module1-1(hal).c

#include "stm32f4xx_hal.h"

void SystemClock_Config(void);
void Error_Handler(void);
void MX_GPIO_Init(void);

volatile uint32_t msTicks = 0;   /* Counts 1ms timeTicks */

void SysTick_Handler(void) {
  HAL_IncTick();   /* Increment HAL tick count */
  msTicks++;       /* Increment the msTicks variable */
}

int main(void) {
  HAL_Init();            /* Initialize the HAL Library */
  SystemClock_Config();  /* Configure the system clock */
  MX_GPIO_Init();       /* Initialize the GPIO */

  /* Configure the SysTick to generate an interrupt every millisecond */
   HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq() / 1000);

  while (1) {
    HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, GPIO_PIN_SET);  /* Turn the LED on */
    HAL_Delay(500);                                          /* Delay for 500 ms */
    HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, GPIO_PIN_RESET); /* Turn the LED off */
    HAL_Delay(500);                                          /* Delay for 500 ms */
  }
}

/* Configure the system clock to 84 MHz */
void SystemClock_Config(void) {
   RCC_OscInitTypeDef RCC_OscInitStruct = {0};
   RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

   /* Configure the main internal regulator output voltage */
   __HAL_RCC_PWR_CLK_ENABLE();
   __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE2);

   /* Initializes the RCC Oscillators according to the specified parameters */
   RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
   RCC_OscInitStruct.HSIState = RCC_HSI_ON;
   RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
   RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
   RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
   RCC_OscInitStruct.PLL.PLLM = 16;
   RCC_OscInitStruct.PLL.PLLN = 336;
   RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV4;
   RCC_OscInitStruct.PLL.PLLQ = 7;
   if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
     Error_Handler();
   }

   /* Initializes the CPU, AHB and APB busses clocks */
   RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_SYSCLK |
                                 RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2;
   RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
   RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
   RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
   RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

   if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK) {
     Error_Handler();
   }
}

 void Error_Handler(void) {
   while (1) {
     /* Stay in loop if there's an error */
   }
 }

void MX_GPIO_Init(void) {
  __HAL_RCC_GPIOA_CLK_ENABLE();  /* Enable the GPIOA clock */

  GPIO_InitTypeDef GPIO_InitStruct = {0};

  /* Configure GPIO pin : PA5 (LED Pin on Nucleo board) */
  GPIO_InitStruct.Pin = GPIO_PIN_5;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
}