STM32 上的 ADC 单次转换

我正在研究 STM32 F103x 上的 ADC 编程，并从最简单的情况 - 单次转换开始。 测量内部温度传感器（连接到 ADC1）的值，并使用 USART 将其发送到 COM 端口。目标似乎很明确，但是当我尝试将源代码下载到闪存时，它不会向 COM 端口发送任何数据。 USART功能运行良好，我猜问题来自ADC配置部分，因为我陷入等待完成转换的循环中：

while(ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC) == RESET); //Wail for conversion complete

这是到目前为止我的源代码。

/* Includes ------------------------------------------------------------*/
#include "stm32f10x.h"
#include <stdio.h>

    uint16_t AD_value;
    const uint16_t V25 = 1750; //when V25=1.41V
    const uint16_t Avg_Slope = 5; //when avg_slc
    uint16_t TemperatureC;

//Define output device
PUTCHAR_PROTOTYPE
{
    USART_SendData(USART1, (uint8_t) ch);
    while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET)
    {}
    return ch;
}

void Usart1Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    USART_InitTypeDef USART_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);

    /* COnfig PA9 for USART Tx as alternate function push-pull */
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    /* COnfig PA10 for USART Rx as input floating */
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    /* USARTx configured as follow:
        - BaudRate = 9600 baud  
        - Word Length = 8 Bits
        - One Stop Bit
        - No parity
        - Hardware flow control disabled (RTS and CTS signals)
        - Receive and transmit enabled
    */  
    USART_InitStructure.USART_BaudRate = 9600;
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;
    USART_InitStructure.USART_StopBits = USART_StopBits_1;
    USART_InitStructure.USART_Parity = USART_Parity_No;
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;

    /* USART configuration */
    USART_Init(USART1, &USART_InitStructure);
    USART_Cmd(USART1, ENABLE);  

}

int main(void)
{

    ADC_InitTypeDef ADC_InitStructure;
    Usart1Init();

    RCC_ADCCLKConfig(RCC_PCLK2_Div6); //ADCCLK = PCLK22/6 = 72/6=12MHz
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE); //Enable ADC1 Clock

    /* ADC1 configuration */
    ADC_DeInit(ADC1); //Power-on default
    ADC_InitStructure.ADC_Mode = ADC_Mode_Independent; //Independent conversion mode (single)
    ADC_InitStructure.ADC_ScanConvMode = DISABLE; //Convert single channel only
    ADC_InitStructure.ADC_ContinuousConvMode = DISABLE; //Convert 1 time
    ADC_InitStructure.ADC_ExternalTrigConv = DISABLE; //No external triggering
    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //Right 12-bit data alignment
    ADC_InitStructure.ADC_NbrOfChannel = 1; //single channel conversion
    ADC_Init(ADC1, &ADC_InitStructure);
    ADC_TempSensorVrefintCmd(ENABLE); //wake up temperature sensor
    ADC_Cmd(ADC1, ENABLE); //Enable ADC1
    ADC_ResetCalibration(ADC1); //Enable ADC1 reset calibration register
    while(ADC_GetResetCalibrationStatus(ADC1)); //check the end of ADC1 reset calibration register  
    ADC_StartCalibration(ADC1); //Start ADC1 calibration
    while(ADC_GetCalibrationStatus(ADC1)); //Check the end of ADC1 calibration
    ADC_RegularChannelConfig(ADC1, ADC_Channel_16, 1, ADC_SampleTime_1Cycles5); //Select 1.5 cycles conversion for channel 16
    ADC_SoftwareStartConvCmd(ADC1, ENABLE); //Start ADC1 software conversion
    while(ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC) == RESET); //Wail for conversion complete
    AD_value = ADC_GetConversionValue(ADC1); //Read ADC value
    ADC_ClearFlag(ADC1, ADC_FLAG_EOC); //Clear EOC flag

    printf("\r\n ADC value: %d \r\n", AD_value);
    TemperatureC = (uint16_t)((V25-AD_value)/Avg_Slope+25);
    printf("Temperature: %d%cC\r\n", TemperatureC, 176);
    while (1)
    {}  
}

任何想法表示赞赏！

我将尝试解释源代码发生了什么。

1- 禁用的定义为零： typedef enum {DISABLE = 0, ENABLE = !DISABLE} 功能状态；

2-所以当你写“ADC_InitStructure.ADC_ExternalTrigConv = DISABLE;”时实际上，您将其分配为零，如下所示“ADC_InitStructure.ADC_ExternalTrigConv = 0;

3-这意味着您将 ADC_CR2 寄存器的 EXTSEL 分配为零。

4-如果 EXTSEL 为零，则 adc 转换取决于定时器来启动。

5-如果希望adc由软件启动，EXTSEL必须为0x000E0000；

6- 正如您可以猜测的那样，“ADC_ExternalTrigConv_None”的值定义为 0x000E0000；

so while(ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC) == RESET);代码会挂在这里，因为它依赖定时器来启动，不启动就无法结束。