--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main/u8g2_esp32_hal.c Tue Oct 08 12:00:31 2019 +0200
@@ -0,0 +1,235 @@
+#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