main.c

#include "main.h"
#include <stdio.h>
#include <string.h>

// Define Pins
#define S0 GPIO_PIN_4        // PB4
#define S1 GPIO_PIN_5        // PB5
#define S2 GPIO_PIN_6        // PB6
#define S3 GPIO_PIN_7        // PB7
#define OUTPUT GPIO_PIN_8    // PA8
#define RedLED GPIO_PIN_3    // PB3
#define GreenLED GPIO_PIN_11 // PA11
#define BlueLED GPIO_PIN_12  // PA12

// Variables for pulse widths
uint32_t Red, Green, Blue, Clear;

TIM_HandleTypeDef htim1;
UART_HandleTypeDef huart2;

// Variables for Input Capture
uint32_t captureValue = 0;
uint32_t previousCaptureValue = 0;
uint32_t frequency = 0;

// Function prototypes
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_USART2_UART_Init(void);
static void MX_TIM1_Init(void);
void TIM1_Start_IC(void);
uint32_t MeasurePulseWidth(void);

int main(void)
{
    HAL_Init();
    SystemClock_Config();
    MX_GPIO_Init();
    MX_USART2_UART_Init();
    MX_TIM1_Init();

    // Start Input Capture on TIM1 Channel 1
    TIM1_Start_IC();

    // These lines set the output frequency scaling to 20%
    HAL_GPIO_WritePin(GPIOB, S0, GPIO_PIN_SET);   // Sets S0 to high
    HAL_GPIO_WritePin(GPIOB, S1, GPIO_PIN_RESET); // Sets S1 to low

    while (1)
    {
        // Red measurements
        HAL_GPIO_WritePin(GPIOA, S2, GPIO_PIN_RESET); // Sets S2 to low
        HAL_GPIO_WritePin(GPIOA, S3, GPIO_PIN_RESET); // Sets S3 to low
        Red = MeasurePulseWidth();
        printf("Red Frequency: %lu\n", Red);  // Add this for debugging


        // Green measurements
        HAL_GPIO_WritePin(GPIOA, S2, GPIO_PIN_SET);   // Sets S2 to high
        HAL_GPIO_WritePin(GPIOA, S3, GPIO_PIN_SET);   // Sets S3 to high
        Green = MeasurePulseWidth();
        printf("Green Frequency: %lu\n", Green);  // Add this for debugging

        // Blue measurements
        HAL_GPIO_WritePin(GPIOA, S2, GPIO_PIN_RESET); // Sets S2 to low
        HAL_GPIO_WritePin(GPIOA, S3, GPIO_PIN_SET);   // Sets S3 to high
        Blue = MeasurePulseWidth();
        printf("Blue Frequency: %lu\n", Blue);  // Add this for debugging

        // Map Red, Green, and Blue directly without the Map function
        Red = (Red - 1000) * 255 / (15000 - 1000);
        Green = (Green - 1000) * 255 / (15000 - 1000);
        Blue = (Blue - 1000) * 255 / (15000 - 1000);

        // Turn LEDs on based on detected color
        if(Red > 200 && Green < 150 && Blue < 150) {
            HAL_GPIO_WritePin(GPIOB, RedLED, GPIO_PIN_SET);
            HAL_GPIO_WritePin(GPIOA, GreenLED, GPIO_PIN_RESET);
            HAL_GPIO_WritePin(GPIOA, BlueLED, GPIO_PIN_RESET);
        } else if (Red < 150 && Green > 200 && Blue < 150) {
            HAL_GPIO_WritePin(GPIOB, RedLED, GPIO_PIN_RESET);
            HAL_GPIO_WritePin(GPIOA, GreenLED, GPIO_PIN_SET);
            HAL_GPIO_WritePin(GPIOA, BlueLED, GPIO_PIN_RESET);
        } else if (Red < 100 && Green < 100 && Blue > 200) {
            HAL_GPIO_WritePin(GPIOB, RedLED, GPIO_PIN_RESET);
            HAL_GPIO_WritePin(GPIOA, GreenLED, GPIO_PIN_RESET);
            HAL_GPIO_WritePin(GPIOA, BlueLED, GPIO_PIN_SET);
        }

        // Output to UART
        char msg[50];
        snprintf(msg, sizeof(msg), "Red: %lu | Green: %lu | Blue: %lu\r\n", Red, Green, Blue);
        HAL_UART_Transmit(&huart2, (uint8_t*)msg, strlen(msg), HAL_MAX_DELAY);
        HAL_Delay(100);
    }
}

void TIM1_Start_IC(void) {
    HAL_TIM_IC_Start_IT(&htim1, TIM_CHANNEL_1);
}

uint32_t MeasurePulseWidth(void){
    return frequency;
}

void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim) {
    if (htim->Channel == HAL_TIM_ACTIVE_CHANNEL_1) {
        captureValue = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_1);
        if (captureValue != previousCaptureValue) { // Prevent division by zero
            frequency = HAL_RCC_GetPCLK1Freq() / (captureValue - previousCaptureValue);
        }
        previousCaptureValue = captureValue;
        // Debugging output
        char msg[50];
        snprintf(msg, sizeof(msg), "Frequency: %lu\r\n", frequency);
        HAL_UART_Transmit(&huart2, (uint8_t*)msg, strlen(msg), HAL_MAX_DELAY);
    }
}

void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

  /** Configure the main internal regulator output voltage
  */
  if (HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1) != HAL_OK)
  {
    Error_Handler();
  }

  /** Configure LSE Drive Capability
  */
  HAL_PWR_EnableBkUpAccess();
  __HAL_RCC_LSEDRIVE_CONFIG(RCC_LSEDRIVE_LOW);

  /** Initializes the RCC Oscillators according to the specified parameters
  * in the RCC_OscInitTypeDef structure.
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSE|RCC_OSCILLATORTYPE_MSI;
  RCC_OscInitStruct.LSEState = RCC_LSE_ON;
  RCC_OscInitStruct.MSIState = RCC_MSI_ON;
  RCC_OscInitStruct.MSICalibrationValue = 0;
  RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_6;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_MSI;
  RCC_OscInitStruct.PLL.PLLM = 1;
  RCC_OscInitStruct.PLL.PLLN = 16;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV7;
  RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;
  RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }

  /** Initializes the CPU, AHB and APB buses 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_DIV1;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)
  {
    Error_Handler();
  }

  /** Enable MSI Auto calibration
  */
  HAL_RCCEx_EnableMSIPLLMode();
}

/**
  * @brief TIM1 Initialization Function
  * @param None
  * @retval None
  */
static void MX_TIM1_Init(void)
{

  /* USER CODE BEGIN TIM1_Init 0 */

  /* USER CODE END TIM1_Init 0 */

  TIM_ClockConfigTypeDef sClockSourceConfig = {0};
  TIM_MasterConfigTypeDef sMasterConfig = {0};
  TIM_IC_InitTypeDef sConfigIC = {0};

  /* USER CODE BEGIN TIM1_Init 1 */

  /* USER CODE END TIM1_Init 1 */
  htim1.Instance = TIM1;
  htim1.Init.Prescaler = 31;
  htim1.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim1.Init.Period = 65535;
  htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  htim1.Init.RepetitionCounter = 0;
  htim1.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
  if (HAL_TIM_Base_Init(&htim1) != HAL_OK)
  {
    Error_Handler();
  }
  sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
  if (HAL_TIM_ConfigClockSource(&htim1, &sClockSourceConfig) != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_TIM_IC_Init(&htim1) != HAL_OK)
  {
    Error_Handler();
  }
  sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
  sMasterConfig.MasterOutputTrigger2 = TIM_TRGO2_RESET;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
  if (HAL_TIMEx_MasterConfigSynchronization(&htim1, &sMasterConfig) != HAL_OK)
  {
    Error_Handler();
  }
  sConfigIC.ICPolarity = TIM_INPUTCHANNELPOLARITY_RISING;
  sConfigIC.ICSelection = TIM_ICSELECTION_DIRECTTI;
  sConfigIC.ICPrescaler = TIM_ICPSC_DIV1;
  sConfigIC.ICFilter = 0;
  if (HAL_TIM_IC_ConfigChannel(&htim1, &sConfigIC, TIM_CHANNEL_1) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN TIM1_Init 2 */

  /* USER CODE END TIM1_Init 2 */

}

/**
  * @brief USART2 Initialization Function
  * @param None
  * @retval None
  */
static void MX_USART2_UART_Init(void)
{

  /* USER CODE BEGIN USART2_Init 0 */

  /* USER CODE END USART2_Init 0 */

  /* USER CODE BEGIN USART2_Init 1 */

  /* USER CODE END USART2_Init 1 */
  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();
  }
  /* USER CODE BEGIN USART2_Init 2 */

  /* USER CODE END USART2_Init 2 */

}

/**
  * @brief GPIO Initialization Function
  * @param None
  * @retval None
  */
static void MX_GPIO_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};
/* USER CODE BEGIN MX_GPIO_Init_1 */
/* USER CODE END MX_GPIO_Init_1 */

  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOC_CLK_ENABLE();
  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOA, GPIO_PIN_11|GPIO_PIN_12, GPIO_PIN_RESET);

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOB, GPIO_PIN_3|GPIO_PIN_4|GPIO_PIN_5|GPIO_PIN_6
                          |GPIO_PIN_7, GPIO_PIN_RESET);

  /*Configure GPIO pins : PA11 PA12 */
  GPIO_InitStruct.Pin = GPIO_PIN_11|GPIO_PIN_12;
  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);

  /*Configure GPIO pins : PB3 PB4 PB5 PB6
                           PB7 */
  GPIO_InitStruct.Pin = GPIO_PIN_3|GPIO_PIN_4|GPIO_PIN_5|GPIO_PIN_6
                          |GPIO_PIN_7;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

/* USER CODE BEGIN MX_GPIO_Init_2 */
/* USER CODE END MX_GPIO_Init_2 */
}

/* USER CODE BEGIN 4 */

/* USER CODE END 4 */

/**
  * @brief  This function is executed in case of error occurrence.
  * @retval None
  */
void Error_Handler(void)
{
  /* USER CODE BEGIN Error_Handler_Debug */
  /* User can add his own implementation to report the HAL error return state */
  __disable_irq();
  while (1)
  {
  }
  /* USER CODE END Error_Handler_Debug */
}

#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 CODE BEGIN 6 */
  /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */