STM32学习日志--使用DMA功能自动更新PWM的输出

/*******************************************************************************

 编译环境: EWARM V5.30

 硬件环境: DZY2.PCB

 STM32 FW:   V3.0.0

 作者 : szlihongtao

 ******************************************************************************

 REV  : V1.00

 DATE : 2011-04-18

 NOTE :

 *******************************************************************************/

#include "stm32f10x.h"

#include "stm32_m.h"

#include "dzy.h"

#include "myRCC.h"

//******************************************************************************

#define TIM1_CCR3_Address    0x40012C3C

bit f_tb;    // 基本定时标志

bit f_100ms, f_1000ms;

INT16U cnt_test;  // 计数器，仅供软件调试使用

float clk_sys;   // 仅供软件调试使用

#if 1

uint16_t SRC_Buffer[ ] =

{  *  };   // 由于载波频率取20kHZ，所以最大脉冲宽度不要超50us,即常数不要超过72*50

#else

uint16_t SRC_Buffer[]=

{ *,*,*,*,*,*}; // 由于载波频率取20kHZ，所以最大脉冲宽度不要超50us,即常数不要超过72*50

#endif

//******************************************************************************

// 延时程序，单位为*1ms

//******************************************************************************

void delayms( INT16U cnt )

{

//#define   CONST_1MS  7333   // 72MhZ

//#define   CONST_1MS 3588   // 32MhZ

#define   CONST_1MS (105*FCLK) 

  INT16U i;

  __no_operation( );

  while ( cnt-- )

    for ( i = ; i < CONST_1MS; i++ )

      ;

}

//******************************************************************************

// pcb上的指示灯

//******************************************************************************

static void led_toggle( void )

{

  GPIOC->ODR ^= GPIO_Pin_7;  // led2 toogle

  GPIOC->ODR ^= GPIO_Pin_6;  // led3 toogle

}

//******************************************************************************

// 时钟设置初始化

//******************************************************************************

static void RCC_Configuration( void )

{

  ErrorStatus HSEStartUpStatus;

  /*

   RCC_AdjustHSICalibrationValue 调整内部高速晶振（HSI）校准值

   RCC_ITConfig 使能或者失能指定的RCC中断

   RCC_ClearFlag 清除RCC的复位标志位

   RCC_GetITStatus 检查指定的RCC中断发生与否

   RCC_ClearITPendingBit 清除RCC的中断待处理位

   */

  /* RCC system reset(for debug purpose) */

  // 时钟系统复位

  RCC_DeInit( );

  // 使能外部的8M晶振

  // 设置外部高速晶振（HSE）

  /* Enable HSE */

  RCC_HSEConfig( RCC_HSE_ON );

  // 使能或者失能内部高速晶振（HSI）

  RCC_HSICmd( DISABLE );

  // 等待HSE起振

  // 该函数将等待直到HSE就绪，或者在超时的情况下退出

  /* Wait till HSE is ready */

  HSEStartUpStatus = RCC_WaitForHSEStartUp( );

  if ( HSEStartUpStatus == SUCCESS )

  {

    // 设置AHB时钟（HCLK）

    RCC_HCLKConfig( RCC_HCLK_Div_ ); // 36 MHz

    // 设置低速AHB时钟（PCLK1）

    RCC_PCLK1Config( RCC_PCLK1_Div_ ); // 2.25 MHz

    // 设置高速AHB时钟（PCLK2）

    RCC_PCLK2Config( RCC_PCLK2_Div_ ); // 2.25 MHz

    /* ADCCLK = PCLK2/8 */

    // 设置ADC时钟（ADCCLK）

    RCC_ADCCLKConfig( RCC_ADC_DIV_ ); // 0.281Mhz

    // 设置USB时钟（USBCLK）

    // USB时钟 = PLL时钟除以1.5

    //RCC_USBCLKConfig(RCC_USBCLKSource_PLLCLK_1Div5);

    // 设置外部低速晶振（LSE）

    RCC_LSEConfig( RCC_LSE_OFF );

    // 使能或者失能内部低速晶振（LSI）

    // LSE晶振OFF

    RCC_LSICmd( DISABLE );

    // 设置RTC时钟（RTCCLK）

    // 选择HSE时钟频率除以128作为RTC时钟

    //RCC_RTCCLKConfig(RCC_RTCCLKSource_HSE_Div128);

    // 使能或者失能RTC时钟

    // RTC时钟的新状态

    RCC_RTCCLKCmd( DISABLE );

    /* Flash 2 wait state */

    FLASH_SetLatency( FLASH_Latency_2 );

    /* Enable Prefetch Buffer */

    FLASH_PrefetchBufferCmd( FLASH_PrefetchBuffer_Enable );

    /* PLLCLK = 8MHz * 9 = 72 MHz */

    // 设置PLL时钟源及倍频系数

    RCC_PLLConfig( RCC_PLLSource_HSE_Div1, RCC_PLLMul_ );

    /* Enable PLL */

    // 使能或者失能PLL

    RCC_PLLCmd( ENABLE );

    /* Wait till PLL is ready */

    // 检查指定的RCC标志位设置与否

    while ( RCC_GetFlagStatus( RCC_FLAG_PLLRDY ) == RESET )

    {

    }

    /* Select PLL as system clock source */

    // 设置系统时钟（SYSCLK）

    RCC_SYSCLKConfig( RCC_SYSCLKSource_PLLCLK );

    /* Wait till PLL is used as system clock source */

    // 返回用作系统时钟的时钟源

    while ( RCC_GetSYSCLKSource( ) != 0x08 )

    {

    }

  }

  // 使能或者失能AHB外设时钟

  RCC_AHBPeriphClockCmd(

    RCC_AHBPeriph_DMA1 | RCC_AHBPeriph_DMA2 | RCC_AHBPeriph_SRAM

      | RCC_AHBPeriph_FLITF | RCC_AHBPeriph_CRC | RCC_AHBPeriph_FSMC

      | RCC_AHBPeriph_SDIO, DISABLE );

  // 使能或者失能APB1外设时钟

  RCC_APB1PeriphClockCmd( RCC_APB1Periph_ALL, DISABLE );

  // 强制或者释放高速APB（APB2）外设复位

  RCC_APB2PeriphResetCmd( RCC_APB2Periph_ALL, ENABLE );

  // 退出复位状态

  RCC_APB2PeriphResetCmd( RCC_APB2Periph_ALL, DISABLE );

  // 强制或者释放低速APB（APB1）外设复位

  RCC_APB1PeriphResetCmd( RCC_APB1Periph_ALL, ENABLE );

  // 强制或者释放后备域复位

  RCC_BackupResetCmd( ENABLE );

  // 使能或者失能时钟安全系统

  RCC_ClockSecuritySystemCmd( DISABLE );

}

//******************************************************************************

// NVIC设置

//******************************************************************************

void NVIC_Configuration( void )

{

  NVIC_InitTypeDef NVIC_InitStructure;

  /* Configure one bit for preemption priority */

  NVIC_PriorityGroupConfig( NVIC_PriorityGroup_1 );

  NVIC_InitStructure.NVIC_IRQChannel = TIM1_UP_IRQn;

  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = ;

  NVIC_InitStructure.NVIC_IRQChannelSubPriority = ;

  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

  //NVIC_Init(&NVIC_InitStructure);

  NVIC_InitStructure.NVIC_IRQChannel = TIM1_CC_IRQn;

  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = ;

  NVIC_InitStructure.NVIC_IRQChannelSubPriority = ;

  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

  //NVIC_Init(&NVIC_InitStructure);

  NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel5_IRQn;

  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = ;

  NVIC_InitStructure.NVIC_IRQChannelSubPriority = ;

  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

  NVIC_Init( &NVIC_InitStructure );

}

//******************************************************************************

// SysTick设置初始化

//******************************************************************************

static void SysTick_Config1( void )

{

#if 1

#define SystemFreq  (FCLK*1000000.0)    // 单位为Hz

#define TB_SysTick  (TIME_TB*1000)  // 单位为uS,与示波器实测一致

  static INT32U ticks;

  ticks = ( INT32U )( ( TB_SysTick / 1000000.0 ) * SystemFreq );

  SysTick_Config( ticks );

#endif

}

//******************************************************************************

// GPIO设置

//******************************************************************************

static void GPIO_Configuration( void )

{

  GPIO_InitTypeDef GPIO_InitStructure;

  RCC_APB2PeriphClockCmd(

    RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC

      | RCC_APB2Periph_GPIOD | RCC_APB2Periph_AFIO, ENABLE );

//------------------------------------------------------------------------------

  GPIO_Write( GPIOA, 0xffff );

  /* GPIOA Configuration: Channel 3 as alternate function push-pull */

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;

  GPIO_Init( GPIOA, &GPIO_InitStructure );

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;

  // GPIO_Init(GPIOA, &GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;

  GPIO_Init( GPIOA, &GPIO_InitStructure );

//------------------------------------------------------------------------------

  GPIO_Write( GPIOB, 0xffff ); // 11111101-11111111     

  /* GPIOB Configuration: Channel 3N as alternate function push-pull */

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15;

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;

  GPIO_Init( GPIOB, &GPIO_InitStructure );

  //------------------------------------------------------------------------------

  GPIO_Write( GPIOC, 0xff0f ); // 11111111-00001111

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7 | GPIO_Pin_6 | GPIO_Pin_4

    | GPIO_Pin_5;

  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

  GPIO_Init( GPIOC, &GPIO_InitStructure );

//------------------------------------------------------------------------------

  GPIO_Write( GPIOD, 0xffff ); // 11111111-11111111  

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3 | GPIO_Pin_2;

  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;

  GPIO_Init( GPIOD, &GPIO_InitStructure );

}

//******************************************************************************

void DMA_Configuration( void )

{

  DMA_InitTypeDef DMA_InitStructure;

  RCC_AHBPeriphClockCmd( RCC_AHBPeriph_DMA1, ENABLE );  // dma1时钟使能

  DMA_DeInit( DMA1_Channel5 );   // DMA复位

  DMA_StructInit( &DMA_InitStructure );   // DMA缺省的参数

  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t) TIM1_CCR3_Address; //外设地址

  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t) SRC_Buffer;  //内存地址

  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST; //dma传输方向,单向

  DMA_InitStructure.DMA_BufferSize = sizeof( SRC_Buffer ) / ; //设置DMA在传输时缓冲区的长度

  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //设置DMA的外设递增模式，一个外设

  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;  //设置DMA的内存递增模式，

  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; //外设数据字长

  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;   //内存数据字长

  //循环模式开启，Buffer写满后，自动回到初始地址开始传输

  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;  //设置DMA的传输模式

  DMA_InitStructure.DMA_Priority = DMA_Priority_High; //设置DMA的优先级别

  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;  //设置DMA的2个memory中的变量互相访问

  DMA_Init( DMA1_Channel5, &DMA_InitStructure );

  DMA_ClearFlag( DMA1_IT_TC5 );

  DMA_ITConfig( DMA1_Channel5, DMA_IT_TC, ENABLE );

  DMA_Cmd( DMA1_Channel5, ENABLE );

}

/* TIM1 DMA Transfer example -------------------------------------------------

 TIM1CLK = 72 MHz, Prescaler = 0, TIM1 counter clock = 72 MHz

 The TIM1 Channel3 is configured to generate a complementary PWM signal with

 a frequency equal to: TIM1 counter clock / (TIM1_Period + 1) = 17.57 KHz and

 a variable duty cycle that is changed by the DMA after a specific number of

 Update DMA request.

 The number of this repetitive requests is defined by the TIM1 Repetion counter,

 each 3 Update Requests, the TIM1 Channel 3 Duty Cycle changes to the next new

 value defined by the SRC_Buffer .

 -----------------------------------------------------------------------------*/

//******************************************************************************

void Tim1_Configuration( void )

{

  INT16U TIM_Prescaler, TIM_Period;

  INT32U utemp;

  TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;

  TIM_OCInitTypeDef TIM_OCInitStructure;

  RCC_APB2PeriphClockCmd( RCC_APB2Periph_TIM1, ENABLE );

  TIM_DeInit( TIM1 );

  utemp = ( INT32U )( TIM1CLK * 1000000.0 ) / Freq_PWM;

  TIM_Prescaler = utemp / ;

  ++TIM_Prescaler;                       // 注意这句话，一定要++

  utemp = ( INT32U )( TIM1CLK * 1000000.0 ) / TIM_Prescaler;  // 分频后的定时器输入频率

  TIM_Period = utemp / Freq_PWM;               // 周期常数

  TIM_TimeBaseStructure.TIM_Period = TIM_Period - ;

  TIM_TimeBaseStructure.TIM_Prescaler = TIM_Prescaler - ;

  TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;

  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

  TIM_TimeBaseStructure.TIM_RepetitionCounter =  - ;               // 每次直接更新

  TIM_TimeBaseInit( TIM1, &TIM_TimeBaseStructure );

//------------------------------------------------------------------------------

  /* PWM1 Mode configuration: Channel1 */

  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;

  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; // 使能输出比较状态

  TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Disable; // 失能输出比较N状态

  TIM_OCInitStructure.TIM_Pulse = ;

  /*

   TIM_OCMode_PWM2  TIM_OCPolarity_Low    正脉冲模式

   TIM_OCMode_PWM2  TIM_OCPolarity_High   负脉冲模式

   TIM_OCMode_PWM1  TIM_OCPolarity_Low    负脉冲模式

   TIM_OCMode_PWM1  TIM_OCPolarity_High   正脉冲模式

   TIM1_OCPolarity输出极性---TIM_OCPolarity_High，输出比较极性高,输出的是正脉冲

   TIM1_OCPolarity输出极性---TIM_OCPolarity_Low， 输出比较极性低,输出的是负脉冲

   */

  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;

  TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low; // 互补输出极性

  // 选择空闲状态下的非工作状态

  // 当MOE=0设置TIM1输出比较空闲状态

  // 默认输出位低电平

  TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset;

  // 选择空闲状态下的非工作状态

  // 当MOE=0重置TIM1输出比较N空闲状态

  TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Reset;

  TIM_OC3Init( TIM1, &TIM_OCInitStructure );

  TIM_OC3PreloadConfig( TIM1, TIM_OCPreload_Enable );   // 使能TIMx在CCR1上的预装载寄存器

  /* TIM1 Update DMA Request enable */

  TIM_DMACmd( TIM1, TIM_DMA_Update, ENABLE );

  //TIM_ITConfig(TIM1,TIM_IT_Update,ENABLE); // 定时中断使能

  //TIM_ITConfig(TIM1,TIM_IT_CC3,ENABLE); // 定时中断使能

  TIM_Cmd( TIM1, ENABLE );      // 定时器开始运行

  // 这条语句必须要有!!!

  TIM_CtrlPWMOutputs( TIM1, ENABLE ); /* Main Output Enable */

}

//******************************************************************************

// 基本定时程序,周期为 TIME_TB

//******************************************************************************

static func_tb( void )

{

  static INT16U tmr_100ms;

  static INT16U tmr_1000ms;

  if ( !f_tb )

    return;

  f_tb = ;

  if ( ++tmr_100ms >= (  / TIME_TB ) )

  {

    tmr_100ms = ;

    f_100ms = ;

    GPIOC->ODR ^= GPIO_Pin_4;  // led5 toogle

  }

  if ( ++tmr_1000ms >= (  / TIME_TB ) )

  {

    tmr_1000ms = ;

    f_1000ms = ;

    GPIOC->ODR ^= GPIO_Pin_5;  // led4 toogle

  }

}

//******************************************************************************

// 进入睡眠模式

// 自行编写

//******************************************************************************

void myPWR_EnterSleepMode( void )

{

  //PWR->CR |= CR_CWUF_Set; /* Clear Wake-up flag */

  /* Set SLEEPDEEP bit of Cortex System Control Register */

  //*(__IO uint32_t *) SCB_SysCtrl |= SysCtrl_SLEEPDEEP_Set;

  /* This option is used to ensure that store operations are completed */

  __WFI( ); /* Request Wait For Interrupt */

}

//******************************************************************************

// 主程序

//******************************************************************************

void main( void )

{

  int i;

  RCC_Configuration( );

  GPIO_Configuration( );

  delayms(  );   // 延时，等待电压稳定

  Tim1_Configuration( );

  DMA_Configuration( );

  SysTick_Config1( );

  NVIC_Configuration( );

//------------------------------------------------------------------------------

  for ( i = ; i < ; ++i )

  {

    //i=0;

    //GPIOA->ODR ^= GPIO_Pin_10;  // led3 toogle

    //GPIOA->ODR ^= GPIO_Pin_11;  // led3 toogle

    delayms(  );

    led_toggle( );

  }

//------------------------------------------------------------------------------

  for ( ;; )

  {

    //if (set_sw&0x01)

    //myPWR_EnterSleepMode(); // 休眠，降低功耗

    func_tb( );

  }

}

//******************************************************************************

#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 ()

  {

  }

}

#endif

/**

 ******************************************************************************

 * @file    Project/Template/stm32f10x_it.c

 * @author  MCD Application Team

 * @version V3.0.0

 * @date    04/06/2009

 * @brief   Main Interrupt Service Routines.

 *          This file provides template for all exceptions handler and

 *          peripherals interrupt service routine.

 ******************************************************************************

 * @copy

 *

 * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS

 * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE

 * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY

 * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING

 * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE

 * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.

 *

 * <h2><center>&copy; COPYRIGHT 2009 STMicroelectronics</center></h2>

 */

/* Includes ------------------------------------------------------------------*/

#include "stm32f10x_it.h"

#include "stm32_m.h"

int tt;

extern bit f_tb;        // 基本定时标志

//******************************************************************************

/******************************************************************************/

/*            Cortex-M3 Processor Exceptions Handlers                         */

/******************************************************************************/

/**

 * @brief  This function handles NMI exception.

 * @param  None

 * @retval : None

 */

void NMI_Handler( void )

{

}

/**

 * @brief  This function handles Hard Fault exception.

 * @param  None

 * @retval : None

 */

void HardFault_Handler( void )

{

  /* Go to infinite loop when Hard Fault exception occurs */

  while (  )

  {

  }

}

/**

 * @brief  This function handles Memory Manage exception.

 * @param  None

 * @retval : None

 */

void MemManage_Handler( void )

{

  /* Go to infinite loop when Memory Manage exception occurs */

  while (  )

  {

  }

}

/**

 * @brief  This function handles Bus Fault exception.

 * @param  None

 * @retval : None

 */

void BusFault_Handler( void )

{

  /* Go to infinite loop when Bus Fault exception occurs */

  while (  )

  {

  }

}

/**

 * @brief  This function handles Usage Fault exception.

 * @param  None

 * @retval : None

 */

void UsageFault_Handler( void )

{

  /* Go to infinite loop when Usage Fault exception occurs */

  while (  )

  {

  }

}

/**

 * @brief  This function handles SVCall exception.

 * @param  None

 * @retval : None

 */

void SVC_Handler( void )

{

}

/**

 * @brief  This function handles Debug Monitor exception.

 * @param  None

 * @retval : None

 */

void DebugMon_Handler( void )

{

}

/**

 * @brief  This function handles PendSVC exception.

 * @param  None

 * @retval : None

 */

void PendSV_Handler( void )

{

}

/**

 * @brief  This function handles SysTick Handler.

 * @param  None

 * @retval : None

 */

void SysTick_Handler( void )

{

  f_tb = ;

}

/******************************************************************************/

/*                 STM32F10x Peripherals Interrupt Handlers                   */

/*  Add here the Interrupt Handler for the used peripheral(s) (PPP), for the  */

/*  available peripheral interrupt handler's name please refer to the startup */

/*  file (startup_stm32f10x_xx.s).                                            */

/******************************************************************************/

void TIM1_UP_IRQHandler( void )   // 实际测量，周期为50US

{

  tt = ;

  TIM_ClearITPendingBit( TIM1, TIM_IT_Update );

}

/******************************************************************************/

void TIM1_CC_IRQHandler( void )

{

  tt = ;

  TIM_ClearITPendingBit( TIM1, TIM_IT_CC3 );

} 

/******************************************************************************/

void DMA1_Channel5_IRQHandler( void )

{

  tt = ;

  DMA_ClearITPendingBit( DMA1_IT_TC5 );

  GPIOA->ODR ^= GPIO_Pin_11;    // for test!

}

//******************************************************************************

/******************* (C) COPYRIGHT 2009 STMicroelectronics *****END OF FILE****/

//******************************************************************************

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STM32学习日志--使用DMA功能自动更新PWM的输出

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