一配置PB0 做为ADC的PA0就读不出值？

只看该作者 · 2012-4-2 16:13

一配置PB0 做为ADC的PA0就读不出值？不配PB时读出值正常。

只看该作者 · 2012-4-2 16:15

代码呢

只看该作者 · 2012-4-2 16:22

初始化PB0:
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB,&GPIO_InitStructure);
初始化ADC PA0:
void ADC_Configuration(void)
{
  ADC_InitTypeDef ADC_InitStructure;
  DMA_InitTypeDef DMA_InitStructure;
  GPIO_InitTypeDef GPIO_InitStructure;

  // 配置PA0/ADC12_IN0为模拟输入
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  // 配置 DMA 通道1
  DMA_DeInit(DMA1_Channel1);
  DMA_InitStructure.DMA_PeripheralBaseAddr = 0x4001244C; // 地址
  DMA_InitStructure.DMA_MemoryBaseAddr = (u32)&ADC_Info.ConvertedValue; // ADC转换值存贮地址
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
  DMA_InitStructure.DMA_BufferSize = 1;
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
  DMA_InitStructure.DMA_Priority = DMA_Priority_High;
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
  DMA_Init(DMA1_Channel1, &DMA_InitStructure);

  /* Enable DMA1 channel1 */
  DMA_Cmd(DMA1_Channel1, ENABLE);

  /* ADC1 configuration ------------------------------------------------------*/
  ADC_InitStructure.ADC_Mode = ADC_Mode_Independent; // ADC1/ADC2工作在独立模式下
  ADC_InitStructure.ADC_ScanConvMode = ENABLE; // 启动扫描模式
  ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; // 连续工作模式
  ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None; // 软件启动而非外部触发
  ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; // 数据右对齐
  ADC_InitStructure.ADC_NbrOfChannel = 1; // ADC通道数目
  ADC_Init(ADC1, &ADC_InitStructure);

  /* ADC1 regular channel6 configuration */
  ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 1, ADC_SampleTime_239Cycles5); //ADC通道选择及采样周期设置

  /* Enable ADC1 DMA */
  ADC_DMACmd(ADC1, ENABLE);

  /* Enable ADC1 */
  ADC_Cmd(ADC1, ENABLE);

  /* Enable ADC1 reset calibaration register */
  ADC_ResetCalibration(ADC1);
  /* Check the end of ADC1 reset calibration register */
  while(ADC_GetResetCalibrationStatus(ADC1));

  /* Start ADC1 calibaration */
  ADC_StartCalibration(ADC1);
  /* Check the end of ADC1 calibration */
  while(ADC_GetCalibrationStatus(ADC1));

  /* Start ADC1 Software Conversion */
  ADC_SoftwareStartConvCmd(ADC1, ENABLE);
}
看值：ADC_Info.ConvertedValue

只看该作者 · 2012-4-2 16:23

先初始化PA0 读ADC_Info.ConvertedValue正常，但一配置PB0/PB1则ADC_Info.ConvertedValue自动变成0

只看该作者 · 2012-4-2 16:27

能把main函数贴出来看看吗

只看该作者 · 2012-4-2 16:31

int main(void)
{
  /*!< At this stage the microcontroller clock setting is already configured,
   this is done through SystemInit() function which is called from startup
   file (startup_stm32f10x_xx.s) before to branch to application main.
   To reconfigure the default setting of SystemInit() function, refer to
   system_stm32f10x.c file
   */

  /* Add your application code here    */

// 端口定义及初始化
RCC_Configuration();

ADC_Configuration();
            GPIO_Configuration();

}
就这几步就不对
void RCC_Configuration(void)
{
  /* RCC system reset(for debug purpose) */
  RCC_DeInit();

  /* Enable HSE */
  RCC_HSEConfig(RCC_HSE_ON);

  /* Wait till HSE is ready */
  if(RCC_WaitForHSEStartUp() == SUCCESS)
  {
/* Enable Prefetch Buffer */
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);

/* Flash 2 wait state */
FLASH_SetLatency(FLASH_Latency_2);

/* HCLK = SYSCLK */
RCC_HCLKConfig(RCC_SYSCLK_Div1);

/* PCLK2 = HCLK */
RCC_PCLK2Config(RCC_HCLK_Div1);

/* PCLK1 = HCLK/2 */
RCC_PCLK1Config(RCC_HCLK_Div2);

/* PLLCLK = 8MHz * 9 = 72 MHz */
RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);

/* Enable PLL */
RCC_PLLCmd(ENABLE);

/* Wait till PLL is ready */
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)
{
}

/* Select PLL as system clock source */
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);

/* Wait till PLL is used as system clock source */
while(RCC_GetSYSCLKSource() != 0x08)
{
}
  }

  /* Enable GPIOC clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
   RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC
                        | RCC_APB2Periph_TIM1
                        | RCC_APB2Periph_ADC1
                        | RCC_APB2Periph_AFIO
                        , ENABLE);
}

只看该作者 · 2012-4-2 16:36

RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC
                        | RCC_APB2Periph_TIM1
                        | RCC_APB2Periph_ADC1
                        | RCC_APB2Periph_AFIO
                        , ENABLE);

把上面的那段改成下面的这个试试。

RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA | RCC_APB2Periph_ADC1| RCC_APB2Periph_AFIO, ENABLE);

RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOB, ENABLE);