diff options
| author | Benny Meisels <benny.meisels@gmail.com> | 2019-08-18 09:11:16 +0300 |
|---|---|---|
| committer | Benny Meisels <benny.meisels@gmail.com> | 2019-08-20 23:30:21 +0300 |
| commit | fe2ec6c887a5c4d8414fa19879dd5a1b083d0240 (patch) | |
| tree | eb4cf2909339d020d6a511af464cf77196779fa3 /ports/nrf/peripherals | |
| parent | 3f7321af0074456f11c7614d8c29d91b787411f6 (diff) | |
Add support for nrf boards that don't have an external crystal
Diffstat (limited to 'ports/nrf/peripherals')
| -rw-r--r-- | ports/nrf/peripherals/nrf/clocks.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/ports/nrf/peripherals/nrf/clocks.c b/ports/nrf/peripherals/nrf/clocks.c index 4acb878db..de9eec6b5 100644 --- a/ports/nrf/peripherals/nrf/clocks.c +++ b/ports/nrf/peripherals/nrf/clocks.c @@ -26,11 +26,21 @@ */ #include "nrfx.h" +#include "mpconfigboard.h" // for BOARD_HAS_CRYSTAL + +static inline bool board_has_crystal(void) { +#ifdef BOARD_HAS_CRYSTAL + return BOARD_HAS_CRYSTAL == 1; +#else + return false; +#endif +} void nrf_peripherals_clocks_init(void) { - // Set low-frequency clock source to be crystal. If there's a crystalless board, this will need to be - // generalized. - NRF_CLOCK->LFCLKSRC = (uint32_t)((CLOCK_LFCLKSRC_SRC_Xtal << CLOCK_LFCLKSRC_SRC_Pos) & CLOCK_LFCLKSRC_SRC_Msk); + // Set low-frequency clock source to be either an external 32.768kHz crystal if one exists on the board + // or an internal 32.768 kHz RC oscillator otherwise + uint32_t clock_src = board_has_crystal() ? CLOCK_LFCLKSRC_SRC_Xtal : CLOCK_LFCLKSRC_SRC_RC; + NRF_CLOCK->LFCLKSRC = (uint32_t)((clock_src << CLOCK_LFCLKSRC_SRC_Pos) & CLOCK_LFCLKSRC_SRC_Msk); NRF_CLOCK->TASKS_LFCLKSTART = 1UL; // Wait for clocks to start. |