Dear Forum,
I hope someone could comment on "best practice" advice for a problem I recently encountered. I experienced interrupt handler callbacks not running when the corresponding interrupt was triggered due to using #define to "rename" interrupt handler functions, and then forgetting to #include the header file containing the relevant #define's.
It was a silly error but remained a mystery for sometime because neither compiler nor linker generated any errors or warnings (which might be because the IRQ Handler functions are declared as '__weak' so the definitions can be overwritten in user files, but I'm not sure).
To be clear, here is an example in which DMA is used for USART transfers and I "rename" the DMA Channel IRQ handler (to make it easier to change USART or DMA channel later).
My interrupt handler function definition would be in stm32l4_it.c like this:
// This function handles DMA Tx interrupt request void USART_DMA_TX_IRQHandler(void) { HAL_DMA_IRQHandler(USART_DMA_Handle.hdmatx); }
And then in main.h I have the #define for this function name:
#define USART_DMA_TX_IRQHandler DMA1_Channel2_IRQHandler
In my case I forgot to #include "main.h" in the stm32l4_it.c file. The compiler/linker did not generate any warning or error about a function without a declaration or there being a definition for something that is not used. The error would be that the handler USART_DMA_TX_IRQHandler() would never be called (and consequently DMA transfer stays in a busy state because the transfer interrupt is not cleared).
What is a better method for "renaming" IRQ handlers and making sure the compiler/linker will catch the type of mistake made here?
Will appreciate some suggestions!
Thanks!