main.c

/**
  ******************************************************************************
  * @file    DAC/DAC_SignalsGeneration/Src/main.c
  * @author  MCD Application Team
  * @brief   This example provides a short description of how to use the DAC
  *          peripheral to generate several signals.
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2017 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file
  * in the root directory of this software component.
  * If no LICENSE file comes with this software, it is provided AS-IS.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "main.h"

/** @addtogroup STM32H7xx_HAL_Examples
  * @{
  */

/** @addtogroup DAC_SignalsGeneration
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
DAC_HandleTypeDef    DacHandle;
static DAC_ChannelConfTypeDef sConfig;
const uint8_t aEscalator8bit[6] = {0x0, 0x33, 0x66, 0x99, 0xCC, 0xFF};
__IO uint8_t ubSelectedWavesForm = 1;
__IO uint8_t ubKeyPressed = SET;

/* Private function prototypes -----------------------------------------------*/
static void MPU_Config(void);
static void DAC_Ch1_TriangleConfig(void);
static void DAC_Ch1_EscalatorConfig(void);
static void TIM6_Config(void);
static void SystemClock_Config(void);
static void Error_Handler(void);

static void CPU_CACHE_Enable(void);
/* Private functions ---------------------------------------------------------*/

/**
  * @brief  Main program.
  * @param  None
  * @retval None
  */
int main(void)
{


  
  /* Configure the MPU attributes */
  MPU_Config();

  /* Enable the CPU Cache */
  CPU_CACHE_Enable();

  /* STM32H7xx HAL library initialization:
       - Systick timer is configured by default as source of time base, but user 
         can eventually implement his proper time base source (a general purpose 
         timer for example or other time source), keeping in mind that Time base 
         duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and 
         handled in milliseconds basis.
       - Set NVIC Group Priority to 4
       - Low Level Initialization
     */
  HAL_Init();

  /* Configure the system clock to 400 MHz */
  SystemClock_Config();
  
   /* Configure LED2 */
  BSP_LED_Init(LED2);

  /* Configure User push-button in Interrupt mode */
  BSP_PB_Init(BUTTON_USER, BUTTON_MODE_EXTI);

  /*##-1- Configure the DAC peripheral #######################################*/
  DacHandle.Instance = DACx;

  /*##-2- Configure the TIM peripheral #######################################*/
  TIM6_Config();

  /* Infinite loop */
  while (1)
  {
    /* If the Key is pressed */
    if (ubKeyPressed != RESET)
    {
      HAL_DAC_DeInit(&DacHandle);

      /* select waves forms according to the User push-button status */
      if (ubSelectedWavesForm == 1)
      {
        /* The triangle wave has been selected */

        /* Triangle Wave generator -------------------------------------------*/
        DAC_Ch1_TriangleConfig();
      }
      else
      {
        /* The escalator wave has been selected */

        /* Escalator Wave generator -------------------------------------------*/
        DAC_Ch1_EscalatorConfig();
      }

      ubKeyPressed = RESET;
    }
  }
}

/**
  * @brief  System Clock Configuration
  *         The system Clock is configured as follow : 
  *            System Clock source            = PLL (HSE BYPASS)
  *            SYSCLK(Hz)                     = 400000000 (CPU Clock)
  *            HCLK(Hz)                       = 200000000 (AXI and AHBs Clock)
  *            AHB Prescaler                  = 2
  *            D1 APB3 Prescaler              = 2 (APB3 Clock  100MHz)
  *            D2 APB1 Prescaler              = 2 (APB1 Clock  100MHz)
  *            D2 APB2 Prescaler              = 2 (APB2 Clock  100MHz)
  *            D3 APB4 Prescaler              = 2 (APB4 Clock  100MHz)
  *            HSE Frequency(Hz)              = 8000000
  *            PLL_M                          = 4
  *            PLL_N                          = 400
  *            PLL_P                          = 2
  *            PLL_Q                          = 4
  *            PLL_R                          = 2
  *            VDD(V)                         = 3.3
  *            Flash Latency(WS)              = 4
  * @param  None
  * @retval None
  */
static void SystemClock_Config(void)
{
  RCC_ClkInitTypeDef RCC_ClkInitStruct;
  RCC_OscInitTypeDef RCC_OscInitStruct;
  HAL_StatusTypeDef ret = HAL_OK;
  
  /*!< Supply configuration update enable */
  HAL_PWREx_ConfigSupply(PWR_LDO_SUPPLY);

  /* The voltage scaling allows optimizing the power consumption when the device is
     clocked below the maximum system frequency, to update the voltage scaling value
     regarding system frequency refer to product datasheet.  */
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);

  while(!__HAL_PWR_GET_FLAG(PWR_FLAG_VOSRDY)) {}
  
  /* Enable HSE Oscillator and activate PLL with HSE as source */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_BYPASS;
  RCC_OscInitStruct.HSIState = RCC_HSI_OFF;
  RCC_OscInitStruct.CSIState = RCC_CSI_OFF;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;

  RCC_OscInitStruct.PLL.PLLM = 4;
  RCC_OscInitStruct.PLL.PLLN = 400;
  RCC_OscInitStruct.PLL.PLLFRACN = 0;
  RCC_OscInitStruct.PLL.PLLP = 2;
  RCC_OscInitStruct.PLL.PLLR = 2;
  RCC_OscInitStruct.PLL.PLLQ = 4;

  RCC_OscInitStruct.PLL.PLLVCOSEL = RCC_PLL1VCOWIDE;
  RCC_OscInitStruct.PLL.PLLRGE = RCC_PLL1VCIRANGE_1;
  ret = HAL_RCC_OscConfig(&RCC_OscInitStruct);
  if(ret != HAL_OK)
  {
    Error_Handler();
  }
  
/* Select PLL as system clock source and configure  bus clocks dividers */
  RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_D1PCLK1 | RCC_CLOCKTYPE_PCLK1 | \
                                 RCC_CLOCKTYPE_PCLK2  | RCC_CLOCKTYPE_D3PCLK1);

  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.SYSCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_HCLK_DIV2;
  RCC_ClkInitStruct.APB3CLKDivider = RCC_APB3_DIV2;  
  RCC_ClkInitStruct.APB1CLKDivider = RCC_APB1_DIV2; 
  RCC_ClkInitStruct.APB2CLKDivider = RCC_APB2_DIV2; 
  RCC_ClkInitStruct.APB4CLKDivider = RCC_APB4_DIV2; 
  ret = HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4);
  if(ret != HAL_OK)
  {
    Error_Handler();
  }

}
/**
  * @brief  This function is executed in case of error occurrence.
  * @param  None
  * @retval None
  */
static void Error_Handler(void)
{
  /* Turn LED2 on */
  BSP_LED_On(LED2);

  while(1)
  {
  }
}

static void DAC_Ch1_EscalatorConfig(void)
{
  /*##-1- Initialize the DAC peripheral ######################################*/
  if (HAL_DAC_Init(&DacHandle) != HAL_OK)
  {
    /* Initialization Error */
    Error_Handler();
  }

  /*##-1- DAC channel1 Configuration #########################################*/
  sConfig.DAC_Trigger = DAC_TRIGGER_T6_TRGO;
  sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE;

  if (HAL_DAC_ConfigChannel(&DacHandle, &sConfig, DACx_CHANNEL) != HAL_OK)
  {
    /* Channel configuration Error */
    Error_Handler();
  }

  /*##-2- Enable DAC selected channel and associated DMA #############################*/
  if (HAL_DAC_Start_DMA(&DacHandle, DACx_CHANNEL, (uint32_t *)aEscalator8bit, 6, DAC_ALIGN_8B_R) != HAL_OK)
  {
    /* Start DMA Error */
    Error_Handler();
  }
}

/**
  * @brief  DAC Channel1 Triangle Configuration
  * @param  None
  * @retval None
  */
static void DAC_Ch1_TriangleConfig(void)
{
  /*##-1- Initialize the DAC peripheral ######################################*/
  if (HAL_DAC_Init(&DacHandle) != HAL_OK)
  {
    /* DAC initialization Error */
    Error_Handler();
  }

  /*##-2- DAC channel2 Configuration #########################################*/
  sConfig.DAC_Trigger = DAC_TRIGGER_T6_TRGO;
  sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE;

  if (HAL_DAC_ConfigChannel(&DacHandle, &sConfig, DACx_CHANNEL) != HAL_OK)
  {
    /* Channel configuration Error */
    Error_Handler();
  }

  /*##-3- DAC channel2 Triangle Wave generation configuration ################*/
  if (HAL_DACEx_TriangleWaveGenerate(&DacHandle, DACx_CHANNEL, DAC_TRIANGLEAMPLITUDE_1023) != HAL_OK)
  {
    /* Triangle wave generation Error */
    Error_Handler();
  }

  /*##-4- Enable DAC Channel1 ################################################*/
  if (HAL_DAC_Start(&DacHandle, DACx_CHANNEL) != HAL_OK)
  {
    /* Start Error */
    Error_Handler();
  }

  /*##-5- Set DAC channel1 DHR12RD register ################################################*/
  if (HAL_DAC_SetValue(&DacHandle, DACx_CHANNEL, DAC_ALIGN_12B_R, 0x100) != HAL_OK)
  {
    /* Setting value Error */
    Error_Handler();
  }
}

/**
  * @brief EXTI line detection callbacks
  * @param GPIO_Pin: Specifies the pins connected EXTI line
  * @retval None
  */
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{ 
  /* Change the wave */
  ubKeyPressed = 1;

  /* Change the selected waves forms */
  ubSelectedWavesForm = !ubSelectedWavesForm;
}

/**
  * @brief  TIM6 Configuration
  * @note   TIM6 configuration is based on APB1 frequency
  * @note   TIM6 Update event occurs each TIM6CLK/256
  * @param  None
  * @retval None
  */
void TIM6_Config(void)
{
  static TIM_HandleTypeDef  htim;
  TIM_MasterConfigTypeDef sMasterConfig;

  /*##-1- Configure the TIM peripheral #######################################*/
  /* Time base configuration */
  htim.Instance = TIM6;

  htim.Init.Period            = 0x7FF;
  htim.Init.Prescaler         = 0;
  htim.Init.ClockDivision     = 0;
  htim.Init.CounterMode       = TIM_COUNTERMODE_UP;
  htim.Init.RepetitionCounter = 0;
  HAL_TIM_Base_Init(&htim);

  /* TIM6 TRGO selection */
  sMasterConfig.MasterOutputTrigger = TIM_TRGO_UPDATE;
  sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;

  HAL_TIMEx_MasterConfigSynchronization(&htim, &sMasterConfig);

  /*##-2- Enable TIM peripheral counter ######################################*/
  HAL_TIM_Base_Start(&htim);
}

/**
  * @brief  Configure the MPU attributes
  * @param  None
  * @retval None
  */
static void MPU_Config(void)
{
  MPU_Region_InitTypeDef MPU_InitStruct;

  /* Disable the MPU */
  HAL_MPU_Disable();

  /* Configure the MPU as Strongly ordered for not defined regions */
  MPU_InitStruct.Enable = MPU_REGION_ENABLE;
  MPU_InitStruct.BaseAddress = 0x00;
  MPU_InitStruct.Size = MPU_REGION_SIZE_4GB;
  MPU_InitStruct.AccessPermission = MPU_REGION_NO_ACCESS;
  MPU_InitStruct.IsBufferable = MPU_ACCESS_NOT_BUFFERABLE;
  MPU_InitStruct.IsCacheable = MPU_ACCESS_NOT_CACHEABLE;
  MPU_InitStruct.IsShareable = MPU_ACCESS_SHAREABLE;
  MPU_InitStruct.Number = MPU_REGION_NUMBER0;
  MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL0;
  MPU_InitStruct.SubRegionDisable = 0x87;
  MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_DISABLE;

  HAL_MPU_ConfigRegion(&MPU_InitStruct);

  /* Enable the MPU */
  HAL_MPU_Enable(MPU_PRIVILEGED_DEFAULT);
}

#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,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */

  /* Infinite loop */
  while (1)
  {
  }
}

#endif



/**
  * @brief  CPU L1-Cache enable.
  * @param  None
  * @retval None
  */
static void CPU_CACHE_Enable(void)
{
  /* Enable I-Cache */
  SCB_EnableICache();

  /* Enable D-Cache */
  SCB_EnableDCache();
}
/**
  * @}
  */

/**
  * @}
  */