main/u8g2_esp32_hal.c

/**
 * @file u8g2_esp32_hal.c
 * @date Feb 12, 2017
 * @author kolban
 */

#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 spi_device_handle_t handle_spi;			///< SPI handle.
static i2c_cmd_handle_t    handle_i2c;			///< I2C handle.
static u8g2_esp32_hal_t    u8g2_esp32_hal;		///< HAL state data.
static bool		   initialized = false;


/*
 * 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 SPI communications.
 */
uint8_t u8g2_esp32_spi_byte_cb(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
{
    ESP_LOGD(TAG, "spi_byte_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.clk == U8G2_ESP32_HAL_UNDEFINED || u8g2_esp32_hal.mosi == U8G2_ESP32_HAL_UNDEFINED ||
			u8g2_esp32_hal.cs == U8G2_ESP32_HAL_UNDEFINED) {
		    break;
		}

		spi_bus_config_t bus_config;
                memset(&bus_config, 0, sizeof(spi_bus_config_t));
		bus_config.sclk_io_num   = u8g2_esp32_hal.clk; // CLK
		bus_config.mosi_io_num   = u8g2_esp32_hal.mosi; // MOSI
		bus_config.miso_io_num   = -1; // MISO
		bus_config.quadwp_io_num = -1; // Not used
		bus_config.quadhd_io_num = -1; // Not used
		//ESP_LOGI(TAG, "... Initializing bus.");
		ESP_ERROR_CHECK(spi_bus_initialize(HSPI_HOST, &bus_config, 1));

		spi_device_interface_config_t dev_config;
		dev_config.address_bits     = 0;
		dev_config.command_bits     = 0;
		dev_config.dummy_bits       = 0;
		dev_config.mode             = 0;
		dev_config.duty_cycle_pos   = 0;
		dev_config.cs_ena_posttrans = 0;
		dev_config.cs_ena_pretrans  = 0;
		dev_config.clock_speed_hz   = 10000;
		dev_config.spics_io_num     = u8g2_esp32_hal.cs;
		dev_config.flags            = 0;
		dev_config.queue_size       = 200;
		dev_config.pre_cb           = NULL;
		dev_config.post_cb          = NULL;
		//ESP_LOGI(TAG, "... Adding device bus.");
		ESP_ERROR_CHECK(spi_bus_add_device(HSPI_HOST, &dev_config, &handle_spi));

		break;
	}

	case U8X8_MSG_BYTE_SEND: {
		spi_transaction_t trans_desc;
		trans_desc.addr      = 0;
		trans_desc.cmd       = 0;
		trans_desc.flags     = 0;
		trans_desc.length    = 8 * arg_int; // Number of bits NOT number of bytes.
		trans_desc.rxlength  = 0;
		trans_desc.tx_buffer = arg_ptr;
		trans_desc.rx_buffer = NULL;

		//ESP_LOGI(TAG, "... Transmitting %d bytes.", arg_int);
		ESP_ERROR_CHECK(spi_device_transmit(handle_spi, &trans_desc));
		break;
	}
    }
    return 0;
}


/*
 * 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 || initialized) {
		    // here i test if already initialized, if it's the case don't do it again!
		    break;
		}

		i2c_config_t conf = {
		    .mode = I2C_MODE_MASTER,
		    .sda_io_num = u8g2_esp32_hal.sda,
		    .sda_pullup_en = GPIO_PULLUP_ENABLE,
		    .scl_io_num = u8g2_esp32_hal.scl,
		    .scl_pullup_en = GPIO_PULLUP_ENABLE,
		    .master.clk_speed = I2C_MASTER_FREQ_HZ,
		};
		ESP_ERROR_CHECK(i2c_param_config(I2C_MASTER_NUM, &conf));
		ESP_LOGI(TAG, "I2C gpio_sda: %d gpio_scl: %d clk_speed: %d master_num: %d",
			u8g2_esp32_hal.sda, u8g2_esp32_hal.scl, I2C_MASTER_FREQ_HZ, 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));
		initialized = true;
		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));
		i2c_master_cmd_begin(I2C_MASTER_NUM, handle_i2c, I2C_TIMEOUT_MS / portTICK_PERIOD_MS);
		i2c_cmd_link_delete(handle_i2c);
		break;
	}
    }
    return 0;
}


/*
 * 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;
}