/*
 * 本檔案包括四種延時方式：
 * 1. 原來的HAL庫函式HAL_Delay（）    2. 採用定時器2設定延時函式     3. 採用系統滴答中斷方式的ms和us級延時
 * 4. 採用系統滴答非中斷方式的ms和us級延時（在一次計數值範圍內的延時）
 */


/* Includes ------------------------------------------------------------------*/
#include "stm32l1xx_hal.h"
#include "tim.h"
#include "usart.h"
#include "gpio.h"

/* USER CODE BEGIN Includes */

/* USER CODE END Includes */

/* Private variables ---------------------------------------------------------*/

/* USER CODE BEGIN PV */
/* Private variables ---------------------------------------------------------*/

volatile unsigned int timenum;      //必須要加volatile！！！
volatile unsigned long time_delay; // 延時時間，注意定義為全域性變數

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
void Error_Handler(void);

/* USER CODE BEGIN PFP */
/* Private function prototypes -----------------------------------------------*/
HAL_StatusTypeDef delay_10us(uint32_t num);
void delay_us(volatile unsigned long nms);
void delay_ms(volatile unsigned long nms);
void delay_ms2(int32_t nms);

/* USER CODE END PFP */

/* USER CODE BEGIN 0 */

int fputc(int ch, FILE *f)  
{  
	HAL_UART_Transmit(&huart2 , (uint8_t *)&ch, 1, 0xFFFF);  
	return ch;  
}

/* USER CODE END 0 */

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();

  /* Configure the system clock */
  SystemClock_Config();

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_TIM2_Init();
  MX_USART2_UART_Init();

  /* USER CODE BEGIN 2 */

     
  /*##-1- Start the TIM Base generation in interrupt mode ####################*/
  //HAL_TIM_Base_Start_IT(&htim2);
     
		 
	printf("Testing timer2\n");
	HAL_Delay(1000);
	printf("Testing timer2\n");
		HAL_Delay(1000);
	printf("Testing timer2\n");
		HAL_Delay(1000);
	printf("Testing timer2\n");
		HAL_Delay(1000);
	printf("Testing timer2\n");


  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
  /* USER CODE END WHILE */

  /* USER CODE BEGIN 3 */
		//HAL_GPIO_WritePin(GPIOB, GPIO_PIN_8, GPIO_PIN_RESET);
		delay_ms2(500);
		printf("12\n");
		//HAL_GPIO_WritePin(GPIOB, GPIO_PIN_8, GPIO_PIN_SET);

		//delay_us(500000);

  }
  /* USER CODE END 3 */

}

/** System Clock Configuration
*/
void SystemClock_Config(void)
{

  RCC_OscInitTypeDef RCC_OscInitStruct;
  RCC_ClkInitTypeDef RCC_ClkInitStruct;

  __HAL_RCC_PWR_CLK_ENABLE();

  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);

  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL12;
  RCC_OscInitStruct.PLL.PLLDIV = RCC_PLL_DIV3;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }

  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_DIV1;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)
  {
    Error_Handler();
  }

  HAL_RCC_MCOConfig(RCC_MCO1, RCC_MCO1SOURCE_SYSCLK, RCC_MCODIV_1);

  HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/1000);  //注意這裡HAL庫重灌了系統計數器的值，使美1ms中斷一次！！

  HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);

  /* SysTick_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0);
}

/* USER CODE BEGIN 4 */

/**
  * @brief  Period elapsed callback in non blocking mode
  * @param  htim: TIM handle
  * @retval None
  */
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)//定時器2中斷處理函式
{
    if (htim->Instance == htim2.Instance)
    {
			HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_8);
			if(timenum)
			{
				timenum--;
				//printf("%d\n", timenum);
			}
    }
}

HAL_StatusTypeDef delay_10us(uint32_t num)//自定義的定時器2實現延時的函式
{
	timenum = num;
	HAL_TIM_Base_Start_IT(&htim2);
	while(timenum)											//為什麼一直停在這個迴圈中？？？3-2-1-2-3……怎麼會這樣！！！--volatile！
		;
	HAL_TIM_Base_Stop_IT(&htim2);
	
	return HAL_OK;
	
}



//SysTick實現延時n_ms，中斷方式
void delay_ms(volatile unsigned long nms)
{
    //SYSTICK分頻--1ms的系統時鐘中斷
    if (SysTick_Config(HAL_RCC_GetHCLKFreq()/1000))
    {
   
        while (1);
    }
    time_delay=nms;//讀取定時時間
    while(time_delay);
    SysTick->CTRL=0x00; //關閉計數器
    SysTick->VAL =0X00; //清空計數器
}


//SysTick實現延時n_us，中斷方式
void delay_us(volatile unsigned long nus)
{
 //SYSTICK分頻--1us的系統時鐘中斷
    if (SysTick_Config(HAL_RCC_GetHCLKFreq()/1000000))
    {
   
        while (1);
    }
    time_delay=nus;//讀取定時時間
    while(time_delay);
    SysTick->CTRL=0x00; //關閉計數器
    SysTick->VAL =0X00; //清空計數器
}

//SysTick實現延時中斷方式的中斷處理函式
//在中斷中將time_delay遞減。實現延時
//void SysTick_Handler(void)
//{
//    if(time_delay)
//        time_delay--;
//}


//void HAL_SYSTICK_Callback(void)//原cube HAL庫中中斷處理回撥函式重寫
//{
//	if(time_delay)
//		time_delay--;	
//}


//void HAL_IncTick(void)//原cube HAL庫中，重寫
//{
//	if(time_delay)
//		time_delay--;	
//}

/********************************* 優選的方式 ***********************************************************************/
/*一次填充系統計時器以實現非中斷延遲，受限系統計時器stmtick只有24位，所以最長計時有所限制*/
void delay_ms2(int32_t nms)
{
 int32_t temp;
 SysTick->LOAD = 8000*nms;
 SysTick->VAL=0X00;//清空計數器
 SysTick->CTRL=0X01;//使能，減到零是無動作，採用外部時鐘源
 do
 {
  temp=SysTick->CTRL;//讀取當前倒計數值
 }while((temp&0x01)&&(!(temp&(1<<16))));//等待時間到達
    SysTick->CTRL=0x00; //關閉計數器
    SysTick->VAL =0X00; //清空計數器
}

/* USER CODE END 4 */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/


/*********************************************************************************************************************/
/*********************************************************************************************************************/
/*********************************************************************************************************************/

/*如果自寫系統時鐘中斷處理函式，需要在stml1xx_it.c中註釋掉一下函式*/

/**
* @brief This function handles System tick timer.
*/
#if 1
void SysTick_Handler(void)
{
  /* USER CODE BEGIN SysTick_IRQn 0 */

  /* USER CODE END SysTick_IRQn 0 */
  HAL_IncTick();
  HAL_SYSTICK_IRQHandler();
  /* USER CODE BEGIN SysTick_IRQn 1 */

  /* USER CODE END SysTick_IRQn 1 */
}
#endif