293 lines
7.5 KiB
C
293 lines
7.5 KiB
C
#include <stdio.h>
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#include <string.h>
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#include "driver/i2c_master.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#define LV_CONF_INCLUDE_SIMPLE 1
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#include "lv_conf.h"
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#include "lvgl.h"
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#define I2C_SCL 19
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#define I2C_SDA 21
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/* Docs: https://cdn-shop.adafruit.com/datasheets/SSD1306.pdf */
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#define DISP_ADDRESS 0X3c
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#define I2C_FREQ 400000
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static i2c_master_dev_handle_t disp_handle;
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static lv_obj_t *counter_label;
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static SemaphoreHandle_t flush_sem = NULL;
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static uint8_t lv_buf[(128 * 64/8)+8];
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void init_i2c(void){
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i2c_master_bus_config_t i2c_mst_config = {
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.clk_source = I2C_CLK_SRC_DEFAULT,
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.i2c_port = I2C_NUM_0,
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.scl_io_num = I2C_SCL,
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.sda_io_num = I2C_SDA,
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.glitch_ignore_cnt = 7,
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.flags.enable_internal_pullup = true,
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};
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i2c_master_bus_handle_t bus_handle;
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i2c_new_master_bus(&i2c_mst_config, &bus_handle);
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i2c_device_config_t dev_cfg = {
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.dev_addr_length = I2C_ADDR_BIT_LEN_7,
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.device_address = DISP_ADDRESS,
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.scl_speed_hz = I2C_FREQ,
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};
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ESP_ERROR_CHECK(i2c_master_bus_add_device(bus_handle, &dev_cfg, &disp_handle));
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}
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void i2c_disp_send_cmd(uint8_t cmd){
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uint8_t data[2] = {0x00, cmd}; /*command mode*/
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i2c_master_transmit(disp_handle, data, sizeof(data), pdMS_TO_TICKS(1000));
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}
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void i2c_disp_send_data(uint8_t *data, size_t len){
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uint8_t *buf = malloc(len+1);
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buf[0] = 0x40;
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memcpy(&buf[1], data, len);
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esp_err_t ret = i2c_master_transmit(disp_handle, buf, len+1, pdMS_TO_TICKS(2000));
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free(buf);
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return;
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}
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void init_display(void){
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i2c_disp_send_cmd(0xAE); // Display OFF
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i2c_disp_send_cmd(0xD5); // Set display clock divide ratio/oscillator frequency
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i2c_disp_send_cmd(0x80); // Default value
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i2c_disp_send_cmd(0xA8); // Set multiplex ratio
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i2c_disp_send_cmd(0x3F); // 1/64 duty (64 COM lines)
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i2c_disp_send_cmd(0xD3); // Set display offset
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i2c_disp_send_cmd(0x00); // No offset
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i2c_disp_send_cmd(0x40); // Set display start line to 0
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i2c_disp_send_cmd(0x8D); // Charge pump setting
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i2c_disp_send_cmd(0x14); // Enable charge pump
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i2c_disp_send_cmd(0x20); // Set Memory Addressing Mode
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i2c_disp_send_cmd(0x00); // Horizontal addressing mode
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i2c_disp_send_cmd(0xA1); // Set segment re-map (A0h/A1h)
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i2c_disp_send_cmd(0xC8); // Set COM output scan direction
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i2c_disp_send_cmd(0xDA); // Set COM pins hardware configuration
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i2c_disp_send_cmd(0x12); // Alternative COM pin config
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i2c_disp_send_cmd(0x81); // Set contrast control
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i2c_disp_send_cmd(0xCF); // Max contrast
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i2c_disp_send_cmd(0xD9); // Set pre-charge period
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i2c_disp_send_cmd(0xF1); // Phase 1: 15 DCLK, Phase 2: 15 DCLK
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i2c_disp_send_cmd(0xDB); // Set VCOMH deselect level
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i2c_disp_send_cmd(0x40); // ~0.77 x VCC
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i2c_disp_send_cmd(0xA4); // Entire display ON (resume to RAM content)
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i2c_disp_send_cmd(0xA6); // Set normal display (not inverted)
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i2c_disp_send_cmd(0x2E); // Deactivate scroll
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i2c_disp_send_cmd(0xAF); // Display ON
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}
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void lvgl_flush_callback(lv_display_t *disp, const lv_area_t *area, uint8_t *px_map){
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if (flush_sem == NULL)
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{
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lv_display_flush_ready(disp);
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return;
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}
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xSemaphoreTake(flush_sem, portMAX_DELAY);
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uint16_t width = 128;
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uint16_t height = 64;
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uint8_t buf[128];
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memset(buf, 0, sizeof(buf));
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uint16_t bytes = (width * height + 7) / 8;
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uint16_t bytes_per_row = width / 8;
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uint16_t bytes_per_page = bytes_per_row*8;
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uint8_t page = 0;
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uint8_t page_x = 0;
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uint8_t page_y = 0;
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px_map += 8;
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for (uint16_t i = 0; i <= bytes; i++)
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{
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uint8_t byte = px_map[i];
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for (int bit = 7; bit >= 0; bit--)
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{
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if (byte & (1 << bit))
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{
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buf[page_x] |= (1 << page_y);
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}
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++page_x;
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}
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if ((i+1) % bytes_per_row == 0 && i+1 != 0)
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{
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page_y++;
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page_x = 0;
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}
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if((i+1)% bytes_per_page == 0 && i+1 != 0){
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i2c_disp_send_cmd(0x21);
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i2c_disp_send_cmd(0);
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i2c_disp_send_cmd(127);
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i2c_disp_send_cmd(0x22);
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i2c_disp_send_cmd(page);
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i2c_disp_send_cmd(page);
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i2c_disp_send_data(buf, sizeof(buf));
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memset(buf, 0, sizeof(buf));
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page++;
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page_y = 0;
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}
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}
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lv_display_flush_ready(disp);
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xSemaphoreGive(flush_sem);
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}
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void init_graphics(void){
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flush_sem = xSemaphoreCreateBinary();
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if(flush_sem != NULL){
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xSemaphoreGive(flush_sem);
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}
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memset(lv_buf, 0, sizeof(lv_buf));
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lv_init();
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printf("LVGL initialized\n");
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printf("LV_COLOR_DEPTH = %d\n", LV_COLOR_DEPTH);
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printf("sizeof(lv_color_t) = %zu bytes\n", sizeof(lv_color_t));
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printf("sizeof(lv_buf) = %zu bytes\n", sizeof(lv_buf));
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printf("Expected buffer: 128*64 = 8192 pixels\n");
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lv_display_t *display = lv_display_create(128, 64);
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lv_display_set_color_format(display, LV_COLOR_FORMAT_I1);
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printf("Display created\n");
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lv_display_set_flush_cb(display, lvgl_flush_callback);
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printf("Flush callback set\n");
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lv_display_set_buffers(display, lv_buf, NULL, sizeof(lv_buf), LV_DISPLAY_RENDER_MODE_FULL);
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printf("lvgl buffers set");
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lv_obj_t *scr = lv_screen_active();
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lv_obj_set_style_bg_color(scr, lv_color_black(), 0);
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lv_obj_set_style_bg_opa(scr, LV_OPA_COVER, 0);
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}
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void lv_tick_task(void *arg){
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while(1){
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lv_tick_inc(10);
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vTaskDelay(pdMS_TO_TICKS(10));
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}
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}
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void lv_task(void *arg){
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while(1){
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lv_task_handler();
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vTaskDelay(pdMS_TO_TICKS(50));
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}
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}
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void counter_task(void *arg){
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uint8_t counter = 0;
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while(1){
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char buf[4];
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snprintf(buf, sizeof(buf), "%02d", counter);
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lv_label_set_text(counter_label, buf);
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if(counter >= 99){
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counter = 0;
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} else {
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counter++;
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}
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vTaskDelay(pdMS_TO_TICKS(100));
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}
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}
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void create_counter(void){
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lv_obj_t *scr = lv_scr_act();
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/*
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// White box on top left
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lv_obj_t *box = lv_obj_create(scr);
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lv_obj_set_size(box, 10, 10);
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lv_obj_align(box, LV_ALIGN_TOP_LEFT, 0, 0);
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lv_obj_set_style_bg_color(box, lv_color_white(), 0);
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lv_obj_set_style_bg_opa(box, LV_OPA_COVER, 0);
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lv_obj_set_style_border_width(box, 0, 0);
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lv_obj_set_style_radius(box, 0, 0);
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lv_obj_set_style_pad_all(box, 0, 0);
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lv_obj_clear_flag(box, LV_OBJ_FLAG_SCROLLABLE);
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*/
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// text label
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counter_label = lv_label_create(scr);
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printf("Label created");
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lv_label_set_text(counter_label, "00");
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lv_obj_set_style_text_color(counter_label, lv_color_white(), 0);
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lv_obj_set_style_text_font(counter_label, &lv_font_montserrat_24, 0);
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lv_obj_set_style_pad_all(counter_label, 0, 0);
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lv_obj_set_style_margin_all(counter_label, 0, 0);
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lv_obj_set_width(counter_label, LV_SIZE_CONTENT);
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lv_obj_set_style_text_align(counter_label, LV_TEXT_ALIGN_LEFT, 0);
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lv_obj_align(counter_label, LV_ALIGN_CENTER, 0, 0);
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xTaskCreate(counter_task, "counter_task", 2048, NULL, 1, NULL);
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printf("Counter task created");
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}
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void app_main(void){
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init_i2c();
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vTaskDelay(pdMS_TO_TICKS(50));
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init_display();
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vTaskDelay(pdMS_TO_TICKS(50));
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init_graphics();
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vTaskDelay(pdMS_TO_TICKS(50));
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xTaskCreate(lv_tick_task, "lv_tick", 4096, NULL, 1, NULL);
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xTaskCreate(lv_task, "lv_task", 8192, NULL, 3, NULL);
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vTaskDelay(pdMS_TO_TICKS(200));
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create_counter();
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} |