STM32F401RET6之t硬件I2C的oled

硬件

- 之前讲过了，就不讲了

软件需求

- STM32CubeMX生成一个基本的I2C，用的是I2C1

软件配置

上一篇文章记录的很清楚了，这里就不多讲了

• I2C配置
  
• 时钟配置
  

程序

• 字符库
• 显存

//引用I2C1
extern I2C_HandleTypeDef hi2c1;

//命令操作数
#define OLED_CMD_HAL (0x00)
#define OLED_DATA_HAL (0x01)



//定义OLED地址
#define OLED_I2C_ADDRESS (0x78)

//最大像素值
#define MAX_COLUMN      128
#define MAX_ROW         64

#define X_WIDTH         MAX_COLUMN
#define Y_WIDTH         MAX_ROW



//最大宽、高
#define CHAR_SIZE_WIDTH 6
#define CHAR_SIZE_HIGHT 12

//定义显示方式
typedef enum{
    PEN_CLEAR = 0x00,//将所有像素熄灭
    PEN_WRITE = 0x01,//将所有像素点亮
    PEN_INVERSION = 0x02//将所有像素状态反转
} pen_typedef;

//定义显示数据
char OLED_GRAM_HAL[128][8] = {0};

• oled写入操作

void oled_write_byte(uint8_t dat, uint8_t cmd)
{
    static uint8_t cmd_data[2];
    if(cmd == OLED_CMD_HAL)
    {
        cmd_data[0] = 0x00;
    }
    else
    {
        cmd_data[0] = 0x40;
    }
    cmd_data[1] = dat;
    HAL_I2C_Master_Transmit(&hi2c1, OLED_I2C_ADDRESS, cmd_data, 2, 10);
}

• 设置坐标点

//设置光标位置
void OLED_set_pos(uint8_t x,uint8_t y)
{
    oled_write_byte((0xb0 + y), OLED_CMD_HAL);          //set page address y
    oled_write_byte(((x & 0xf0) >> 4) | 0x10, OLED_CMD_HAL);  //set column high address
    oled_write_byte((x & 0x0f), OLED_CMD_HAL);            //set column low address
}

• 刷新显存

//刷新oled内部的GRAM
void OLED_refresh_gram(void)
{
    uint8_t i,n;
    for (i = 0; i< 8; i++)
    {
        OLED_set_pos(0,i);
        for (n = 0; n < 128; n++)
        {
            oled_write_byte(OLED_GRAM_HAL[n][i], OLED_DATA_HAL );
        }
    }
}

• 画一个像素点

/对（x，y）坐标的一个像素点进行操作
void OLED_draw_point(int8_t x, int8_t y, pen_typedef pen)
{
    uint8_t page = 0, row = 0;

    /* check the corrdinate */
    if ((x < 0) || (x > (X_WIDTH - 1)) || (y < 0) || (y > (Y_WIDTH - 1)))
    {
        return;
    }
    page = y / 8;
    row = y % 8;

    if (pen == PEN_WRITE)
    {
        OLED_GRAM_HAL[x][page] |= 1 << row;
    }
    else if (pen == PEN_INVERSION)
    {
        OLED_GRAM_HAL[x][page] ^= 1 << row;
    }
    else
    {
        OLED_GRAM_HAL[x][page] &= ~(1 << row);
    }
}

• 显示一个字符

//显示一个字符
void OLED_show_char(uint8_t row, uint8_t col, uint8_t chr)
{
    uint8_t x = col * 6;
    uint8_t y = row * 12;
    uint8_t temp, t, t1;
    uint8_t y0 = y;
    chr = chr - ' ';

    for (t = 0; t < 12; t++)
    {
        temp = asc2_1206[chr][t];

        for (t1 = 0; t1 < 8; t1++)
        {
            if (temp&0x80)
                OLED_draw_point(x, y, PEN_WRITE);
            else
                OLED_draw_point(x, y, PEN_CLEAR);

            temp <<= 1;
            y++;
            if ((y - y0) == 12)
            {
                y = y0;
                x++;
                break;
            }
        }
    }
}

• oled初始化

void HAL_OLED_init(void)
{
    oled_write_byte(0xAE,OLED_CMD_HAL);//--turn off oled panel
	oled_write_byte(0x00,OLED_CMD_HAL);//---set low column address
	oled_write_byte(0x10,OLED_CMD_HAL);//---set high column address
	oled_write_byte(0x40,OLED_CMD_HAL);//--set start line address  Set Mapping RAM Display Start Line (0x00~0x3F)
	oled_write_byte(0x81,OLED_CMD_HAL);//--set contrast control register
	oled_write_byte(0xCF,OLED_CMD_HAL);// Set SEG Output Current Brightness
	oled_write_byte(0xA1,OLED_CMD_HAL);//--Set SEG/Column Mapping     0xa0左右反置 0xa1正常
	oled_write_byte(0xC8,OLED_CMD_HAL);//Set COM/Row Scan Direction   0xc0上下反置 0xc8正常
	oled_write_byte(0xA6,OLED_CMD_HAL);//--set normal display
	oled_write_byte(0xA8,OLED_CMD_HAL);//--set multiplex ratio(1 to 64)
	oled_write_byte(0x3f,OLED_CMD_HAL);//--1/64 duty
	oled_write_byte(0xD3,OLED_CMD_HAL);//-set display offset	Shift Mapping RAM Counter (0x00~0x3F)
	oled_write_byte(0x00,OLED_CMD_HAL);//-not offset
	oled_write_byte(0xd5,OLED_CMD_HAL);//--set display clock divide ratio/oscillator frequency
	oled_write_byte(0x80,OLED_CMD_HAL);//--set divide ratio, Set Clock as 100 Frames/Sec
	oled_write_byte(0xD9,OLED_CMD_HAL);//--set pre-charge period
	oled_write_byte(0xF1,OLED_CMD_HAL);//Set Pre-Charge as 15 Clocks & Discharge as 1 Clock
	oled_write_byte(0xDA,OLED_CMD_HAL);//--set com pins hardware configuration
	oled_write_byte(0x12,OLED_CMD_HAL);
	oled_write_byte(0xDB,OLED_CMD_HAL);//--set vcomh
	oled_write_byte(0x40,OLED_CMD_HAL);//Set VCOM Deselect Level
	oled_write_byte(0x20,OLED_CMD_HAL);//-Set Page Addressing Mode (0x00/0x01/0x02)
	oled_write_byte(0x02,OLED_CMD_HAL);//
	oled_write_byte(0x8D,OLED_CMD_HAL);//--set Charge Pump enable/disable
	oled_write_byte(0x14,OLED_CMD_HAL);//--set(0x10) disable
	oled_write_byte(0xA4,OLED_CMD_HAL);// Disable Entire Display On (0xa4/0xa5)
	oled_write_byte(0xA6,OLED_CMD_HAL);// Disable Inverse Display On (0xa6/a7) 
	oled_write_byte(0xAF,OLED_CMD_HAL);
}

主函数

• 包含头文件
• 函数初始化

int main(void)
{
 HAL_Init();
SystemClock_Config();
MX_I2C1_Init();
HAL_OLED_init();
MX_GPIO_Init();
while (1)
  {
        OLED_show_char(0, 0, 'C');//显示ASCII字符	        
        OLED_show_char(1, 2, 'D');//显示ASCII字符	   
        OLED_refresh_gram();
        HAL_Delay(500);


}
}

结语

记录一下STM32硬件I2C使用oled