大神們求解決
void DMA_init(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); //使能DMA傳輸
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 ) ); //傳輸的源頭地址
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&adcbuff; //目標地址
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; //外設作源頭
DMA_InitStructure.DMA_BufferSize = N; //數據長度為256個
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//外設地址寄存器不遞增
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//內存地址遞增
DMA_InitStructure.DMA_PeripheralDataSize = DMA_MemoryDataSize_HalfWord;//外設傳輸以2字節為單位
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;//內存以2字節為單位
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;//循環模式
DMA_InitStructure.DMA_Priority =DMA_Priority_Medium;//中級優先級
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; //非內存到內存
DMA_Init(DMA1_Channel1, &DMA_InitStructure);//根據以上參數初始化DMA_InitStructure
//DMA_ClearFlag(DMA1_FLAG_TC1); //清除DMA數據流傳輸完成標志位
DMA_ITConfig(DMA1_Channel1, DMA_IT_TC, ENABLE);//配置DMA1通道1傳輸完成中斷
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通道時鐘
RCC_ADCCLKConfig(RCC_PCLK2_Div6); //設置ADC分頻因子6 72M/6=12,ADC最大時間不能超過14M
//PA0 作為模擬通道輸入引腳
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; //模擬輸入引腳
GPIO_Init(GPIOA, &GPIO_InitStructure);
ADC_DeInit(ADC1); //復位ADC1
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent; //ADC工作模式:ADC1在獨立模式
ADC_InitStructure.ADC_ScanConvMode = DISABLE; //模數轉換工作在單通道模式
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE; //模數轉換工作在單次轉換模式
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T3_TRGO; //選擇定時器 3 的 TRGO 作為轉換外部觸發
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //ADC數據右對齊
ADC_InitStructure.ADC_NbrOfChannel = 1; //順序進行規則轉換的ADC通道的數目
ADC_Init(ADC1, &ADC_InitStructure); //根據ADC_InitStruct中指定的參數初始化外設ADCx的寄存器
ADC_Cmd(ADC1, ENABLE); //使能指定的ADC1
ADC_ResetCalibration(ADC1); //使能復位校準
while(ADC_GetResetCalibrationStatus(ADC1)); //等待復位校準結束
ADC_StartCalibration(ADC1); //開啟AD校準
while(ADC_GetCalibrationStatus(ADC1)) ; //等待校準結束
ADC_DMACmd(ADC1, ENABLE);//開啟ADC的DMA支持
// ADC_SoftwareStartConvCmd(ADC1, ENABLE); //使能指定的ADC1的軟件轉換啟動功能
ADC_ExternalTrigConvCmd(ADC1,ENABLE);//使能外部觸發
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; //設置在下一個更新事件裝入活動的自動重裝載寄存器周期的值
TIM_TimeBaseStructure.TIM_Prescaler =71; //設置用來作為TIMx時鐘頻率除數的預分頻值
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //設置時鐘分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上計數模式
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
TIM_SetAutoreload(TIM3, 99);
TIM_SelectOutputTrigger(TIM3, TIM_TRGOSource_Update);//選擇 TIM3 觸發輸出模式使用更新事件作為觸發輸出（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傳輸完成標志
int main(void)
{
int num=0;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //設置NVIC中斷分組2:2位搶占優先級，2位響應優先級
Adc_Init(); //ADC1初始化
uart_init(115200); //串口USART1初始化
DMA_init(); //dma1初始化
TIM3_Init(); //定時器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;
}
}
}
這哪里錯了啊，大神們
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