How can I avoid sending a repeated start between TWI write and TWI read?

[Noah]

I am communicating with a temperature sensor (MLX90614), which has flag register. However, in order to read this register, I must send a read sequence without issuing the repeated start between the write and read operations. Here is what I want to do in a step-by-step approach:

1. Send start
2. Send the slave address ID with the nWrite bit low (8 bits)
3. Receive an ACK from the slave
4. Send out the command to read the flags, 0xF0 (8 bits)
5. Receive an ACK from the slave
6. Do not send a repeated start. (Normally, there would be a repeated start here).
7. Send the slave address with the nWrite bit high, indicating a read (8 bits)
8. Send out 16 bits of clock to read in the MSB and LSB from the slave, placing ACKs appropriately.

9. Issue a stop.

I think that I need to use GPIOTE with PPI to get this to work, but do not know how to specify the number of toggles that would be needed to describe the event. And upon describing the event, what action should be taken.

Can someone advise?

Thank you,

Noah

[Ole Bauck]

Why don't you use the driver in the SDK; nrf_drv_twi? If the no_stop flag in nrf_drv_tx(..) is false it should not issue a repeated start condition.