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[英]PIC16F887 UART read a string and then cut that string into 3 arrays
[英]MicroC rs-485, pic16f887 String sending problems
如何將字符串“ MY STRING”從主圖像發送到從屬圖像?
我正在使用MicroC RS-485庫示例:
http://www.mikroe.com/download/eng/documents/compilers/mikroc/pro/pic/help/rs-485_library.htm
我試圖將字符串從主機發送到從機:並設置dat [7] =“ my string”; 我的字符串在奴隸上期望dat [7]但我得到空值...
鏈接底部的原始代碼。
主
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
}
}
}
奴隸:
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
}
}
}
char dat[9];
定義9個字節的數組,因此dat[7] = "MY STRING";
將僅存儲截斷的地址,而不存儲實際的字符串。 memcpy
可用於將字符串從一個緩沖區復制到另一個緩沖區。
參見: http : //www.cplusplus.com/reference/cstring/memcpy/
dat[7]=="MY STRING"
將字符串文字"MY STRING"
的2字節地址與dat[7]
存儲的單個字節進行比較時不起作用。 如果您需要比較字符串之間的差異,則strcmp
可以使用。
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