Matthew McGraw
Uses an ID20 RFID Reader to create a tag list with a few functions that include: printing the current list, checking if a tag exists in the list, adding a tag to the list, and deleting a tag from the list
Dependencies: ID12RFID TextLCD mbed
Code to create an RFID Tag List. Page is located at http://mbed.org/users/memsterjr09/notebook/rfid-tag-list-builder/
Revision 0:fa3fe200c570, committed 2013-10-16
- Comitter:
- memsterjr09
- Date:
- Wed Oct 16 03:14:09 2013 +0000
- Child:
- 1:867cf1706b42
- Commit message:
- RFID Tag List
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/ID12RFID.lib Wed Oct 16 03:14:09 2013 +0000 @@ -0,0 +1,1 @@ +https://mbed.org/users/simon/code/ID12RFID/#f04afa911cf5
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/RFID_Functions.h Wed Oct 16 03:14:09 2013 +0000
@@ -0,0 +1,28 @@
+#ifndef MBED_RFID_FUNCTIONS_H
+#define MBED_RFID_FUNCTIONS_H
+
+#include <stdio.h>
+#include <stdlib.h>
+
+/* structure for the Linked List Node */
+typedef struct llnode_t {
+ int data;
+ struct llnode_t *next;
+ struct llnode_t *prev;
+} LLNode;
+
+/* header for a linked List */
+typedef struct linkedlist_t {
+ LLNode *head;
+ LLNode *tail;
+} LinkedList;
+
+/* Function Prototypes*/
+LinkedList emptyList(); // Create Initial List
+void showList(LinkedList theList); // Print the whole list
+void addToList(LinkedList *pLL, int data); // Adds a ID to the list
+void deleteFromList(LinkedList *pll, int data); //Delete a list
+void addPhantom(LinkedList *pLL); //Put an empty node in the LL
+int lookUp(LinkedList IDList, int ID); // Sees if ID is in list (for adding/deleting purposes)
+
+#endif
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/TextLCD.lib Wed Oct 16 03:14:09 2013 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/pyeh9/code/TextLCD/#680ec8d5949c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Wed Oct 16 03:14:09 2013 +0000
@@ -0,0 +1,255 @@
+#include "mbed.h"
+#include "ID12RFID.h"
+#include "TextLCD.h"
+#include "RFID_Functions.h"
+
+
+DigitalIn show(p24); //PushButton to show list
+DigitalIn look(p23); //PushButton to look if user is in list
+DigitalIn add(p22); //PushButton to add user to list
+DigitalIn del(p21); //PushButton to delete user from list
+ID12RFID rfid(p14); // uart rx
+Serial pc(USBTX, USBRX); //PC Terminal Display
+TextLCD lcd(p15, p16, p17, p18, p19, p20); //LCD Screen Display
+int state = 0; // Will determine what pushbutton is being pressed
+LinkedList IDList = emptyList(); //initialize the IDList
+LLNode *toAdd = IDList.head; //Create an Empty Tag Node
+int ID = 0; // Initialize the ID number
+int found; // Flag that will determine if an ID exists in the list already
+int main()
+{
+ lcd.cls(); //Clear the Screen on Reset
+ // Initialize the pullup resistors in pushbutton
+ show.mode(PullUp);
+ look.mode(PullUp);
+ add.mode(PullUp);
+ del.mode(PullUp);
+ while(1) {
+ lcd.cls();
+ // Determine if any of the pushbuttons are being pressed, and update the state accordingly
+ if(!show) state = 1;
+ if(!look) state = 2;
+ if(!add) state = 3;
+ if(!del) state = 4;
+ switch(state) {
+ // Print the List
+ case 1:
+ lcd.printf("Printing List");
+ wait(1);
+ showList(IDList);
+ lcd.cls();
+ lcd.printf("List Printed");
+ state = 0;
+ wait(3);
+ break;
+ // Check to see if an ID exists in the list already
+ case 2:
+ int flag = false;
+ lcd.printf("Look Up Tag\n");
+ lcd.printf("Scan RFID Tag");
+ // Wait for a Tag to be scanned
+ while(!ID) {
+ if(rfid.readable()) {
+ ID = rfid.read();
+ }
+ wait(1);
+ }
+ lcd.cls();
+ LLNode *node = IDList.head;
+ // Traverse through the list. Will figure out if the tag exists in the list already
+ while(node->data != NULL) {
+ if(node->data == ID) {
+ lcd.printf("ID: %d\n", ID);
+ lcd.printf("Was Found");
+ ID = 0;
+ state = 0;
+ wait(3);
+ flag = true;
+ break;
+ }
+ node = node->next;
+ }
+ // If the flag was set, then the tag was found in the list, so don't want to do the Not Found part
+ if(flag) break;
+ lcd.printf("ID: %d\n", ID);
+ lcd.printf("Was Not Found");
+ ID = 0;
+ state = 0;
+ wait(3);
+ break;
+ // Add a tag to the list
+ case 3:
+ lcd.printf("Add Tag\n");
+ lcd.printf("Scan RFID Tag");
+ // Wait or a tag scan
+ while(!ID) {
+ if(rfid.readable()) {
+ ID = rfid.read();
+ }
+ wait(1);
+ }
+ lcd.cls();
+ // Determine if the Tag already exists in the list
+ found = lookUp(IDList, ID);
+ // Tag previously exists
+ if(found) {
+ lcd.printf("ID: %d\n", ID);
+ lcd.printf("Exists in List");
+ ID = 0;
+ state = 0;
+ wait(3);
+ break;
+ // Tag doesn't exist
+ } else {
+ addToList(&IDList, ID);
+ lcd.printf("ID: %d\n", ID);
+ lcd.printf("Added to List");
+ ID = 0;
+ state = 0;
+ wait(3);
+ break;
+ }
+ // Delete a tag from the list
+ case 4:
+ lcd.printf("Delete Tag\n");
+ lcd.printf("Scan RFID Tag");
+ // Wait for a tag scan
+ while(!ID) {
+ if(rfid.readable()) {
+ ID = rfid.read();
+ }
+ wait(1);
+ }
+ lcd.cls();
+ // Determine if the tag exists in the list
+ found = lookUp(IDList, ID);
+ // If it does, delete it from the list
+ if(found) {
+ deleteFromList(&IDList, ID);
+ lcd.printf("ID: %d\n", ID);
+ lcd.printf("Deleted");
+ ID = 0;
+ state = 0;
+ wait(3);
+ break;
+ // Otherwise, tell the user it doesn't exist
+ } else {
+ lcd.printf("ID: %d\n", ID);
+ lcd.printf("Not in List");
+ ID = 0;
+ state = 0;
+ wait(3);
+ break;
+ }
+ }
+ }
+}
+
+// Initializes an empty Tag list
+LinkedList emptyList()
+{
+ LinkedList it = {NULL, NULL};
+ addPhantom(&it);
+ return it;
+}
+
+// Print the list via USB Serial port to the PC
+void showList(LinkedList theList)
+{
+ LLNode *phere = theList.head; /* start at the head */
+ int n = 1;
+ pc.printf("***********\n"); //start the list
+ if(phere->data == 0) pc.printf("No Tags in List\n"); //List is empty
+ else pc.printf("%d: %d\n", n, phere->data); //List isn't empty, print first tag
+ n++;
+ while(phere->next) {
+ pc.printf("%d: %d\n", n, phere->next->data); // keep printing while there is still data
+ phere = phere->next; /* work forward via next ptrs */
+ n++;
+ }
+ pc.printf("***********\n\n"); // end the list
+}
+
+// Add a tag to the list (added to the back of the list)
+void addToList(LinkedList *pLL, int data)
+{
+ // If the list has no data, its the head of the list
+ if(pLL->head->data == NULL) {
+ pLL->head->data = data;
+ // otherwise you have to add a new node to the tail of the list
+ } else {
+ // Initialize the node
+ LLNode *toAdd = (LLNode *) malloc(sizeof(LLNode));
+ // Add the data and fix all of the pointers
+ toAdd->data = data;
+ toAdd->prev = pLL->tail;
+ toAdd->next = NULL;
+ pLL->tail->next = toAdd;
+ pLL->tail = toAdd;
+ }
+}
+
+// Used to create the first empty node in the initial list
+void addPhantom(LinkedList *pLL)
+{
+ /* create LLNode */
+ LLNode *phere = (LLNode *) malloc(sizeof(LLNode));
+ phere->data = NULL;
+ phere->next = NULL;
+ phere->prev = NULL;
+ pLL->head = phere;
+ pLL->tail = phere;
+}
+
+// delete a tag from the list
+void deleteFromList(LinkedList *pll, int data)
+{
+ // Flags used to delete
+ int flag = true;
+ int first = true;
+ // Get first node
+ LLNode *node = pll->head;
+ while(flag) {
+ // If you find the tag
+ if(node->data == data) {
+ // If its the first node, then you just have to move the head pointer
+ if(first) {
+ pll->head = pll->head->next;
+ flag = false;
+ // if its the last tag added... just adjust the tail pointers
+ } else {
+ if(node->next == NULL) {
+ pll->tail = node->prev;
+ node->prev->next = NULL;
+ flag = false;
+ //otherwise just skip the node in the list
+ } else {
+ node->prev->next = node->next;
+ node->next->prev = node->prev;
+ flag = false;
+ }
+ }
+ }
+ // Traverse through the list via next pointers
+ node = node->next;
+ first = false;
+ }
+}
+
+// Used to determine if a tag already exists in the list
+int lookUp(LinkedList IDList, int ID)
+{
+ int found = false;
+ LLNode *node = IDList.head;
+ // While the data isn't null, check it
+ while(node->data != NULL) {
+ if(node->data == ID) {
+ found = true;
+ return found;
+ }
+ // if the next pointer is null, we're at the end of the list;
+ if(node->next == NULL) return found;
+ node = node->next;
+ }
+ return found;
+}
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Wed Oct 16 03:14:09 2013 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/a9913a65894f \ No newline at end of file