具有多个pics而不是rs485的RPI - CCS编译器

我试图将rpi3视为主设备，pic为奴隶，rs485为网络媒体 . rpi在slave的id上循环，它逐个发送它们，并等待来自指定slave（pic）的回复 . 每个pic读取接收到的数据（地址）并将其与其地址进行比较，如果是一个，则pic必须回复rpi .

在rpi我使用pi4j java库，而在图片上我用CCS编译器编码 .

第一个问题是，当我从rpi发送图片中不存在的地址时，没有人回复rpi，并且我在以下指令中发送它的地址也不会回复 .

The code for RPI is:

import com.pi4j.io.gpio.GpioController;
import com.pi4j.io.gpio.GpioFactory;
import com.pi4j.io.gpio.GpioPinDigitalOutput;
import com.pi4j.io.gpio.PinState;
import com.pi4j.io.gpio.RaspiPin;
import com.pi4j.io.serial.*;
import com.pi4j.util.Console;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.sql.Time;


public class SerialExample {

    public void tryIt() throws InterruptedException, IOException {

        final Console console = new Console();

        // print program title/header
        console.title("<-- The Pi4J Project -->", "Serial Communication Example");

        // allow for user to exit program using CTRL-C
        console.promptForExit();

        // create an instance of the serial communications class
        final Serial serial = SerialFactory.createInstance();

        try {
            // create serial config object
            SerialConfig config = new SerialConfig();

            config.device("/dev/ttyAMA0")
                    .baud(Baud._9600)
                    .dataBits(DataBits._8)
                    .parity(Parity.NONE)
                    .stopBits(StopBits._1)
                    .flowControl(FlowControl.NONE);


            // open the default serial device/port with the configuration settings
            serial.open(config);
            final GpioController gpio = GpioFactory.getInstance();

            // provision gpio pin #01 as an output pin and turn on
            final GpioPinDigitalOutput cts = gpio.provisionDigitalOutputPin(RaspiPin.GPIO_04, "CTS", PinState.HIGH);

            while (true) {
                short i = 1; // pic ids
                while (i < 5) {
                    cts.high();
                    serial.write(String.valueOf(i));
                     System.out.println("to slave: " + i);
                    Thread.sleep(15);
                    cts.low();
                    Thread.sleep(150);
                    byte[] data = null;

                    while (serial.available() > 0) {
                        data = serial.read();
                    }
                    if (data == null) {
                        System.out.println("[null data]");
                    } else {
                        String myData = new String(data);
                        System.out.println("reply from slave: " + myData);
                    }
                    i++;
                    Thread.sleep(1000);
                }
            }
        } catch (IOException ex) {
            console.println(" ==>> SERIAL SETUP FAILED : " + ex.getMessage());
            return;
        }
    }
}

pic的代码在所有图片中很常见，唯一的区别是ID . Pic code is

#include <12F1822.h>
#include <String.h>
#fuses NOMCLR INTRC_IO PLL_SW
#use delay(clock=32000000)

#use rs232(baud=9600, xmit=Pin_A0, rcv=Pin_A1,enable=Pin_A2, bits=8, errors, stream=RS485)

void clear_usart_receiver(void) {
    char c;
    c = getc();
    c = getc();
}
int id [] = {0, 2};

void main() {

    while (1) {
        byte message[10];
        fgets(message, RS485);
        delay_ms(10);
        if (message[0] == '2')

        {
            fputs("s2 reply", RS485);
        }
        delay_ms(10);
        clear_usart_receiver();
    }
}

我试过删除clear_usart_receiver（）;从我的pic代码，然后当pic回复时，下一个不会，下一个按计划打印，以下将不打印任何内容，依此类推 .