I am having the same problem as in
devzone.nordicsemi.com/.../nrf52840_dk-spi-configuration
I am using nRF5340.
The problem I'm facing is that when i hook up my logic analyzer it shows no activity except for the SCK/clock line. The clock line starts every time spi_transcieve() is run but the other lines(MISO, MOSI and CS) shows no activity.
Hope to see a working example of SPI on nrf5340 or find the solution of
Hello Øivind,
The SPI works, but it is a bit slow as indicated by the timing of the signals on the SPI bus. In 101uS between the falling edge and rising edge of CS, almost 60uS waiting time after the slave had finished putting data on the bus. There seems to be room for optimization in Zephyr SPI code.
I wrote a sw bitbanging version of SPI driver using GPIO pins and it is faster the Zephyr SPI driver. 62 uS vs 102 uS, so Zephyr SPI has problem. It just can't be slower than sw bitbanging.
<---- This is Zephyr SPI. It takes 102 uS. Slower than sw bigbanging using GPIO.
