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Use NRF_LF_SRC_SYNTH as 32k clock source #509

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Use NRF_LF_SRC_SYNTH as 32k clock source #509

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32b77fb
Use NRF_LF_SRC_SYNTH as 32k clock source
facchinm Jun 22, 2022
fa5a1e1
nano33ble: disable UART0 only if enabled by bootloader
facchinm Jun 23, 2022
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1 change: 1 addition & 0 deletions variants/ARDUINO_NANO33BLE/conf/mbed_app.json
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@
],
"target_overrides": {
"*": {
"target.lf_clock_src":"NRF_LF_SRC_SYNTH",
"target.printf_lib": "std",
"platform.stdio-buffered-serial": false,
"platform.stdio-baud-rate": 115200,
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16 changes: 12 additions & 4 deletions variants/ARDUINO_NANO33BLE/variant.cpp
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Expand Up @@ -135,12 +135,18 @@ extern "C" {
#include "nrf_rtc.h"
#include "nrf_uarte.h"
#include "nrf_uart.h"
#include "nrf_clock.h"

void initVariant() {
// turn power LED on
pinMode(LED_PWR, OUTPUT);
digitalWrite(LED_PWR, HIGH);

if (nrf_clock_int_enable_check(NRF_CLOCK_INT_LF_STARTED_MASK)) {
// NINA B306 01B modules (without 32k xtal)
nrf_clock_int_disable(NRF_CLOCK_INT_LF_STARTED_MASK);
}

// Errata Nano33BLE - I2C pullup is controlled by the SWO pin.
// Configure the TRACEMUX to disable routing SWO signal to pin.
NRF_CLOCK->TRACECONFIG = 0;
Expand All @@ -159,10 +165,12 @@ void initVariant() {
digitalWrite(PIN_ENABLE_I2C_PULLUP, HIGH);

// Disable UARTE0 which is initially enabled by the bootloader
nrf_uarte_task_trigger(NRF_UARTE0, NRF_UARTE_TASK_STOPRX);
while (!nrf_uarte_event_check(NRF_UARTE0, NRF_UARTE_EVENT_RXTO)) ;
NRF_UARTE0->ENABLE = 0;
NRF_UART0->ENABLE = 0;
if (nrf_uarte_event_check(NRF_UARTE0, NRF_UARTE_EVENT_RXTO)) {
nrf_uarte_task_trigger(NRF_UARTE0, NRF_UARTE_TASK_STOPRX);
while (!nrf_uarte_event_check(NRF_UARTE0, NRF_UARTE_EVENT_RXTO));
NRF_UARTE0->ENABLE = 0;
NRF_UART0->ENABLE = 0;
}

NRF_PWM_Type* PWM[] = {
NRF_PWM0, NRF_PWM1, NRF_PWM2
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