it works, needs ctr value

Core/Src/main.c

@@ -18,10 +18,12 @@
 /* USER CODE END Header */
 /* Includes ------------------------------------------------------------------*/
 #include "main.h"
-#include "stm32f4xx_hal_tim.h"
+#include "stm32f4xx_hal_uart.h"
 
 /* Private includes ----------------------------------------------------------*/
 /* USER CODE BEGIN Includes */
+#include <stdint.h>
+#include <stdio.h>
 
 /* USER CODE END Includes */
 
@@ -45,6 +47,8 @@ ADC_HandleTypeDef hadc1;
 
 TIM_HandleTypeDef htim1;
 
+UART_HandleTypeDef huart1;
+
 /* USER CODE BEGIN PV */
 uint16_t duty;
 int ctr = 7999; // or 65534?
@@ -56,6 +60,7 @@ void SystemClock_Config(void);
 static void MX_GPIO_Init(void);
 static void MX_ADC1_Init(void);
 static void MX_TIM1_Init(void);
+static void MX_USART1_UART_Init(void);
 /* USER CODE BEGIN PFP */
 
 /* USER CODE END PFP */
@@ -96,9 +101,10 @@ int main(void)
   MX_GPIO_Init();
   MX_ADC1_Init();
   MX_TIM1_Init();
+  MX_USART1_UART_Init();
   /* USER CODE BEGIN 2 */
   uint16_t val_raw;
-  //float voltage;
+  float proc;
 
   HAL_GPIO_WritePin(LED_ERR_GPIO_Port, LED_ERR_Pin, GPIO_PIN_RESET);
   HAL_GPIO_WritePin(LED_ON_GPIO_Port, LED_ON_Pin, GPIO_PIN_SET);
@@ -117,14 +123,24 @@ int main(void)
 
     val_raw = HAL_ADC_GetValue(&hadc1);
 
-    //duty = (((val_raw/4096)*ctr)/ctr)*100;
+    /*
+     * Mapping % of 4096 to % of counter value
+     * (i.e. 100/4096 --> 200/8912)
+     */
+    proc = (float)val_raw / 4096;
+    proc *= ctr;
+    duty = (uint16_t)proc;
 
-    duty = 6000;
+    printf("duty:%u        proc:%u        raw:%u\r\n", duty, (uint16_t)proc, val_raw);
+    //printf("duty:%u        raw:%u\r\n", duty, val_raw);
+
+    /* Cap it */
+    if (duty > ctr)
+      duty = ctr;
 
-    //duty = (uint16_t)(val_raw/4096);
     __HAL_TIM_SET_COMPARE(&htim1, TIM_CHANNEL_4, duty);
 
-    HAL_Delay(500);
+    HAL_Delay(100);
     /* USER CODE END WHILE */
 
     /* USER CODE BEGIN 3 */
@@ -332,6 +348,39 @@ static void MX_TIM1_Init(void)
 
 }
 
+/**
+  * @brief USART1 Initialization Function
+  * @param None
+  * @retval None
+  */
+static void MX_USART1_UART_Init(void)
+{
+
+  /* USER CODE BEGIN USART1_Init 0 */
+
+  /* USER CODE END USART1_Init 0 */
+
+  /* USER CODE BEGIN USART1_Init 1 */
+
+  /* USER CODE END USART1_Init 1 */
+  huart1.Instance = USART1;
+  huart1.Init.BaudRate = 115200;
+  huart1.Init.WordLength = UART_WORDLENGTH_8B;
+  huart1.Init.StopBits = UART_STOPBITS_1;
+  huart1.Init.Parity = UART_PARITY_NONE;
+  huart1.Init.Mode = UART_MODE_TX_RX;
+  huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
+  huart1.Init.OverSampling = UART_OVERSAMPLING_16;
+  if (HAL_UART_Init(&huart1) != HAL_OK)
+  {
+    Error_Handler();
+  }
+  /* USER CODE BEGIN USART1_Init 2 */
+
+  /* USER CODE END USART1_Init 2 */
+
+}
+
 /**
   * @brief GPIO Initialization Function
   * @param None
@@ -364,6 +413,13 @@ static void MX_GPIO_Init(void)
 }
 
 /* USER CODE BEGIN 4 */
+int
+__io_putchar(int ch)
+{
+  uint8_t c = ch;
+  HAL_UART_Transmit(&huart1, &c, 1, HAL_MAX_DELAY);
+  return ch;
+}
 
 /* USER CODE END 4 */
 

Core/Src/stm32f4xx_hal_msp.c

@@ -214,6 +214,72 @@ void HAL_TIM_Base_MspDeInit(TIM_HandleTypeDef* htim_base)
 
 }
 
+/**
+  * @brief UART MSP Initialization
+  * This function configures the hardware resources used in this example
+  * @param huart: UART handle pointer
+  * @retval None
+  */
+void HAL_UART_MspInit(UART_HandleTypeDef* huart)
+{
+  GPIO_InitTypeDef GPIO_InitStruct = {0};
+  if(huart->Instance==USART1)
+  {
+    /* USER CODE BEGIN USART1_MspInit 0 */
+
+    /* USER CODE END USART1_MspInit 0 */
+    /* Peripheral clock enable */
+    __HAL_RCC_USART1_CLK_ENABLE();
+
+    __HAL_RCC_GPIOA_CLK_ENABLE();
+    /**USART1 GPIO Configuration
+    PA9     ------> USART1_TX
+    PA10     ------> USART1_RX
+    */
+    GPIO_InitStruct.Pin = GPIO_PIN_9|GPIO_PIN_10;
+    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+    GPIO_InitStruct.Pull = GPIO_NOPULL;
+    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
+    GPIO_InitStruct.Alternate = GPIO_AF7_USART1;
+    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
+
+    /* USER CODE BEGIN USART1_MspInit 1 */
+
+    /* USER CODE END USART1_MspInit 1 */
+
+  }
+
+}
+
+/**
+  * @brief UART MSP De-Initialization
+  * This function freeze the hardware resources used in this example
+  * @param huart: UART handle pointer
+  * @retval None
+  */
+void HAL_UART_MspDeInit(UART_HandleTypeDef* huart)
+{
+  if(huart->Instance==USART1)
+  {
+    /* USER CODE BEGIN USART1_MspDeInit 0 */
+
+    /* USER CODE END USART1_MspDeInit 0 */
+    /* Peripheral clock disable */
+    __HAL_RCC_USART1_CLK_DISABLE();
+
+    /**USART1 GPIO Configuration
+    PA9     ------> USART1_TX
+    PA10     ------> USART1_RX
+    */
+    HAL_GPIO_DeInit(GPIOA, GPIO_PIN_9|GPIO_PIN_10);
+
+    /* USER CODE BEGIN USART1_MspDeInit 1 */
+
+    /* USER CODE END USART1_MspDeInit 1 */
+  }
+
+}
+
 /* USER CODE BEGIN 1 */
 
 /* USER CODE END 1 */