board/main/embedded_display.c

#pragma once
#include <stdio.h>
#include <stdlib.h>

#include "codetab.h"
#include "driver/i2c.h"
#include "esp_log.h"

#define Brightness 0xCF
#define X_WIDTH 128
#define Y_WIDTH 64

#define I2C_ADDRESS 0x78
#define I2C_MASTER_NUM CONFIG_I2C_NUM

void i2cWriteByte(uint8_t reg, uint8_t data) {
  i2c_cmd_handle_t cmd = i2c_cmd_link_create();
  i2c_master_start(cmd);
  i2c_master_write_byte(cmd, I2C_ADDRESS | I2C_MASTER_WRITE, true);
  i2c_master_write_byte(cmd, reg, true);
  i2c_master_write_byte(cmd, data, true);
  i2c_master_stop(cmd);
  i2c_master_cmd_begin(I2C_MASTER_NUM, cmd, 1000 / portTICK_PERIOD_MS);
  i2c_cmd_link_delete(cmd);
}

void i2cWriteCommand(uint8_t data) { i2cWriteByte(0x00, data); }

void i2cWriteData(uint8_t data) { i2cWriteByte(0x40, data); }

void display_fill(uint8_t bmpData) {
  for (int y = 0; y < 8; y++) {
    i2cWriteCommand(0xB0 + y);
    i2cWriteCommand(0x01);
    i2cWriteCommand(0x10);
    for (int x = 0; x < X_WIDTH; x++) {
      i2cWriteData(bmpData);
    }
  }
}
void display_fill_rect(uint8_t x0, uint8_t y0, uint8_t x1, uint8_t y1,
                       uint8_t bmpData) {
  for (int y = y0; y < y1; y++) {
    i2cWriteCommand(0xB0 + y);
    i2cWriteCommand(0x01);
    i2cWriteCommand(0x10);
    for (int x = x0; x < x1; x++) {
      i2cWriteData(bmpData);
    }
  }
}

void display_set_pos(uint8_t x, uint8_t y) {
  i2cWriteCommand(0xB0 + y);
  i2cWriteCommand(((x & 0xF0) >> 4) | 0x10);
  i2cWriteCommand((x & 0x0F) | 0x01);
}

void display_print8_str(uint8_t x, uint8_t y, char str[]) {
  uint8_t c;
  for (uint8_t ch, ci = 0; ch = str[ci], ch != '\0'; ci++, x += 8) {
    c = ch - 0x20;
    display_set_pos(x, y);
    for (uint8_t cx = 0; cx < 8; cx++) {
      i2cWriteData(F8X16[c * 16 + cx]);
    }
    display_set_pos(x, y + 1);
    for (uint8_t cx = 0; cx < 8; cx++) {
      i2cWriteData(F8X16[c * 16 + cx + 8]);
    };
  }
}

void init_display() {
  i2cWriteCommand(0xAE);  // display off
  i2cWriteCommand(0x00);  // set lower column address
  i2cWriteCommand(0x10);  // set higher column address
  i2cWriteCommand(0x40);  // set start line address
  i2cWriteCommand(0x81);  // set contrast control register
  i2cWriteCommand(0xCF);  // set contrast
  i2cWriteCommand(0xA1);  // set segment re-map
  i2cWriteCommand(0xC8);  // set COM output scan direction
  i2cWriteCommand(0xA6);  // set normal display
  i2cWriteCommand(0xA8);  // set multiplex ratio(1 to 64)
  i2cWriteCommand(0x3F);  // 1/64 duty
  i2cWriteCommand(0xD3);  // set display offset
  i2cWriteCommand(0x00);  // not offset
  i2cWriteCommand(0xD5);  // set display clock divide ratio/oscillator frequency
  i2cWriteCommand(0x80);  // set divide ratio
  i2cWriteCommand(0xD9);  // set pre-charge period
  i2cWriteCommand(0xF1);  // set pre-charge voltage
  i2cWriteCommand(0xDA);  // set com pins hardware configuration
  i2cWriteCommand(0x12);
  i2cWriteCommand(0xDB);  // set vcomh
  i2cWriteCommand(0x40);  // 0.77*vcc
  i2cWriteCommand(0x20);  // set memory addressing mode
  i2cWriteCommand(0x02);  // set page addressing mode
  i2cWriteCommand(0x8D);  // set charge pump enable/disable
  i2cWriteCommand(0x14);  // set(0x10) disable
  i2cWriteCommand(0xAF);  // display on

  display_fill(0x00);
  display_set_pos(0, 0);
}