Dear All,
My board has an STM32l072RZ mcu. I am trying to study low power modes. I created a sleep mode example and I flashed it properly. Everything looks great until this point. But, when i tried to connect after first flashing, my jtag(jlink) says that "Connecting to target...ERROR: STM32: Connecting to CPU via connect under reset failed." The two of my boards bricked now.
My simple code(based on CubeMX)
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* MCU Configuration----------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
SystemPower_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_USART2_UART_Init();
//MX_USB_DEVICE_Init();
/* USER CODE BEGIN 2 */
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
HAL_GPIO_WritePin(BATT_CE_GPIO_Port, BATT_CE_Pin, GPIO_PIN_RESET);
HAL_GPIO_WritePin(LED_POWER_RED_GPIO_Port, LED_POWER_RED_Pin, GPIO_PIN_SET);
HAL_GPIO_WritePin(BT_POWER_GPIO_Port, BT_POWER_Pin, GPIO_PIN_SET);
while (1)
{
/* USER CODE END WHILE */
if(HAL_GPIO_ReadPin(LEFT_BUTTON_GPIO_Port, LEFT_BUTTON_Pin) == 0)
{
/* Enable the power down mode during Sleep mode */
__HAL_FLASH_SLEEP_POWERDOWN_ENABLE();
/* Suspend Tick increment to prevent wakeup by Systick interrupt. */
/* Otherwise the Systick interrupt will wake up the device within 1ms */
/* (HAL time base). */
HAL_SuspendTick();
/* Enter Sleep Mode , wake up is done once User push-button is pressed */
HAL_PWR_EnterSLEEPMode(PWR_LOWPOWERREGULATOR_ON, PWR_SLEEPENTRY_WFI);
}
/* Resume Tick interrupt if disabled prior to sleep mode entry */
HAL_ResumeTick();
if(HAL_GetTick() % 1000 == 0)
{
HAL_GPIO_TogglePin(LED_POWER_RED_GPIO_Port, LED_POWER_RED_Pin);
}
pin_status = HAL_GPIO_ReadPin(BATT_PGOOD_GPIO_Port, BATT_PGOOD_Pin);
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
static void SystemPower_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
/* Enable Power Control clock */
__HAL_RCC_PWR_CLK_ENABLE();
/* Enable Ultra low power mode */
HAL_PWREx_EnableUltraLowPower();
/* Enable the fast wake up from Ultra low power mode */
HAL_PWREx_EnableFastWakeUp();
/* Enable GPIOs clock */
__HAL_RCC_GPIOA_CLK_ENABLE();
__HAL_RCC_GPIOB_CLK_ENABLE();
__HAL_RCC_GPIOC_CLK_ENABLE();
__HAL_RCC_GPIOD_CLK_ENABLE();
__HAL_RCC_GPIOH_CLK_ENABLE();
__HAL_RCC_GPIOE_CLK_ENABLE();
/* Configure all GPIO port pins in Analog Input mode (floating input trigger OFF) */
/* Note: Debug using ST-Link is not possible during the execution of this */
/* example because communication between ST-link and the device */
/* under test is done through UART. All GPIO pins are disabled (set */
/* to analog input mode) including UART I/O pins. */
GPIO_InitStructure.Pin = GPIO_PIN_All;
GPIO_InitStructure.Mode = GPIO_MODE_ANALOG;
GPIO_InitStructure.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOA, &GPIO_InitStructure);
HAL_GPIO_Init(GPIOB, &GPIO_InitStructure);
HAL_GPIO_Init(GPIOC, &GPIO_InitStructure);
HAL_GPIO_Init(GPIOD, &GPIO_InitStructure);
HAL_GPIO_Init(GPIOH, &GPIO_InitStructure);
HAL_GPIO_Init(GPIOE, &GPIO_InitStructure);
/* Disable GPIOs clock */
__HAL_RCC_GPIOA_CLK_DISABLE();
__HAL_RCC_GPIOB_CLK_DISABLE();
__HAL_RCC_GPIOC_CLK_DISABLE();
__HAL_RCC_GPIOD_CLK_DISABLE();
__HAL_RCC_GPIOH_CLK_DISABLE();
__HAL_RCC_GPIOE_CLK_DISABLE();
}
