Unable to program or connect using Cube Programmer after this code

[PSaga.1]

Hello,

I was trying to understand the leakage in my STM32L073 based board. After programming with this code for 3 different boards I am now unable to connect to board both using the programmer and IDE. I have tried BOOT0 and nRST combo to connect but have failed. What could be the reason and how do deal with this?

#include "stm32l0xx_hal.h"

void main() {
    // Configure PC10 and PA12 as pull-downs
    GPIO_InitTypeDef GPIO_InitStruct = {0};

    __HAL_RCC_GPIOC_CLK_ENABLE();
    __HAL_RCC_GPIOA_CLK_ENABLE();

    // Configure PC10 as input with pull-down
    GPIO_InitStruct.Pin = GPIO_PIN_10;
    GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
    GPIO_InitStruct.Pull = GPIO_PULLDOWN;
    HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

    // Configure PA12 as input with pull-down
    GPIO_InitStruct.Pin = GPIO_PIN_12;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

    // Disable SysTick interrupt
    HAL_SuspendTick();

    // Clear wake-up flag
    PWR->CR |= PWR_CR_CWUF;

    // Enter Stop Mode
    HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);

    // After wake-up: reinitialize peripherals and resume SysTick
    HAL_ResumeTick();
}

 Thanks and regards 

[STea]

Hello @PSaga.1 ,

It seems like you are entering stop mode and not configuring the correct event to get you out of it try to connect in CubePrgrammer with under reset option and then perform a full chip erase.

Regards

[NEdom.1]

If there is a RESET key, try press and hold the RESET key while start programming.

Wait until you see the connection prompt, release the RESET key and let the programmer to connect to the MCU.

By setting BOOT0 to level HIGH, the MCU boot from internal bootloader other than your app in flash memory. If BOOT0 is set to HIGH and you can't connect to MCU, then check the clock signals.