When reading the data from the ADC on the MISO line, the manufacturer specified in chapter 18.104.22.168 Data Input (DIN) and 9.5.3. RREG that while that the data is sent on the MISO line, the pi should send a 1 on the MOSI line for every bit received.
In other words, it is a full-duplex communication, and the pi, while receiving data on the MISO from the ADC, should send a series of 1 (it is called a NOP command in the datasheet) on the MOSI. See the image below from the datasheet.
Before testing, I wanted to know if this type of full-duplex communication was supported by the pigpio library. Looking at the method: spi_xfer(handle, data), I understood that method send the data and then catch the response from the selected device.
Is that correct? In that case, how can I establish this sort of full-duplex communication with the pigpio library?
Thanks in advance, Rokual
PS: in chapter 9.5.3 the datasheet says: "A no-operation command (NOP) can be used to clock out data from the device without clocking in a command." So it may not be critical, I am going to try without, but I would like to know if it is possible to do full-duplex with pigpio anyway for future projects :)