Hello Community,
I am trying to interact with an external SPI ADC using IMXRT1051 on a custom board.
Below is the block diagram of the hardware.
I am using FreeRTOS to build the application. Below is the block diagram of the software.
The ADC is generating interrupts on the DRDY pin at a rate of 16KHz. A GPIO interrupt gets triggered on the DRDY falling edge and raises an event via a binary semaphore. The ADC task performs an SPI polling read transaction. It does some processing and generates result on the logging UART (LPUART1) and on the communication UART (LPUART2).
The problem that I am facing is if I run ADC task + logging task, things are working fine. If I run communication task + logging task still things work good. Once all three are running I start getting hardfaults at random locations.
The hardfault occurs consistently after some 30 - 31 communication request packets arrive.
I am posting this here just to understand is this a good way to design the application. Can IMXRT handle so many interrupts at this rate?
I tried increasing the system stack size from the managed linker script section from 0x4000 to 0x8000 to even 0x10000 but still I do not see any change in the behavior.
I have tried experimenting even with the task stack sizes and I am sure that it is not overflowing. (I am printing the task stack utilization on the log UART and I am also using the vApplicationStackOverflowHook() to catch a stack overflow but both are clean).
I have also set correct interrupt priorities so that it is safe to call FreeRTOS APIs.
Please let me know your thoughts. I am using MCUXpresso for development.
