156 lines
4.8 KiB
C
156 lines
4.8 KiB
C
/**
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* @file ssd1306_oled.c
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* @author xushenghao
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* @brief SSD1306 OLED display driver
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* @version 0.1
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* @note PB13-SCK PB12-SDA
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*/
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#include "ssd1306_oled.h"
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#include "ssd1306_oled.h"
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static i2c_t *ssd1306_oled;
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static uint8_t buffer[SSD1306_WIDTH * SSD1306_HEIGHT / 8]; // 定义屏幕缓冲区
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static void ssd1306_write_command(uint8_t command)
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{
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uint8_t data[2];
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data[0] = SSD1306_CMD_SET_LOW_COLUMN; // Co = 0, D/C# = 0
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data[1] = command;
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ssd1306_oled->interface.start(ssd1306_oled);
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ssd1306_oled->interface.write_byte(ssd1306_oled, SSD1306_I2C_ADDRESS);
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ssd1306_oled->interface.wait_ack(ssd1306_oled);
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ssd1306_oled->interface.write_byte(ssd1306_oled, data[0]);
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ssd1306_oled->interface.wait_ack(ssd1306_oled);
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ssd1306_oled->interface.write_byte(ssd1306_oled, data[1]);
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ssd1306_oled->interface.wait_ack(ssd1306_oled);
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ssd1306_oled->interface.stop(ssd1306_oled);
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}
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static void ssd1306_write_data(uint8_t data)
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{
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uint8_t buffer[2];
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buffer[0] = SSD1306_CMD_SET_START_LINE; // Co = 0, D/C# = 1
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buffer[1] = data;
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ssd1306_oled->interface.start(ssd1306_oled);
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ssd1306_oled->interface.write_byte(ssd1306_oled, SSD1306_I2C_ADDRESS);
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ssd1306_oled->interface.wait_ack(ssd1306_oled);
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ssd1306_oled->interface.write_byte(ssd1306_oled, buffer[0]);
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ssd1306_oled->interface.wait_ack(ssd1306_oled);
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ssd1306_oled->interface.write_byte(ssd1306_oled, buffer[1]);
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ssd1306_oled->interface.wait_ack(ssd1306_oled);
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ssd1306_oled->interface.stop(ssd1306_oled);
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}
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static void ssd1306_test(void)
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{
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}
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void ssd1306_init(void)
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{
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i2c_gpio_group_t gpios;
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gpios.scl = gpio_create(SSD1306_SCK_PORT, SSD1306_SCK_PIN);
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gpios.sda = gpio_create(SSD1306_SDA_PORT, SSD1306_SDA_PIN);
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ssd1306_oled = i2c_create(gpios, 0);
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ssd1306_write_command(SSD1306_CMD_DISPLAY_OFF);
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ssd1306_write_command(SSD1306_CMD_SET_DISPLAY_CLOCK_DIV);
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ssd1306_write_command(0x80);
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ssd1306_write_command(SSD1306_CMD_SET_MULTIPLEX);
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ssd1306_write_command(SSD1306_HEIGHT - 1);
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ssd1306_write_command(SSD1306_CMD_SET_DISPLAY_OFFSET);
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ssd1306_write_command(0x00);
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ssd1306_write_command(SSD1306_CMD_SET_START_LINE | 0x00);
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ssd1306_write_command(SSD1306_CMD_CHARGE_PUMP);
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ssd1306_write_command(0x14);
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ssd1306_write_command(SSD1306_CMD_MEMORY_MODE);
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ssd1306_write_command(0x00);
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ssd1306_write_command(SSD1306_CMD_SEG_REMAP | 0x01);
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ssd1306_write_command(SSD1306_CMD_COM_SCAN_DEC);
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ssd1306_write_command(SSD1306_CMD_SET_COM_PINS);
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ssd1306_write_command(0x12);
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ssd1306_write_command(SSD1306_CMD_SET_CONTRAST);
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ssd1306_write_command(0xCF);
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ssd1306_write_command(SSD1306_CMD_SET_PRECHARGE);
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ssd1306_write_command(0xF1);
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ssd1306_write_command(SSD1306_CMD_SET_VCOM_DETECT);
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ssd1306_write_command(0x40);
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ssd1306_write_command(SSD1306_CMD_DISPLAY_ALL_ON_RESUME);
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ssd1306_write_command(SSD1306_CMD_NORMAL_DISPLAY);
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ssd1306_write_command(SSD1306_CMD_DISPLAY_ON);
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ssd1306_test();
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}
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void ssd1306_display_on(void)
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{
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ssd1306_write_command(SSD1306_CMD_DISPLAY_ON);
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}
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void ssd1306_display_off(void)
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{
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ssd1306_write_command(SSD1306_CMD_DISPLAY_OFF);
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}
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void ssd1306_clear(void)
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{
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for (uint16_t i = 0; i < SSD1306_WIDTH * SSD1306_HEIGHT / 8; i++)
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{
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ssd1306_write_data(0x00);
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}
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}
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/**
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* @brief 在SSD1306屏幕上绘制一个像素点
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*
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* 在SSD1306 OLED显示屏上绘制一个像素点，如果指定位置超出屏幕范围，则不执行任何操作。
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*
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* @param x 像素点的x坐标
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* @param y 像素点的y坐标
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* @param color 像素点的颜色，非零值表示绘制像素点，零值表示清除像素点
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*/
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void ssd1306_draw_pixel(uint8_t x, uint8_t y, uint8_t color)
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{
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if (x >= SSD1306_WIDTH || y >= SSD1306_HEIGHT)
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{
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return;
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}
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if (color)
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{
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buffer[x + (y / 8) * SSD1306_WIDTH] |= (1 << (y % 8));
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}
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else
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{
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buffer[x + (y / 8) * SSD1306_WIDTH] &= ~(1 << (y % 8));
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}
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}
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/**
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* @brief 更新SSD1306 OLED显示屏的内容
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*
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* 此函数将缓冲区中的数据写入SSD1306 OLED显示屏，从而更新显示内容。
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*
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* 首先，通过发送命令设置列地址和页地址，然后将缓冲区中的数据逐行写入显示屏。
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*
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* @note 在调用此函数之前，需要将需要显示的数据写入缓冲区。
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*/
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void ssd1306_update_screen(void)
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{
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for (uint8_t i = 0; i < SSD1306_HEIGHT / 8; i++)
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{
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ssd1306_write_command(SSD1306_CMD_COLUMN_ADDR);
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ssd1306_write_command(0);
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ssd1306_write_command(SSD1306_WIDTH - 1);
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ssd1306_write_command(SSD1306_CMD_PAGE_ADDR);
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ssd1306_write_command(i);
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ssd1306_write_command(i);
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for (uint8_t j = 0; j < SSD1306_WIDTH; j++)
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{
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ssd1306_write_data(buffer[j + i * SSD1306_WIDTH]);
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}
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}
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}
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