Hello Guys,
I am interfacing MPC5604C with some sensor using I2C.
when I send a slave address data..
I can see the start signal going properly on the line,
but after that both the lines will be low and if I send a slave address I am not seeing anything on the SDA line.
what might be the wrong thing I'm doing?
please share if anyone has a code for it.
Details:
-> I2C clock 400kbps
-> PB2 - SDA line
PB3 - SCL line
/************* I2C init code ****************************/
SIU.PSMI[29].R = 0x01;
/*Function Pad Selected I2C_SCL :- PCR19*/
SIU.PSMI[30].R = 0x01;
/*Function Pad Selected I2C_SDA :- PCR18*/
/* Configure I2C PCR register to Select I2C functionality */
SIU.PCR[18].R = 0x0B20; /* select SDA line */
SIU.PCR[19].R = 0x0A20; /* select SCL line */
/*****************************************************************************/
void I2CStart(void)
{
I2C.IBCR.B.MS = 0;
I2CDelay();
I2C.IBCR.R |= 0x30;/* Master,Transmit set to 1 */
}
/*****************************************************************************/
Bool I2CWrtByte(uint8_t Byte)
{
I2C.IBDR.R = (uint8_t)Byte;
while(!((I2C.IBSR.B.TCF) & (I2C.IBSR.B.IBIF)))
{
/* Wait for transfer to complete */
}
/* Check ACK bit - generate stop seq in case of error */
if(I2C.IBSR.B.RXAK)
{
return FAILURE; /* NoAck */
}
else
{
return SUCCESS; /* Ack received */
}
}/* End of I2CWrtByte function */
/*****************************************************************************/
Bool I2CWrite(uint8_t slaveaddrs, uint8_t wordaddrs,uint8_t *data, uint32_t data_len)
{
Bool Status_u8 = SUCCESS, DataLenCount_u32,Byte_u8;
/* Clear IBSR[IBIF] */
I2C.IBSR.B.IBIF = 0;
if(!I2C.IBSR.B.IBB)
{
/* Send a start condition */
I2CStart();
/* Send the I2C address of the slave with the R/W bit low */
Byte_u8 = (uint8_t)((slaveaddrs << 1) & 0xFE);
Status_u8 = I2CWrtByte(Byte_u8);
/* check the Ack */
if(Status_u8 == FAILURE)
{
return FAILURE;
}
else
{
/* send the word address */
Status_u8 = I2CWrtByte(wordaddrs);
if(Status_u8 == FAILURE)
{
return FAILURE;
}
else
{
for(DataLenCount_u32 = 0; DataLenCount_u32 < data_len; DataLenCount_u32++)
{
Status_u8 = I2CWrtByte(data[DataLenCount_u32]);
if(Status_u8 == FAILURE)
{
break;
}
}
}
}
if(data_len != 0)
I2CStop();
}
else
{
Status_u8 = FAILURE;
}
/* Clear IBSR[IBIF] */
I2C.IBSR.B.IBIF = 0;
return Status_u8;
}
