STM32学习-使用DMA功能自动更新PWM的输出

ID:81272 · 发表于 2015-5-27 16:28

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使用DMA功能自动更新PWM的输出.RAR (253.23 KB, 下载次数: 181)

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//------------------------------------------------------------------------------
#if (RCC_PLLMul==2) // ok
#define RCC_PLLMul_ RCC_PLLMul_2
#elif (RCC_PLLMul==4)
#define RCC_PLLMul_ RCC_PLLMul_4
#elif (RCC_PLLMul==8)
#define RCC_PLLMul_ RCC_PLLMul_8
#elif (RCC_PLLMul==9)
#define RCC_PLLMul_ RCC_PLLMul_9
#elif (RCC_PLLMul==16)
#define RCC_PLLMul_ RCC_PLLMul_16
#else
error
#endif
#define SYSCLK (float)(FREQ_HSE*RCC_PLLMul)
//------------------------------------------------------------------------------
#if (RCC_AHB_Div==1) // ok
#define RCC_HCLK_Div_ RCC_SYSCLK_Div1
#elif (RCC_AHB_Div==2)
#define RCC_HCLK_Div_ RCC_SYSCLK_Div2
#elif (RCC_AHB_Div==4)
#define RCC_HCLK_Div_ RCC_SYSCLK_Div4
#elif (RCC_AHB_Div==8)
#define RCC_HCLK_Div_ RCC_SYSCLK_Div8
#elif (RCC_AHB_Div==16)
#define RCC_HCLK_Div_ RCC_SYSCLK_Div16
#elif (RCC_AHB_Div==64)
#define RCC_HCLK_Div_ RCC_SYSCLK_Div64
#elif (RCC_AHB_Div==128)
#define RCC_HCLK_Div_ RCC_SYSCLK_Div128
#elif (RCC_AHB_Div==256)
#define RCC_HCLK_Div_ RCC_SYSCLK_Div256
#elif (RCC_AHB_Div==512)
#define RCC_HCLK_Div_ RCC_SYSCLK_Div512
#else
error
#endif
#define HCLK (float)(SYSCLK/RCC_AHB_Div)
#define FCLK (float)(HCLK)
//------------------------------------------------------------------------------
#if (RCC_APB1_Div==1) // ok
#define RCC_PCLK1_Div_ RCC_HCLK_Div1
#elif (RCC_APB1_Div==2)
#define RCC_PCLK1_Div_ RCC_HCLK_Div2
#elif (RCC_APB1_Div==4)
#define RCC_PCLK1_Div_ RCC_HCLK_Div4
#elif (RCC_APB1_Div==8)
#define RCC_PCLK1_Div_ RCC_HCLK_Div8
#elif (RCC_APB1_Div==16)
#define RCC_PCLK1_Div_ RCC_HCLK_Div16
#else
error
#endif
#define PCLK1 (float)(HCLK/RCC_APB1_Div)
//------------------------------------------------------------------------------
#if (RCC_APB2_Div==1) // ok
#define RCC_PCLK2_Div_ RCC_HCLK_Div1
#elif (RCC_APB2_Div==2)
#define RCC_PCLK2_Div_ RCC_HCLK_Div2
#elif (RCC_APB2_Div==4)
#define RCC_PCLK2_Div_ RCC_HCLK_Div4
#elif (RCC_APB2_Div==8)
#define RCC_PCLK2_Div_ RCC_HCLK_Div8
#elif (RCC_APB2_Div==16)
#define RCC_PCLK2_Div_ RCC_HCLK_Div16
#else
error
#endif
#define PCLK2 (float)(HCLK/RCC_APB2_Div)
//------------------------------------------------------------------------------
#if (RCC_ADC_DIV==2)
#define RCC_ADC_DIV_ RCC_PCLK2_Div2
#elif (RCC_ADC_DIV==4)
#define RCC_ADC_DIV_ RCC_PCLK2_Div4
#elif (RCC_ADC_DIV==6)
#define RCC_ADC_DIV_ RCC_PCLK2_Div6
#elif (RCC_ADC_DIV==8)
#define RCC_ADC_DIV_ RCC_PCLK2_Div8
#else
error
#endif
//------------------------------------------------------------------------------
#if (RCC_APB1_Div==1)
#define FACTOR_TIM234567 1
#else
#define FACTOR_TIM234567 2
#endif
#define TIM234567CLK (PCLK1*FACTOR_TIM234567)
#define TIM2CLK TIM234567CLK
#define TIM3CLK TIM234567CLK
#define TIM4CLK TIM234567CLK
#define TIM5CLK TIM234567CLK
#define TIM6CLK TIM234567CLK
#define TIM7CLK TIM234567CLK
//------------------------------------------------------------------------------
#if (RCC_APB2_Div==1)
#define TIM1CLK (PCLK2)
#define TIM8CLK (PCLK2)
#else
#define TIM1CLK (PCLK2*2)
#define TIM8CLK (PCLK2*2)
#endif
//------------------------------------------------------------------------------
#define ADCCLK ((float)PCLK2/RCC_ADC_DIV)
#define ADCCLKx10 (10*FREQ_HSE*RCC_PLLMul/(RCC_AHB_Div*RCC_APB2_Div*RCC_ADC_DIV)) // 仅仅用于下面的判断
#if (ADCCLKx10<6)
error // adc的时钟最小为0.6MHz
#elif (ADCCLKx10>140)
error // adc的时钟最大为14MHz
#else
// 正常的adc频率范围
#endif
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------

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/*******************************************************************************
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 : 2017-04-18
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 0
uint16_t SRC_Buffer[]={72*5};// 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[]={72*2,72*5,72*10,72*20,72*40,72*10};// 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=0; 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 = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
//NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel=TIM1_CC_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
//NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel=DMA1_Channel5_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
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)/2; //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/65536;
++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-1;
TIM_TimeBaseStructure.TIM_Prescaler = TIM_Prescaler-1;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 1-1;// 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 = 72;
/*
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=0;
if (++tmr_100ms>=(100/TIME_TB))
{
tmr_100ms=0;
f_100ms=1;
GPIOC->ODR ^= GPIO_Pin_4; // led5 toogle
}
if (++tmr_1000ms>=(1000/TIME_TB))
{
tmr_1000ms=0;
f_1000ms=1;
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(100); // 延时，等待电压稳定
Tim1_Configuration();
DMA_Configuration();
SysTick_Config1();
NVIC_Configuration();
//------------------------------------------------------------------------------
for(i=0;i<6;++i)
{
//i=0;
//GPIOA->ODR ^= GPIO_Pin_10; // led3 toogle
//GPIOA->ODR ^= GPIO_Pin_11; // led3 toogle
delayms(1);
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 (1)
{
}
}
#endif
//******************************************************************************
/******************* (C) COPYRIGHT 2009 STMicroelectronics *****END OF FILE****/
//******************************************************************************
/*
LED2---------PC7
LED3---------PC6
LED4---------PC5
LED5---------PC4
KEY2---------PD3
KEY3---------PD4
@par Example Description
This example provides a description of how to use DMA with TIM1 Update request
to transfer Data from memory to TIM1 Capture Compare Register3.
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
The TIM1 Channel3 is configured to generate a complementary PWM signal with
a frequency equal to 17.578 KHz and a variable duty cycle that is changed
by the DMA after a specific number of Update event.
The number of this repetitive requests is defined by the TIM1 Repetion counter,
each 3 Update Requests, the TIM1 Channel3 Duty Cycle changes to the next new value
defined by the SRC_Buffer.
- STM3210E-EVAL and STM3210B-EVAL Set-up
- Connect the following pins to an oscilloscope to monitor the different waveforms:
- TIM1 CH3 (PA.10) pin69
- TIM1 CH3N (PB.15) pin54
*/

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ID:82014 · 发表于 2015-6-4 13:54

东西不错啊。。。

ID:103550 · 发表于 2016-1-17 11:40

谢谢分享，51黑有你更精彩！！

ID:110543 · 发表于 2016-3-24 14:56

所有的好东西我都要哇哈哈哈哈

ID:110736 · 发表于 2016-3-26 09:46

谢谢分享

ID:159590 · 发表于 2017-1-3 13:55

正是我想要的，谢谢

ID:91907 · 发表于 2017-1-12 19:08

正是我想要的，谢谢

ID:159524 · 发表于 2017-2-24 09:46

支持一下

ID:232839 · 发表于 2017-9-13 12:10

木有黑币，下载不了源码

ID:232839 · 发表于 2017-9-13 16:06

你好~
这能改变PWM频率吗？还是只改变占空比？

ID:162417 · 发表于 2017-11-3 10:36

正在做自动改变PWM频率的项目，对我帮助很大，但下不了啊！

ID:123983 · 发表于 2018-5-20 22:25

好资源，谢谢

ID:98945 · 发表于 2018-8-16 08:49

支持楼主,好资源

ID:45330 · 发表于 2019-5-26 20:24

好东西要支持啊

ID:547896 · 发表于 2019-5-26 21:50

厉害

ID:524104 · 发表于 2019-5-27 14:14

在要使用这方面的功能，来做可控PWM脉冲数量的PWM输出。

ID:595170 · 发表于 2020-2-2 12:05

学习了，谢谢，很好的参考资料

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