I am attempting to configure an ATSAMG55 XPlained board to drive the SPI5 port using the newer START/ASF4 method. It was easy to configure the SPI port to work using the START tool but then I tried to get the chip select to work. Some details:
On the START dashboard I added a software component for SPI using FLEXCOM5. I set this for master async mode. Based on the produced example code I made a main functions that sends out a string of characters and then delays for 1/2 sec and then repeats. I can see the clock sending out the data as expected. So far so good. I even have the callback IRQ toggling the LED on the board when the SPI transfers are completed.
Then I attempted to configure the chip select on the XPlained EXT3 port to assert during the transfers. To do this I used START and the PINMUX Configurator tab. I selected port PA5, entered a user label and set the pin mode to Peripheral IO. This does not generate a chip select that I could see on the scope.
I then tried the PINMUX Configurator tab and set the pin mode to Advanced, I set pin direction to OUT, initial level high, pull configuration off, and pin function to B. I expect this should drive the chip select but had no luck.
I was able to control the pin directly as a GPIO and see it toggle on the scope so I know I'm looking at the correct line.
Also, I was sort of able to follow some of the abstraction layers down in the code to see that it appears to set the pin mux as I expect it to.
If anyone has any ideas or suggestions, please let me know. Also, I could find very little documentation on using the newer ASF4/START but, as expected, a lot on the older ASF3 functions. Is the ASF4 really not usable yet? It generated interrupt handler conflicts for me but I have a support ticket in on that issue and also posted that in the ASF forum yesterday.
Thanks for your time.