Hi all,
My configuration:
- nrf52832 microcontroller
- Softdevice S132 V4.0.2
- Nordic SDK 13.0
I'm using an "app_timer" in repeated mode with 10Hz frequency.
#define M_10HZ_TIMER_VALUE APP_TIMER_TICKS(100) /* 10Hz = 100ms */
APP_TIMER_DEF(m_10Hz_timer_id);
app_timer_create(&m_10Hz_timer_id, APP_TIMER_MODE_REPEATED, m_10Hz_timer_handler);
app_timer_start(m_10Hz_timer_id, M_10HZ_TIMER_VALUE, NULL);
The timer handler (m_10Hz_timer_handler) is a function that execute a complex mathematical algorithm (no use of peripherals).
This handler function is time critical and it's necessary that its interval execution is precise and guaranteed.
In order to obtain this, I set app_timer priority high as possible:
// <i> Priorities 0,2 (nRF51) and 0,1,4,5 (nRF52) are reserved for SoftDevice
// <0=> 0 (highest)
// <1=> 1
// <2=> 2
// <3=> 3
// <4=> 4
// <5=> 5
// <6=> 6
// <7=> 7
#ifndef APP_TIMER_CONFIG_IRQ_PRIORITY
#define APP_TIMER_CONFIG_IRQ_PRIORITY 2
#endif
I tried with priority 2 and 3.
Problem: BLE connection is not stable, if I set priority 2 or 3.
How can I solve this? Is there any way to set timer with high priority and guaranteed the stability of BLE connection?
Thank
