问模拟输入引脚PA8、PA11和PA12不工作在STM32F103RB上

EN

    /* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "stdio.h"
#include "stdlib.h"

// Standard STM peripheral config functions
void RCC_Configuration(void);
void GPIO_Configuration(void);

// ADC config - STM example code
void NEW_ADC_Configuration(void);

// Function to read ADC channel and output value
u16 NEW_readADC1(u8 channel);


// Variables
double voltage_su;          // Variable to store supply voltage
double voltage7;
double voltage8;

//*****************************************************************************
// Main program
int main(void)
{
    // Initialise peripheral modules
    RCC_Configuration();
    GPIO_Configuration();
    NEW_ADC_Configuration();

    // Infinate loop
    while (1)
    {       

        // Get value of supply voltage and convert
        voltage_su =  (((3.3 * NEW_readADC1(ADC_Channel_12)) / 4095));

    }
}
//*****************************************************************************
// STM RCC config
void RCC_Configuration(void)
{
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);   // Connect PORTC
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);   // Connect PORTB...
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);   // Connect PORTA...
}
//*****************************************************************************
// STM GPIO config
void GPIO_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;    // Value for setting up the pins

    // Sup
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);  

}
//*****************************************************************************
void NEW_ADC_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    ADC_InitTypeDef ADC_InitStructure;  // Varibale used to setup the ADC
    RCC_ADCCLKConfig(RCC_PCLK2_Div4);   // Set ADC clock to /4

    // Enable ADC 1 so we can use it
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
    // Conenct the port A to peripheral clock
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
    // Restore to defaults
    ADC_DeInit(ADC1);

    /* ADC1 Configuration ----------------------------------------------------*/
    ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
    // Scan 1 at a time
    ADC_InitStructure.ADC_ScanConvMode = DISABLE;
    // No continuous conversions - do them on demand
    ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
    // Start conversion on software request - not bu external trigger
    ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
    // Conversions are 12 bit - put them in the lower 12 bits of the result 
    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
    // How many channels are to be sued by the sequencer
    ADC_InitStructure.ADC_NbrOfChannel = 1;

    // Setup ADC
    ADC_Init(ADC1, &ADC_InitStructure);
    // Enable ADC 1
    ADC_Cmd(ADC1, ENABLE);

    // Enable ADC1 reset calibaration register
    ADC_ResetCalibration(ADC1);
    // Check end of reset calib reg
    while(ADC_GetResetCalibrationStatus(ADC1));
    //Start ADC1 calib
    ADC_StartCalibration(ADC1);
    // Check the end of ADC1 calib
    while(ADC_GetCalibrationStatus(ADC1));
}
//*****************************************************************************
// Function to return the value of ADC ch
u16 NEW_readADC1(u8 channel)
{
    // Config the channel to be sampled
    ADC_RegularChannelConfig(ADC1, channel, 1, ADC_SampleTime_239Cycles5);
    // Start the conversion
    ADC_SoftwareStartConvCmd(ADC1, ENABLE);
    // Wait until conversion complete
    while(ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC) == RESET);
    // Get the conversion value
    return ADC_GetConversionValue(ADC1);
}
//*****************************************************************************