[GitHub] amrbekhit opened a new pull request #1670: Implement low-power support in the LoRa stack and modify the nRF timer code to use the HFXO manager.

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amrbekhit opened a new pull request #1670: Implement low-power support in the LoRa stack and modify the nRF timer code to use the HFXO manager.
URL: https://github.com/apache/mynewt-core/pull/1670
 
 
   Use of timers in the LoRa stack has been split into critical and non-critial timers. Non-critical timers (such as retry delays) are now implemented using the os_cputime functions. The
   os_cputime needs to be configured to use a lower power time in the BSP (such as is done by the BLE stack via the BLE_LP_CLOCK syscfg). Critical timers are only used to time the opening of
   the RX windows. These continue to use the hal_timer functions, but require that the user implements two callback functions (lora_low_power_enter and lora_low_power_exit) to turn the
   LORA_MAC_TIMER off and on. This is necessary as turning a timer on is a hardware-specific operation that may require that the caller pass in a custom configuration struct.
   
   This patch also modifies the nRF timer code to use the HFXO manager found in hw/mcu/nordic/nrf52xxx/src/nrf5x_clock.c. This allows multiple different timers to be turned on and off
   independently and manager will automatically turn the nRF HFXO on and off as required. This is necessary in order for the LoRa and BLE stacks to be able to run side by side.

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