main.c

射频识别利用nrf 2401芯片实现收发功能

#include  <msp430x12x2.h>
#include  "timer.h"
#include  "flash.h"
#include  "2401A.h"
#define PERIED  30      //define how many times send out a search writer code

#define CardNumber  32   //every card should change this number!!!!!!!!!!!!!!!!

unsigned char BUFFER[26];       //used to store the information of the card
unsigned char CardInf[26];
unsigned char ADR[4]={0x66,0x88,0x88,0x66};		//要读取的卡号
unsigned char counter;

/*****************************************************/

/*****************************************************/
void main(void)
{
  unsigned char i;
//  unsigned char *Flash_ptr;
  unsigned int temp;
//  unsigned char tembuff[26]={0,0,0,14,  1,   48,74,53,23,   0,36,  0x1c,0,0,0,4,0xff,0xff,0xff,0xff,0xff,  0xff,0xff,0xff,0xff,0xff};
  WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT
  intPORT();
  powerUP2401A();
  initFlash();


//  write_SegB(tembuff,26);
//testRF();

  Nrf2401Config();
  powerOFF2401A();
//counter is used to let card receive write command
  counter = 0;
//read the 29 bytes information from the flash
//        Flash_ptr = (unsigned char *) 0x1000;       //information is stored in flashB of information flash
        for(i=0; i<26; i++)
        {
           CardInf[i] = 0;
        }
        temp = CardNumber;
        CardInf[0] = temp & 0xff;
        CardInf[1] = (temp>>8) & 0xff;

  initTimerA();
  _BIS_SR(LPM3_bits + GIE);                 // Enter LPM3 w/ interrupt
}

// Timer A0 interrupt service routine
#pragma vector=TIMERA0_VECTOR
__interrupt void Timer_A (void)
{
//        unsigned char flag;
//        unsigned char i;
  _BIC_SR(GIE);       //close interupt
  TACTL = MC_0 + TACLR;     //stop the timerA
  CCTL0 = 0;                             // CCR0 interrupt enabled
  //power up the 2401A
        powerUP2401A();
/*
  //send out the information
if(counter == PERIED)
{
  //send 0xaaaa5555 to writer
        BUFFER[0] = 0xaa;
        BUFFER[1] = 0xaa;
        BUFFER[2] = 0x55;
        BUFFER[3] = 0x55;
        BUFFER[4] = CardInf[0];
        BUFFER[5] = CardInf[1];
        BUFFER[6] = CardInf[2];
        BUFFER[7] = CardInf[3];
        Nrf2401TX(BUFFER,ADR);
}
else
{
*/
        Nrf2401TX(CardInf,ADR);
        delayNms(5);
/*
}
if(counter == PERIED)
{
  counter = 0;
  //change to receive mode
        SetRxMode();
  //wait 30 ms to see if there is a writer instrument there
        flag = 0;
        flag = Nrf2401RXDelay(BUFFER);
  //if there is no writer, go back to LPM3 state. if there is one there, receive the information and write them
  //to the flash, configure the 2401A again for new power emition. and go to LPM3 at last.
        if(flag == 1)
        {
           Nrf2401RX(BUFFER);
           write_SegB (BUFFER,26);
           for(i=0; i<26; i++)
            {
               CardInf[i] = BUFFER[i];
            }
        }
  //set to send mode
        intPORT();
        powerUP2401A();
        Nrf2401Config();
}
*/
  powerOFF2401A();
  initTimerA();
  P2OUT = P2OUT ^ 0x01;
  counter ++;
  if(counter == 40)
    counter = 0;
}