keil中用ADC采集芯片内部温度代码

以下是一个基于STM32F4xx系列芯片的Keil项目示例，可以实现使用ADC采集芯片内部温度，并将结果通过串口输出：

#include <stdio.h>
#include "stm32f4xx.h"

#define ADC_CHANNEL_TEMPSENSOR 16

void ADC_Config(void);
void USART_Config(void);

int main(void)
{
    uint32_t adc_value;
    float temperature;

    ADC_Config();
    USART_Config();

    while(1)
    {
        ADC_SoftwareStartConv(ADC1);
        while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC));
        adc_value = ADC_GetConversionValue(ADC1);

        temperature = ((float)adc_value - (float)0x7FF) / ((float)0xFFFF - (float)0x7FF) * 3.3f / (float)2.5f + (float)25.0f;

        printf("Temperature: %.2f\r\n", temperature);

        Delay(1000);
    }
}

void ADC_Config(void)
{
    ADC_InitTypeDef ADC_InitStructure;
    GPIO_InitTypeDef GPIO_InitStructure;
    ADC_CommonInitTypeDef ADC_CommonInitStructure;

    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
    ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;
    ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
    ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
    ADC_CommonInit(&ADC_CommonInitStructure);

    ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
    ADC_InitStructure.ADC_ScanConvMode = DISABLE;
    ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
    ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
    ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
    ADC_InitStructure.ADC_NbrOfConversion = 1;
    ADC_Init(ADC1, &ADC_InitStructure);

    ADC_TempSensorVrefintCmd(ENABLE);

    ADC_RegularChannelConfig(ADC1, ADC_CHANNEL_TEMPSENSOR, 1, ADC_SampleTime_480Cycles);

    ADC_Cmd(ADC1, ENABLE);
}

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

    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);

    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    GPIO_PinAFConfig(GPIOA, GPIO_PinSource2, GPIO_AF_USART2);
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource3, GPIO_AF_USART2);

    USART_InitStructure.USART_BaudRate = 115200;
    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_Init(USART2, &USART_InitStructure);

    USART_Cmd(USART2, ENABLE);
}

void Delay(uint32_t nCount)
{
    while(nCount--)
    {
        __NOP();
    }
}

上述代码中，首先定义了一个`ADC_CHANNEL_TEMPSENSOR`常量，表示温度传感器所在的ADC通道。在`ADC_Config`函数中，对ADC和GPIO进行初始化，同时使能温度传感器，并将其作为一个常规的ADC通道进行采样。在主函数中，通过`ADC_SoftwareStartConv`函数触发ADC转换，并在转换完成后对结果进行处理，最后通过串口输出温度值。需要注意的是，由于芯片内部温度传感器的精度较低，需要进行一定的数值转换才能得到准确的温度值。