CH32V003使用ADC八通道转换注意事项

https://www.cnblogs.com/wchmcu/p/17535947.html

文章来源：https://www.cnblogs.com/wchmcu/p/17535947.html
本文以CH32V003_F4P6(20Pin)为模板
1、PA1、PA2为外部晶振输入引脚，同时也是ADC的CH1与CH0，所以需要先在system_ch32v00x.c文件中更改为内部48M的宏即可。
注：CH32V003的ADC数据寄存器为10，通道转换值为[0-1024],精度为VCC/1024,VCC与外部参考电压相同[2.8-5.5]

2、ADC初始化与通道配置。

void ADC_Function_Init(void)
{
ADC_InitTypeDef ADC_InitStructure = {0};
GPIO_InitTypeDef GPIO_InitStructure = {0};
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA |RCC_APB2Periph_GPIOC |RCC_APB2Periph_GPIOD, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
RCC_ADCCLKConfig(RCC_PCLK2_Div8);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1|GPIO_Pin_2;//ch0 ch1
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;//ch2
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOC, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2|GPIO_Pin_3 | GPIO_Pin_5 |GPIO_Pin_6|GPIO_Pin_4;//ch3 ch4 ch5 ch6 ch7
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
GPIO_Init(GPIOD, &GPIO_InitStructure);
ADC_DeInit(ADC1);
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_InitStructure.ADC_ScanConvMode = ENABLE;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfChannel = 8;//此处为8个待转换的ADC规则组通道
ADC_Init(ADC1, &ADC_InitStructure);
ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_241Cycles);
ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 2, ADC_SampleTime_241Cycles);
ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 3, ADC_SampleTime_241Cycles);
ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 4, ADC_SampleTime_241Cycles);
ADC_RegularChannelConfig(ADC1, ADC_Channel_4, 5, ADC_SampleTime_241Cycles);
ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 6, ADC_SampleTime_241Cycles);
ADC_RegularChannelConfig(ADC1, ADC_Channel_6, 7, ADC_SampleTime_241Cycles);
ADC_RegularChannelConfig(ADC1, ADC_Channel_7, 8, ADC_SampleTime_241Cycles);
ADC_DMACmd(ADC1, ENABLE);
ADC_Cmd(ADC1, ENABLE);
ADC_ResetCalibration(ADC1);
while(ADC_GetResetCalibrationStatus(ADC1));
ADC_StartCalibration(ADC1);
while(ADC_GetCalibrationStatus(ADC1));
}

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3、DMA配置

void DMA_Tx_Init(DMA_Channel_TypeDef *DMA_CHx, u32 ppadr, u32 memadr, u16 bufsize)
{
DMA_InitTypeDef DMA_InitStructure = {0};
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
DMA_DeInit(DMA_CHx);
DMA_InitStructure.DMA_PeripheralBaseAddr = ppadr;
DMA_InitStructure.DMA_MemoryBaseAddr = memadr;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = bufsize;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;//单次扫描转换，可以开启DMA中断，此处改为循环模式
DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA_CHx, &DMA_InitStructure);
}