有木有人 改写过官方的I2C库函数~

 



void DrcI2C_WriteByte(uint32_t address,uint8_t data )

{

uint32_t i;

SystemCoreClock = DrvSYS_GetHCLKFreq(); 

  //Open I2C1 and set clock = 50Kbps 

if(DrvI2C_Open(I2C_PORT1, 50000))

  printf("Open i2c1 fail.\n");



    //send i2c start

DrvI2C_Ctrl(I2C_PORT1, 1, 0, 0, 0); //set start

while (I2C1->I2CON.SI == 0);   //poll si flag

//send writer command

I2C1->I2CDAT = 0x78;     //send writer command

    DrvI2C_Ctrl(I2C_PORT1, 0, 0, 1, ); //clr si flag

    while( I2C1->I2CON.SI == 0 );      //poll si flag

// //send address high

// I2C1->I2CDAT = (address>>8)&0XFF; 

// DrvI2C_Ctrl(I2C_PORT1, 0, 0, 1, 1); //clr si and set ack 

// while( I2C1->I2CON.SI == 0 );   //poll si flag

// //send address low

// I2C1->I2CDAT = address&0XFF; 

// DrvI2C_Ctrl(I2C_PORT1, 0, 0, 1, 1); //clr si and set ack 

// while( I2C1->I2CON.SI == 0 );   //poll si flag

//send data

I2C1->I2CDAT = data;     //write data to 

DrvI2C_Ctrl(I2C_PORT1, 0, 0, 1, 1); //clr si and set ack 

while( I2C1->I2CON.SI == 0 );   //poll si flag

    //send i2c stop

DrvI2C_Ctrl(I2C_PORT1, 0, 1, 1, 0); //send stop 

while( I2C1->I2CON.STO);

//while( I2C1->CON.SI == 0 );

for(i=0;i<60;i++);

DrvI2C_Close(I2C_PORT1);

   

for(i=0;i<6000;i++);

for(i=0;i<6000;i++);

}

uint8_t DrcI2C_ReadByte(uint32_t address)

{

uint8_t TEMP;

  //Open I2C1 and set clock = 50Kbps

SystemCoreClock = DrvSYS_GetHCLKFreq(); 

DrvI2C_Open(I2C_PORT1, 50000);

//send i2c start

    DrvI2C_Ctrl(I2C_PORT1, 1, 0, 1, 0);   //set start

while (I2C1->I2CON.SI == 0);    //poll si flag

  

    //send writer command

I2C1->I2CDAT = 0XA0;

    DrvI2C_Ctrl(I2C_PORT1, 0, 0, 1, 0);    //clr si

    while( I2C1->I2CON.SI == 0 );      //poll si flag



//send address high

    I2C1->I2CDAT = (address>>8)&0XFF; 

DrvI2C_Ctrl(I2C_PORT1, 0, 0, 1, 1);    //clr si and set ack

while( I2C1->I2CON.SI == 0 );      //poll si flag

    

//send address low

I2C1->I2CDAT = address&0XFF; 

DrvI2C_Ctrl(I2C_PORT1, 0, 0, 1, 0);    //clr si and set ack

while( I2C1->I2CON.SI == 0 );      //poll si flag



//send start flag

DrvI2C_Ctrl(I2C_PORT1, 1, 0, 1, 0);    //clr si and send start 

while( I2C1->I2CON.SI == 0 );      //poll si flag



//send read command

I2C1->I2CDAT = 0XA1;

DrvI2C_Ctrl(I2C_PORT1, 0, 0, 1, 1);    //clr si

    while( I2C1->I2CON.SI == 0 );      //poll si flag

//resive data

I2C1->I2CDAT = 0XFF;

DrvI2C_Ctrl(I2C_PORT1, 0, 0, 1, 0);    //clr si 

while( I2C1->I2CON.SI == 0 );      //poll si flag

TEMP= I2C1->I2CDAT;

//send i2c stop

  DrvI2C_Ctrl(I2C_PORT1, 0, 1, 1, 0);    //clr si and set stop

while( I2C1->I2CON.STO);

DrvI2C_Close(I2C_PORT1);

return TEMP; 

}



这.......看着就蛋疼



比较一下STM32的







[code]uint8_t I2C_7588lcd_Write(u8* pBuffer, u8 WriteAddr, u8 NumByteToWrite)

{

unsigned int i;

uint32_t u32delayno;



I2C_GenerateSTART(I2C_MASTER, ENABLE); //启动I2C



u32delayno=0;

while(!I2C_CheckEvent(I2C_MASTER, I2C_EVENT_MASTER_MODE_SELECT)); //等待响应，超时退出，放置死循 

//发送器件地址

I2C_Send7bitAddress(I2C_MASTER, 0x78, I2C_Direction_Transmitter);



u32delayno=0;

while(!I2C_CheckEvent(I2C_MASTER, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)) //等待器件响应

{

u32delayno++; 

if ( u32delayno >= I2C_TIME_OUT )

{ 

USART1_Puts("error:send address\n"); 

return ERROR;

} 

} 

while(NumByteToWrite--) 

{ //写数据



I2C_SendData(I2C_MASTER, *pBuffer); 

//发送数据

pBuffer++; 



for(i=50;i>0;i--) //等待器件响应 LCD答应ACK有点BUG所以这里采用延时

{

__nop();

}



} 

I2C_GenerateSTOP(I2C_MASTER, ENABLE);

//停止I2C

return SUCCESS;



}