Hello,
I am using a nrf52 DK in an educational context.
For this reason, I am not using the SDK, but implement basic features on a lower level.
I used the implementation in nrfx_spi.c from SDK17.0.2_d674dde as reference.
Before I provide a minimal code example and such, I would like to verify if my approach should in theory work.
Initialization:
1. Disable SPI
2. Configure SCK, MOSI, MISO pins
3. Set cpol,cpha, order bits in config-register
4. Set frequency register
5. Set miso, mosi and sck register to specify used pins
6. Enable SPI
Next, I want to measure, if either the clock, or the Mosi pin behave correctly, therefore I use a basic send_byte function:
send_byte:
1. Read last byte from RXD-register
2. Clear the spi-event-register (This should already be cleared by the read instruction?)
3. Write a byte in the TXD-register
If I now use the send_byte function in a loop without delays, should I be able to measure a signal on either the MOSI or SCK pin?
The only behaviour I am currently getting, is that the SCK pin goes high after I am using the send_byte function for the first time.
The pin does not change its level afterwards.
Would greatly appreciate some help!
