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使用场景
在需要多次采样结果的情况下，比如1s需要10w次的采样结果，可以考虑使用定时器触发采样，定时器设置多少的时间就会多久采样转换一次。
再加上使用dma，采样的结果直接放在dma的数组里面。
实现了自动采样，自动保存，使用非常方便。
需要用到CTU模块
代码如下
代码不是很完整 可以参考sample里面adc的定时器触发代码
/*********<Variable>********/
uint8_t g_dmaFinish = 0;//DMA传输完成
uint8_t g_halfDmaFinish = 0; //DMA传输半完成
uint8_t g_dmaTransError = 0; //DMA传输错误
uint32_t g_ADCValueBuffer[DMA_TRANSFER_NUM + 1] = {0};
uint32_t g_timerCnt = 0;
uint32_t g_averageSampleValue = 0;#define Delay50us (APB_BUS_FREQ/2000-1)
#define Delay5ms (APB_BUS_FREQ/200-1)
#define Delay1s (APB_BUS_FREQ-1)
#define DMA_TRANSFER_NUM 100void ADC_DMACallback(void *device, uint32_t wpara, uint32_t lpara)
{/*wparam为DMA通道状态，状态含义可参考CHANNELx_STATUS寄存器，CHANNELx_STATUS[2] 传输错误CHANNELx_STATUS[1] 半传输完成（相对设置的transferNum，如果半传输中断有使能，transferNum设为6，则DATA_TRANS_NUM为3时产生中断，进入回调）CHANNELx_STATUS[0] 传输完成*/if ((wpara & 0x01) == 0x1){g_dmaFinish = 1;}if ((wpara & 0x02) == 0x2){g_halfDmaFinish = 1;}if ((wpara & 0x04) == 0x4){g_dmaTransError = 1;}
}void ADC_DMAInit(void)
{uint32_t tmpMemStartAddr = (uint32_t)&g_ADCValueBuffer[0];uint32_t tmpMemEndAddr = (uint32_t)&g_ADCValueBuffer[DMA_TRANSFER_NUM + 1]; ///<Setting memory DMA addressDMA_ConfigType tmpDMAConfig;memset(&tmpDMAConfig, 0x00, sizeof(DMA_ConfigType));tmpDMAConfig.memStartAddr = tmpMemStartAddr; //设置DMA开始地址tmpDMAConfig.memEndAddr = tmpMemEndAddr;//设置DMA结束地址tmpDMAConfig.periphStartAddr = (uint32_t)(&(ADC0->RDR)); ///<Move ADC DR to memorytmpDMAConfig.channelEn = ENABLE; ///<使能DMAx通道tmpDMAConfig.finishInterruptEn = ENABLE; ///<使能DMA传输完成中断tmpDMAConfig.halfFinishInterruptEn = DISABLE; ///<去能DMA半传输完成中断tmpDMAConfig.errorInterruptEn = ENABLE; ///<使能DMA传输错误中断tmpDMAConfig.channelPriority = DMA_PRIORITY_VERY_HIGH;///<设置DMA通道优先级，0~3 ：优先级由低到高tmpDMAConfig.circular = ENABLE; ///<使能循环模式，如果只想工作一次，设为0即可。tmpDMAConfig.direction = DMA_READ_FROM_PERIPH; ///<0: 从外设读取，1：从存储器读取tmpDMAConfig.MEM2MEM = DISABLE; ///<0：在非存储器与存储器之间传输，1：在存储器与存储器之间传输tmpDMAConfig.memByteMode = DMA_MEM_BYTE_MODE_1TIME; ///<MEM字分割传输数，0:32-bit,1:16-bit[15:0]; 2:16-bit[23:16][7:0];3:8-bit。详情可参考AC781X芯片手册 表20-2 可编程数据宽度&数据对齐 tmpDMAConfig.memIncrement = ENABLE; ///<1:MEM地址增加tmpDMAConfig.periphIncrement = DISABLE; ///<0：外设地址固定tmpDMAConfig.memSize = DMA_MEM_SIZE_32BIT; ///<0:8-bit,1:16-bit,2:32-bittmpDMAConfig.periphSize = DMA_PERIPH_SIZE_16BIT; ///<0:8-bit,1:16-bit,2:32-bittmpDMAConfig.transferNum = DMA_TRANSFER_NUM; ///<DMA通道传输长度tmpDMAConfig.periphSelect = DMA_PEPIRH_ADC0; //外设选择tmpDMAConfig.callBack = ADC_DMACallback; ///<设置DMA中断回调DMA_Init(DMA0_CHANNEL0, &tmpDMAConfig); ///<ADC 使用DMA1通道，每个模块对应的DMA通道，可参考 AC781X芯片手册 表20-1 DMA请求列表NVIC_EnableIRQ(DMA0_CHANNEL0_IRQn); ///<使能DMA1中断请求
}
/*** CTU_Config** @param[in] void* @return void** @brief 配置CTU模块，Timer0触发ADC规则组采样。*/
void CTU_Config(void)
{CTU_ConfigType ctuConfig;memset(&ctuConfig, 0x00, sizeof(ctuConfig));ctuConfig.uart0RxFilterEn = DISABLE; //去能UART0_RX滤波ctuConfig.rtcCaptureEn = DISABLE; //去能RTC捕获ctuConfig.acmpCaptureEn = DISABLE; //去能ACMP捕获ctuConfig.uart0RxCaptureEn = DISABLE; //去能UART0_RX捕获ctuConfig.uartTxModulateEn = DISABLE; //去能UART0_TX调制ctuConfig.clkPsc = CTU_CLK_PRESCALER_1; //分频ctuConfig.adcRegularTriggerSource = CTU_TRIGGER_ADC_TIMER_CH0_OVERFLOW; //Timer0触发ADC规则组采样。ctuConfig.delay0Time = 0; //触发延迟CTU_Init(&ctuConfig);
}void TIMER_Callback(void *device, uint32_t wpara, uint32_t lpara)
{if (TIMER_CHANNEL0 == device){g_timerCnt++;}
}void TIMER0_Init(void)
{TIMER_ConfigType timerConfig = {0};timerConfig.periodValue = Delay50us;//5ms定时timerConfig.interruptEn = ENABLE;//使能中断timerConfig.linkModeEn = DISABLE;//级联模式去能timerConfig.callBack = TIMER_Callback;//设置中断回调函数timerConfig.timerEn = ENABLE;//使能定时器TIMER_Init(TIMER_CHANNEL0, &timerConfig);
}void ADC_init()
{ADC_ConfigType tempAdcConfig;ADC_ConfigType* adcConfig;adcConfig = &tempAdcConfig;//配置PINMUXGPIO_SetFunc(GPIOA, GPIO_PIN2, GPIO_FUN2);///<ADC_IN8 Analog function enableGPIO_SetFunc(GPIOA, GPIO_PIN8, GPIO_FUN2);///<ADC_IN8 Analog function enableadcConfig->clkPsc = ADC_CLK_PRESCALER_1; ///<Set ADC Clk = 24M/2/(0+1)adcConfig->scanModeEn = ENABLE; //扫描模式adcConfig->continousModeEn = DISABLE; //连续模式adcConfig->regularDiscontinousModeEn = DISABLE; //1：打开规则组间断转换模式adcConfig->injectDiscontinousModeEn = DISABLE; //1：打开注入组间断转换模式adcConfig->injectAutoModeEn = DISABLE; //1：自动注入模式adcConfig->intervalModeEn = DISABLE; //1：注入组为间隔转换模式adcConfig->regularDiscontinousNum = 0; //adcConfig->EOCInterruptEn = DISABLE; //EOC中断去能adcConfig->IEOCInterruptEn = DISABLE; //IEOC中断去能adcConfig->interruptEn = DISABLE; //去能中断adcConfig->regularDMAEn = ENABLE; //使能ADC DMAadcConfig->regularTriggerMode = ADC_TRIGGER_EXTERNAL;//ADC触发源，外部触发adcConfig->injectTriggerMode = ADC_TRIGGER_INTERNAL; //ADC触发源，内部触发adcConfig->regularSequenceLength = 2; //规则组长度设为1adcConfig->injectSequenceLength = 0; //注入组长度设为0adcConfig->dataAlign = ADC_DATA_ALIGN_RIGHT; //右对齐adcConfig->powerMode = ADC_POWER_ON; //上电ADC_Init(ADC0, adcConfig); ///<ADC works Mode Config/*ADC转换率计算公式：转换时间= 采样时间+转换时间+同步时间转换时间= (SPT+12)/ADC模块时钟频率+5/APB时钟频率备注：1.同步时间为5个APB CLK。2.ADC时钟频率 = APB时钟频率 /(分频系数+1)*///ADC_SetRegularGroupChannel(ADC0, ADC_CH_8, ADC_SPT_CLK_7, 0); //采样&转换时间= (7+12)/24000000 + 5/24000000 = 1usADC_SetRegularGroupChannel(ADC0, ADC_CH_8, ADC_SPT_CLK_64, 0); //采样&转换时间= (7+12)/24000000 + 5/24000000 = 1usADC_SetRegularGroupChannel(ADC0, ADC_CH_3, ADC_SPT_CLK_64, 1); //采样&转换时间= (7+12)/24000000 + 5/24000000 = 1usADC_DMAInit(); //ADC DMA初始化
}void sampleValueDeal(void)
{int i;uint32_t sumValue = 0;for (i = 0; i < DMA_TRANSFER_NUM; i++){sumValue += g_ADCValueBuffer[i];}g_averageSampleValue = sumValue / DMA_TRANSFER_NUM;}void ADC_SampleTimerTrigerRegular(void)
{CTU_Config();ADC_init();TIMER0_Init();///<开始ADC规则组转换，转换值根据规则组通道顺序存储在g_ADCValueBuffer数组中。while(1){//nothing todo mdelay(500);sampleValueDeal();printf("Timer Triger ADC Regular Sample value: %d\r\n", g_averageSampleValue);}
}/**********<End>*********/
采样频率用这个时间来控制
需要用到CTU模块来连接定时器和ADC'
需要多个ADC通道在这里添加，注意修改规则组长度
DMA的配置用示例的就行
配置了2个通道的时候，采样的结果会按照顺序存储在DMA数组里面
