RP2040Sdio interaction with pwmIRQ

[lhm0]

I am using the RP2040 SDIO extension of SdFat successfully,. However as soon as I run PWM IRQs in parallel, I run into trouble.

Both lines

pwm_clear_irq(0);
pwm_set_irq_enabled(0, true);

bring the SD card read operations to a halt.

I presume that SDIO uses interrupts as well. What are the limitations?

Your help would be highly appreciated.

Best regards, Ludwin

[lhm0]

Here is what I found:

The problem was an interaction of my ISR with SdFat-beta > src > SdCard > RP2040Sdio > PioSdioCard. I am also using one of the RP2040 pio blocks. My ISR writes data into the pio FIFO.

Anyhow, I did not properly check whether the pio block was free, which resulted in using the same block, as SdFat.

I added a pio_can_add_program() check (learnt from you), and everything works fine.