关于使用STM32F4定时器触发内部AD采集的问题
时间：10-02
整理：3721RD
点击：
我想通过定时器2，控制内部AD进行64点采样，感觉AD,定时器，DMA都已经配置好了，但是不知道什么原因总是读不出数据。（如果不适用定时器触发，可以通过串口读出AD采样结果），附上代码还请高手帮忙解答，谢谢。
void Timer2_Configuration(void)
{
TIM_TimeBaseInitTypeDef TIM2_TimeBaseStructure;
TIM_OCInitTypeDef TIM2_OCInitStructure;
TIM_DeInit(TIM2);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);
TIM_TimeBaseStructInit(&TIM2_TimeBaseStructure)
TIM2_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_div1
TIM2_TimeBaseStructure.TIM_Prescaler = 42-1;
TIM2_TimeBaseStructure.TIM_Period = 625-1;
TIM2_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2,&TIM2_TimeBaseStructure);
TIM_SelectOutputTrigger(TIM2,TIM_TRGOSource_Update)
////////////////////////////////////////////////////////////////////
TIM2_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1；
TIM2_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable
TIM2_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low
TIM2_OCInitStructure.TIM_Pulse = CCR
TIM_OC2Init(TIM2, & TIM2_OCInitStructure);
TIM_OC2PreloadConfig(TIM2,TIM_OCPreload_Enable)
TIM_ARRPreloadConfig(TIM2,ENABLE);
TIM_Cmd(TIM2,ENABLE);
////////////////////////////////////////////////////////////////////////////////
// TIM_Cmd(TIM2,ENABLE); //?ú???ˉ?¨ê±?÷oˉêyà???ê1?üTIM2
// TIM_InternalClockConfig(TIM2);//éè??TIM2?ú2?ê±?ó
// TIM_UpdateDisableConfig(TIM2,ENABLE);//ê§?üTIM2?üD?ê??t
// TIM_SelectOutputTrigger(TIM2,TIM_TRGOSource_Update);
TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE);
}
void ADC_IO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; /*????òa????μ?GPIOAòy??*/
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; /*éè??òy???￡ê??a?￡?aê?è?*/
GPIO_Init(GPIOA, &GPIO_InitStructure);/*μ÷ó??aoˉêy￡?3?ê??ˉGPIOA*/
}
void ADC1_Mode_Configuration(void)
{
DMA_InitTypeDef DMA_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
ADC_InitTypeDef ADC_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);
DMA_DeInit(DMA2_Stream0);//3?ê??ˉ?÷??′??÷????
DMA_StructInit( &DMA_InitStructure);
/* DMA2 Stream0 channel0 configuration **************************************/
//??è?DMAí¨μà0.êy?Yá÷0
DMA_InitStructure.DMA_Channel = DMA_Channel_0;
//ADCμ??·
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_Address;
//?ú′?μ??·
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADC_ConvertedValue;
//·??ò ′ó?ú′?μ?íaéè.íaéèê?êy?Y?′
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
//êy?Y?o3???
DMA_InitStructure.DMA_BufferSize = 1000;
//íaéèμ??·2???
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
//?ú′?μ??·???ó
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //DMA_MemoryInc_Enable DMA_MemoryInc_Disable
//êy?YààDí?a°?×?
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; //íaéèêy?Yμ￥??
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; //?ú′?êy?Yμ￥??￡o8b
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; //DMA?￡ê?￡o?-?·′?ê?
DMA_InitStructure.DMA_Priority = DMA_Priority_High; //ó??è??￡o?D
//2?ê1ó?FIFO?￡ê?
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable; //
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull; //
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single; //
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
//??ò?é?éè??ó|ó?óúDMA2￡?í¨μà0￡?êy?Yá÷0
DMA_Init(DMA2_Stream0, &DMA_InitStructure);
//ê1?üDMA
DMA_Cmd(DMA2_Stream0, ENABLE);
//????DMA2í¨μàêy?Yá÷0
NVIC_InitStructure.NVIC_IRQChannel=DMA2_Stream0_IRQn;//DMA2_Stream0_IRQHandler;
//?à??ó??è??0
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1;
//?ìó|ó??è??
NVIC_InitStructure.NVIC_IRQChannelSubPriority=4;
//í¨μàê1?ü
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
//??ò?é?????ó|ó?óúNVIC
NVIC_Init(&NVIC_InitStructure);
//ê1?üDMA′?ê?íê3é?D??
DMA_ITConfig(DMA2_Stream0,DMA_IT_TC,ENABLE);
/* -----------------------------------------------------------------------
ADC×a??ê±??:T = T1+T2 = 0.7us + 0.24us = 0.94us?￡′ó??ê?1us,×a???ù?êμèóú￡o1M
-----------------------------------------------------------------------*/
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE); //ADC1ê1ó?APB2ê±?ó￡oHCLK2 = 84M?￡
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b; //éè??12??·?±??ê
ADC_InitStructure.ADC_ScanConvMode = DISABLE; //μ￥í¨μà￡o1?±?é¨?è?￡ê?
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE; //á?D??￡ê?ENABLE,1?±??-?·?￡ê?￡?2éó??¨ê±?÷′￥·￠
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_Rising; //é?éy??′￥·￠
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T2_TRGO;//TIMò?3?′￥·￠?￡ADC_ExternalTrigConv_T2_CC2;ADC_ExternalTrigConv_T2_TRGO
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //êy?Yóò?????￡ê?
ADC_InitStructure.ADC_NbrOfConversion = 1; //éè??ADC×a??í¨μàêy
ADC_Init(ADC1,&ADC_InitStructure);
//ê1?üADC1μ??úDMA?￡ê???á?D?×a??
ADC_DMARequestAfterLastTransferCmd(ADC1,ENABLE);
ADC_DMACmd(ADC1, ENABLE);
/* ADC3 regular channel2 configuration ￡o*/
ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 1, ADC_SampleTime_3Cycles); //????1??ò×é￡?μ?3?μ￥′?×￥??ê±??:T1 = (3+12)/21 = 0.7us
/* Enable ADC1 DMA */
ADC_Cmd(ADC1,ENABLE);
ADC_ExternalTrigInjectedConvConfig(ADC1, TIM_TRGOSource_Update);//TIM_CC1
// ADTIM_SelectOutputTrigger(TIM3, TIM_TRGOSource_Update);
// ADC_ExternalTrigConvCmd(ADC1, ENABLE);
}
void ADC1_Com_Configuration(void)
{
ADC_CommonInitTypeDef ADC_CommonInitStructure;
ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;//?àá￠?￡ê?
/* ---------------------------------------------------------------------
STM32F439ê?2á153ò3￡oVDDA?ú2.4μ?3.6V????ê±￡?×￥???μ?ê×?′ó36M￡??è?¨ê?30M?￡
---------------------------------------------------------------------*/
ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div4; //×￥???μ?ê = HCLK2 / ADC_Prescaler_Div4 = 21M?￡
//ê1ó?ADCμ?DMA?′ó?
ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_2;//ADC_DMAAccessMode_2 ADC_DMAAccessMode_Disabled
//á?′?×￥??????ê±???a5??ADCê±?ó?ü?ú:T2 = 5/21 = 0.24us
ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
//??ò?é?????ó|ó?óúADC_CommonInitStructure
ADC_CommonInit(&ADC_CommonInitStructure);
}
采集不出来数据，还请有高手指点。扣扣：1849962273
void Timer2_Configuration(void)
{
TIM_TimeBaseInitTypeDef TIM2_TimeBaseStructure;
TIM_OCInitTypeDef TIM2_OCInitStructure;
TIM_DeInit(TIM2);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);
TIM_TimeBaseStructInit(&TIM2_TimeBaseStructure)
TIM2_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_div1
TIM2_TimeBaseStructure.TIM_Prescaler = 42-1;
TIM2_TimeBaseStructure.TIM_Period = 625-1;
TIM2_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2,&TIM2_TimeBaseStructure);
TIM_SelectOutputTrigger(TIM2,TIM_TRGOSource_Update)
////////////////////////////////////////////////////////////////////
TIM2_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1；
TIM2_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable
TIM2_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low
TIM2_OCInitStructure.TIM_Pulse = CCR
TIM_OC2Init(TIM2, & TIM2_OCInitStructure);
TIM_OC2PreloadConfig(TIM2,TIM_OCPreload_Enable)
TIM_ARRPreloadConfig(TIM2,ENABLE);
TIM_Cmd(TIM2,ENABLE);
////////////////////////////////////////////////////////////////////////////////
// TIM_Cmd(TIM2,ENABLE); //?ú???ˉ?¨ê±?÷oˉêyà???ê1?üTIM2
// TIM_InternalClockConfig(TIM2);//éè??TIM2?ú2?ê±?ó
// TIM_UpdateDisableConfig(TIM2,ENABLE);//ê§?üTIM2?üD?ê??t
// TIM_SelectOutputTrigger(TIM2,TIM_TRGOSource_Update);
TIM_ITConfig(TIM2,TIM_IT_Update,ENABLE);
}
void ADC_IO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; /*????òa????μ?GPIOAòy??*/
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; /*éè??òy???￡ê??a?￡?aê?è?*/
GPIO_Init(GPIOA, &GPIO_InitStructure);/*μ÷ó??aoˉêy￡?3?ê??ˉGPIOA*/
}
void ADC1_Mode_Configuration(void)
{
DMA_InitTypeDef DMA_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
ADC_InitTypeDef ADC_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);
DMA_DeInit(DMA2_Stream0);//3?ê??ˉ?÷??′??÷????
DMA_StructInit( &DMA_InitStructure);
/* DMA2 Stream0 channel0 configuration **************************************/
//??è?DMAí¨μà0.êy?Yá÷0
DMA_InitStructure.DMA_Channel = DMA_Channel_0;
//ADCμ??·
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_Address;
//?ú′?μ??·
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADC_ConvertedValue;
//·??ò ′ó?ú′?μ?íaéè.íaéèê?êy?Y?′
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
//êy?Y?o3???
DMA_InitStructure.DMA_BufferSize = 1000;
//íaéèμ??·2???
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
//?ú′?μ??·???ó
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //DMA_MemoryInc_Enable DMA_MemoryInc_Disable
//êy?YààDí?a°?×?
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; //íaéèêy?Yμ￥??
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; //?ú′?êy?Yμ￥??￡o8b
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; //DMA?￡ê?￡o?-?·′?ê?
DMA_InitStructure.DMA_Priority = DMA_Priority_High; //ó??è??￡o?D
//2?ê1ó?FIFO?￡ê?
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable; //
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull; //
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single; //
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
//??ò?é?éè??ó|ó?óúDMA2￡?í¨μà0￡?êy?Yá÷0
DMA_Init(DMA2_Stream0, &DMA_InitStructure);
//ê1?üDMA
DMA_Cmd(DMA2_Stream0, ENABLE);
//????DMA2í¨μàêy?Yá÷0
NVIC_InitStructure.NVIC_IRQChannel=DMA2_Stream0_IRQn;//DMA2_Stream0_IRQHandler;
//?à??ó??è??0
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1;
//?ìó|ó??è??
NVIC_InitStructure.NVIC_IRQChannelSubPriority=4;
//í¨μàê1?ü
NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
//??ò?é?????ó|ó?óúNVIC
NVIC_Init(&NVIC_InitStructure);
//ê1?üDMA′?ê?íê3é?D??
DMA_ITConfig(DMA2_Stream0,DMA_IT_TC,ENABLE);
/* -----------------------------------------------------------------------
ADC×a??ê±??:T = T1+T2 = 0.7us + 0.24us = 0.94us?￡′ó??ê?1us,×a???ù?êμèóú￡o1M
-----------------------------------------------------------------------*/
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE); //ADC1ê1ó?APB2ê±?ó￡oHCLK2 = 84M?￡
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b; //éè??12??·?±??ê
ADC_InitStructure.ADC_ScanConvMode = DISABLE; //μ￥í¨μà￡o1?±?é¨?è?￡ê?
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE; //á?D??￡ê?ENABLE,1?±??-?·?￡ê?￡?2éó??¨ê±?÷′￥·￠
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_Rising; //é?éy??′￥·￠
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T2_TRGO;//TIMò?3?′￥·￠?￡ADC_ExternalTrigConv_T2_CC2;ADC_ExternalTrigConv_T2_TRGO
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //êy?Yóò?????￡ê?
ADC_InitStructure.ADC_NbrOfConversion = 1; //éè??ADC×a??í¨μàêy
ADC_Init(ADC1,&ADC_InitStructure);
//ê1?üADC1μ??úDMA?￡ê???á?D?×a??
ADC_DMARequestAfterLastTransferCmd(ADC1,ENABLE);
ADC_DMACmd(ADC1, ENABLE);
/* ADC3 regular channel2 configuration ￡o*/
ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 1, ADC_SampleTime_3Cycles); //????1??ò×é￡?μ?3?μ￥′?×￥??ê±??:T1 = (3+12)/21 = 0.7us
/* Enable ADC1 DMA */
ADC_Cmd(ADC1,ENABLE);
ADC_ExternalTrigInjectedConvConfig(ADC1, TIM_TRGOSource_Update);//TIM_CC1
// ADTIM_SelectOutputTrigger(TIM3, TIM_TRGOSource_Update);
// ADC_ExternalTrigConvCmd(ADC1, ENABLE);
}
void ADC1_Com_Configuration(void)
{
ADC_CommonInitTypeDef ADC_CommonInitStructure;
ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;//?àá￠?￡ê?
/* ---------------------------------------------------------------------
STM32F439ê?2á153ò3￡oVDDA?ú2.4μ?3.6V????ê±￡?×￥???μ?ê×?′ó36M￡??è?¨ê?30M?￡
---------------------------------------------------------------------*/
ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div4; //×￥???μ?ê = HCLK2 / ADC_Prescaler_Div4 = 21M?￡
//ê1ó?ADCμ?DMA?′ó?
ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_2;//ADC_DMAAccessMode_2 ADC_DMAAccessMode_Disabled
//á?′?×￥??????ê±???a5??ADCê±?ó?ü?ú:T2 = 5/21 = 0.24us
ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
//??ò?é?????ó|ó?óúADC_CommonInitStructure
ADC_CommonInit(&ADC_CommonInitStructure);
}
采集不出来数据，还请有高手指点。扣扣：1849962273
现在感觉已经可以读值了，但是感觉不对，还希望有高手能够指点