[mw_shl_code=c,true]#include "myiic.h" #include "delay.h" //??????IIC void IIC_Init(void) { GPIO_InitTypeDef GPIO_InitStructure; RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);//????GPIOB?±?? //GPIOB8,B9???????è?? GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;//???¨???????? GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//???ì???? GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHz GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;//???? GPIO_Init(GPIOB, &GPIO_InitStructure);//?????? IIC_SCL=1; IIC_SDA=1; } //?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; } //?ú?úACK???? void IIC_Ack(void) { IIC_SCL=0; SDA_OUT(); IIC_SDA=0; delay_us(2); IIC_SCL=1; delay_us(2); IIC_SCL=0; } //???ú?úACK???? void IIC_NAck(void) { IIC_SCL=0; SDA_OUT(); IIC_SDA=1; delay_us(2); IIC_SCL=1; delay_us(2); IIC_SCL=0; } //IIC·???????×??? //·??????ú???????? //1???????? //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_SDA=1; delay_us(2); IIC_SCL=1; delay_us(2); IIC_SCL=0; delay_us(2); } //??1??×?????ack=1?±??·???ACK??ack=0??·???nACK u8 IIC_Read_Byte(unsigned char ack) { unsigned char i,receive=0; SDA_IN();//SDA?è???????? for(i=0;i<8;i++ ) { IIC_SCL=0; delay_us(2); IIC_SCL=1; receive<<=1; if(READ_SDA)receive++; delay_us(1); } if (!ack) IIC_NAck();//·???nACK else IIC_Ack(); //·???ACK return receive; } void CH452_Write(unsigned int cmd) //???ü?? { IIC_Start(); /*????×???*/ IIC_Send_Byte(((unsigned char)(cmd>>7)&CH452_I2C_MASK)|CH452_I2C_ADDR1); IIC_Send_Byte((unsigned char)cmd); /*·???????*/ IIC_Stop();; /*?á??×???*/ } unsigned char CH452_Read() { unsigned char keycode; IIC_Start(); //Send the Start Bit IIC_Send_Byte(0x61); //??°?±? keycode=IIC_Read_Byte(0); //???????? IIC_Stop(); //?á??×??? return(keycode); } void LEDS_Intial() { IIC_Init(); CH452_Read(); CH452_Write(CH452_RESET); CH452_Write(CH452_SYSON1); CH452_Write(CH452_DIG0 | 0x80); CH452_Write(CH452_DIG1 | 0x80); CH452_Write(CH452_DIG2 | 0x80); CH452_Write(CH452_DIG3 | 0x80); CH452_Write(CH452_DIG4 | 0x80); CH452_Write(CH452_DIG5 | 0x80); CH452_Write(CH452_DIG6 | 0x80); CH452_Write(CH452_DIG7 | 0x80); }[/mw_shl_code]