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本文來源電子發燒友社區，作者：黃煉榕，帖子地址：https://bbs.elecfans.com/jishu_2021255_1_1.html

既然有了gpio，那就先看看基于gpio實現的iic通信吧。別的不多說先弄清楚板子上的oLED引腳號。

OLED
VCC
GND
SCL	GPIO14
SDA	GPIO13

把支持I2C的宏定義打開，該宏定義所在位置為：
vendorhisihi3861hi3861buildconfigusr_config.mk
找到后修改如下：CONFIG_I2C_SUPPORT=y

示例一個寫字節函數
void OLED_WR_Byte(uint8_t dat,uint8_t cmd){
hi_u8 m_send_data[2] = { 0 };
hi_u32 status;
hi_i2c_data hi3861_i2c_data = { 0 };
if(cmd) {
m_send_data[0] = 0x40;
}
else {
m_send_data[0] = 0x00;
}
m_send_data[1] = dat;
hi3861_i2c_data.send_buf = m_send_data;
hi3861_i2c_data.send_len = 2;
status = hi_i2c_write(HI_I2C_IDX_0, 0x78, &hi3861_i2c_data);
if (status != HI_ERR_SUCCESS) {
printf(" Error: I2C write status = 0x%x! rn", status);
return;
}
}

初始化oled還是跟以前一樣
void OLED_Init(void){
OLED_WR_Byte(0xAE,OLED_CMD); //--turn off oled panel OLED_WR_Byte(0x00,OLED_CMD); //---set low column address OLED_WR_Byte(0x10,OLED_CMD); //---set high column address OLED_WR_Byte(0x40,OLED_CMD); //--set start line addressSet Mapping RAMdisplayStart Line (0x00~0x3F)
OLED_WR_Byte(0x81,OLED_CMD); //--set contrast control register OLED_WR_Byte(0xCF,OLED_CMD); // Set SEG Output Current Brightness OLED_WR_Byte(0xA1,OLED_CMD); //--Set SEG/Column Mapping 0xa0左右反置 0xa1正常
OLED_WR_Byte(0xC8,OLED_CMD); //Set COM/Row Scan Direction 0xc0上下反置 0xc8正常
OLED_WR_Byte(0xA6,OLED_CMD); //--set normal display OLED_WR_Byte(0xA8,OLED_CMD); //--set multiplex ratio(1 to 64) OLED_WR_Byte(0x3f,OLED_CMD); //--1/64 duty OLED_WR_Byte(0xD3,OLED_CMD); //-set display offset Shift Mapping RAM Counter (0x00~0x3F)
OLED_WR_Byte(0x00,OLED_CMD); //-not offset OLED_WR_Byte(0xd5,OLED_CMD); //--set displayclockdivide ratio/oscillator frequency
OLED_WR_Byte(0x80,OLED_CMD); //--set divide ratio, Set Clock as 100 Frames/Sec
OLED_WR_Byte(0xD9,OLED_CMD); //--set pre-charge period OLED_WR_Byte(0xF1,OLED_CMD); //Set Pre-Charge as 15 Clocks & Discharge as 1 Clock
OLED_WR_Byte(0xDA,OLED_CMD); //--set com pins hardware configuration OLED_WR_Byte(0x12,OLED_CMD);
OLED_WR_Byte(0xDB,OLED_CMD); //--set vcomh OLED_WR_Byte(0x40,OLED_CMD); //Set VCOM Deselect Level OLED_WR_Byte(0x20,OLED_CMD); //-Set Page Addressing Mode (0x00/0x01/0x02)
OLED_WR_Byte(0x02,OLED_CMD); //
OLED_WR_Byte(0x8D,OLED_CMD); //--set Charge Pump enable/disable OLED_WR_Byte(0x14,OLED_CMD); //--set(0x10) disable OLED_WR_Byte(0xA4,OLED_CMD); // Disable Entire Display On (0xa4/0xa5) OLED_WR_Byte(0xA6,OLED_CMD); // Disable Inverse Display On (0xa6/a7) OLED_WR_Byte(0xAF,OLED_CMD); //--turn on oled panel OLED_WR_Byte(0xAF,OLED_CMD); /*display ON*/ OLED_Clear(); OLED_Set_Pos(0,0); }

void OLED_Demo(void){
OLED_Init();
OLED_Clear();
for(i=0;i<8;i++)? ? {
OLED_ShowCHinese(i*16,0,i+0);
}
for(i=0;i<7;i++)? ? {
OLED_ShowCHinese(i*16,2,i+8);
}
for(i=0;i<4;i++)? ? {
OLED_ShowCHinese(i*16,4,i+15);
}
for(i=0;i<4;i++)? ? {
OLED_ShowCHinese(i*16,6,i+19);
}
}

SYS_RUN(OLED_Demo);

編譯燒錄即可

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