Custom PCB with mdbt50q-1mv2, with internal 32KHz Oscillator doesn't start.

[megannnn98]

Hi all.

hello everyone. I have a project on the nrf52840 board. The wiring of the board is shown below. The module is correctly flashed, but does not start. As if it is constantly in a Reset state. There is no external 32 kHz oscillator, I use an internal one. Below I will give the prog.conf settings. Please tell me where to dig.

This article didn't help (((

devzone.nordicsemi.com/.../custom-pcb-with-mdbt50q-with-internal-oscillator

CONFIG_NEWLIB_LIBC=y

CONFIG_NEWLIB_LIBC_NANO=n

CONFIG_STD_CPP2B=y

CONFIG_PM_DEVICE=y

CONFIG_POWEROFF=y

CONFIG_CPLUSPLUS=y

CONFIG_LIB_CPLUSPLUS=y

CONFIG_POSIX_MAX_FDS=16

CONFIG_POSIX_API=y

CONFIG_PTHREAD_IPC=y

CONFIG_MAX_PTHREAD_COUNT=5

CONFIG_SEM_VALUE_MAX=32767

# CONFIG_POSIX_CLOCK=y

CONFIG_MAX_TIMER_COUNT=5

CONFIG_POSIX_MQUEUE=y

CONFIG_MSG_COUNT_MAX=16

CONFIG_MSG_SIZE_MAX=16

CONFIG_MQUEUE_NAMELEN_MAX=16

CONFIG_EVENTFD=n

CONFIG_MAIN_STACK_SIZE=4096

CONFIG_KERNEL_INIT_PRIORITY_OBJECTS=30

CONFIG_KERNEL_INIT_PRIORITY_DEFAULT=40

CONFIG_KERNEL_INIT_PRIORITY_DEVICE=50

CONFIG_APPLICATION_INIT_PRIORITY=90

CONFIG_FPU=y

CONFIG_FPU_SHARING=y

CONFIG_ADC=y

#Enable MCUBOOT bootloader build in the application

CONFIG_BOOTLOADER_MCUBOOT=y

#Include MCUMGR and the dependencies in the build

CONFIG_NCS_SAMPLE_MCUMGR_BT_OTA_DFU=y

CONFIG_DISABLE_FLASH_PATCH=y

CONFIG_NRFX_SPIM3=y

CONFIG_BOOT_BANNER=n

CONFIG_GPIO=y

CONFIG_NRFX_TIMER1=y

CONFIG_NRFX_TIMER2=y

CONFIG_NRFX_TIMER3=y

CONFIG_ASSERT=y

CONFIG_NRFX_PWM1=y

CONFIG_SERIAL=y

CONFIG_CONSOLE=y

CONFIG_UART_CONSOLE=y

CONFIG_RTT_CONSOLE=y

# Config logger

CONFIG_LOG=y

CONFIG_LOG_MODE_IMMEDIATE=y

CONFIG_LOG_DEFAULT_LEVEL=3

CONFIG_LOG_BACKEND_SHOW_COLOR=y

CONFIG_LOG_INFO_COLOR_GREEN=y

CONFIG_LOG_BACKEND_UART=y

CONFIG_LOG_BACKEND_UART_OUTPUT_TEXT=y

CONFIG_USE_SEGGER_RTT=y

CONFIG_LOG_BACKEND_RTT=y

CONFIG_LOG_RUNTIME_FILTERING=y

CONFIG_LOG_BUFFER_SIZE=2048

CONFIG_LOG_PRINTK=y

CONFIG_LOG_PROCESS_TRIGGER_THRESHOLD=0

CONFIG_COVERAGE=n

CONFIG_LOG_TAG_MAX_LEN=8

CONFIG_SPI=y

CONFIG_WS2812_STRIP_SPI=y

CONFIG_LED_STRIP=y

CONFIG_LED_STRIP_LOG_LEVEL_DBG=y

CONFIG_WS2812_STRIP=y

# flash

CONFIG_FLASH=y

CONFIG_FLASH_PAGE_LAYOUT=y

CONFIG_FLASH_MAP=y

CONFIG_NVS=y

CONFIG_MPU_ALLOW_FLASH_WRITE=y

# CONFIG_USE_DT_CODE_PARTITION=y # offset

CONFIG_PM_PARTITION_SIZE_NVS_STORAGE=0x2000

CONFIG_TEST_RANDOM_GENERATOR=y

CONFIG_TIMER_RANDOM_GENERATOR=y

CONFIG_PINCTRL=y

CONFIG_PINCTRL_NRF=y

CONFIG_CLOCK_CONTROL_NRF_K32SRC_XTAL=n

CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y

CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC_CALIBRATION=y

CONFIG_CLOCK_CONTROL_NRF_K32SRC_SYNTH=n

[megannnn98]

Upd. I've read clock registers. They look like this

 0x40000304 00000002 INTENSET - LFCLKSTARTED(Enabled)
 0x40000308 00000002 INTENCLR - LFCLKSTARTED(Enabled)
 0x4000040C 00010000 HFCLKSTAT - 64 MHz internal oscillator (HFINT), HFCLK running
 0x40000414 00000001 LFCLKRUN - Task triggered, 32.768 kHz RC oscillator
 0x40000418 00010000 LFCLKSTAT - LFCLK running
 0x4000041C 00000001 LFCLKSRCCOPY - 32.768 kHz crystal oscillator
 0x40000518 00000001 LFCLKSRC - 32.768 kHz crystal oscillator

Could you please help me to force the board to work without LFCLK?

[Kazi Afroza Sultana]

Hello,

Do you have DCDC configuration on your board?

[megannnn98]

Hello,

Thaks for your interest!
No, I don't. This is the schematic.

The registers DCDCEN and DCDCEN0 have zero values. I've read them with JLinkExe.

[megannnn98]

UPD:

I had to add to the mcuboot and the application. It helped.

CONFIG_CLOCK_CONTROL_NRF_K32SRC_XTAL=n

CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y

CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC_CALIBRATION=y

CONFIG_CLOCK_CONTROL_NRF_K32SRC_SYNTH=n

[Kazi Afroza Sultana]

Hello,

You do not have external RC, so you set this n. That's perfect. Same goes for CONFIG_CLOCK_CONTROL_NRF_K32SRC_SYNTH=n. 

Did you solve the issue?