[Microchip]/dsPIC2016. 8. 17. 03:24

dsPIC33 EVM - I2C 테스트

dsPIC33 EVM - I2C 테스트




dspic33_i2c.pdf


dsPIC33 EVM  보드의 I2C는 RG2(SCL), RG3(SDA)에 연결되어 있다.





dsPIC33 I2C 초기화 코드

void i2c_init(unsigned int Speed)

{

OpenI2C1( I2C_ON, I2C_BRG );

}




dsPIC33 I2C Read/Write 소스 코드

unsigned char i2c_read_byte(unsigned char Addr, unsigned char reg)
{
unsigned char data = 0;
unsigned char SlaveAddress = Addr;
char i2cData[10];
int DataSz;
int Index = 0;
i2cData[0] = (SlaveAddress << 1) | 0;
i2cData[1] = reg;
DataSz = 2;
StartI2C1();
IdleI2C1();
while( DataSz )
{
MasterWriteI2C1( i2cData[Index++] );
IdleI2C1();
DataSz--;
if( I2C1STATbits.ACKSTAT )
break;
}
RestartI2C1();
i2c_wait(10);
IdleI2C1();
MasterWriteI2C1( (SlaveAddress << 1) | 1 );
IdleI2C1();
data = MasterReadI2C1();
StopI2C1();
IdleI2C1();
return data;
}
void i2c_write_byte(unsigned char Addr, unsigned char reg, unsigned char data)
{
unsigned char SlaveAddress = Addr;
char i2cData[10];
int DataSz;
int Index = 0;
char status;
i2cData[0] = (SlaveAddress << 1) | 0;
i2cData[1] = reg;
i2cData[2] = data;
DataSz = 3;
StartI2C1();
IdleI2C1();
while( DataSz )
{
MasterWriteI2C1( i2cData[Index++] );
IdleI2C1();
DataSz--;
if( I2C1STATbits.ACKSTAT )
break;
}
StopI2C1();
IdleI2C1();
}






















dsPIC33 EVM을 이용한 I2C 온습도 센서 테스트 예제



Posted by nexp

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