269 lines
9.2 KiB
C
269 lines
9.2 KiB
C
/**
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******************************************************************************
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* @file TIM/TIM_DMA/Src/main.c
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* @author MCD Application Team
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* @brief This sample code shows how to use DMA with TIM1 Update request to
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* transfer Data from memory to TIM1 Capture Compare Register 3 (CCR3).
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******************************************************************************
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* @attention
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*
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* <h2><center>© Copyright (c) 2016 STMicroelectronics.
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* All rights reserved.</center></h2>
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*
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* This software component is licensed by ST under BSD 3-Clause license,
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* the "License"; You may not use this file except in compliance with the
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* License. You may obtain a copy of the License at:
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* opensource.org/licenses/BSD-3-Clause
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*
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******************************************************************************
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*/
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/* Includes ------------------------------------------------------------------*/
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#include "main.h"
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/** @addtogroup STM32F1xx_HAL_Examples
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* @{
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*/
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/** @addtogroup TIM_DMA
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* @{
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*/
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/* Private typedef -----------------------------------------------------------*/
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/* Private define ------------------------------------------------------------*/
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/* Private macro -------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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/* Timer handler declaration */
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TIM_HandleTypeDef TimHandle;
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/* Timer Output Compare Configuration Structure declaration */
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TIM_OC_InitTypeDef sConfig;
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/* Capture Compare buffer */
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uint32_t aCCValue_Buffer[3] = {0, 0, 0};
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/* Timer Period*/
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uint32_t uwTimerPeriod = 0;
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/* Private function prototypes -----------------------------------------------*/
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void SystemClock_Config(void);
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static void Error_Handler(void);
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/* Private functions ---------------------------------------------------------*/
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/**
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* @brief Main program.
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* @param None
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* @retval None
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*/
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int main(void)
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{
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/* This sample code shows how to use DMA with TIM1 Update request to transfer
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Data from memory to TIM1 Capture Compare Register 3 (CCR3), through the
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STM32F1xx HAL API. To proceed, 3 steps are required */
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/* STM32F103xB HAL library initialization:
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- Configure the Flash prefetch
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- Systick timer is configured by default as source of time base, but user
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can eventually implement his proper time base source (a general purpose
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timer for example or other time source), keeping in mind that Time base
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duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and
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handled in milliseconds basis.
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- Set NVIC Group Priority to 4
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- Low Level Initialization
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*/
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HAL_Init();
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/* Configure the system clock to 64 MHz */
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SystemClock_Config();
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/* Configure LED2 */
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BSP_LED_Init(LED2);
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/* Compute the value of ARR regiter to generate signal frequency at 17.57 Khz */
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uwTimerPeriod = (uint32_t)((SystemCoreClock / 17570) - 1);
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/* Compute CCR1 value to generate a duty cycle at 75% */
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aCCValue_Buffer[0] = (uint32_t)(((uint32_t) 75 * (uwTimerPeriod - 1)) / 100);
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/* Compute CCR2 value to generate a duty cycle at 50% */
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aCCValue_Buffer[1] = (uint32_t)(((uint32_t) 50 * (uwTimerPeriod - 1)) / 100);
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/* Compute CCR3 value to generate a duty cycle at 25% */
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aCCValue_Buffer[2] = (uint32_t)(((uint32_t) 25 * (uwTimerPeriod - 1)) / 100);
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/*##-1- Configure the TIM peripheral #######################################*/
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/* ---------------------------------------------------------------------------
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TIM1 input clock (TIM1CLK) is set to APB2 clock (PCLK2), since APB2
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prescaler is 1.
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TIM1CLK = PCLK2
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PCLK2 = HCLK
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=> TIM1CLK = HCLK = SystemCoreClock
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TIM1CLK = SystemCoreClock, Prescaler = 0, TIM1 counter clock = SystemCoreClock
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SystemCoreClock is set to 64 MHz for STM32F1xx devices.
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The objective is to configure TIM1 channel 3 to generate a PWM
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signal with a frequency equal to 17.57 KHz:
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- TIM1_Period = (SystemCoreClock / 17570) - 1
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and a variable duty cycle that is changed by the DMA after a specific number of
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Update DMA request.
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The number of this repetitive requests is defined by the TIM1 Repetion counter,
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each 4 Update Requests, the TIM1 Channel 3 Duty Cycle changes to the next new
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value defined by the aCCValue_Buffer.
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Note:
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SystemCoreClock variable holds HCLK frequency and is defined in system_stm32f1xx.c file.
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Each time the core clock (HCLK) changes, user had to update SystemCoreClock
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variable value. Otherwise, any configuration based on this variable will be incorrect.
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This variable is updated in three ways:
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1) by calling CMSIS function SystemCoreClockUpdate()
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2) by calling HAL API function HAL_RCC_GetSysClockFreq()
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3) each time HAL_RCC_ClockConfig() is called to configure the system clock frequency
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-----------------------------------------------------------------------------*/
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/* Initialize TIM1 peripheral as follows:
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+ Period = TimerPeriod (To have an output frequency equal to 17.570 KHz)
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+ Repetition Counter = 3
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+ Prescaler = 0
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+ ClockDivision = 0
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+ Counter direction = Up
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*/
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TimHandle.Instance = TIMx;
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TimHandle.Init.Period = uwTimerPeriod;
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TimHandle.Init.RepetitionCounter = 3;
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TimHandle.Init.Prescaler = 0;
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TimHandle.Init.ClockDivision = 0;
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TimHandle.Init.CounterMode = TIM_COUNTERMODE_UP;
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TimHandle.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
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if (HAL_TIM_PWM_Init(&TimHandle) != HAL_OK)
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{
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/* Initialization Error */
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Error_Handler();
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}
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/*##-2- Configure the PWM channel 3 ########################################*/
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sConfig.OCMode = TIM_OCMODE_PWM1;
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sConfig.OCPolarity = TIM_OCPOLARITY_HIGH;
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sConfig.Pulse = aCCValue_Buffer[0];
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sConfig.OCNPolarity = TIM_OCNPOLARITY_HIGH;
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sConfig.OCFastMode = TIM_OCFAST_DISABLE;
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sConfig.OCIdleState = TIM_OCIDLESTATE_RESET;
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sConfig.OCNIdleState = TIM_OCNIDLESTATE_RESET;
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if (HAL_TIM_PWM_ConfigChannel(&TimHandle, &sConfig, TIM_CHANNEL_3) != HAL_OK)
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{
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/* Configuration Error */
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Error_Handler();
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}
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/*##-3- Start PWM signal generation in DMA mode ############################*/
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if (HAL_TIM_PWM_Start_DMA(&TimHandle, TIM_CHANNEL_3, aCCValue_Buffer, 3) != HAL_OK)
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{
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/* Starting Error */
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Error_Handler();
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}
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while (1)
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{
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}
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}
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/**
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* @brief This function is executed in case of error occurrence.
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* @param None
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* @retval None
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*/
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static void Error_Handler(void)
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{
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/* Turn LED2 on */
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BSP_LED_On(LED2);
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while (1)
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{
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}
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}
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/**
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* @brief System Clock Configuration
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* The system Clock is configured as follow :
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* System Clock source = PLL (HSI)
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* SYSCLK(Hz) = 64000000
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* HCLK(Hz) = 64000000
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* AHB Prescaler = 1
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* APB1 Prescaler = 2
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* APB2 Prescaler = 1
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* PLLMUL = 16
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* Flash Latency(WS) = 2
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* @param None
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* @retval None
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*/
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void SystemClock_Config(void)
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{
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RCC_ClkInitTypeDef clkinitstruct = {0};
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RCC_OscInitTypeDef oscinitstruct = {0};
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/* Configure PLL ------------------------------------------------------*/
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/* PLL configuration: PLLCLK = (HSI / 2) * PLLMUL = (8 / 2) * 16 = 64 MHz */
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/* PREDIV1 configuration: PREDIV1CLK = PLLCLK / HSEPredivValue = 64 / 1 = 64 MHz */
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/* Enable HSI and activate PLL with HSi_DIV2 as source */
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oscinitstruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
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oscinitstruct.HSEState = RCC_HSE_OFF;
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oscinitstruct.LSEState = RCC_LSE_OFF;
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oscinitstruct.HSIState = RCC_HSI_ON;
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oscinitstruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
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oscinitstruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
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oscinitstruct.PLL.PLLState = RCC_PLL_ON;
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oscinitstruct.PLL.PLLSource = RCC_PLLSOURCE_HSI_DIV2;
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oscinitstruct.PLL.PLLMUL = RCC_PLL_MUL16;
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if (HAL_RCC_OscConfig(&oscinitstruct)!= HAL_OK)
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{
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/* Initialization Error */
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while(1);
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}
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/* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2
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clocks dividers */
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clkinitstruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
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clkinitstruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
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clkinitstruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
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clkinitstruct.APB2CLKDivider = RCC_HCLK_DIV1;
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clkinitstruct.APB1CLKDivider = RCC_HCLK_DIV2;
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if (HAL_RCC_ClockConfig(&clkinitstruct, FLASH_LATENCY_2)!= HAL_OK)
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{
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/* Initialization Error */
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while(1);
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}
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}
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#ifdef USE_FULL_ASSERT
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/**
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* @brief Reports the name of the source file and the source line number
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* where the assert_param error has occurred.
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* @param file: pointer to the source file name
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* @param line: assert_param error line source number
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* @retval None
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*/
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void assert_failed(uint8_t *file, uint32_t line)
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{
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/* User can add his own implementation to report the file name and line number,
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ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
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/* Infinite loop */
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while (1)
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{
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}
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}
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#endif
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/**
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* @}
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*/
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/**
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* @}
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*/
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/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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