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Merge pull request #2072 from bmeisels/nrf-no-crystal-support 

Add support for nrf boards that don't have an external crystal
This commit is contained in:
Scott Shawcroft 2019-08-21 13:01:26 -07:00 committed by GitHub
parent 42143ca056 fe2ec6c887
commit 389e7cc35d
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 37 additions and 7 deletions
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28
ports/nrf/common-hal/bleio/Adapter.c
View File

@ -39,17 +39,37 @@
#include "supervisor/usb.h"
#include "shared-bindings/bleio/Adapter.h"
#include "shared-bindings/bleio/Address.h"
#include "mpconfigboard.h" // for BOARD_HAS_CRYSTAL
STATIC void softdevice_assert_handler(uint32_t id, uint32_t pc, uint32_t info) {
mp_raise_msg_varg(&mp_type_AssertionError,
translate("Soft device assert, id: 0x%08lX, pc: 0x%08lX"), id, pc);
}
static inline bool board_has_crystal(void) {
#ifdef BOARD_HAS_CRYSTAL
return BOARD_HAS_CRYSTAL == 1;
#else
return false;
#endif
}
STATIC uint32_t ble_stack_enable(void) {
nrf_clock_lf_cfg_t clock_config = {
.source = NRF_CLOCK_LF_SRC_XTAL,
.accuracy = NRF_CLOCK_LF_ACCURACY_20_PPM
};
nrf_clock_lf_cfg_t clock_config;
// 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
if (board_has_crystal()) {
clock_config = (nrf_clock_lf_cfg_t){
.source = NRF_CLOCK_LF_SRC_XTAL,
.accuracy = NRF_CLOCK_LF_ACCURACY_20_PPM};
} else {
clock_config = (nrf_clock_lf_cfg_t){
.source = NRF_CLOCK_LF_SRC_RC,
.rc_ctiv = 16,
.rc_temp_ctiv = 2,
.accuracy = NRF_CLOCK_LF_ACCURACY_250_PPM};
}
uint32_t err_code = sd_softdevice_enable(&clock_config, softdevice_assert_handler);
if (err_code != NRF_SUCCESS)

16
ports/nrf/peripherals/nrf/clocks.c
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@ -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.