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本人菜鸟!!
想用STM32做频谱显示,但是第一步就出了问题,DMA、ADC、TIM初始化之后,但是没有数据返回,不知道是哪里的配置出了问题!!!
(百度了好久,按照配置弄了好久,都没结果)
还请大神们指点
这是配置的源码
#define NPT 1024 // 定义ADC数据缓冲数组最大长度,FFT采样点数 1024 点
#define NDTR NPT //数据传输量 1024 点
u32 l_BufInArray[NPT];
void ADC1_DMA2_Init(u32 arr, u32 psc)
{
ADC_InitTypeDef ADC_InitStructure;
ADC_CommonInitTypeDef ADC_CommonInitStructure;
DMA_InitTypeDef DMA_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
//初始化模拟输入IO
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE); //使能GPIOC时钟
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1; //PC1 通道11
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN; //模拟输入
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ; //不带上下拉
GPIO_Init(GPIOC, &GPIO_InitStructure); //初始化
//初始化DMA
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE); //DMA2时钟使能
DMA_DeInit(DMA2_Stream0); //DMA2 通道0配置
DMA_InitStructure.DMA_Channel = DMA_Channel_0; //通道选择
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)(ADC1->DR); //DMA外设基地址
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)l_BufInArray; //DMA 存储器内存基地址
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory; //传输方向为外设到存储器模式
DMA_InitStructure.DMA_BufferSize = NDTR; //数据传输量 传输时缓冲区长度
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设非增量模式
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //存储器增量模式
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; //外设数据长度:16位
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word; //存储器数据长度:32位
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; //DMA传输模式:正常
DMA_InitStructure.DMA_Priority = DMA_Priority_High; //中等优先级:高优先级
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable; //禁止FIFO
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single; //存储器突发单次传输
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; //外设突发单次传输
DMA_Init(DMA_ADC1_Stream, &DMA_InitStructure); //初始化DMA Stream0
DMA_Cmd(DMA2_Stream0, ENABLE); //使能DMA2通道0
ADC_DMACmd(ADC1, ENABLE);
//初始化ADC1
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE); //使能ADC1时钟
RCC_APB2PeriphResetCmd(RCC_APB2Periph_ADC1,ENABLE); //ADC1复位
RCC_APB2PeriphResetCmd(RCC_APB2Periph_ADC1,DISABLE); //复位结束
ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent; //独立模式
ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;//两个采样阶段之间的延迟5个时钟
ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_2;
ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2; //预分频2分频
ADC_CommonInit(&ADC_CommonInitStructure); //初始化
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b; //12位模式
ADC_InitStructure.ADC_ScanConvMode = DISABLE; //非扫描模式
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE; //关闭连续转换
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_Rising; //上升沿触发
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //右对齐
ADC_InitStructure.ADC_NbrOfConversion = 1; //1个转换在规则序列中 也就是只转换规则序列1
ADC_Init(ADC1, &ADC_InitStructure); //ADC初始化
ADC_RegularChannelConfig(ADC1, EARPHONE, 1, ADC_SampleTime_3Cycles);//规则通道的配置
ADC_Cmd(ADC1, ENABLE); //使能ADC1
//初始化TIM
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
TIM_TimeBaseStructure.TIM_Prescaler = psc;
TIM_TimeBaseStructure.TIM_Period = arr;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
TIM_OCInitStructure.TIM_Pulse = 0x7f;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
TIM_ARRPreloadConfig(TIM1, ENABLE);
TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable); //使能TIM2在CCR1上的预装载寄存器
TIM_CtrlPWMOutputs(TIM1, ENABLE);
TIM_Cmd(TIM1, ENABLE);
}
int mian(void)
{
delay_init(168); //初始化延时函数
uart_init(115200); //初始化串口波特率为115200
ADC1_DMA2_Init(40-1, 84-1);
while(1)
{
if(DMA_GetFlagStatus(DMA2_Stream0,DMA_FLAG_TCIF0) != RESET)
{
for(i = 0; i < NPT; i ++)
{
printf("ADC:%-4d=%8x ",i,l_BufInArray[i]);
}
printf("\n");
delay_ms(20);
DMA_Cmd(DMA_ADC1_Stream, DISABLE);
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)l_BufInArray;
DMA_InitStructure.DMA_BufferSize = NDTR;//1;
DMA_Init(DMA_ADC1_Stream, &DMA_InitStructure);
DMA_Cmd(DMA_ADC1_Stream, ENABLE);
DMA_ClearFlag(DMA2_Stream0,DMA_FLAG_TCIF0);
}
}
}
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