mdbt42v-512kv2

RE: mdbt42v-512kv2

Simonr — Mon, 30 Jun 2025 13:48:17 GMT

-DNRF_SDH_CLOCK_LF_SRC=1-DNRF_SDH_CLOCK_LF_SRC=1 points to you using the external clock as a clock source. To use the internal RC oscillator, this option must be set to 0, and you need to set NRF_SDH_CLOCK_LF_RC_CTIV =16, NRF_SDH_CLOCK_LF_RC_TEMP_CTIV=2, NRF_SDH_CLOCK_LF_ACCURACY=1 to enable calibration as well.

Best regards,

Simon

RE: mdbt42v-512kv2

cavus — Fri, 27 Jun 2025 18:29:30 GMT

I'm trying to control it via Arduino. To make it use the internal oscillator, I added the following line to the boards.txt file:
feather52832.build.extra_flags=-DARDUINO_FEATHER52 -DNRF_SDH_CLOCK_LF_SRC=1
However, it didn't respond. Here's the code I used:

#include <bluefruit.h>

#define LED_PIN 4  // P0.04

void setup() {
  pinMode(LED_PIN, OUTPUT);

  Bluefruit.begin();
  Bluefruit.setTxPower(4);    // (Optional) Set transmission power
  Bluefruit.setName("MDBT42Q"); // Bluetooth cihaz ismi
  Bluefruit.Advertising.addFlags(BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE);
  Bluefruit.Advertising.addTxPower();
  Bluefruit.Advertising.addName();
  Bluefruit.Advertising.start(0);  // 0 = advertise forever

  delay(1000);  // Stabil başlatma için kısa bekleme
}

void loop() {
  digitalWrite(LED_PIN, HIGH);
  delay(2000);  // 2 saniye açık
  digitalWrite(LED_PIN, LOW);
  delay(2000);  // 2 saniye kapalı
}

RE: mdbt42v-512kv2

Turbo J — Fri, 27 Jun 2025 17:29:42 GMT

The BTLE examples require the 32.768kHz crystal by default. You need to change the configuration in order to use the LFRC. Very often discussed here, should also be mentioned in the docs.