Im trying to find out how I can disable and enable interrupts on the STM32L4x6RG Nucleo?
After a bit of googling I found the macros __disble_irq() and __enable_irq() but I'm not convinced these are disabling interrupts.
After more investigation it seems that the cpsid instruction this macro maps to only has effect when it runs in supervisor context. So the question becomes how do I move to supervisor mode to disable interrupts and back again??
The processor boots in privileged mode so unless you are running your application on top of an operating system or have switched to unprivileged mode yourself you should already be in privileged mode. If you are running you application on top of an OS you should use its services to handle interrupts and if no such service exists you should leave the interrupts alone.
If you have switched to unprivileged-mode yourself, you can use the svc instruction to trigger an svc-exception and the handler for the exception executes in privileged mode.