363 lines
8.9 KiB
C
363 lines
8.9 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_COLOR_DEPTH 16
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#define LV_USE_LOG 0
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#define LV_FONT_MONSTERRAT_14 1
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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 100000
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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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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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vTaskDelay(pdMS_TO_TICKS(1));
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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; data mode
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memcpy(&buf[1], data, len);
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ESP_ERROR_CHECK(
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i2c_master_transmit(disp_handle, buf, len + 1, pdMS_TO_TICKS(100)));
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free(buf);
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}*/
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void i2c_disp_send_data(uint8_t *data, size_t len){
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if(len <= 1024){
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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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const size_t chunk_size = 64;
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for (size_t offset = 0; offset < len; offset += chunk_size){
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size_t remaining = len - offset;
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size_t to_send = (remaining < chunk_size) ? remaining : chunk_size;
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uint8_t *buf = malloc(to_send + 1);
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buf[0] = 0x40; /* data mode */
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memcpy(&buf[1], &data[offset], to_send);
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esp_err_t ret = i2c_master_transmit(disp_handle, buf, to_send + 1, pdMS_TO_TICKS(500));
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if (ret != ESP_OK)
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{
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printf("ERROR at offset %d: 0x%x\n", offset, ret);
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}
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free(buf);
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vTaskDelay(pdMS_TO_TICKS(1));
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}
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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_disp_drv_t *drv, const lv_area_t *area, lv_color_t *color_p){
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if(flush_sem == NULL){
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lv_disp_flush_ready(drv);
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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 = area->x2 - area->x1 + 1;
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uint16_t height = area->y2 - area->y1 + 1;
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uint8_t start_page = area->y1 / 8;
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uint8_t end_page = area->y2 / 8;
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uint8_t num_pages = end_page - start_page + 1;
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size_t mono_size = width * num_pages;
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uint8_t *mono_buf = malloc(mono_size);
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memset(mono_buf, 0, mono_size);
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for (uint16_t page = 0; page < num_pages; page++){
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for (uint16_t x = 0; x < width; x++){
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uint8_t page_byte = 0;
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for (uint8_t bit = 0; bit < 8; bit++)
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{
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uint16_t src_y = page * 8 + bit;
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if (src_y < height)
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{
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lv_color_t color = color_p[src_y * width + x];
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if (color.full != 0)
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{
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page_byte |= (1 << bit);
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}
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}
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}
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mono_buf[page * width + x] = page_byte;
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}
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}
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i2c_disp_send_cmd(0x21);
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i2c_disp_send_cmd(area->x1);
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i2c_disp_send_cmd(area->x2);
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i2c_disp_send_cmd(0x22);
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i2c_disp_send_cmd(start_page);
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i2c_disp_send_cmd(end_page);
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i2c_disp_send_data(mono_buf, mono_size);
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free(mono_buf);
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lv_disp_flush_ready(drv);
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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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lv_init();
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static lv_disp_draw_buf_t disp_buf;
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static lv_color_t buf1[128*8];
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lv_disp_draw_buf_init(&disp_buf, buf1, NULL, 128*8);
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static lv_disp_drv_t disp_drv;
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lv_disp_drv_init(&disp_drv);
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disp_drv.hor_res = 128;
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disp_drv.ver_res = 64;
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disp_drv.flush_cb = lvgl_flush_callback;
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disp_drv.draw_buf = &disp_buf;
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lv_disp_t *disp = lv_disp_drv_register(&disp_drv);
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lv_disp_set_default(disp);
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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(10));
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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(1000));
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}
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}
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void create_counter(void){
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counter_label = lv_label_create(lv_scr_act());
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lv_obj_set_style_text_font(counter_label, &lv_font_montserrat_14, 0);
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lv_label_set_text(counter_label, "00");
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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, 5, NULL);
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}
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void clear_display(void)
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{
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printf("Clearing display...\n");
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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(0);
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i2c_disp_send_cmd(7);
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uint8_t zeros[128];
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memset(zeros, 0x00, 128);
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for (int page = 0; page < 8; page++)
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{
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i2c_disp_send_data(zeros, 128);
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}
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printf("Cleared!\n");
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}
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void draw_text_ok(void)
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{
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printf("Drawing 'OK'...\n");
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uint8_t letter_O[8] = {
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0b00000000, // column 0 (tyhjä)
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0b01111110, // column 1 (vasen reuna)
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0b10000001, // column 2
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0b10000001, // column 3
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0b10000001, // column 4
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0b01111110, // column 5 (oikea reuna)
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0b00000000, // column 6 (tyhjä)
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0b00000000 // column 7 (väli)
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};
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// Kirjain K
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uint8_t letter_K[8] = {
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0b00000000, // column 0 (tyhjä)
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0b11111111, // column 1 (pystyviiva)
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0b00011000, // column 2
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0b00100100, // column 3
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0b01000010, // column 4
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0b10000001, // column 5
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0b00000000, // column 6 (tyhjä)
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0b00000000 // column 7
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};
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// Aseta page 3 (keskellä näyttöä), column 50
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i2c_disp_send_cmd(0x21);
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i2c_disp_send_cmd(50);
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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(3);
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i2c_disp_send_cmd(3);
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// Lähetä "OK"
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i2c_disp_send_data(letter_O, 8);
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i2c_disp_send_data(letter_K, 8);
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printf("'OK' drawn!\n");
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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(100));
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init_display();
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vTaskDelay(pdMS_TO_TICKS(200));
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/*
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init_graphics();
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vTaskDelay(pdMS_TO_TICKS(100));
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create_counter();
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vTaskDelay(pdMS_TO_TICKS(100));
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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, 5, NULL);
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*/
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while(1){
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clear_display();
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vTaskDelay(pdMS_TO_TICKS(1000));
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draw_text_ok();
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vTaskDelay(pdMS_TO_TICKS(1000));
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}
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} |