How to enable and disable all interrupts ?

[Milan]

Hi Team,

Is there any way to enable/disable all interrupts? Will BLE connection get disconnected because of this? If yes the what are the possible ways to maintain the connection?

[RK]

1. Is there a way to enable/disable all interrupts. Yes, set primask. There's a __disable_irq() and an __enable_irq() macro to do that .. however
2. Will BLE connection get disconnected because of this? Yes, it will, perhaps not instantly, perhaps not every time. The longer you have them disabled, the more likely the SD will break that time but even if you have them disabled for a really, really short time, it will eventually and randomly break. So don't use the __disable_irq() or attempt to disable all interrupts. It will not work.
3. What are the possible ways to maintain the connection? Don't disable all interrupts is the way to maintain the connection. You can use the sd_nvic_critical_region_enter()/exit() functions to turn off all interrupts the softdevice isn't using. That is the most you can do.

What problem are you actually trying to solve?

[Milan]

I need to implement software uart i.e. uart bitbang and in which I need to require disable interrupts except the timer interrupt which is handling either TX or RX at a time. Can you tell me how to this could be achieved? What is the max time period for which i can disable required interrupts and then resume again so that it won't hurt the ble connection?

Say i need to send 8 bytes of data @9600 baud rate and I need to disable few other interrupts in ble_uart_app will ble remain in connection?