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- #include <stdio.h>
- #include <string.h>
-
- #include "sdkconfig.h"
- #include "esp_log.h"
-
- #include "freertos/FreeRTOS.h"
- #include "freertos/task.h"
-
- #include "u8g2_esp32_hal.h"
-
- static const char *TAG = "u8g2_hal";
- static const unsigned int I2C_TIMEOUT_MS = 1000;
-
- static i2c_cmd_handle_t handle_i2c; // I2C handle.
- static u8g2_esp32_hal_t u8g2_esp32_hal; // HAL state data.
-
- #undef ESP_ERROR_CHECK
- #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);
-
- /*
- * Initialze the ESP32 HAL.
- */
- void u8g2_esp32_hal_init(u8g2_esp32_hal_t u8g2_esp32_hal_param) {
- u8g2_esp32_hal = u8g2_esp32_hal_param;
- } // u8g2_esp32_hal_init
-
- /*
- * HAL callback function as prescribed by the U8G2 library. This callback is invoked
- * to handle I2C communications.
- */
- uint8_t u8g2_esp32_i2c_byte_cb(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr) {
- //ESP_LOGD(TAG, "i2c_cb: Received a msg: %d, arg_int: %d, arg_ptr: %p", msg, arg_int, arg_ptr);
-
- switch(msg) {
- case U8X8_MSG_BYTE_SET_DC: {
- if (u8g2_esp32_hal.dc != U8G2_ESP32_HAL_UNDEFINED) {
- gpio_set_level(u8g2_esp32_hal.dc, arg_int);
- }
- break;
- }
-
- case U8X8_MSG_BYTE_INIT: {
- if (u8g2_esp32_hal.sda == U8G2_ESP32_HAL_UNDEFINED ||
- u8g2_esp32_hal.scl == U8G2_ESP32_HAL_UNDEFINED) {
- break;
- }
-
- i2c_config_t conf;
- conf.mode = I2C_MODE_MASTER;
- ESP_LOGI(TAG, "sda_io_num %d", u8g2_esp32_hal.sda);
- conf.sda_io_num = u8g2_esp32_hal.sda;
- conf.sda_pullup_en = GPIO_PULLUP_ENABLE;
- ESP_LOGI(TAG, "scl_io_num %d", u8g2_esp32_hal.scl);
- conf.scl_io_num = u8g2_esp32_hal.scl;
- conf.scl_pullup_en = GPIO_PULLUP_ENABLE;
- ESP_LOGI(TAG, "clk_speed %d", I2C_MASTER_FREQ_HZ);
- conf.master.clk_speed = I2C_MASTER_FREQ_HZ;
- ESP_LOGI(TAG, "i2c_param_config %d", conf.mode);
- ESP_ERROR_CHECK(i2c_param_config(I2C_MASTER_NUM, &conf));
- ESP_LOGI(TAG, "i2c_driver_install %d", I2C_MASTER_NUM);
- ESP_ERROR_CHECK(i2c_driver_install(I2C_MASTER_NUM, conf.mode, I2C_MASTER_RX_BUF_DISABLE, I2C_MASTER_TX_BUF_DISABLE, 0));
- break;
- }
-
- case U8X8_MSG_BYTE_SEND: {
- uint8_t* data_ptr = (uint8_t*)arg_ptr;
- ESP_LOG_BUFFER_HEXDUMP(TAG, data_ptr, arg_int, ESP_LOG_VERBOSE);
-
- while( arg_int > 0 ) {
- ESP_ERROR_CHECK(i2c_master_write_byte(handle_i2c, *data_ptr, ACK_CHECK_EN));
- data_ptr++;
- arg_int--;
- }
- break;
- }
-
- case U8X8_MSG_BYTE_START_TRANSFER: {
- uint8_t i2c_address = u8x8_GetI2CAddress(u8x8);
- handle_i2c = i2c_cmd_link_create();
- ESP_LOGD(TAG, "Start I2C transfer to %02X.", i2c_address>>1);
- ESP_ERROR_CHECK(i2c_master_start(handle_i2c));
- ESP_ERROR_CHECK(i2c_master_write_byte(handle_i2c, i2c_address | I2C_MASTER_WRITE, ACK_CHECK_EN));
- break;
- }
-
- case U8X8_MSG_BYTE_END_TRANSFER: {
- ESP_LOGD(TAG, "End I2C transfer.");
- ESP_ERROR_CHECK(i2c_master_stop(handle_i2c));
- ESP_ERROR_CHECK(i2c_master_cmd_begin(I2C_MASTER_NUM, handle_i2c, I2C_TIMEOUT_MS / portTICK_RATE_MS));
- i2c_cmd_link_delete(handle_i2c);
- break;
- }
- }
- return 0;
- } // u8g2_esp32_i2c_byte_cb
-
- /*
- * HAL callback function as prescribed by the U8G2 library. This callback is invoked
- * to handle callbacks for GPIO and delay functions.
- */
- uint8_t u8g2_esp32_gpio_and_delay_cb(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr) {
- ESP_LOGD(TAG, "gpio_and_delay_cb: Received a msg: %d, arg_int: %d, arg_ptr: %p", msg, arg_int, arg_ptr);
-
- switch(msg) {
- // Initialize the GPIO and DELAY HAL functions. If the pins for DC and RESET have been
- // specified then we define those pins as GPIO outputs.
- case U8X8_MSG_GPIO_AND_DELAY_INIT: {
- uint64_t bitmask = 0;
- if (u8g2_esp32_hal.dc != U8G2_ESP32_HAL_UNDEFINED) {
- bitmask = bitmask | (1ull<<u8g2_esp32_hal.dc);
- }
- if (u8g2_esp32_hal.reset != U8G2_ESP32_HAL_UNDEFINED) {
- bitmask = bitmask | (1ull<<u8g2_esp32_hal.reset);
- }
- if (u8g2_esp32_hal.cs != U8G2_ESP32_HAL_UNDEFINED) {
- bitmask = bitmask | (1ull<<u8g2_esp32_hal.cs);
- }
-
- if (bitmask==0) {
- break;
- }
- gpio_config_t gpioConfig;
- gpioConfig.pin_bit_mask = bitmask;
- gpioConfig.mode = GPIO_MODE_OUTPUT;
- gpioConfig.pull_up_en = GPIO_PULLUP_DISABLE;
- gpioConfig.pull_down_en = GPIO_PULLDOWN_ENABLE;
- gpioConfig.intr_type = GPIO_INTR_DISABLE;
- gpio_config(&gpioConfig);
- break;
- }
-
- // Set the GPIO reset pin to the value passed in through arg_int.
- case U8X8_MSG_GPIO_RESET:
- if (u8g2_esp32_hal.reset != U8G2_ESP32_HAL_UNDEFINED) {
- gpio_set_level(u8g2_esp32_hal.reset, arg_int);
- }
- break;
- // Set the GPIO client select pin to the value passed in through arg_int.
- case U8X8_MSG_GPIO_CS:
- if (u8g2_esp32_hal.cs != U8G2_ESP32_HAL_UNDEFINED) {
- gpio_set_level(u8g2_esp32_hal.cs, arg_int);
- }
- break;
- // Set the Software I²C pin to the value passed in through arg_int.
- case U8X8_MSG_GPIO_I2C_CLOCK:
- if (u8g2_esp32_hal.scl != U8G2_ESP32_HAL_UNDEFINED) {
- gpio_set_level(u8g2_esp32_hal.scl, arg_int);
- // printf("%c",(arg_int==1?'C':'c'));
- }
- break;
- // Set the Software I²C pin to the value passed in through arg_int.
- case U8X8_MSG_GPIO_I2C_DATA:
- if (u8g2_esp32_hal.sda != U8G2_ESP32_HAL_UNDEFINED) {
- gpio_set_level(u8g2_esp32_hal.sda, arg_int);
- // printf("%c",(arg_int==1?'D':'d'));
- }
- break;
-
- // Delay for the number of milliseconds passed in through arg_int.
- case U8X8_MSG_DELAY_MILLI:
- vTaskDelay(arg_int/portTICK_PERIOD_MS);
- break;
- }
- return 0;
- } // u8g2_esp32_gpio_and_delay_cb
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