[菜农群课笔记] 【第三期】I2C的操作.查询，中断.各种操作！

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 state

DrvI2C_Ctrl(I2C_PORT1, 1, 0, 0, 0); //设置开始

while (I2C1->I2CON.SI == 0); //等待... 



I2C1->I2CDAT = 0xA0; //发送器件地址

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

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



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

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++);

}



void DrcI2C_WriteData(uint32_t address,uint8_t *pBuffer ,uint32_t u32Num)

{

uint32_t i;

SystemCoreClock = DrvSYS_GetHCLKFreq(); 



if(DrvI2C_Open(I2C_PORT1, 50000)) //Open I2C1 and set clock = 50Kbps 

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 = address; //send writer command

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

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



while(u32Num--)

{

//send data

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

pBuffer++;

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; 

}

#include "DrvI2C_Int.h"



volatile I2C_HOT_T I2C1s;







void I2C1_INT_HANDLE (uint32_t status)

{

switch(status & 0xf8) 

{

case I2C_START: //主机收到自己发送的开始信号

{ 

if(I2C1s.State == I2C_START)

{ //本次中断应该接收TW_START信号

I2C1->I2CDAT = I2C1s.u8SetAddress & 0xfe; //发送子机地址(写)

DrvI2C_Ctrl(I2C_PORT1, 0, 0, 1, 0); //STA位必须清除，否则死机 清除中断标志

I2C1s.State = I2C_MT_SLA_ACK; //Status下次I2C_MT_SLA_ACK

}

else

I2C_Exit(); //通讯失败

break;

}



case I2C_REP_START: //主机收到自己发送的重新开始信号

{ 

if (I2C1s.State == I2C_REP_START)

{ //本次中断应该接收TW_RESTART信号

I2C1->I2CDAT = I2C1s.u8SetAddress; //发送子机地址(读)

I2C1s.State = I2C_MR_SLA_ACK; //Status下次I2C_MR_SLA_ACK

DrvI2C_Ctrl(I2C_PORT1, 0, 0, 1, 1); //STA位必须清除，否则死机 清除中断标志

}

else

I2C_Exit(); //通讯失败

break;

}



case I2C_MT_SLA_ACK:

{ //主发机接收到从机的地址应答信号后发送命令

if(I2C1s.State == I2C_MT_SLA_ACK) 

{ //本次中断应该接收TW_MT_SLA_ACK信号

I2C1s.State = I2C_MT_DATA_ACK; //Status下次应该收TW_MT_DATA_ACK

I2C1->I2CDAT = I2C1s.SubComm; //发送子机命令

DrvI2C_Ctrl(I2C_PORT1, 0, 0, 1, 1);

}

else

I2C_Exit(); //通讯失败

break;

}



case I2C_MR_SLA_ACK:

{ //主收机接收到从机的地址应答信号

if ((I2C1s.State == I2C_MR_SLA_ACK) && I2C1s.u32SubCount)

{ //本次中断应该接收TW_MR_SLA_ACK信号

I2C1s.State = I2C_MR_DATA_ACK; //Status下次应该收TW_MR_DATA_ACK

DrvI2C_Ctrl(I2C_PORT1, 0, 0, 1, 1);

}

else

I2C_Exit(); //通讯失败

break;

}

case I2C_MT_DATA_ACK:

{ //主收机接收到从机的数据应答信号

if ((I2C1s.State == I2C_MT_DATA_ACK) && (I2C1s.u32Count < I2C1s.u32MasterCount))

{ //本次中断应该接收TW_MT_DATA_ACK信号

I2C1->I2CDAT= I2C1s.u32TxBuffer[I2C1s.u32Count ++]; //发送子机数据

DrvI2C_Ctrl(I2C_PORT1, 0, 0, 1, 1);

}

else 

{

if ((I2C1s.State == I2C_MT_DATA_ACK) && 

(I2C1s.u32Count == I2C1s.u32MasterCount) && 

(I2C1s.u8SetAddress & 0x01))

{ //本次中断应该接收TW_MT_DATA_ACK信号

I2C_REStart();//

}

else 

I2C_Stop(); //通讯成功

}

break;

}

case I2C_MR_DATA_ACK:

{

if ((I2C1s.State == I2C_MR_DATA_ACK) && (I2C1s.u32Count < I2C1s.u32SubCount))

{

I2C1s.u32TxBuffer[I2C1s.u32Count ++] = I2C1->I2CDAT;//接收子机数据

if (I2C1s.u32Count < I2C1s.u32SubCount)

{

DrvI2C_Ctrl(I2C_PORT1, 0, 0, 1, 1);

}

else 

{

DrvI2C_Ctrl(I2C_PORT1, 0, 0, 1, 0);

I2C1s.State = I2C_MR_DATA_NACK; //下次进入I2C_MR_DATA_NACK，接收数据准备完成

}

}

else

I2C_Exit(); //通讯失败

break;

}

case I2C_MR_DATA_NACK: //数据接收结束

{

if((I2C1s.State == I2C_MR_DATA_NACK) && (I2C1s.u32Count == I2C1s.u32SubCount)) 

{

I2C_Stop(); //通讯成功

}

else 

I2C_Exit(); //通讯失败

break;

}



default:

I2C_Exit(); //通讯失败

}

}



void Init_I2C(void)

{

/* Set I2C I/O */

DrvGPIO_InitFunction(E_FUNC_I2C1);

I2C1s.u8SetAddress = 0xA0;

}



void I2C_Start(void)

{

I2C1s.Busy = TRUE;

I2C1s.State = I2C_START; //主机准备发送启始位

I2C1s.u32Count = 0; //发送数据个数

//SystickCount = 0; //清除节拍计数器



/* Open I2C1, and set clock = 50Kbps */

DrvI2C_Open(I2C_PORT1,50000);



/* Enable I2C1 interrupt and set corresponding NVIC bit */

DrvI2C_EnableInt(I2C_PORT1);



/* Install I2C1 call back function for slave */

DrvI2C_InstallCallback(I2C_PORT1, I2CFUNC, I2C1_INT_HANDLE);



DrvI2C_Ctrl(I2C_PORT1, 1, 0, 0, 0);



DrvSYS_Delay(8000);

}



void I2C_REStart(void)

{

I2C1s.Busy = TRUE;

I2C1s.State = I2C_REP_START; //主机准备发送启始位

I2C1s.u32Count = 0; //发送数据个数

DrvI2C_Ctrl(I2C_PORT1, 1, 0, 1, 0);

}





void I2C_Stop(void)

{

I2C1s.Busy= FALSE;

I2C1s.State = I2C_BUS_OK; //通讯成功

DrvI2C_Ctrl(I2C_PORT1, 0, 1, 1, 0);

}



void I2C_Exit(void)

{

I2C1s.Busy = FALSE;

I2C1s.State = I2C_BUS_ERROR; //通讯失败

DrvI2C_Ctrl(I2C_PORT1, 0, 1, 1, 0);



printf("I2C talk is fail.\n");

}





unsigned char I2C_ReadByte(unsigned int Address, unsigned char *Data)

{

I2C1s.u8SetAddress |= 0x01;

I2C1s.u32MasterCount = 0; //发送0个数据(只读)

//本程序为通用I2C,故发送器件后一般为命令，对EEPROM来说，命令实际是EEPROM地址

I2C1s.SubComm = Address; //读出地址

I2C1s.u32SubCount = 1; //接收1个数据

I2C_Start(); //启动I2C模块

if (I2C1s.State == I2C_BUS_OK) //通讯成功

{ 

Data[0] = I2C1s.u32TxBuffer[0]; //从接收缓冲区取出一个字节

}

return I2C1s.State; //(读出数据在RxBuffer[0]~RxBuffer[15])

}

//本程序为通用I2C,故发送器件后一般为命令，对EEPROM来说，命令实际是EEPROM地址

unsigned char I2C_ReadBuffer(unsigned int Address, unsigned char *Data, unsigned int Cnt)

{

int i;

I2C1s.u8SetAddress |= 0x01;

I2C1s.u32MasterCount = 0; //发送0个数据(只读)



I2C1s.SubComm = Address; //读出地址

I2C1s.u32SubCount = (Cnt <= sizeof(I2C1s.u32TxBuffer)) ? Cnt : sizeof(I2C1s.u32TxBuffer);//接收Cnt个数据

I2C_Start(); //启动I2C模块

if (I2C1s.State == I2C_BUS_OK)

{ //通讯成功

for (i = 0; i < I2C1s.u32SubCount; i ++) 

Data[i] = I2C1s.u32TxBuffer[i]; //从接收缓冲区取出Cnt个字节

}

return I2C1s.State; //(读出数据在RxBuffer[0]~RxBuffer[15])

}

//本程序为通用I2C,故发送器件后一般为命令，对EEPROM来说，命令实际是EEPROM地址

unsigned char I2C_WriteByte(unsigned int Address, unsigned char Data)

{

I2C1s.u8SetAddress &=0xfe;

I2C1s.u32MasterCount = 1; //发送1个数据



I2C1s.SubComm = Address; //写入地址

I2C1s.u32TxBuffer[0] = Data; //写入1个数据到发送缓冲区

I2C1s.u32SubCount = 0; //接收0个数据

I2C_Start(); //启动I2C模块

DrvSYS_Delay(100);

return I2C1s.State;

}







//本程序为通用I2C,故发送器件后一般为命令，对EEPROM来说，命令实际是EEPROM地址

unsigned char I2C_WriteBuffer(unsigned int Address, unsigned char *Data, unsigned int Cnt)

{

int i;

I2C1s.u8SetAddress &= 0xfe; //发送Cnt个数据

I2C1s.u32MasterCount =Cnt ;





I2C1s.SubComm = Address; //写入地址



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

{ 

I2C1s.u32TxBuffer[i] = Data[i]; //写入Cnt个数据到发送缓冲区

}

I2C1s.u32SubCount = 0; //接收0个数据

I2C_Start(); //启动I2C模块

DrvSYS_Delay(100);

return I2C1s.State;

}