 | conf.scl_pullup_en = GPIO_PULLUP_ENABLE; |
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124 | conf.master.clk_speed = I2C_MASTER_FREQ_HZ; |
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125 | ESP_ERROR_CHECK(i2c_param_config(I2C_MASTER_NUM, &conf)); |
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126 | ESP_LOGI(TAG, "I2C gpio_sda: %d gpio_scl: %d clk_speed: %d master_num: %d", |
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127 | u8g2_esp32_hal.sda, u8g2_esp32_hal.scl, I2C_MASTER_FREQ_HZ, I2C_MASTER_NUM); |
0
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128 | ESP_ERROR_CHECK(i2c_driver_install(I2C_MASTER_NUM, conf.mode, I2C_MASTER_RX_BUF_DISABLE, I2C_MASTER_TX_BUF_DISABLE, 0)); |
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129 | break; |
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130 | } |
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131 | |
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132 | case U8X8_MSG_BYTE_SEND: { |
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133 | uint8_t* data_ptr = (uint8_t*)arg_ptr; |
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134 | ESP_LOG_BUFFER_HEXDUMP(TAG, data_ptr, arg_int, ESP_LOG_VERBOSE); |
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135 | |
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136 | while( arg_int > 0 ) { |
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137 | ESP_ERROR_CHECK(i2c_master_write_byte(handle_i2c, *data_ptr, ACK_CHECK_EN)); |
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138 | data_ptr++; |
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139 | arg_int--; |
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140 | } |
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141 | break; |
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142 | } |
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143 | |
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144 | case U8X8_MSG_BYTE_START_TRANSFER: { |
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145 | uint8_t i2c_address = u8x8_GetI2CAddress(u8x8); |
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146 | handle_i2c = i2c_cmd_link_create(); |
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147 | ESP_LOGD(TAG, "Start I2C transfer to %02X.", i2c_address>>1); |
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148 | ESP_ERROR_CHECK(i2c_master_start(handle_i2c)); |
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149 | ESP_ERROR_CHECK(i2c_master_write_byte(handle_i2c, i2c_address | I2C_MASTER_WRITE, ACK_CHECK_EN)); |
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150 | break; |
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151 | } |
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152 | |
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153 | case U8X8_MSG_BYTE_END_TRANSFER: { |
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154 | ESP_LOGD(TAG, "End I2C transfer."); |
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155 | ESP_ERROR_CHECK(i2c_master_stop(handle_i2c)); |
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156 | ESP_ERROR_CHECK(i2c_master_cmd_begin(I2C_MASTER_NUM, handle_i2c, I2C_TIMEOUT_MS / portTICK_RATE_MS)); |
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157 | i2c_cmd_link_delete(handle_i2c); |
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158 | break; |
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159 | } |
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160 | } |
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161 | return 0; |
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162 | } // u8g2_esp32_i2c_byte_cb |
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163 | |
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164 | /* |
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165 | * HAL callback function as prescribed by the U8G2 library. This callback is invoked |
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166 | * to handle callbacks for GPIO and delay functions. |
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167 | */ |
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168 | uint8_t u8g2_esp32_gpio_and_delay_cb(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr) { |
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169 | ESP_LOGD(TAG, "gpio_and_delay_cb: Received a msg: %d, arg_int: %d, arg_ptr: %p", msg, arg_int, arg_ptr); |
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170 | |
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171 | switch(msg) { |
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172 | // Initialize the GPIO and DELAY HAL functions. If the pins for DC and RESET have been |
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173 | // specified then we define those pins as GPIO outputs. |
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174 | case U8X8_MSG_GPIO_AND_DELAY_INIT: { |
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175 | uint64_t bitmask = 0; |
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176 | if (u8g2_esp32_hal.dc != U8G2_ESP32_HAL_UNDEFINED) { |
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177 | bitmask = bitmask | (1ull<<u8g2_esp32_hal.dc); |
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178 | } |
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179 | if (u8g2_esp32_hal.reset != U8G2_ESP32_HAL_UNDEFINED) { |
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180 | bitmask = bitmask | (1ull<<u8g2_esp32_hal.reset); |
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181 | } |
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182 | if (u8g2_esp32_hal.cs != U8G2_ESP32_HAL_UNDEFINED) { |
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183 | bitmask = bitmask | (1ull<<u8g2_esp32_hal.cs); |
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184 | } |
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185 | |
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186 | if (bitmask==0) { |
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187 | break; |
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188 | } |
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189 | gpio_config_t gpioConfig; |
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190 | gpioConfig.pin_bit_mask = bitmask; |
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191 | gpioConfig.mode = GPIO_MODE_OUTPUT; |
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192 | gpioConfig.pull_up_en = GPIO_PULLUP_DISABLE; |
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193 | gpioConfig.pull_down_en = GPIO_PULLDOWN_ENABLE; |
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194 | gpioConfig.intr_type = GPIO_INTR_DISABLE; |
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195 | gpio_config(&gpioConfig); |
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196 | break; |
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197 | } |
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198 | |
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199 | // Set the GPIO reset pin to the value passed in through arg_int. |
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200 | case U8X8_MSG_GPIO_RESET: |
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201 | if (u8g2_esp32_hal.reset != U8G2_ESP32_HAL_UNDEFINED) { |
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202 | gpio_set_level(u8g2_esp32_hal.reset, arg_int); |
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203 | } |
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204 | break; |
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205 | // Set the GPIO client select pin to the value passed in through arg_int. |
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206 | case U8X8_MSG_GPIO_CS: |
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207 | if (u8g2_esp32_hal.cs != U8G2_ESP32_HAL_UNDEFINED) { |
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208 | gpio_set_level(u8g2_esp32_hal.cs, arg_int); |
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209 | } |
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210 | break; |
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211 | // Set the Software I²C pin to the value passed in through arg_int. |
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212 | case U8X8_MSG_GPIO_I2C_CLOCK: |
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213 | if (u8g2_esp32_hal.scl != U8G2_ESP32_HAL_UNDEFINED) { |
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214 | gpio_set_level(u8g2_esp32_hal.scl, arg_int); |
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215 | // printf("%c",(arg_int==1?'C':'c')); |
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216 | } |
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217 | break; |
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218 | // Set the Software I²C pin to the value passed in through arg_int. |
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219 | case U8X8_MSG_GPIO_I2C_DATA: |
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220 | if (u8g2_esp32_hal.sda != U8G2_ESP32_HAL_UNDEFINED) { |
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221 | gpio_set_level(u8g2_esp32_hal.sda, arg_int); |
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222 | // printf("%c",(arg_int==1?'D':'d')); |
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223 | } |
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224 | break; |
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225 | |
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226 | // Delay for the number of milliseconds passed in through arg_int. |
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227 | case U8X8_MSG_DELAY_MILLI: |
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228 | vTaskDelay(arg_int/portTICK_PERIOD_MS); |
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229 | break; |
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230 | } |
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231 | return 0; |
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232 | } // u8g2_esp32_gpio_and_delay_cb |