写一段程序，用4个ADC0832分别接收4个MPX4115的数据，并输出到AT89C51中求平均值，MPX4115的1口接ADC0832的CH0，4个ADC0832的CLK接单片机P1.0，DO和DI接单片机P1.1，四个CS口分别接P1.2，P1.3，P1.4，P1.5

好的，以下是一份可能的程序示例：

#include <reg51.h>

#define ADC_CS1 P1_2  // ADC1 chip select
#define ADC_CS2 P1_3  // ADC2 chip select
#define ADC_CS3 P1_4  // ADC3 chip select
#define ADC_CS4 P1_5  // ADC4 chip select
#define ADC_CLK P1_0  // ADC clock
#define ADC_DIN P1_1  // ADC data input
#define ADC_DOUT P1_1 // ADC data output
#define NUM_ADCS 4     // number of ADCs
#define NUM_SAMPLES 16 // number of samples per channel

unsigned char adc_read(unsigned char cs, unsigned char ch);
void adc_write(unsigned char cs, unsigned char ch);
void delay();

void main()
{
    unsigned char i, j;
    unsigned int sum1 = 0, sum2 = 0, sum3 = 0, sum4 = 0;
    unsigned int adc_val1, adc_val2, adc_val3, adc_val4;
    unsigned int avg1, avg2, avg3, avg4;

    // main loop
    while (1)
    {
        // read samples from all channels
        for (i = 0; i < NUM_SAMPLES; i++)
        {
            adc_val1 = adc_read(ADC_CS1, 0);
            adc_val2 = adc_read(ADC_CS2, 0);
            adc_val3 = adc_read(ADC_CS3, 0);
            adc_val4 = adc_read(ADC_CS4, 0);
            sum1 += adc_val1;
            sum2 += adc_val2;
            sum3 += adc_val3;
            sum4 += adc_val4;
            delay();
        }

        // compute averages
        avg1 = sum1 / NUM_SAMPLES;
        avg2 = sum2 / NUM_SAMPLES;
        avg3 = sum3 / NUM_SAMPLES;
        avg4 = sum4 / NUM_SAMPLES;

        // output averages to UART or other peripheral
        // ...

        // reset sums
        sum1 = sum2 = sum3 = sum4 = 0;
    }
}

unsigned char adc_read(unsigned char cs, unsigned char ch)
{
    unsigned char i;
    unsigned char data = 0;

    // select ADC chip
    switch (cs)
    {
    case ADC_CS1:
        ADC_CS1 = 0;
        break;
    case ADC_CS2:
        ADC_CS2 = 0;
        break;
    case ADC_CS3:
        ADC_CS3 = 0;
        break;
    case ADC_CS4:
        ADC_CS4 = 0;
        break;
    }

    // send start bit, single-ended mode, and channel select bits
    adc_write(cs, ch);

    // read 8-bit ADC value
    for (i = 0; i < 8; i++)
    {
        ADC_CLK = 1;
        delay();
        data <<= 1;
        data |= ADC_DOUT;
        ADC_CLK = 0;
        delay();
    }

    // deselect ADC chip
    switch (cs)
    {
    case ADC_CS1:
        ADC_CS1 = 1;
        break;
    case ADC_CS2:
        ADC_CS2 = 1;
        break;
    case ADC_CS3:
        ADC_CS3 = 1;
        break;
    case ADC_CS4:
        ADC_CS4 = 1;
        break;
    }

    return data;
}

void adc_write(unsigned char cs, unsigned char ch)
{
    unsigned char i;
    unsigned char data = 0x80 | (ch << 4);

    for (i = 0; i < 8; i++)
    {
        ADC_CLK = 0;
        delay();
        ADC_DIN = data & 0x80;
        data <<= 1;
        ADC_CLK = 1;
        delay();
    }
}

void delay()
{
    unsigned int i, j;
    for (i = 0; i < 50; i++)
    {
        for (j = 0; j < 500; j++)
        {
            // delay loop
        }
    }
}

这个程序使用了一个 `adc_read()` 函数来从单个ADC芯片读取一个模拟输入的值。在 `main()` 函数中，通过循环读取每个通道的多个采样值，并将它们累加到一个总和中。然后，计算每个通道的平均值，并将它们输出到UART或其他外设。程序会不断循环读取和输出采样值，直到被中断或程序停止。

需要注意的是，这个程序仅供参考，具体实现可能需要根据硬件电路的实际情况进行修改和调整。同时，程序中没有包含UART或其他外设输出的代码，需要根据具体的需求进行添加。