James Nagendran / Mbed 2 deprecated 4180_final_RFID

RFID code for SLVM

Dependencies:   ID12RFID mbed

main.cpp@0:23e85e8989fc, 2014-12-03 (annotated)

Committer:
jnagendran3
Date:
Wed Dec 03 22:39:53 2014 +0000
Revision:
0:23e85e8989fc
YAY

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jnagendran3 0:23e85e8989fc 1 #include "mbed.h"
jnagendran3 0:23e85e8989fc 2 #include "ID12RFID.h"
jnagendran3 0:23e85e8989fc 3
jnagendran3 0:23e85e8989fc 4 ID12RFID rfid(p27); // uart rx
jnagendran3 0:23e85e8989fc 5 Serial pc(USBTX,USBRX);
jnagendran3 0:23e85e8989fc 6
jnagendran3 0:23e85e8989fc 7 DigitalOut interrupt(p23);
jnagendran3 0:23e85e8989fc 8 DigitalOut MSB(p21);
jnagendran3 0:23e85e8989fc 9 DigitalOut LSB(p22);
jnagendran3 0:23e85e8989fc 10 DigitalOut led1(LED1);
jnagendran3 0:23e85e8989fc 11 DigitalOut led2(LED2);
jnagendran3 0:23e85e8989fc 12 DigitalOut led3(LED3);
jnagendran3 0:23e85e8989fc 13
jnagendran3 0:23e85e8989fc 14 float speedModifiers[] = {
jnagendran3 0:23e85e8989fc 15 1.0, 0.7, 0.5, 0.3
jnagendran3 0:23e85e8989fc 16 };
jnagendran3 0:23e85e8989fc 17
jnagendran3 0:23e85e8989fc 18 int speedTags[] = {
jnagendran3 0:23e85e8989fc 19 5452129,
jnagendran3 0:23e85e8989fc 20 5449063,
jnagendran3 0:23e85e8989fc 21 36902518
jnagendran3 0:23e85e8989fc 22 };
jnagendran3 0:23e85e8989fc 23
jnagendran3 0:23e85e8989fc 24 volatile int tag = 0;
jnagendran3 0:23e85e8989fc 25 volatile bool tagRead = false;
jnagendran3 0:23e85e8989fc 26
jnagendran3 0:23e85e8989fc 27 int intCorrection;
jnagendran3 0:23e85e8989fc 28
jnagendran3 0:23e85e8989fc 29 void readCard();
jnagendran3 0:23e85e8989fc 30 void checkTag();
jnagendran3 0:23e85e8989fc 31
jnagendran3 0:23e85e8989fc 32 void readCard() {
jnagendran3 0:23e85e8989fc 33 // First, disable interrupts to allow critical sections to run through
jnagendran3 0:23e85e8989fc 34 NVIC_DisableIRQ(UART2_IRQn);
jnagendran3 0:23e85e8989fc 35 //led3 = !led3;
jnagendran3 0:23e85e8989fc 36 if(rfid.readable()) {
jnagendran3 0:23e85e8989fc 37 tag = rfid.read();
jnagendran3 0:23e85e8989fc 38 tagRead = true;
jnagendran3 0:23e85e8989fc 39 bool match = false;
jnagendran3 0:23e85e8989fc 40 int length = (sizeof(speedTags)/sizeof(speedTags[0]) < sizeof(speedModifiers)/sizeof(speedModifiers[0])) ? (sizeof(speedTags)/sizeof(speedTags[0])) : (sizeof(speedModifiers)/(sizeof(speedModifiers[0])));
jnagendran3 0:23e85e8989fc 41 for (int i=0; i<length; i++) {
jnagendran3 0:23e85e8989fc 42 if (speedTags[i] == tag) {
jnagendran3 0:23e85e8989fc 43 printf("RFID Tag number : %d\nSpeed now at %d\n", tag, ((int)(speedModifiers[i]*100)));
jnagendran3 0:23e85e8989fc 44 match = true;
jnagendran3 0:23e85e8989fc 45 intCorrection++;
jnagendran3 0:23e85e8989fc 46 }
jnagendran3 0:23e85e8989fc 47 }
jnagendran3 0:23e85e8989fc 48
jnagendran3 0:23e85e8989fc 49 // For some reason, this function is entered twice each time an RFID tag is read.
jnagendran3 0:23e85e8989fc 50 // This bit here is to detect that case and just ignore it, while still catching
jnagendran3 0:23e85e8989fc 51 // other cases and displaying a warning
jnagendran3 0:23e85e8989fc 52 if (!match and intCorrection == 0) {
jnagendran3 0:23e85e8989fc 53 printf("[ WARNING ] Tag number %d not recognized\n", tag);
jnagendran3 0:23e85e8989fc 54 }
jnagendran3 0:23e85e8989fc 55 else if (!match == 1) {
jnagendran3 0:23e85e8989fc 56 intCorrection = 0;
jnagendran3 0:23e85e8989fc 57 }
jnagendran3 0:23e85e8989fc 58 }
jnagendran3 0:23e85e8989fc 59
jnagendran3 0:23e85e8989fc 60 NVIC_EnableIRQ(UART2_IRQn);
jnagendran3 0:23e85e8989fc 61 }
jnagendran3 0:23e85e8989fc 62
jnagendran3 0:23e85e8989fc 63 void checkTag() {
jnagendran3 0:23e85e8989fc 64 }
jnagendran3 0:23e85e8989fc 65
jnagendran3 0:23e85e8989fc 66 int main() {
jnagendran3 0:23e85e8989fc 67 interrupt=0;
jnagendran3 0:23e85e8989fc 68 rfid.setInterrupt(&readCard);
jnagendran3 0:23e85e8989fc 69 printf("Entering main loop\n");
jnagendran3 0:23e85e8989fc 70 while(1) {
jnagendran3 0:23e85e8989fc 71 if (tagRead) {
jnagendran3 0:23e85e8989fc 72 checkTag();
jnagendran3 0:23e85e8989fc 73 if(tag==5452129 || tag==5449063) LSB=1;
jnagendran3 0:23e85e8989fc 74 else LSB=0;
jnagendran3 0:23e85e8989fc 75 if(tag==5449063 || tag==36902518) MSB=1;
jnagendran3 0:23e85e8989fc 76 else MSB=0;
jnagendran3 0:23e85e8989fc 77 interrupt=1;
jnagendran3 0:23e85e8989fc 78 led1=MSB;
jnagendran3 0:23e85e8989fc 79 led2=LSB;
jnagendran3 0:23e85e8989fc 80 led3=interrupt;
jnagendran3 0:23e85e8989fc 81 wait(.5);
jnagendran3 0:23e85e8989fc 82 interrupt=0;
jnagendran3 0:23e85e8989fc 83 led3=interrupt;
jnagendran3 0:23e85e8989fc 84 tagRead = false;}
jnagendran3 0:23e85e8989fc 85 //led1 = 1; wait(0.5);
jnagendran3 0:23e85e8989fc 86 //led1 = 0; wait(0.5);
jnagendran3 0:23e85e8989fc 87 wait(.1);
jnagendran3 0:23e85e8989fc 88 }
jnagendran3 0:23e85e8989fc 89 }