2019 8 10 STM32F407ADC1M采样频率相关设置
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GPIO_InitTypeDef GPIO_InitStructure; ADC_CommonInitTypeDef ADC_CommonInitStructure; ADC_InitTypeDef ADC_InitStructure; ADC_DeInit(); RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);//ʹÄÜGPIOAʱÖÓ RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE); //ʹÄÜADC1ʱÖÓ //Ïȳõʼ»¯ADC1ͨµÀ5 IO¿Ú GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;//PA5 ͨµÀ5 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;//Ä£ÄâÊäÈë GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;//²»´øÉÏÏÂÀ GPIO_Init(GPIOA, &GPIO_InitStructure);//³õʼ»¯ RCC_APB2PeriphResetCmd(RCC_APB2Periph_ADC1,ENABLE); //ADC1¸´Î» RCC_APB2PeriphResetCmd(RCC_APB2Periph_ADC1,DISABLE); //¸´Î»½áÊø ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;//¶ÀÁ¢Ä£Ê½ ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;//Á½¸ö²ÉÑù½×¶ÎÖ®¼äµÄÑÓ³Ù5¸öʱÖÓ ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled; //DMAʧÄÜ ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div4;//Ô¤·ÖƵ4·ÖƵ¡£ADCCLK=PCLK2/4=84/4=21Mhz,ADCʱÖÓ×îºÃ²»Òª³¬¹ý36Mhz ADC_CommonInit(&ADC_CommonInitStructure);//³õʼ»¯ ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;//12λģʽ ADC_InitStructure.ADC_ScanConvMode = DISABLE;//·ÇɨÃèģʽ ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;//¹Ø±ÕÁ¬Ðøת»» ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_Rising;//´¥·¢¼ì²â,ÉÏÉýÑØ´¥·¢ ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T5_CC1; //TIM5_CC1´¥·¢ ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;//ÓÒ¶ÔÆë ADC_InitStructure.ADC_NbrOfConversion = 1;//1¸öת»»ÔÚ¹æÔòÐòÁÐÖÐ Ò²¾ÍÊÇֻת»»¹æÔòÐòÁÐ1 ADC_Init(ADC1, &ADC_InitStructure);//ADC³õʼ»¯ ADC1->CR2|=0x0200; //ADCDMA循环传输模式，必须把DDS位置1 ADC_DMACmd(ADC1,ENABLE); //400KHz²ÉÑùƵÂÊ£¬2.5us=£¨12+²ÉÑùʱ¼ä£©/21M£¬²ÉÑùʱ¼ä<40.5¸öÖÜÆÚ //1MHZ采样频率，1us = （12+采样时间）/21M 采样时间<9个周期 ADC_Cmd(ADC1, ENABLE);//¿ªÆôADת»»Æ÷ ADC_RegularChannelConfig(ADC1, 5, 1, ADC_SampleTime_3Cycles ); //ADC1,ADCͨµÀ,28¸öÖÜÆÚ
触发时钟TIM5设置
void Timer5_Init(int arr,int psc) TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; // NVIC_InitTypeDef NVIC_InitStructure; //NVIC¿âº¯Êý½á¹¹Ìå TIM_OCInitTypeDef TIM_OCInitStructure; RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE); //ʱÖÓʹÄÜ TIM_TimeBaseStructure.TIM_Period = arr; //ÉèÖÃÔÚÏÂÒ»¸ö¸üÐÂʼþ×°Èë»î¶¯µÄ×Ô¶¯ÖØ×°ÔؼĴæÆ÷ÖÜÆÚµÄÖµ¼ÆÊýµ½10000Ϊ1s TIM_TimeBaseStructure.TIM_Prescaler =psc; //ÉèÖÃÓÃÀ´×÷ΪTIMxʱÖÓƵÂʳýÊýµÄÔ¤·ÖƵֵ10KhzµÄ¼ÆÊýƵÂÊ TIM_TimeBaseStructure.TIM_ClockDivision = 0; //ÉèÖÃʱÖÓ·Ö¸î:TDTS = Tck_tim TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIMÏòÉϼÆÊýģʽ TIM_TimeBaseInit(TIM5, &TIM_TimeBaseStructure); //¸ù¾ÝTIM_TimeBaseInitStructÖÐÖ¸¶¨µÄ²ÎÊý³õʼ»¯TIMxµÄʱ¼ä»ùÊýµ¥Î» //³õʼ»¯TIM5 Channel1 PWMģʽ TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //Ñ¡Ôñ¶¨Ê±Æ÷ģʽ:TIMÂö³å¿í¶Èµ÷ÖÆģʽ2 TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //±È½ÏÊä³öʹÄÜ TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //Êä³ö¼«ÐÔ:TIMÊä³ö±È½Ï¼«ÐÔ¸ß TIM_OCInitStructure.TIM_Pulse=40; TIM_OC1Init(TIM5, &TIM_OCInitStructure); //¸ù¾ÝTÖ¸¶¨µÄ²ÎÊý³õʼ»¯ÍâÉèTIM5 OC1 // //TIM2 NVIC ÅäÖà // NVIC_InitStructure.NVIC_IRQChannel = TIM5_IRQn; //TIM2ÖÐ¶Ï // NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; //ÏÈÕ¼ÓÅÏȼ¶2¼¶ // NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //´ÓÓÅÏȼ¶0¼¶ // NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQͨµÀ±»Ê¹ÄÜ // NVIC_Init(&NVIC_InitStructure); //¸ù¾ÝNVIC_InitStructÖÐÖ¸¶¨µÄ²ÎÊý³õʼ»¯ÍâÉèNVIC¼Ä´æÆ÷ TIM_OC1PreloadConfig(TIM5, TIM_OCPreload_Enable); //ʹÄÜTIM5ÔÚCCR1ÉϵÄԤװÔؼĴæÆ÷ TIM_ARRPreloadConfig(TIM5,ENABLE); //ARPEʹÄÜ TIM_Cmd(TIM5, ENABLE); //ʹÄÜTIMxÍâÉè Timer5_Init(84-1,0);
DMA相关配置，启动了DMA中断
DMA_InitTypeDef DMA_InitStructure; NVIC_InitTypeDef NVIC_InitStructure; //NVIC¿âº¯Êý½á¹¹Ìå if((u32)DMA_Streamx>(u32)DMA2)//µÃµ½µ±Ç°streamÊÇÊôÓÚDMA2»¹ÊÇDMA1 RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2,ENABLE);//DMA2ʱÖÓʹÄÜ else RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1,ENABLE);//DMA1ʱÖÓʹÄÜ DMA_DeInit(DMA_Streamx); while (DMA_GetCmdStatus(DMA_Streamx) != DISABLE)//µÈ´ýDMA¿ÉÅäÖà /* ÅäÖà DMA Stream */ DMA_InitStructure.DMA_Channel = chx; //ͨµÀÑ¡Ôñ DMA_InitStructure.DMA_PeripheralBaseAddr = par; //DMAÍâÉèµØÖ· DMA_InitStructure.DMA_Memory0BaseAddr = mar; //DMA ´æ´¢Æ÷0µØÖ· DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory; //´æ´¢Æ÷µ½ÍâÉèģʽ DMA_InitStructure.DMA_BufferSize = ndtr; //Êý¾Ý´«ÊäÁ¿ DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//ÍâÉè·ÇÔöÁ¿Ä£Ê½ DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //´æ´¢Æ÷ÔöÁ¿Ä£Ê½ DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;//ÍâÉèÊý¾Ý³¤¶È:8λ DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word ;//´æ´¢Æ÷Êý¾Ý³¤¶È:8λ DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; // ʹÓÃÆÕͨģʽ DMA_InitStructure.DMA_Priority = DMA_Priority_Medium; //ÖеÈÓÅÏȼ¶ DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable; DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full; DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single; //´æ´¢Æ÷Í»·¢µ¥´Î´«Êä DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; //ÍâÉèÍ»·¢µ¥´Î´«Êä DMA_Init(DMA_Streamx, &DMA_InitStructure); //³õʼ»¯DMA Stream //DMA NVIC ÅäÖà NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream0_IRQn; //DMAÖÐ¶Ï NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1; //ÏÈÕ¼ÓÅÏȼ¶2¼¶ NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //´ÓÓÅÏȼ¶1¼¶ NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQͨµÀ±»Ê¹ÄÜ NVIC_Init(&NVIC_InitStructure); //¸ù¾ÝNVIC_InitStructÖÐÖ¸¶¨µÄ²ÎÊý³õʼ»¯ÍâÉèNVIC¼Ä´æÆ÷ DMA_ITConfig(DMA2_Stream0,DMA_IT_TC,ENABLE); //¿ªÆôDMA2_Stream0´«ÊäÍê³ÉÖжÏÔ´ //DMA2_Stream0->CR|= (1<<5);
开始一次采样（有同步信号效果更佳）
// DMA_Cmd(DMA2_Stream0, ENABLE); //¿ªÆôDMA´«Êä DMA2_Stream0->CR |= 1; // ADC_Cmd(ADC1, ENABLE);//¿ªÆôADת»»Æ÷ ADC1->CR2 |= 1;
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