// STM32 Blue Pill HAL Blink + printf() example

#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <stm32f1xx_hal.h>

// Set STM32F103 LED RED (PC13)
#define LED_PORT                GPIOC
#define LED_PIN                 GPIO_PIN_13
#define LED_PORT_CLK_ENABLE     __HAL_RCC_GPIOC_CLK_ENABLE




UART_HandleTypeDef huart2;

void Error_Handler(void);
void SystemClock_Config(void);
static void MX_USART2_UART_Init(void);

//! The interrupt handler for the SysTick module
void SysTick_Handler(void)
{

}


int main(void)
{
  const char * hello_world = "Hello STM32\r\n";

  HAL_Init();
  SystemClock_Config();

  initGPIO();
  MX_USART2_UART_Init();



  // HAL_UART_Transmit(&huart2, (uint8_t *)hello_world, strlen(hello_world), HAL_MAX_DELAY);

 
  while (1)
  {
    int i=2;
      printf("sddd");
  // HAL_UART_Transmit(&huart2, (int *)i, strlen(i), HAL_MAX_DELAY);

     for(i=0; i<1000;i++)
      {
        HAL_GPIO_WritePin(GPIOB, GPIO_PIN_6, GPIO_PIN_SET);
HAL_Delay(2);

        HAL_GPIO_WritePin(GPIOB, GPIO_PIN_6, GPIO_PIN_RESET);
HAL_Delay(18);

      }

      
  }

  return 0;
}

/**
    @brief System Clock Configuration
    @retval None
*/
void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

  /* Initializes the CPU, AHB and APB busses clocks */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;

  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_HSI;
  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_0) != HAL_OK)
  {
    Error_Handler();
  }
}

void initGPIO()
{
  GPIO_InitTypeDef GPIO_Config;

  GPIO_Config.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_Config.Pull = GPIO_NOPULL;
  GPIO_Config.Speed = GPIO_SPEED_FREQ_HIGH;

  GPIO_Config.Pin = LED_PIN;

  LED_PORT_CLK_ENABLE();
  HAL_GPIO_Init(LED_PORT, &GPIO_Config);

//  __HAL_RCC_GPIOA_CLK_ENABLE();
}

/**
    @brief USART2 Initialization Function
    @param None
    @retval None
*/
static void MX_USART2_UART_Init(void)
{
  __HAL_RCC_GPIOA_CLK_ENABLE();
  /**
    USART2 GPIO Configuration
    PA2     ------> USART2_TX
    PA15    ------> USART2_RX
  */
  GPIO_InitTypeDef GPIO_InitStruct = {0};
  GPIO_InitStruct.Pin = GPIO_PIN_2 | GPIO_PIN_15;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
//  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
//  GPIO_InitStruct.Alternate = GPIO_AF4_USART2;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  huart2.Instance = USART2;
  huart2.Init.BaudRate = 115200;
  huart2.Init.WordLength = UART_WORDLENGTH_8B;
  huart2.Init.StopBits = UART_STOPBITS_1;
  huart2.Init.Parity = UART_PARITY_NONE;
  huart2.Init.Mode = UART_MODE_TX_RX;
  huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart2.Init.OverSampling = UART_OVERSAMPLING_16;
//  huart2.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
//  huart2.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
  if (HAL_UART_Init(&huart2) != HAL_OK)
  {
    Error_Handler();
  }

  __HAL_RCC_USART2_CLK_ENABLE();
}

#define STDOUT_FILENO   1
#define STDERR_FILENO   2

int _write(int file, char *ptr, int len)
{
  switch (file)
  {
    case STDOUT_FILENO: /*stdout*/
      HAL_UART_Transmit(&huart2, ptr, len, HAL_MAX_DELAY);
      // Send the string somewhere
      break;
    case STDERR_FILENO: /* stderr */
      HAL_UART_Transmit(&huart2, ptr, len, HAL_MAX_DELAY);
      // Send the string somewhere
      break;
    default:
      return -1;
  }
  return len;
}

void Error_Handler(void)
{
  /* User can add his own implementation to report the HAL error return state */
}

#ifdef USE_FULL_ASSERT
/**
    @brief  Reports the name of the source file and the source line number
            where the assert_param error has occurred.
    @param  file: pointer to the source file name
    @param  line: assert_param error line source number
    @retval None
*/
void assert_failed(uint8_t *file, uint32_t line)
{
  /* User can add his own implementation to report the file name and line number,
    tex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
}
#endif /* USE_FULL_ASSERT */