[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
2015-7-7 14:08:30　　评论淘帖0 邀请回答您可以邀请以下用户，快速回答问题 × richthoffen 该类别下有 182 个回答。邀请回答 7vyydyfwef 该类别下有 57 个回答。邀请回答我是卖报的小男孩该类别下有 32 个回答，其中被选为最佳答案 1 次。邀请回答 chenbingjy 该类别下有 31 个回答。邀请回答谦谦三君子该类别下有 27 个回答。邀请回答短短该类别下有 25 个回答。邀请回答 nvuuweew 该类别下有 22 个回答。邀请回答 YY599566 该类别下有 22 个回答。邀请回答 dingyang598 该类别下有 22 个回答，其中被选为最佳答案 1 次。邀请回答 hapyy 该类别下有 19 个回答。邀请回答 h1654155957.9572 该类别下有 19 个回答。邀请回答 60user16 该类别下有 19 个回答。邀请回答 huhu12 该类别下有 18 个回答。邀请回答 HEHELA 该类别下有 18 个回答。邀请回答 DerSohn 该类别下有 18 个回答。邀请回答天地直方该类别下有 15 个回答。邀请回答 dull20112011 该类别下有 15 个回答。邀请回答陈军该类别下有 15 个回答。邀请回答 csz9981 该类别下有 15 个回答。邀请回答 UserMen 该类别下有 14 个回答。邀请回答举报 lushiying 相关推荐 • STM32F4的通用定时器有何特点及应用呢 1058 • STM32F4定时器中断的作用是什么？ 1312 • STM32F4定时器的计数器模式有哪几种呢 2759 • 基于STM32F4的阵列传感器数据采集的问题 4937 • 如何对STM32F4的通用定时器进行配置呢 1315 • STM32F4的基本定时器是由哪些部分组成的 819 • stm32f4定时器基本应用是什么？ 702 • STM32f4嘀嗒定时器包含哪几个寄存器呢 1223 • 萌新求助，求大佬分享STM32F4定时器的知识点 646 • 如何通过STM32F4定时器输出固定数量PWM脉冲？ 1791 1个回答

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