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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 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.
#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 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; } // u8g2_esp32_spi_byte_cb
/*
* 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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