MicroC rs-485，pic16f887字符串发送问题

Question

如何将字符串“master”从主图片发送到从属程序？

我使用的是MicroC RS-485库示例：

library.htm

我试图把字符串从主程序发送到奴隶:并设置dat7 =“master”；期望dat7在从服务器上使用我的字符串，但是我得到了空值.

链接底部的原始代码。

主控

char dat[10];                          // buffer for receving/sending messages
char i,j;

sbit  rs485_rxtx_pin  at RC2_bit;               // set transcieve pin
sbit  rs485_rxtx_pin_direction at TRISC2_bit;   // set transcieve pin direction

// Interrupt routine
void interrupt() {
  RS485Master_Receive(dat);
}

void main(){
  long cnt = 0;

  ANSEL  = 0;                          // Configure AN pins as digital I/O
  ANSELH = 0;
  C1ON_bit = 0;                        // Disable comparators
  C2ON_bit = 0;

  PORTB  = 0;
  PORTD  = 0;
  TRISB  = 0;
  TRISD  = 0;


  UART1_Init(9600);                    // initialize UART1 module
  Delay_ms(100);

  RS485Master_Init();                  // initialize MCU as Master
  dat[0] = 0xAA;
  dat[1] = 0xF0;
  dat[2] = 0x0F;
  dat[4] = 0;                          // ensure that message received flag is 0
  dat[5] = 0;                          // ensure that error flag is 0
  dat[6] = 0;
  dat[7] = "MY STRING";

  RS485Master_Send(dat,1,160);


  RCIE_bit = 1;                        // enable interrupt on UART1 receive
  TXIE_bit = 0;                        // disable interrupt on UART1 transmit
  PEIE_bit = 1;                        // enable peripheral interrupts
  GIE_bit = 1;                         // enable all interrupts

  while (1){
                                       // upon completed valid message receiving
                                       //   data[4] is set to 255
    cnt++;
    if (dat[5])  {                     // if an error detected, signal it
      PORTD = 0xAA;                    //   by setting portd to 0xAA
    }
    if (dat[4]) {                      // if message received successfully
      cnt = 0;
      dat[4] = 0;                      // clear message received flag
      j = dat[3];
      for (i = 1; i <= dat[3]; i++) {  // show data on PORTB
        PORTB = dat[i-1];
      }                                // increment received dat[0]
      dat[0] = dat[0]+1;               // send back to master
      Delay_ms(1);
      RS485Master_Send(dat,1,160);

    }
   if (cnt > 100000) {
      PORTD ++;
      cnt = 0;
      RS485Master_Send(dat,1,160);
      if (PORTD > 10)                  // if sending failed 10 times
        RS485Master_Send(dat,1,50);    //   send message on broadcast address
     }
  }

}

奴隶：

char dat[9];             // buffer for receving/sending messages
char i,j;

sbit  rs485_rxtx_pin at RC2_bit;             // set transcieve pin
sbit  rs485_rxtx_pin_direction at TRISC2_bit;   // set transcieve pin direction

// Interrupt routine
void interrupt() {
 RS485Slave_Receive(dat);
}

void main() {
  ANSEL  = 0;                        // Configure AN pins as digital I/O
  ANSELH = 0;
  C1ON_bit = 0;                      // Disable comparators
  C2ON_bit = 0;

  PORTB = 0;
  PORTD = 0;
  TRISB = 0;
  TRISD = 0;
  PORTA = 0;
  TRISA = 0;


  UART1_Init(9600);                  // initialize UART1 module
  Delay_ms(100);
  RS485Slave_Init(160);              // Intialize MCU as slave, address 160

  dat[4] = 0;                        // ensure that message received flag is 0
  dat[5] = 0;                        // ensure that message received flag is 0
  dat[6] = 0;                        // ensure that error flag is 0

  RCIE_bit = 1;                      // enable interrupt on UART1 receive
  TXIE_bit = 0;                      // disable interrupt on UART1 transmit
  PEIE_bit = 1;                      // enable peripheral interrupts
  GIE_bit = 1;                       // enable all interrupts

  while (1) {
    if(dat[7]=="MY STRING"){
      RCA0_bit = 1;
    }

    if (dat[5])  {                   // if an error detected, signal it by
      PORTD = 0xAA;                  //   setting portd to 0xAA
      dat[5] = 0;
    }
    if (dat[4]) {                    // upon completed valid message receive
      dat[4] = 0;                    //   data[4] is set to 0xFF
      j = dat[3];
      for (i = 1; i <= dat[3];i++){
        PORTB = dat[i-1];
      }
      dat[0] = dat[0]+1;             // increment received dat[0]
      Delay_ms(1);
      RS485Slave_Send(dat,1);        //   and send it back to master
    }
  }
}

​

​

Answer 1

char dat[9];定义了一个9字节的数组，所以dat[7] = "MY STRING";只会存储一个截断的地址，而不是实际的字符串。memcpy可用于将字符串从一个缓冲区复制到另一个缓冲区。

请参阅：http://www.cplusplus.com/reference/cstring/memcpy/

dat[7]=="MY STRING"将不像您比较字符串文本"MY STRING"的2字节地址和存储在dat[7]中的单个字节一样工作。如果需要比较字符串之间的差异，strcmp可以工作。

请参阅：http://www.cplusplus.com/reference/cstring/strcmp/