A DSP/BIOS (HWI/SWI) problem on OMAP-L137

Zuofei Wang said:

1. In my program, I tried to post an SWI in an HWI. The problem is: Neither in the HWI nor SWI can I use the functions related to heap, such as printf(), malloc(). Program will stuck when it runs to such functions. I've allocated enough heap size in the BIOS configuration and I can use printf() in the main() function.

You can not call printf from a SWI or HWI. Please see:

http://tiexpressdsp.com/index.php/DSP_BIOS_FAQ#Q:_Can_runtime_support_.28RTS.29_functions_be_called_when_using_DSP.2FBIOS.3F

You could use Log_printf instead:

http://tiexpressdsp.com/index.php/DSP_BIOS_FAQ#Q:_How_can_I_convert_printf.28.29_statements_to_LOG_printf.28.29.3F

Zuofei Wang said:

2. When I disabled the dispatcher for HWI, the printf() can be run in HWI. However, the SWI cannot be posted by HWI at this time. I have to add the keyword "interrupt" before my ISR function when I disable the dispatcher.

when you are not using the dispatcher you need to have the interrupt key word, but then you are not using the DSP/BIOS dispatcher.

http://tiexpressdsp.com/index.php/DSP_BIOS_Debugging_Tips#Cause:__Improper_use_of_the_interrupt_keyword

Thank you for the quick reply.

Actually I don't have to call printf() from a SWI, but I need to call malloc()/calloc() for dynamic memory allocation. I tried calling malloc() in a TASK, and it was not working as well. Does that mean none of the RTS functions could be used in a HWI/SWI/TASK?