给我一个adc输入然后dac输出的keil程序

以下是一个基本的 ADC 和 DAC 的代码示例，使用 Keil µVision IDE 编写，将 ADC 转换的值通过 DAC 输出。这个例子使用了 STM32F4xx MCU。

#include "stm32f4xx.h"

#define ADC1_DR_ADDRESS     ((uint32_t)0x4001204C)
#define DAC_DHR12R1_ADDRESS ((uint32_t)0x40007408)

void ADC_Config(void);
void DAC_Config(void);

int main(void) {
    uint16_t ADCValue;

    ADC_Config();
    DAC_Config();

    while (1) {
        ADC_SoftwareStartConv(ADC1);
        while (ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC) == RESET);
        ADCValue = ADC_GetConversionValue(ADC1);
        DAC_SetChannel1Data(DAC_Align_12b_R, ADCValue);
    }
}

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

    /* Enable GPIOA clock */
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);

    /* Configure ADC1 Channel 0 pin as analog input */
    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);

    /* Enable the HSI oscillator */
    RCC_HSICmd(ENABLE);

    /* Wait until the HSI oscillator is ready */
    while (RCC_GetFlagStatus(RCC_FLAG_HSIRDY) == RESET);

    /* Configure the ADC clock */
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

    /* ADC Common Init */
    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);

    /* ADC1 Init */
    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);

    /* ADC1 Regular Channel Config */
    ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_3Cycles);

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

void DAC_Config(void) {
    GPIO_InitTypeDef GPIO_InitStructure;
    DAC_InitTypeDef  DAC_InitStructure;

    /* Enable GPIOA clock */
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);

    /* Configure PA.04 (DAC1_OUT1) as analog output */
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    /* Enable DAC clock */
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE);

    /* DAC channel1 Configuration */
    DAC_InitStructure.DAC_Trigger = DAC_Trigger_None;
    DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Enable;
    DAC_Init(DAC_Channel_1, &DAC_InitStructure);

    /* Enable DAC Channel1 */
    DAC_Cmd(DAC_Channel_1, ENABLE);

    /* Set DAC Channel1 DHR12R register */
    DAC_SetChannel1Data(DAC_Align_12b_R, 0x0000);
}

这个代码将 ADC1 配置为单次转换模式，使用 PA0 作为 ADC 输入通道。DAC1 用于输出，使能 GPIOA4 作为模拟输出。然后在 while 循环中，读取 ADC1 转换值并将其写入 DAC1 输出寄存器。这个例子可以根据需要进行修改，以适应特定的应用场景。