I2C NACK

[stafvg]

When you want to use de maxim DS1632 (thermometer) you need a NACK. But in Flowcode I see a start a stop an ack ... but not a NACK. So how can I generate a NACK in flowcode ?

[Sean]

An I2C device only generates an ACK or NACK signal when it has received data. In flowcode the MI2C_Receive_Byte function uses the 'Last(BYTE)' parameter to control the ACK/NACK signal.

If 'Last' is set to zero, an ACK signal is transmitted (data line low) for the clock cycle after a data byte is received.
If 'Last' is not zero, a NACK signal is transmitted (data line high) for the clock cycle after a data byte is received.

The ACK or NACK signal received from the slave device after writing to it using the MI2C_Transmit_Byte function is available as the 'Return Value:(BYTE)'

[stafvg]

Thank you for this anwer.
But I was asking myself, where can I find a help on these macro ? I mean, I find in the help how I can make my own macro, but I can't find any helpinformation concerning this I2C macro's. Is it me or is this information not in the help ?

[Benj]

Hello

Click on the drop down on the I2C component. Then click on properties. Then click on Help.

Or you can browse to the Flowcode V3 folder and open the I2C.hlp file.

[stafvg]

Thanks, I'm finding my way now trough the helpfunction !