STC89C52与pycharm建串口通信，pycharm发送"open K0"P10口输出低电平，发送"close K0"P10口输出高电平，发送"open K1"P11口输出低电平，发送"close K1"P11口输出高电平，上位机代码，和下位机代码怎么写。

下位机代码可以使用C语言编写，使用STC89C52单片机的串口通信模块接收来自上位机的指令，并根据指令控制P10和P11口的输出电平。

一个简单的下位机代码如下：

#include <STC89C5xRC.H>
#include <string.h>

#define UART_BAUD_RATE 9600
#define FOSC 22118400L
#define TIMER1_RELOAD_VALUE -(FOSC/12/UART_BAUD_RATE)

void initUART() {
    TMOD &= 0x0F;
    TMOD |= 0x20;
    TH1 = TIMER1_RELOAD_VALUE / 256;
    TL1 = TIMER1_RELOAD_VALUE % 256;
    TR1 = 1;
    SCON = 0x50;
    ES = 1;
    EA = 1;
}

void sendByte(unsigned char value) {
    SBUF = value;
    while (!TI);
    TI = 0;
}

void sendString(char *string) {
    while (*string) {
        sendByte(*string++);
    }
}

unsigned char receiveByte() {
    unsigned char value;
    while (!RI);
    value = SBUF;
    RI = 0;
    return value;
}

void main() {
    char buffer[10];
    char *open_command = "open";
    char *close_command = "close";
    char *k0 = "K0";
    char *k1 = "K1";

    P1 = 0xFF;
    P1M0 = 0x00;
    P1M1 = 0x00;

    initUART();

    while (1) {
        unsigned char value = receiveByte();
        if (value == '\r') {
            buffer[0] = '\0';
            if (strncmp(open_command, buffer, strlen(open_command)) == 0) {
                if (strncmp(k0, buffer + strlen(open_command) + 1, strlen(k0)) == 0) {
                    P1 &= 0xFE;
                    sendString("K0 opened.\r\n");
                } else if (strncmp(k1, buffer + strlen(open_command) + 1, strlen(k1)) == 0) {
                    P1 &= 0xFD;
                    sendString("K1 opened.\r\n");
                } else {
                    sendString("Invalid command.\r\n");
                }
            } else if (strncmp(close_command, buffer, strlen(close_command)) == 0) {
                if (strncmp(k0, buffer + strlen(close_command) + 1, strlen(k0)) == 0) {
                    P1 |= 0x01;
                    sendString("K0 closed.\r\n");
                } else if (strncmp(k1, buffer + strlen(close_command) + 1, strlen(k1)) == 0) {
                    P1 |= 0x02;
                    sendString("K1 closed.\r\n");
                } else {
                    sendString("Invalid command.\r\n");
                }
            } else {
                sendString("Invalid command.\r\n");
            }
        } else {
            strncat(buffer, (char *)&value, 1);
        }
    }
}

上位机代码可以使用Python语言编写，使用`pyserial`库与下位机进行串口通信，发送指令控制P10和P11口的输出电平。

一个简单的上位机代码如下：

import serial
import time

ser = serial.Serial('COM1', 9600, timeout=1)

def send_command(command):
    ser.write(command.encode())
    response = ser.read(100)
    return response.decode()

while True:
    command = input('Enter command: ')
    if command == 'quit':
        break
    response = send_command(command + '\n')
    print(response.strip())
    time.sleep(0.1)

ser.close()

在上位机中，输入`open K0`可以打开P10口输出低电平，输入`close K0`可以关闭P10口输出高电平；输入`open K1`可以打开P11口输出低电平，输入`close K1`可以关闭P11口输出高电平。