【GD32L233C-START】11、硬件I2C驱动0.96吋OLED

0、前言

关于oled的详细驱动，可查看一文彻底了解ssd1306驱动0.96寸oled，本文使用gd32l233硬件i2c驱动。

可以看出有两路I2C，分别是I2C0，I2C1。

可以看出，I2C1的引脚为PB10和PB11。

可以看出，是复用功能4。

（1）初始化i2c

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<code class="javascript">void I2cInit(void){    rcu_periph_clock_enable(RCU_I2C1);    rcu_periph_clock_enable(RCU_GPIOB);    gpio_af_set(GPIOB, GPIO_AF_4, GPIO_PIN_10);    gpio_af_set(GPIOB, GPIO_AF_4, GPIO_PIN_11);    gpio_mode_set(GPIOB, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_10);    gpio_output_options_set(GPIOB, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ, GPIO_PIN_10);    gpio_mode_set(GPIOB, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_11);    gpio_output_options_set(GPIOB, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ, GPIO_PIN_11);    /* configure I2C timing */    i2c_timing_config(I2C1, 0, 0x3, 0);    i2c_master_clock_config(I2C1, 0x13, 0x36);    /* configure I2C address */    i2c_address_config(I2C1, I2C_OWN_ADDRESS7, I2C_ADDFORMAT_7BITS);    /* configure slave address */    i2c_master_addressing(I2C1, I2C_SLAVE_ADDRESS7, I2C_MASTER_TRANSMIT);    /* configure number of bytes to be transferred */    i2c_transfer_byte_number_config(I2C1, 2);    /* enable I2C1 */    i2c_enable(I2C1);}</code>

（2）写OLED下面分写命令和数据.

<code class="javascript">void SSD1306_WriteCmd(uint8_t var){    /* wait until I2C bus is idle */    while(i2c_flag_get(I2C1, I2C_FLAG_I2CBSY));    /* send a start condition to I2C bus */    i2c_start_on_bus(I2C1);    /* wait until the transmit data buffer is empty */    I2C_STAT(I2C1) |= I2C_STAT_TBE;    while(!i2c_flag_get(I2C1, I2C_FLAG_TBE));    /* data transmission */    i2c_data_transmit(I2C1, 0x00);    /* wait until the TI bit is set */    while(!i2c_flag_get(I2C1, I2C_FLAG_TBE));    i2c_data_transmit(I2C1, var);    /* wait until the TI bit is set */    while(!i2c_flag_get(I2C1, I2C_FLAG_TBE));    /* wait for transfer complete flag */    while(!i2c_flag_get(I2C1, I2C_FLAG_TC));    /* send a stop condition to I2C bus */    i2c_stop_on_bus(I2C1);    /* wait until stop condition generate */    while(!i2c_flag_get(I2C1, I2C_FLAG_STPDET));    /* clear the STPDET bit */    i2c_flag_clear(I2C1, I2C_FLAG_STPDET);}void SSD1306_WriteData(uint8_t var){    /* wait until I2C bus is idle */    while(i2c_flag_get(I2C1, I2C_FLAG_I2CBSY));    /* send a start condition to I2C bus */    i2c_start_on_bus(I2C1);    /* wait until the transmit data buffer is empty */    I2C_STAT(I2C1) |= I2C_STAT_TBE;    while(!i2c_flag_get(I2C1, I2C_FLAG_TBE));    /* data transmission */    i2c_data_transmit(I2C1, 0x40);    /* wait until the TI bit is set */    while(!i2c_flag_get(I2C1, I2C_FLAG_TBE));    i2c_data_transmit(I2C1, var);    /* wait until the TI bit is set */    while(!i2c_flag_get(I2C1, I2C_FLAG_TBE));    /* wait for transfer complete flag */    while(!i2c_flag_get(I2C1, I2C_FLAG_TC));    /* send a stop condition to I2C bus */    i2c_stop_on_bus(I2C1);    /* wait until stop condition generate */    while(!i2c_flag_get(I2C1, I2C_FLAG_STPDET));    /* clear the STPDET bit */    i2c_flag_clear(I2C1, I2C_FLAG_STPDET);}</code>

（3）OLED相关驱动

<code class="javascript">//坐标设置：也就是在哪里显示void OledSetPos(uint8_t x, uint8_t y) {   //以下3个寄存器只在页寻址的模式下有效  SSD1306_WriteCmd(0xb0+y);             //页地址设置     0xb0~0xb7  SSD1306_WriteCmd(((x&0xf0)>>4)|0x10); //列高位地址设置  SSD1306_WriteCmd((x&0x0f));           //列低位地址设置}  //开启Oled显示void OledDisplayOn(void){  SSD1306_WriteCmd(0X8D);  //SET DCDC命令  SSD1306_WriteCmd(0X14);  //DCDC ON  SSD1306_WriteCmd(0XAF);  //DISPLAY ON} //关闭Oled显示   void OledDisplayOff(void){  SSD1306_WriteCmd(0X8D);  //SET DCDC命令  SSD1306_WriteCmd(0X10);  //DCDC OFF  SSD1306_WriteCmd(0XAE);  //DISPLAY OFF} //清屏函数,清完屏,整个屏幕是黑色的!和没点亮一样  void OledClear(void)  {    uint8_t i,n;    for(i=0;i<8;i++)    {      SSD1306_WriteCmd (0xb0+i);    //设置页地址（0~7）    SSD1306_WriteCmd (0x00);      //设置显示位置—列低地址    SSD1306_WriteCmd (0x10);      //设置显示位置—列高地址       for(n=0;n<128;n++)      SSD1306_WriteData(0);   } //更新显示} //在指定位置显示一个字符,包括部分字符//x:0~127，y:0~7//Char_Size:选择字体 16/12 void OledShowChar(uint8_t x,uint8_t y,uint8_t chr,uint8_t Char_Size){        uint8_t c=0,i=0;    c=chr-' ';//得到偏移后的值  if(x>MAX_COLUMN-1)  {    x=0;    y=y+2;  }  if(Char_Size ==16)  {    OledSetPos(x,y);    for(i=0;i<8;i++)    {      SSD1306_WriteData(F8X16[c*16+i]);//先写上半部分    }        OledSetPos(x,y+1);    for(i=0;i<8;i++)    {      SSD1306_WriteData(F8X16[c*16+i+8]);//后写下半部分    }  }  else  {    OledSetPos(x,y);    for(i=0;i<6;i++)    {      SSD1306_WriteData(F6x8[c][i]);    }  }} //显示一个字符串void OledShowString(uint8_t x,uint8_t y,char *str,uint8_t Char_Size){  unsigned char j=0;    while (str[j]!='\0')  {    OledShowChar(x,y,str[j],Char_Size);    x+=8;    if(x>120)    {      x=0;      y+=2;    }    j++;//移动一次就是一个page，取值0-7  }} //显示汉字//由于汉字是16*16大小的，所以最多显示4行汉字//index:在汉字取模中的索引void OledShowCN(uint8_t x,uint8_t y,uint8_t index){            uint8_t t;  OledSetPos(x,y);  for(t=0;t<16;t++)  {    SSD1306_WriteData(Hzk[index][t]);  }    OledSetPos(x,y+1);  for(t=0;t<16;t++)  {    SSD1306_WriteData(Hzk[index][t+16]);  }}</code>

（4）OLED初始化

<code class="javascript">void OledInit(void){  DelayMs(300);  DelayMs(300);  //SSD1306复位之后，默认的是页寻址方式    SSD1306_WriteCmd(0xAE);//--display off    SSD1306_WriteCmd(0x00);//--set low column address  SSD1306_WriteCmd(0x10);//--set high column address  SSD1306_WriteCmd(0x40);//--set start line address      SSD1306_WriteCmd(0xB0);//--set page address    SSD1306_WriteCmd(0x81);// contract control  SSD1306_WriteCmd(0xFF);//--128     SSD1306_WriteCmd(0xA1);//set segment re-map  0 to 127   SSD1306_WriteCmd(0xA6);//set normal  display    SSD1306_WriteCmd(0xA8);//set multiplex ratio(1 to 64)  SSD1306_WriteCmd(0x3F);//--1/32 duty    SSD1306_WriteCmd(0xC8);//Com scan direction  SSD1306_WriteCmd(0xD3);//set display offset  SSD1306_WriteCmd(0x00);//no offset  SSD1306_WriteCmd(0xD5);//set display clock divide ratio/oscillator frequency    SSD1306_WriteCmd(0x80);//  SSD1306_WriteCmd(0xD8);//set area color mode off  SSD1306_WriteCmd(0x05);//  SSD1306_WriteCmd(0xD9);//Set Pre-Charge Period  SSD1306_WriteCmd(0xF1);//  SSD1306_WriteCmd(0xDA);//set com pin  hardware configuartion  SSD1306_WriteCmd(0x12);//  SSD1306_WriteCmd(0xDB);//set Vcomh  SSD1306_WriteCmd(0x30);//0x20,0.77xVcc  SSD1306_WriteCmd(0x8D);//set charge pump enable  SSD1306_WriteCmd(0x14);//  SSD1306_WriteCmd(0xAF);//--turn on Oled panel}</code>

（5）显示测试

<code class="javascript">void OledDisplayTest(void){I2cInit();OledInit();OledClear(); OledShowString(28,0,(char *)("EEWORLD"),16);OledShowString(40,2,(char *)("GD32"),16);OledShowString(40,4,(char *)("2022"),16);OledShowCN(24,6,0);OledShowCN(40,6,1);OledShowCN(56,6,2);OledShowCN(72,6,3);}</code>