S12 / MagniV MicrocontrollersのトピックRe: Parallax RFID interface

Parallax RFID interface

tcrite — Mon, 11 Apr 2011 22:02:20 GMT

Hi all,

This is my first post in the forums, so please forgive me in advance if it is not fully up to par. I'm trying to interface a parallax RFID reader to my MC9S12DG256 dragon board. The reader sends out 12 bytes of data with a start byte of 0x0A and a stop byte of 0x0D. I have the sout of the reader connected to pin PS2 of the dragon board. Here is the code I have written so far in Codewarrior:

#include <hidef.h>      /* common defines and macros */
#include <mc9s12dg256.h>     /* derivative information */

#pragma LINK_INFO DERIVATIVE "mc9s12dg256b"

char code[10];

void init_SCI1(void);
char getcSCI1(void);
void delay(int);
void init_PLL(void);
#define RDRF 1;

void main(){
int val;
int i;
int bytesRead;
init_SCI1();

DDRJ |= 0x02;   // PJ1 outputs
PTJ &= ~0x02;   // PJ1 = 0 to enable on-board LEDs for use with Port B
DDRB = 0xFF; // Port B outputs

for(;{
    if((val = getcSCI1()) > 0){
      if(SCI1DRL == 0x0A){
        bytesRead = 0;
        while(bytesRead < 10){
          if(SCI1DRL > 0){
            val = getcSCI1();
            if((val == 0x0A) || (val == 0x0D)){
              break;
            }
            code[bytesRead] = val;
            bytesRead++;
          }
        }
      }
    }
    for(i = 10; i > 0; i--){
      PORTB = code[i];
      delay(1000);
    }
}
}

/***************functions*****************/

void init_PLL( ){ // initializes phase-locked loop (hardware)for 24Mhz CPU clock
   asm(sei);        // for running board standalone w/out Codewarrior
   CLKSEL &= ~0x80;
   PLLCTL |= 0x40;
   SYNR = 0x05;
   REFDV = 0x01;
   while((CRGFLG & 0x08) == 0){ // wait here for lock
      CRGFLG |= 0x08;
   }
   CLKSEL |= 0x80;
   asm(cli);
}

void init_SCI1(){
SCI1BDH = 0x02; // Baud Div = 24MHz/(16x2400) = 625 =0x271
SCI1BDL = 0x71;   // MSB of baud rate registers
SCI1CR1 = 0x00;
SCI1CR2 = 0x04;   // enable receive
}

char getcSCI1(){
while(!(SCI1SR1 & 1)){}
return (SCI1DRL);
}

void delay(int del){
int i,j;
   for(i=0; i<del; i++)
       for(j=0; j<2000; j++);
}

Any help would be greatly appreciated. Thanks.

Re: Parallax RFID interface

tcrite — Thu, 14 Apr 2011 22:45:13 GMT

Please disregard this post. I found what I was doing wrong.

Re: Parallax RFID interface

hull — Fri, 15 Apr 2011 12:13:34 GMT

Glad, you get the bug out. I am also interested in interfacing the Parallax RFID to the Dragon board. Can you share your working code. Thanks.

Re: Parallax RFID interface

tcrite — Thu, 21 Apr 2011 08:56:10 GMT

No problem. I'm sorry if it looks kinda sloppy, I haven't put in comments yet. I'm using Tera Term to output the tag id.

#include <hidef.h>      /* common defines and macros */
#include <mc9s12dg256.h>     /* derivative information */
#include "TERMIOSCI.H"
#include <stdio.h>

#pragma LINK_INFO DERIVATIVE "mc9s12dg256b"

char code[11];

void init_SCI1(void);
char getcSCI1(void);
void delay(int);
void init_PLL(void);
#define RDRF 0x20;

void main(){
init_SCI1();
init_PLL();
TERMIO_Init();

DDRJ |= 0x02;   // PJ1 outputs
PTJ &= ~0x02;   // PJ1 = 0 to enable on-board LEDs for use with Port B
DDRB = 0xFF; // Port B outputs
SCI0BDL = 156;

for(;{}

}

/***************functions*****************/

void init_PLL(){ // initializes phase-locked loop (hardware)for 24Mhz CPU clock
   asm(sei);        // for running board standalone w/out Codewarrior
   CLKSEL &= ~0x80;
   PLLCTL |= 0x40;
   SYNR = 0x05;
   REFDV = 0x01;
   while((CRGFLG & 0x08) == 0){ // wait here for lock
      CRGFLG |= 0x08;
   }
   CLKSEL |= 0x80;
   asm(cli);
}

void init_SCI1(){
SCI1BDH = 0x02; // Baud Div = 24MHz/(16x2400) = 625 =0x271
SCI1BDL = 0x71;   // MSB of baud rate registers
SCI1CR1 = 0xA0;
SCI1CR2 = 0x24;   // enable receive and transmit
}

char getcSCI1(){
while(!(SCI1SR1 & 0x20)){}
SCI1SR1;
return (SCI1DRL);
}

#pragma CODE_SEG NON_BANKED

interrupt 21 void SCI_INT(){

int val;
int i = 0;
int bytesRead;
if((val = getcSCI1()) > 0){
      if(val == 0x0A){
        bytesRead = 0;
        i = 0;
        while(bytesRead < 10){
          if(SCI1DRL > 0){
            val = getcSCI1();
            if((val == 0x0A) || (val == 0x0D)){
              break;
            }

            code[bytesRead] = val;
            bytesRead++;
            i++;
          }
          if(bytesRead == 10){
            code[10] = '\0';
          }
        }
      }
    }
    if(i == 10){
      printf("Tag code is: %s\n\r", code);
      i = 0;
    }
}

#pragma CODE_SEG DEFAULT

void delay(int del){
int i,j;
   for(i=0; i<del; i++)
       for(j=0; j<2000; j++);
}

Re: Parallax RFID interface

hull — Mon, 25 Apr 2011 02:52:25 GMT

Thanks for sharing your code. I'll try it.

Re: Parallax RFID interface

eliezeroc — Thu, 14 Jan 2016 10:15:05 GMT

Hello friend, I'm trying to read TAG 1K with EN 60 and RFID-RC522a but I failed. You have any ideas to help me?

Thanks,

Re: Parallax RFID interface

charlesbrown — Mon, 11 Apr 2016 17:30:27 GMT

I'm trying to use a Parallax RFID for a project and hope that you would be willing to send me your complete code.