OLED的IIC方式

问路 · 发表于 2015-8-12 20:38:01

我就自己的经验来进行说明
要看清自己使用的OLED屏的分辨率大小，并不能直接复制别人的初始化参数，一般手册上会有初始化参数的，就根据手册上来，IIC用到的几个简单的函数

[mw_shl_code=c,true]//??????IIC void IIC_Init(void) { RCC->APB2ENR|=1<<2;//?????????èIO PORTC?±?? GPIOA->CRH&=0XFFF00FFF;//PC11/12 ???ì???? GPIOA->CRH|=0X00033000; GPIOA->ODR|=3<<11; //PC11,12 ?????? } //?ú?úIIC???????? void IIC_Start(void) { SDA_OUT(); //sda?????? IIC_SDA=1; IIC_SCL=1; // delay_us(4); IIC_SDA=0;//START:when CLK is high,DATA change form high to low // delay_us(4); IIC_SCL=0;//??×?I2C×?????×?±?·????ò???????? } //?ú?úIIC???????? void IIC_Stop(void) { SDA_OUT();//sda?????? IIC_SCL=0; IIC_SDA=0;//STOP:when CLK is high DATA change form low to high // delay_us(4); IIC_SCL=1; IIC_SDA=1;//·???I2C×????á?????? // delay_us(4); } //???????????????? //·???????1???????????§°? // 0?????????????? u8 IIC_Wait_Ack(void) { u8 ucErrTime=0; SDA_IN(); //SDA?è???????? IIC_SDA=1;delay_us(1); IIC_SCL=1;delay_us(1); while(READ_SDA) { ucErrTime++; if(ucErrTime>250) { IIC_Stop(); return 1; } } IIC_SCL=0;//?±??????0 return 0; } void IIC_Send_Byte(u8 txd) { u8 t; SDA_OUT(); IIC_SCL=0;//?????±?????????????? for(t=0;t<8;t++) { IIC_SDA=(txd&0x80)>>7; txd<<=1; delay_us(2); //??TEA5767?????????±????±????? IIC_SCL=1; delay_us(2); IIC_SCL=0; delay_us(2); } IIC_Wait_Ack(); } [/mw_shl_code]

SSD1306的IIC数据写入函数

[mw_shl_code=c,true]void SSD1306_init() { IIC_Init(); RCC->APB2ENR|=1<<2; //????PORTA?±?? GPIOA->CRH&=0X0FFFFFFF; GPIOA->CRH|=0X30000000; GPIOA->ODR|=1<<15; RES=0; delay_ms(1000); RES=1; OLED_WriteCmd(0xAE); /*display off*/ OLED_WriteCmd(0x00); /*set lower column address*/ OLED_WriteCmd(0x12); /*set higher column address*/ OLED_WriteCmd(0x00); /*set display start line*/ OLED_WriteCmd(0xB0); /*set page address*/ OLED_WriteCmd(0x81); /*contract control*/ OLED_WriteCmd(0x1f); /*128*/ OLED_WriteCmd(0xA1); /*set segment remap*/ OLED_WriteCmd(0xA6); /*normal / reverse*/ OLED_WriteCmd(0xA8); /*multiplex ratio*/ OLED_WriteCmd(0x1F); /*duty = 1/32*/ OLED_WriteCmd(0xC8); /*Com scan direction*/ OLED_WriteCmd(0xD3); /*set display offset*/ OLED_WriteCmd(0x00); OLED_WriteCmd(0xD5); /*set osc division*/ OLED_WriteCmd(0x80); OLED_WriteCmd(0xD9); /*set pre-charge period*/ OLED_WriteCmd(0x1f); OLED_WriteCmd(0xDA); /*set COM pins*/ OLED_WriteCmd(0x12); OLED_WriteCmd(0xdb); /*set vcomh*/ OLED_WriteCmd(0x40); OLED_WriteCmd(0x8d); /*set charge pump enable*/ OLED_WriteCmd(0x14); OLED_WriteCmd(0xAF); /*display ON*/ }[/mw_shl_code]

[mw_shl_code=c,true]u8 OLED_WriteCmd(u8 Cmd) { IIC_Start(); IIC_Send_Byte(0x78); IIC_Send_Byte(0x00); IIC_Send_Byte(Cmd); IIC_Stop(); return 0; } u8 OLED_WriteData(u8 Data) { IIC_Start(); IIC_Send_Byte(0x78); IIC_Send_Byte(0x40); IIC_Send_Byte(Data); IIC_Stop(); return 0; }[/mw_shl_code] [mw_shl_code=c,true] [mw_shl_code=c,true]void OLED_SetXY(u8 x,u8 y) { OLED_WriteCmd(0xb0+y);//?? OLED_WriteCmd(((0xf0&x)>>4)|0x10);//?????? OLED_WriteCmd((0x0f&x)|0x01);//?????? }[/mw_shl_code] [mw_shl_code=c,true]void OLED_Fill(unsigned char bmp_dat) { unsigned char y,x; for(y=0;y<4;y++) { OLED_WriteCmd(0xb0+y); OLED_WriteCmd(0x01); OLED_WriteCmd(0x10); for(x=0;x<127;x++) OLED_WriteData(bmp_dat); } } [/mw_shl_code] [/mw_shl_code]

是不是很简单，但是在实际测试的时候，出现了一个问题就是能点亮，但是就是不按照自己的要求显示，最后发现是硬件上，在RST引脚需要用一个电容与GND连接