[问答]

关于使用STM32F4定时器触发内部AD采集的问题

问答对人有帮助，内容完整，我也想知道答案 0 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); //ÔÚÆô¶¯¶¨Ê±Æ÷º¯ÊýÀïÃæÊ¹ÄÜTIM2 // TIM_InternalClockConfig(TIM2);//ÉèÖÃTIM2ÄÚ²¿Ê±ÖÓ // TIM_UpdateDisableConfig(TIM2,ENABLE);//Ê§ÄÜTIM2¸üÐÂÊÂ¼þ // 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; /Ñ¡ÔñÒª¿ØÖÆµÄGPIOAÒý½Å/ GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; /ÉèÖÃÒý½ÅÄ£Ê½ÎªÄ£ÄâÊäÈë/ GPIO_Init(GPIOA, &GPIO_InitStructure);/µ÷ÓÃ¿âº¯Êý£¬³õÊ¼»¯GPIOA/ } 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);//³õÊ¼»¯¸÷¼Ä´æÆ÷ÅäÖÃ DMA_StructInit( &DMA_InitStructure); /* DMA2 Stream0 channel0 configuration *************************************/ //Ñ¡È¡DMAÍ¨µÀ0.Êý¾ÝÁ÷0 DMA_InitStructure.DMA_Channel = DMA_Channel_0; //ADCµØÖ· DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_Address; //ÄÚ´æµØÖ· DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADC_ConvertedValue; //·½Ïò ´ÓÄÚ´æµ½ÍâÉè.ÍâÉèÊÇÊý¾ÝÔ´ DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory; //Êý¾Ý»º³åÇø DMA_InitStructure.DMA_BufferSize = 1000; //ÍâÉèµØÖ·²»Ôö DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //ÄÚ´æµØÖ·Ôö¼Ó DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //DMA_MemoryInc_Enable DMA_MemoryInc_Disable //Êý¾ÝÀàÐÍÎª°ë×Ö DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; //ÍâÉèÊý¾Ýµ¥Î» DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; //ÄÚ´æÊý¾Ýµ¥Î»£º8b DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; //DMAÄ£Ê½£ºÑ»·´«Êä DMA_InitStructure.DMA_Priority = DMA_Priority_High; //ÓÅÏÈ¼¶£ºÖÐ //²»Ê¹ÓÃFIFOÄ£Ê½ 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; //½«ÒÔÉÏÉèÖÃÓ¦ÓÃÓÚDMA2£¬Í¨µÀ0£¬Êý¾ÝÁ÷0 DMA_Init(DMA2_Stream0, &DMA_InitStructure); //Ê¹ÄÜDMA DMA_Cmd(DMA2_Stream0, ENABLE); //Ñ¡ÔñDMA2Í¨µÀÊý¾ÝÁ÷0 NVIC_InitStructure.NVIC_IRQChannel=DMA2_Stream0_IRQn;//DMA2_Stream0_IRQHandler; //ÇÀÕ¼ÓÅÏÈ¼¶0 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1; //ÏìÓ¦ÓÅÏÈ¼¶ NVIC_InitStructure.NVIC_IRQChannelSubPriority=4; //Í¨µÀÊ¹ÄÜ NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE; //½«ÒÔÉÏÅäÖÃÓ¦ÓÃÓÚNVIC NVIC_Init(&NVIC_InitStructure); //Ê¹ÄÜDMA´«ÊäÍê³ÉÖÐ¶Ï DMA_ITConfig(DMA2_Stream0,DMA_IT_TC,ENABLE); / ----------------------------------------------------------------------- ADC×ª»»Ê±¼ä:T = T1+T2 = 0.7us + 0.24us = 0.94us¡£´óÔ¼ÊÇ1us,×ª»»ËÙÂÊµÈÓÚ£º1M -----------------------------------------------------------------------/ RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE); //ADC1Ê¹ÓÃAPB2Ê±ÖÓ£ºHCLK2 = 84M¡£ ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b; //ÉèÖÃ12Î»·Ö±æÂÊ ADC_InitStructure.ADC_ScanConvMode = DISABLE; //µ¥Í¨µÀ£º¹Ø±ÕÉ¨ÃèÄ£Ê½ ADC_InitStructure.ADC_ContinuousConvMode = DISABLE; //Á¬ÐøÄ£Ê½ENABLE,¹Ø±ÕÑ»·Ä£Ê½£¬²ÉÓÃ¶¨Ê±Æ÷´¥·¢ ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_Rising; //ÉÏÉýÑØ´¥·¢ ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T2_TRGO;//TIMÒç³ö´¥·¢¡£ADC_ExternalTrigConv_T2_CC2;ADC_ExternalTrigConv_T2_TRGO ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //Êý¾ÝÓÒ¶ÔÆëÄ£Ê½ ADC_InitStructure.ADC_NbrOfConversion = 1; //ÉèÖÃADC×ª»»Í¨µÀÊý ADC_Init(ADC1,&ADC_InitStructure); //Ê¹ÄÜADC1µÄÔÚDMAÄ£Ê½ÏÂÁ¬Ðø×ª»» ADC_DMARequestAfterLastTransferCmd(ADC1,ENABLE); ADC_DMACmd(ADC1, ENABLE); / ADC3 regular channel2 configuration £º/ ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 1, ADC_SampleTime_3Cycles); //ÅäÖÃ¹æÔò×é£¬µÃ³öµ¥´Î×¥»»Ê±¼ä: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¢Ä£Ê½ / --------------------------------------------------------------------- STM32F439ÊÖ²á153Ò³£ºVDDAÔÚ2.4µ½3.6VÖ®¼äÊ±£¬×¥»»ÆµÂÊ×î´ó36M£¬ÎÈ¶¨ÊÇ30M¡£ ---------------------------------------------------------------------*/ ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div4; //×¥»»ÆµÂÊ = HCLK2 / ADC_Prescaler_Div4 = 21M¡£ //Ê¹ÓÃADCµÄDMA¸´ÓÃ ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_2;//ADC_DMAAccessMode_2 ADC_DMAAccessMode_Disabled //Á½´Î×¥»»¼ä¸ôÊ±¼äÎª5¸öADCÊ±ÖÓÖÜÆÚ:T2 = 5/21 = 0.24us ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles; //½«ÒÔÉÏÅäÖÃÓ¦ÓÃÓÚADC_CommonInitStructure ADC_CommonInit(&ADC_CommonInitStructure); } 采集不出来数据，还请有高手指点。扣扣：1849962273 0
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答案对人有帮助，有参考价值 0 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

2015-7-7 15:55:12 评论举报 lushiying