Driver getting stuck at NVIC_EnableIRQ(UARTE0_UART0_IRQn);

[EarthLord]

Greetings,

A very bizarre thing is happening. This is the umpteenth time I'm working on a peripheral driver and the code gets stuck at 'NVIC_EnableIRQ(UARTE0_UART0_IRQn);'

The value of UARTE0_UART0_IRQn is 2. Any other value that I put in as an argument works and the program proceeds properly.

I've checked that its not going to any exception handler. What can be the reason for this? Also what other information can I provide to help diagnose this?

Thanks in advance, Prithvi

[Vidar Berg]

Hi,

Have you defined the exception handler for UARTE0 in your code (UARTE0_UART0_IRQn )?  Also,  maybe you could post a screenshot showing the CPU registers when the program hangs? I want to confirm if the program is in an interrupt context even though it didn't enter any exception handler (last bits of PSR registers holds the current ISR number). 

Best regards,

Vidar

[EarthLord]

Thanks Vidar for the pointer to check. I used GDB to narrow the issue. It was caused by a typo when setting INTENSET. I used

(UARTE_INTENSET_ENDRX_Enabled | UARTE_INTENSET_ENDRX_Pos)

instead of

(UARTE_INTENSET_ENDRX_Enabled << UARTE_INTENSET_ENDRX_Pos)

Aaargh. Fixed and working now. Thanks again.