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jasmine126
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| #int_rda interrupt for RFID reader |
 Posted: Sat Jun 07, 2008 12:25 pm |
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i'm using a parallax rfid reader to read tags and display on a LCD screen. here's my code:
| Code: |
#include <18F4550.h>
#fuses HSPLL,NOWDT,NOPROTECT,NOLVP,NODEBUG,USBDIV,PLL5,CPUDIV2,VREGEN
#use delay(clock=48000000)
#include <lcd.c>
#define LCD_E PIN_D0
#define LCD_RS PIN_D1
#define LCD_RW PIN_D2
#define LCD_DB4 PIN_D4
#define LCD_DB5 PIN_D5
#define LCD_DB6 PIN_D6
#define LCD_DB7 PIN_D7
#use rs232 (baud=2400, xmit=PIN_C6, rcv=PIN_C7, stream=RFID)
#int_rda
void rda_isr(void)
{
char val;
val = fgetc(RFID);
putc(val);
if (val=fgetc(RFID)=="0F02A670DF"){
lcd_putc("\f tag detected");
output_high(PIN_C6); //deactivate reader
}
}
void main(){
lcd_init();
lcd_putc("\f Start");
enable_interrupts(int_rda);
enable_interrupts(global);
output_low(PIN_C6); //activate reader
while(1);
}
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It doesn't work! The reader has to be pulled low to be activated. But when i measured the voltage (ground to pinc6 which is connected to the reader's enable pin), i get 5V instead. Can i compare like this? val=fgetc(RFID)=="0F02A670DF" even though i didn't save any data in my pic. seriously need help! :(
thanks! |
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meereck
Joined: 09 Nov 2006
Posts: 173
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| Posted: Sun Jun 08, 2008 4:02 am |
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| for comparing strings, you should use strcmp function. Look it up in the CCS compiler manual or search this forum. |
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