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大佬們，幫忙看看：STM32f070的芯片，ADC換了專用的14MHz時鐘源后，它的寄存器在配置時就寫不了了，這是什么原因呀？
程序如下：
#include "main.h"
uint32_t Buffer_adc[3];
uint32_t ISENA;
uint32_t ISENB;
uint32_t DC_ADC;
int main(void)
{
GPIO_InitTypeDef GPIO_InitStructure ;
ADC_InitTypeDef ADC_InitStructure ;
DMA_InitTypeDef DMA_InitStructure ;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA,ENABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE);
ADC_ClockModeConfig(ADC1,ADC_ClockMode_AsynClk); //ADC專用14MHz時鐘
// RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1,ENABLE);
RCC_HSI14Cmd(ENABLE);
RCC_HSI14ADCRequestCmd(ENABLE);
// RCC_ADCCLKConfig(RCC_ADCCLK_HSI14);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN ;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1|GPIO_Pin_3|GPIO_Pin_5 ;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
GPIO_Init(GPIOA,&GPIO_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = ADC1_IRQn ;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE ;
NVIC_InitStructure.NVIC_IRQChannelPriority = 0 ;
NVIC_Init(&NVIC_InitStructure);
ADC_DeInit(ADC1);
ADC_StructInit(&ADC_InitStructure);
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE ;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right ;
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None ;
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b ;
ADC_InitStructure.ADC_ScanDirection = ADC_ScanDirection_Upward ;
ADC_Init(ADC1,&ADC_InitStructure);
ADC1->CFGR1 |= (1<<13);
// ADC_ClockModeConfig(ADC1,ADC_ClockMode_SynClkDiv4);
ADC_ChannelConfig(ADC1,ADC_Channel_1|ADC_Channel_3|ADC_Channel_5,ADC_SampleTime_55_5Cycles);//選擇ADC通道和采樣時間
ADC_GetCalibrationFactor(ADC1);//開始校準
// ADC_ClockModeConfig(ADC1,ADC_ClockMode_AsynClk); //ADC專用14MHz時鐘
ADC_AutoPowerOffCmd(ADC1,DISABLE); //失能低功耗自關斷模式
DMA_DeInit(DMA1_Channel1);
DMA_InitStructure.DMA_BufferSize = 3 ;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC ;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable ;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)Buffer_adc ;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word ;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable ;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular ;
DMA_InitStructure.DMA_PeripheralBaseAddr = 0x40012440 ;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word ;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable ;
DMA_InitStructure.DMA_Priority = DMA_Priority_High ;
DMA_Init(DMA1_Channel1,&DMA_InitStructure) ;
// ADC_ITConfig(ADC1,ADC_IT_ADRDY,ENABLE);
// ADC_ITConfig(ADC1,ADC_IT_EOSMP,ENABLE);
// ADC_ITConfig(ADC1,ADC_IT_EOC,ENABLE);
ADC_DMARequestModeConfig(ADC1, ADC_DMAMode_Circular);//循環轉換模式
ADC_DMACmd(ADC1,ENABLE);//使能ADC的DMA請求
ADC_Cmd(ADC1,ENABLE);//打開ADC
while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_ADRDY)); //ADC轉換準備完成
ADC_StartOfConversion(ADC1);//軟件控制ADC開始轉換
DMA_Cmd(DMA1_Channel1, ENABLE);//打開DMA通道
while(1)
{
while((DMA_GetFlagStatus(DMA1_FLAG_TC1)) == RESET ); //當產生傳輸完成的事件時
ISENA = Buffer_adc[0]*3300/0xfff ;
ISENB = Buffer_adc[1]*3300/0xfff ;
DC_ADC = Buffer_adc[2]*3300/0xfff ;
DMA_ClearFlag(DMA1_FLAG_TC1); //清除DMA通道1傳輸完成標志TCIFx，由硬件設置，軟件清零
}
}
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時鐘樹
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ADC寄存器
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RCC寄存器
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時鐘控制寄存器RCC_CR2
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，終于解決了，太感謝你了，大佬！
