【stm32F429开发日志】+DMA_ADC+2048FFT+TIM采样

德华发表于 2014-7-11 19:58:33

【stm32F429开发日志】+DMA_ADC+2048FFT+TIM采样

最近比较忙一直没上传，如有问题直接帖子里问一起探讨一下FFT
第一：随意控制采样率
第二：采样点数可控，可以用于FFT

德华发表于 2014-7-22 10:44:55

RE:【stm32F429开发日志】+DMA_ADC+2048FFT+TIM采样

static void ADC3_CH13_DMA_Config(void)
{
ADC_InitTypeDef    ADC_InitStructure;
ADC_CommonInitTypeDef ADC_CommonInitStructure;
DMA_InitTypeDef    DMA_InitStructure;
GPIO_InitTypeDef    GPIO_InitStructure;
/* Enable ADC3, DMA2 and GPIO clocks ****************************************/
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2 | RCC_AHB1Periph_GPIOC, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC3, ENABLE);
/* DMA2 Stream0 channel2 configuration **************************************/
DMA_InitStructure.DMA_Channel = DMA_Channel_2;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC3_DR_ADDRESS;
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADC3ConvertedValue;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
DMA_InitStructure.DMA_BufferSize = 2048;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
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;
DMA_Init(DMA2_Stream0, &DMA_InitStructure);
DMA_Cmd(DMA2_Stream0, ENABLE);

/* Configure ADC3 Channel13 pin as analog input ******************************/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
GPIO_Init(GPIOC, &GPIO_InitStructure);
/* ADC Common Init **********************************************************/
ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;
ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
ADC_CommonInit(&ADC_CommonInitStructure);
/* ADC3 Init ****************************************************************/
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStructure.ADC_ScanConvMode = DISABLE;
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfConversion = 1;
ADC_Init(ADC3, &ADC_InitStructure);
/* ADC3 regular channel13 configuration *************************************/
ADC_RegularChannelConfig(ADC3, ADC_Channel_13, 1, ADC_SampleTime_84Cycles);
/* Enable DMA request after last transfer (Single-ADC mode) */
ADC_DMARequestAfterLastTransferCmd(ADC3, ENABLE);
/* Enable ADC3 DMA */
ADC_DMACmd(ADC3, ENABLE);
DMA_ITConfig(DMA2_Stream0,DMA_IT_TC , ENABLE);
/* Enable ADC3 */
ADC_Cmd(ADC3, ENABLE);
}
void TIM_Config(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDefTIM_OCInitStructure;
uint16_t PrescalerValue = 0;
/* The TIM3 INPUT CLOCK is 42MHz*/
PrescalerValue = (uint16_t) ((SystemCoreClock /2) / 8000000) - 1;

// 40KHz ADC ????
TIM_TimeBaseStructure.TIM_Period = 99;
TIM_TimeBaseStructure.TIM_Prescaler = PrescalerValue;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

TIM_PrescalerConfig(TIM3, PrescalerValue, TIM_PSCReloadMode_Immediate);
// TIM3 CH1 50%
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Timing;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 50;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM3, &TIM_OCInitStructure);

TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Disable);

TIM_ITConfig(TIM3, TIM_IT_CC1 , ENABLE);

//TIM_ARRPreloadConfig(TIM3, ENABLE);

/* TIM3 enable counter */
TIM_Cmd(TIM3, ENABLE);
}
void NVIC_Config(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
/* Enable the TIM3 gloabal Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

/* Enable the DMA2_Stream0 gloabal Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

}
#ifdefUSE_FULL_ASSERT

jimielee 发表于 2014-7-16 21:20:21

RE:【stm32F429开发日志】+DMA_ADC+2048FFT+TIM采样

楼主下载下来是乱码啊

水晶墨尔本 发表于 2015-5-12 12:41:22

德华发表于 2014-7-22 10:44
static void ADC3_CH13_DMA_Config(void)
{
ADC_InitTypeDef ADC_InitStructure;

您这个是官方历程？不是一个AD检测带FFT检测频率的系统？在代码里没看到FFT啊

泉水叮咚 发表于 2014-7-26 19:40:29

RE:【stm32F429开发日志】+DMA_ADC+2048FFT+TIM采样

FFT我用过，测试音频信号。有兴趣一起讨论下。

Fi_Sun 发表于 2014-8-24 04:14:21

RE:【stm32F429开发日志】+DMA_ADC+2048FFT+TIM采样

大哥真的是乱码，能否再贡献一份谢谢

syzby 发表于 2014-10-30 19:36:03

请教:FFT函数如何使用?

小飞0001 发表于 2014-11-1 21:03:42

支持，学习下

sjh943498450 发表于 2014-12-10 11:00:26

不知道楼主能否交流下具体的思路

ryou 发表于 2015-1-15 13:31:15

泉水叮咚发表于 2014-7-26 19:40
FFT我用过，测试音频信号。有兴趣一起讨论下。

你好, 有QQ吗, 我也想弄个显示音频频谱的, 做了FFT, 但好像结果不太对

JACK847070222 发表于 2015-1-17 22:54:03

德华，是我认识的吗

lkl0305 发表于 2015-1-18 12:06:19

学习下:)

麟狮蕟 发表于 2015-2-2 05:49:00

看看看。。

水晶墨尔本 发表于 2015-5-12 12:40:45

水晶墨尔本 发表于 2015-5-12 13:57:01

楼主你好，这个乱码，能否再上传一份

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