README
WWDG example
1 Brief
The function of this program is to let the LED light for 300 milliseconds and then turn off, then turn on WWDG and enter the dead loop waiting for the interruption of wwdg.In the WWDG interrupt service function, the dog is fed and the serial port outputs a wwdg success message.
2 Hardware Hookup
The hardware resources used in this experiment are:
- LED - PA8
- USART1 - PA9\PA10
- WWDG
The WWDG used in this experiment is the on-chip resource of STM32H503, so there is no corresponding connection schematic diagram.
3 STM32CubeIDE Configuration
Let's copy the project from 04_UART and name both the project and the.ioc file 06_WWDG. Next we start the WWDG configuration by double-clicking the 06_WWDG.ioc file.
First, click System Core > WWDG, and the configuration is as follows:
The configuration of the NVIC is shown below:
Click File > Save, and you will be asked to generate code.Click Yes.
code
wwdg.c
We added an interrupt callback function to the initialization code, as follows:
void HAL_WWDG_EarlyWakeupCallback(WWDG_HandleTypeDef *hwwdg)
{
HAL_WWDG_Refresh(hwwdg); /* Update the window watchdog value. */
printf("wwdg success\r\n"); /* Feeding the dog successfully. */
}
From the above code, in the interrupt service function, we perform a dog feed operation on WWDG and print a message from the serial port indicating that the dog was fed successfully.
main.c
The main.c code of this experiment lets the LCD light up for 300 milliseconds, and turns off the LED in the while loop as follows:
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();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_ICACHE_Init();
MX_USART1_UART_Init();
MX_WWDG_Init();
/* USER CODE BEGIN 2 */
LED(0); /* turn on LED */
HAL_Delay(300); /* delay 300ms */
stm32h503cb_show_mesg();
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
LED(1); /* turn off LED */
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
4 Running
4.1 Compile & Download
After the compilation is complete, connect the DAP and the Mini Board, and then connect to the computer together to download the program to the Mini Board.
4.2 Phenomenon
Press the reset button to restart the Mini Board, open the serial debugging assistant will print the experiment information, indicating that the program has been downloaded successfully.Observe that the LED on the Mini Board will light up and turn off once, and the serial port host computer ATK-XCOM can see the continuous print wwdg succes, indicating that the WWDG feeding dog has been normally executed.
