TM4C123GH6PM的ADC数据用uDMA乒乓模式传输不成功，请帮忙看看哪里配置错误，谢谢！

Qing Hu

我的问题中定时器触发ADC转换，转换完后用uDMA将数据搬至缓存区。用乒乓模式，配置了主/副控制结构体。定时器触发是成功的，单独配置下能使ADC正确转换。主要是uDMA搬移数据只能进一次ADC外设中断，即只能搬一次数据。进中断时主/副控制结构体同时会判断传输结束，而不是手册上的无限循环：

程序代码：

//*************************************************程序变量设置*****************************************************

#define ADC0_BUF_SIZE 1024

uint32_t Adc0_Val_RA[ADC0_BUF_SIZE];
uint32_t Adc0_Val_RB[ADC0_BUF_SIZE];

//*************************************************uDMA初始化*****************************************************

uint8_t ucDMAControlTable[1024];//通道控制表
extern uint32_t Adc0_Val_RA[ADC0_BUF_SIZE];
extern uint32_t Adc0_Val_RB[ADC0_BUF_SIZE];

void MyDma_Init(void)
{
SysCtlPeripheralEnable(SYSCTL_PERIPH_UDMA);
uDMAEnable();
uDMAControlBaseSet(ucDMAControlTable);
//-------------------------
uDMAChannelAttributeDisable(UDMA_CHANNEL_ADC0, UDMA_ATTR_ALL);//失能通道的所有特性
uDMAChannelAttributeEnable(UDMA_CHANNEL_ADC0,UDMA_ATTR_USEBURST|UDMA_ATTR_HIGH_PRIORITY);//使能猝发与高优先级
//-------------------------
uDMAChannelControlSet(UDMA_CHANNEL_ADC0 | UDMA_PRI_SELECT,
        UDMA_SIZE_32 | UDMA_SRC_INC_NONE |UDMA_DST_INC_32 | UDMA_ARB_8);
uDMAChannelControlSet(UDMA_CHANNEL_ADC0 | UDMA_ALT_SELECT,
        UDMA_SIZE_32 | UDMA_SRC_INC_NONE |UDMA_DST_INC_32 | UDMA_ARB_8);
//-------------------------
uDMAChannelTransferSet(UDMA_CHANNEL_ADC0| UDMA_PRI_SELECT,
        UDMA_MODE_PINGPONG, (void *)(ADC0_BASE+ADC_O_SSFIFO0), Adc0_Val_RA,ADC0_BUF_SIZE);
uDMAChannelTransferSet(UDMA_CHANNEL_ADC0| UDMA_ALT_SELECT,
        UDMA_MODE_PINGPONG, (void *)(ADC0_BASE+ADC_O_SSFIFO0), Adc0_Val_RB,ADC0_BUF_SIZE);

uDMAChannelEnable(UDMA_CHANNEL_ADC0);
}

//***********************************************ADC初始化与中断***************************************************

void Adc0_Init(void)
{
SysCtlPeripheralEnable(SYSCTL_PERIPH_ADC0);
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOE);
GPIOPinTypeADC(GPIO_PORTE_BASE, GPIO_PIN_3);
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ADCSequenceConfigure(ADC0_BASE,0,ADC_TRIGGER_TIMER, 0);//定时器触发ADC转换

ADCSequenceStepConfigure(ADC0_BASE, 0, 0, ADC_CTL_CH0);
ADCSequenceStepConfigure(ADC0_BASE, 0, 1, ADC_CTL_CH0);
ADCSequenceStepConfigure(ADC0_BASE, 0, 2, ADC_CTL_CH0);
ADCSequenceStepConfigure(ADC0_BASE, 0, 3, ADC_CTL_CH0);
ADCSequenceStepConfigure(ADC0_BASE, 0, 4, ADC_CTL_CH0);
ADCSequenceStepConfigure(ADC0_BASE, 0, 5, ADC_CTL_CH0);
ADCSequenceStepConfigure(ADC0_BASE, 0, 6, ADC_CTL_CH0);
ADCSequenceStepConfigure(ADC0_BASE, 0, 7, ADC_CTL_CH0|ADC_CTL_END|ADC_CTL_IE);//使得uDMA仲裁大小为8
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ADCSequenceDMAEnable(ADC0_BASE, 0);//使能DMA传输
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ADCIntRegister(ADC0_BASE,0,ADC0IntHandler);
ADCIntEnable(ADC0_BASE, 0);
ADCIntEnableEx(ADC0_BASE,ADC_INT_DMA_SS0);//代表DMA触发
// IntEnable(INT_ADC0SS0);
// ADCIntClear(ADC0_BASE, ui32SequenceNum);
ADCSequenceEnable(ADC0_BASE, 0);

//****************************
extern uint32_t Adc0_Val_RA[ADC0_BUF_SIZE];
extern uint32_t Adc0_Val_RB[ADC0_BUF_SIZE];
void ADC0IntHandler(void)
{
   ADCIntClearEx(ADC0_BASE, ADC_INT_DMA_SS0);

if(uDMAChannelModeGet(UDMA_CHANNEL_ADC0| UDMA_PRI_SELECT) == UDMA_MODE_STOP)
   {
  uDMAChannelTransferSet(UDMA_CHANNEL_ADC0| UDMA_PRI_SELECT,
        UDMA_MODE_PINGPONG, (void *)(ADC0_BASE+ADC_O_SSFIFO0), Adc0_Val_RA,ADC0_BUF_SIZE);
   }

if(uDMAChannelModeGet(UDMA_CHANNEL_ADC0| UDMA_ALT_SELECT) == UDMA_MODE_STOP)
   {
  uDMAChannelTransferSet(UDMA_CHANNEL_ADC0| UDMA_ALT_SELECT,
        UDMA_MODE_PINGPONG, (void *)(ADC0_BASE+ADC_O_SSFIFO0), Adc0_Val_RB,ADC0_BUF_SIZE);
   }
}

//*********************************************************main.c**************************************************************

int main(void)
{
//~~~~~~~~~~~~~~~~~~~
SysCtlClockSet(SYSCTL_SYSDIV_2_5|SYSCTL_USE_PLL|SYSCTL_OSC_MAIN|SYSCTL_XTAL_16MHZ);
//~~~~~~~~~~~~~~~~~~~
Adc0_Init(0);
MyDma_Init();
My_Timer_Trigger_Init();//定时器触发ADC转换
IntMasterEnable();
while(1)
{
}
}

9 年多前

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TM4C123GH6PM的ADC数据用uDMA乒乓模式传输不成功，请帮忙看看哪里配置错误，谢谢！