topic Re: Switch debug console non-blocking to blocking in hardfault in LPC Microcontrollers

Switch debug console non-blocking to blocking in hardfault

LarryZ — Fri, 02 Feb 2024 15:08:08 GMT

I am using the non-blocking configuration of the debug console (DEBUG_CONSOLE_TRANSFER_NON_BLOCKING) because I need to be able to poll for input without blocking. However, I would like to output information from my hardfault handler. Is there a way within the debug console to cause buffered output to be transferred out of the debug console UART while in a hardfault (which blocks interrupts)? In previous projects, I have directly called the UART's ISR until the output buffer was empty, but it seems like there should be a way to do it within the fsl_debug_console library.

Re: Switch debug console non-blocking to blocking in hardfault

xiangjun_rong — Sun, 04 Feb 2024 04:31:49 GMT

Hi,

I suppose that the hardfault event is not an interrupt event, it is an exception event, I suppose that you can not output char in the ISR of hardfalut via uart.

Hope it can help you

XiangJun Rong

Re: Switch debug console non-blocking to blocking in hardfault

LarryZ — Tue, 06 Feb 2024 13:03:01 GMT

Re: Switch debug console non-blocking to blocking in hardfault

xiangjun_rong — Tue, 06 Feb 2024 03:03:55 GMT

Hi,

can you tell us the part number you are using?

XiangJun Rong

Re: Switch debug console non-blocking to blocking in hardfault

LarryZ — Tue, 06 Feb 2024 13:00:57 GMT

It's a LPC55S69JBD64K.

And, just to be clear, the solution of calling the interrupt handler has the desired effect, it just feels like a bit of a kludge so I would prefer to use a method built into the fsl debug console library.

Re: Switch debug console non-blocking to blocking in hardfault

LarryZ — Tue, 06 Feb 2024 13:02:00 GMT

Right - it's an exception, which means interrupts are not allowed. I know I can call FLEXCOMM7_DriverIRQHandler() every mS or so (I am using Flex Comm 7 for the console port), but I was hoping there might be an official way to do it within the FSL library.