Posted on May 05, 2014 at 23:14Yay! I've got this working pretty well. My biggest problem was that the address of the sensor is x48 and I know it is 7 bit but I did not realize that it needs to be left justified before I call I2C_Send7bitAddress. So, I need to send a x90.
My last remaining problem is that the register I'm reading is 16 bit and I can't quite figure out how to use the std periph library functions to clock in that second byte. I don't need to send the bus address again or the register address, just need to clock in 8 more bits.
Code looks like this after it gets the high byte.
/* Receive high byte of Data */
data_high = I2C_ReceiveData(I2C1);
// Read low byte of Data
/* Prepare an NACK for the next data received */
I2C_AcknowledgeConfig(I2C1, DISABLE);
/* Test on I2C1 EV7 and clear it */
timeout = ADT7410_TIMEOUT_MAX; /* Initialize timeout value */
while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED))
{
/* If the timeout delay is exeeded, exit with error code */
if ((timeout--) == 0)
{
return ERROR;
}
}
/* Receive the Data */
data_low = I2C_ReceiveData(I2C1);
// Build 16 bit data word
*read_data = (uint16_t) data_high;
*read_data <<= 8;
*read_data += (uint16_t) data_low;
I2C_GenerateSTOP(I2C1, ENABLE);
/* return the read data */
return SUCCESS;
but it times out and I don't see that second transfer on the scope so I must not be calling I2C_CheckEvent correctly or something like that.
I'd appreciate any ideas.
Mike
