大神们求解决
void DMA_init(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); //使能DMA传输
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
DMA_DeInit(DMA1_Channel1);
DMA_InitStructure.DMA_PeripheralBaseAddr =( uint32_t ) ( & ( ADC1->DR ) ); //传输的源头地址
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&adcbuff; //目标地址
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; //外设作源头
DMA_InitStructure.DMA_BufferSize = N; //数据长度为256个
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//外设地址寄存器不递增
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//内存地址递增
DMA_InitStructure.DMA_PeripheralDataSize = DMA_MemoryDataSize_HalfWord;//外设传输以2字节为单位
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;//内存以2字节为单位
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;//循环模式
DMA_InitStructure.DMA_Priority =DMA_Priority_Medium;//中级优先级
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; //非内存到内存
DMA_Init(DMA1_Channel1, &DMA_InitStructure);//根据以上参数初始化DMA_InitStructure
//DMA_ClearFlag(DMA1_FLAG_TC1); //清除DMA数据流传输完成标志位
DMA_ITConfig(DMA1_Channel1, DMA_IT_TC, ENABLE);//配置DMA1通道1传输完成中断
DMA_Cmd(DMA1_Channel1, ENABLE);//使能DMA1通道1
}
void Adc_Init(void)
{
ADC_InitTypeDef ADC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA |RCC_APB2Periph_ADC1 , ENABLE ); //使能ADC1通道时钟
RCC_ADCCLKConfig(RCC_PCLK2_Div6); //设置ADC分频因子6 72M/6=12,ADC最大时间不能超过14M
//PA0 作为模拟通道输入引脚
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; //模拟输入引脚
GPIO_Init(GPIOA, &GPIO_InitStructure);
ADC_DeInit(ADC1); //复位ADC1
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent; //ADC工作模式:ADC1在独立模式
ADC_InitStructure.ADC_ScanConvMode = DISABLE; //模数转换工作在单通道模式
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE; //模数转换工作在单次转换模式
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T3_TRGO; //选择定时器 3 的 TRGO 作为转换外部触发
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //ADC数据右对齐
ADC_InitStructure.ADC_NbrOfChannel = 1; //顺序进行规则转换的ADC通道的数目
ADC_Init(ADC1, &ADC_InitStructure); //根据ADC_InitStruct中指定的参数初始化外设ADCx的寄存器
ADC_Cmd(ADC1, ENABLE); //使能指定的ADC1
ADC_ResetCalibration(ADC1); //使能复位校准
while(ADC_GetResetCalibrationStatus(ADC1)); //等待复位校准结束
ADC_StartCalibration(ADC1); //开启AD校准
while(ADC_GetCalibrationStatus(ADC1)) ; //等待校准结束
ADC_DMACmd(ADC1, ENABLE);//开启ADC的DMA支持
// ADC_SoftwareStartConvCmd(ADC1, ENABLE); //使能指定的ADC1的软件转换启动功能
ADC_ExternalTrigConvCmd(ADC1,ENABLE);//使能外部触发
ADC_RegularChannelConfig(ADC1, ADC_Channel_1,1,ADC_SampleTime_239Cycles5);
}
void TIM3_Init(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
// TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
//TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
TIM_TimeBaseStructure.TIM_Period = 99; //设置在下一个更新事件装入活动的自动重装载寄存器周期的值
TIM_TimeBaseStructure.TIM_Prescaler =71; //设置用来作为TIMx时钟频率除数的预分频值
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //设置时钟分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上计数模式
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
TIM_SetAutoreload(TIM3, 99);
TIM_SelectOutputTrigger(TIM3, TIM_TRGOSource_Update);//选择 TIM3 触发输出模式使用更新事件作为触发输出(TRGO)
TIM_Cmd(TIM3, ENABLE); //使能TIM3
}
void DMA1_Channel1_IRQHandler()
{
if(DMA_GetITStatus(DMA1_IT_TC1)!=RESET)
{
TIM_Cmd(TIM3, DISABLE);
adc_dma_ok=1;
DMA_ClearITPendingBit(DMA1_IT_TC1);
}
}
__IO u16 adcbuff[N]={0};uint8_t adc_dma_ok=0 ; //adc的DMA传输完成标志
int main(void)
{
int num=0;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //设置NVIC中断分组2:2位抢占优先级,2位响应优先级
Adc_Init(); //ADC1初始化
uart_init(115200); //串口USART1初始化
DMA_init(); //dma1初始化
TIM3_Init(); //定时器3初始化
while(1)
{
if(adc_dma_ok==1)
{
for(num=0;num<N;num++)
{
printf ("%d\r\n",adcbuff [num]);
}
TIM_Cmd(TIM3, ENABLE);
adc_dma_ok=0;
}
}
}
这哪里错了啊,大神们
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