功能实现：ADC DMA方式循环采样。
采集周期：（256-192）*16*Tsys = （256-192）*16/62.4M = 16.5us
进中断周期：16.5us*采集数据 = 16.5us
int main()
{uint8_t i;signed short RoughCalib_Value = 0; // ADC粗调偏差值uint32_t temp = 0;uint8_t adcchidx = 0;HSECFG_Capacitance(HSECap_18p);SetSysClock(CLK_SOURCE_HSE_PLL_62_4MHz);/* 配置串口调试 */DebugInit();PRINT("Start @ChipID=%02X\n", R8_CHIP_ID);GPIOA_ResetBits(GPIO_Pin_1);GPIOA_ModeCfg(GPIO_Pin_1, GPIO_ModeOut_PP_5mA);/* DMA单通道采样：选择adc通道0做采样，对应 PA4引脚 */PRINT("\n3.Single channel DMA sampling...\n");GPIOA_ModeCfg(GPIO_Pin_4, GPIO_ModeIN_Floating);ADC_ExtSingleChSampInit(SampleFreq_8_or_4, ADC_PGA_0);ADC_ChannelCfg(0);ADC_ExcutSingleConver();//时间足够时建议再次转换并丢弃首次ADC数据ADC_AutoConverCycle(192); // 采样周期为 (256-192)*16个系统时钟ADC_DMACfg(ENABLE, (uint32_t)&adcBuff[0], (uint32_t)&adcBuff[1], ADC_Mode_LOOP);PFIC_EnableIRQ(ADC_IRQn);ADC_StartAutoDMA();while(1);
}__INTERRUPT
__HIGH_CODE
void ADC_IRQHandler(void) //adc中断服务程序
{GPIOA_InverseBits(GPIO_Pin_1);if(ADC_GetDMAStatus()){R32_ADC_DMA_BEG = ((uint32_t)adcBuff) & 0x1ffff;ADC_ClearDMAFlag();}
}
