Tim Vukman
RDM630 RFID Module with I2C LCD
Diff: main.cpp
- Revision:
- 0:b2f4150fe624
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Sat May 22 20:19:03 2010 +0000
@@ -0,0 +1,402 @@
+#include "mbed.h"
+//
+DigitalOut led1(LED1);
+DigitalOut led2(LED2);
+DigitalOut led3(LED3);
+DigitalOut led4(LED4);
+Serial RFID (p28,p27);
+I2C LCD (p9,p10);
+Serial pc (USBTX,USBRX);
+int LCD_address = 0x50; // I2C address of AL202C display
+int LCD_command = 0xFE; // Sets "command" for display
+int LCD_option = 0x00; // Used to pass value of display command ie Clear_Display
+int LCD_col = 0; // holder for column value 1 - 16
+int LCD_row = 0; // holder for row value 1 - 2
+//
+// Functions to be included in display library
+//**************************************************************************************
+//* Auto Scroll ON
+//**************************************************************************************
+void LCD_auto_scroll_On(int LCD_command, int LCD_option)
+{
+ LCD_command = 0xFE; // command designator
+ LCD_option = 0x51; // Auto Scroll On
+ char cmd[2];
+ cmd[0] = LCD_command; // 0xFE
+ cmd[1] = LCD_option; // 0x51
+ LCD.write(LCD_address, cmd, 2); // Send command element
+}
+//
+//**************************************************************************************
+//* Auto Scroll OFF
+//**************************************************************************************
+void LCD_auto_scroll_Off(int LCD_command, int LCD_option)
+{
+ LCD_command = 0xFE; // command designator
+ LCD_option = 0x52; // Auto Scroll Off
+ char cmd[2];
+ cmd[0] = LCD_command; // 0xFE
+ cmd[1] = LCD_option; // 0x52
+ LCD.write(LCD_address, cmd, 2); // Send command element
+}
+//
+//**************************************************************************************
+//* Clear Screen
+//**************************************************************************************
+void LCD_clear_screen(int LCD_command, int LCD_option)
+{
+ LCD_command = 0xFE; // command designator
+ LCD_option = 0x58; // Clear Screen
+ char cmd[2];
+ cmd[0] = LCD_command; // 0xFE
+ cmd[1] = LCD_option; // 0x58
+ LCD.write(LCD_address, cmd, 2); // Send command element
+}
+//
+//**************************************************************************************
+//* Auto Line Wrap ON
+//**************************************************************************************
+void LCD_line_wrap_On(int LCD_command, int LCD_option)
+{
+ LCD_command = 0xFE; // command designator
+ LCD_option = 0x43; // Auto Line Wrap On
+ char cmd[2];
+ cmd[0] = LCD_command; // 0xFE
+ cmd[1] = LCD_option; // 0x43
+ LCD.write(LCD_address, cmd, 2); // Send command element
+}
+//
+//**************************************************************************************
+//* Auto Line Wrap OFF
+//**************************************************************************************
+void LCD_line_wrap_Off(int LCD_command, int LCD_option)
+{
+ LCD_command = 0xFE; // command designator
+ LCD_option = 0x44; // Auto Line Wrap Off
+ char cmd[2];
+ cmd[0] = LCD_command; // 0xFE
+ cmd[1] = LCD_option; // 0x44
+ LCD.write(LCD_address, cmd, 2); // Send command element
+}
+//
+//**************************************************************************************
+//* Go Home
+//**************************************************************************************
+void LCD_go_home(int LCD_command, int LCD_option)
+{
+ LCD_command = 0xFE; // command designator
+ LCD_option = 0x48; // Go Home
+ char cmd[2];
+ cmd[0] = LCD_command; // 0xFE
+ cmd[1] = LCD_option; // 0x48
+ LCD.write(LCD_address, cmd, 2); // Send command element
+}
+//
+//**************************************************************************************
+//* Move Cursor Forward
+//**************************************************************************************
+void LCD_cursor_forward(int LCD_command, int LCD_option)
+{
+ LCD_command = 0xFE; // command designator
+ LCD_option = 0x4D; // Move Cursor Forward
+ char cmd[2];
+ cmd[0] = LCD_command; // 0xFE
+ cmd[1] = LCD_option; // 0x4D
+ LCD.write(LCD_address, cmd, 2); // Send command element
+}
+//
+//**************************************************************************************
+//* Move Cursor Backward
+//**************************************************************************************
+void LCD_cursor_backward(int LCD_command, int LCD_option)
+{
+ LCD_command = 0xFE; // command designator
+ LCD_option = 0x4C; // Move Cursor Backward
+ char cmd[2];
+ cmd[0] = LCD_command; // 0xFE
+ cmd[1] = LCD_option; // 0x4C
+ LCD.write(LCD_address, cmd, 2); // Send command element
+}
+//
+//**************************************************************************************
+//* Cursor Underline ON
+//**************************************************************************************
+void LCD_underline_on(int LCD_command, int LCD_option)
+{
+ LCD_command = 0xFE; // command designator
+ LCD_option = 0x4A; // Cursor Underline On
+ char cmd[2];
+ cmd[0] = LCD_command; // 0xFE
+ cmd[1] = LCD_option; // 0x4A
+ LCD.write(LCD_address, cmd, 2); // Send command element
+}
+//
+//**************************************************************************************
+//* Cursor Underline OFF
+//**************************************************************************************
+void LCD_underline_off(int LCD_command, int LCD_option)
+{
+ LCD_command = 0xFE; // command designator
+ LCD_option = 0x4B; // Cursor Underline Off
+ char cmd[2];
+ cmd[0] = LCD_command; // 0xFE
+ cmd[1] = LCD_option; // 0x4B
+ LCD.write(LCD_address, cmd, 2); // Send command element
+}
+//
+//**************************************************************************************
+//* Cursor Blinking Block ON
+//**************************************************************************************
+void LCD_blink_on(int LCD_command, int LCD_option)
+{
+ LCD_command = 0xFE; // command designator
+ LCD_option = 0x53; // Cursor Blinking Block On
+ char cmd[2];
+ cmd[0] = LCD_command; // 0xFE
+ cmd[1] = LCD_option; // 0x53
+ LCD.write(LCD_address, cmd, 2); // Send command element
+}
+//
+//**************************************************************************************
+//* Cursor Blinking Block OFF
+//**************************************************************************************
+void LCD_blink_off(int LCD_command, int LCD_option)
+{
+ LCD_command = 0xFE; // command designator
+ LCD_option = 0x54; // Cursor Blinking Block Off
+ char cmd[2];
+ cmd[0] = LCD_command; // 0xFE
+ cmd[1] = LCD_option; // 0x54
+ LCD.write(LCD_address, cmd, 2); // Send command element
+}
+//
+//**************************************************************************************
+//* Set Cursor Position
+//**************************************************************************************
+void LCD_cursor_position(int LCD_command, int LCD_option, int LCD_col, int LCD_row)
+{
+ LCD_command = 0xFE; // command designator
+ LCD_option = 0x47; // Cursor Blinking Block Off
+ char cmd[4];
+ cmd[0] = LCD_command; // 0xFE
+ cmd[1] = LCD_option; // 0x47
+ cmd[2] = LCD_col; // Valid = 1 - 16
+ cmd[3] = LCD_row; // Valid = 1 - 2
+ LCD.write(LCD_address, cmd, 4); // Send command elements
+}
+//
+//************************************************************************
+// LCD Write First Row Init Function
+//************************************************************************
+void LCD_First_Row(int LCD_address)
+{
+ char letters[17];
+ letters[0] = 'D';
+ letters[1] = 'i';
+ letters[2] = 's';
+ letters[3] = 'p';
+ letters[4] = 'l';
+ letters[5] = 'a';
+ letters[6] = 'y';
+ letters[7] = '.';
+ letters[8] = '.';
+ letters[9] = '.';
+ letters[10] = '.';
+ letters[11] = ' ';
+ letters[12] = 'R';
+ letters[13] = 'e';
+ letters[14] = 'a';
+ letters[15] = 'd';
+ letters[16] = 'y';
+ LCD.write(LCD_address, letters, 17); // Send data elements
+}
+//
+//************************************************************************
+// LCD Write Second Row Init Function
+//************************************************************************
+void LCD_Second_Row(int LCD_address)
+{
+ char letters[17];
+ letters[0] = 'R';
+ letters[1] = 'F';
+ letters[2] = 'I';
+ letters[3] = 'D';
+ letters[4] = ' ';
+ letters[5] = 'M';
+ letters[6] = 'o';
+ letters[7] = 'd';
+ letters[8] = 'u';
+ letters[9] = 'l';
+ letters[10] = 'e';
+ letters[11] = ' ';
+ letters[12] = 'R';
+ letters[13] = 'e';
+ letters[14] = 'a';
+ letters[15] = 'd';
+ letters[16] = 'y';
+ LCD.write(LCD_address, letters, 17); // Send data elements
+}
+//
+//************************************************************************
+// LCD Write First Row2 Init Function
+//************************************************************************
+void LCD_First2_Row(int LCD_address)
+{
+ char letters[17];
+ letters[0] = 'S';
+ letters[1] = 'c';
+ letters[2] = 'a';
+ letters[3] = 'n';
+ letters[4] = ' ';
+ letters[5] = 'T';
+ letters[6] = 'a';
+ letters[7] = 'g';
+ letters[8] = '.';
+ letters[9] = '.';
+ letters[10] = '.';
+ letters[11] = '.';
+ letters[12] = '.';
+ letters[13] = '.';
+ letters[14] = '.';
+ letters[15] = '.';
+ letters[16] = ' ';
+ LCD.write(LCD_address, letters, 17); // Send data elements
+}
+//
+//************************************************************************
+// LCD Write Second2 Row Init Function
+//************************************************************************
+void LCD_Blank_Row(int LCD_address)
+{
+ char letters[17];
+ letters[0] = 0x20; //
+ letters[1] = 0x20; //
+ letters[2] = 0x20; //
+ letters[3] = 0x20; //
+ letters[4] = 0x20; //
+ letters[5] = 0x20; //
+ letters[6] = 0x20; //
+ letters[7] = 0x20; //
+ letters[8] = 0x20; //
+ letters[9] = 0x20; //
+ letters[10] = 0x20; //
+ letters[11] = 0x20; //
+ letters[12] = 0x20; //
+ letters[13] = 0x20; //
+ letters[14] = 0x20; //
+ letters[15] = 0x20; //
+ letters[16] = 0x20; //
+ LCD.write(LCD_address, letters, 17); // Send data elements
+}
+void setup()
+{
+ led1 = 1;
+}
+//
+//**************************************************************************************
+//* Read RFID Tag *
+//**************************************************************************************
+//* *
+//**************************************************************************************
+//* This code is from the book Practical Arduino by Jonathon Oxer and Hugh Blemings *
+//* Other than as noted, I have reproduced it as written and with the authors *
+//* comments and explanations. *
+//**************************************************************************************
+void loop()
+{
+ pc.baud(9600);
+ RFID.baud(9600);
+ int val = 0; // this should hold the character read from the reader
+ int checksum = 0; // this is checked against a calculated checksum
+ int bytesRead = 0; // counter if number of bytes read (2 characters per)
+ int tempByte = 0; // storage for character retreived
+ int tagBytes[6]; // or 12 characters. 5 bytes is tag value 1 is for checksum
+ char tagValue[11]; // the actual tag information +1 for adding null at string end
+ led2=1;
+ LCD_clear_screen(LCD_command, LCD_option);
+ wait(1);
+ LCD_First_Row(LCD_address);
+ LCD_col = 1;
+ LCD_row = 2;
+ LCD_cursor_position(LCD_command, LCD_option, LCD_col, LCD_row);
+ wait(0.5);
+ pc.printf("RFID Module Ready \n\r");
+ wait(0.5);
+ LCD_Second_Row(LCD_address);
+ wait(2);
+ LCD_clear_screen(LCD_command, LCD_option);
+ wait(1);
+ LCD_First2_Row(LCD_address);
+ wait(0.5);
+ while(1)
+ {
+ if (RFID.readable())
+ {
+ val = RFID.getc();
+ if (val == 2)
+ {
+ bytesRead = 0;
+ for (bytesRead = 0; bytesRead < 12; bytesRead++)
+ {
+ val = RFID.getc();
+ if ((val == 0x0D) || (val == 0x0A) || (val == 0x03) || (val == 0x02))
+ {
+ break;
+ }
+ if (bytesRead < 10)
+ {
+ tagValue[bytesRead] = val;
+ }
+ if ((val >= '0') && (val <= '9'))
+ {
+ val = val - '0';
+ }
+ else if ((val >= 'A') && (val <= 'F'))
+ {
+ val = 10 + val - 'A';
+ }
+ if (bytesRead & 1 == 1)
+ {
+ tagBytes[bytesRead >> 1] = (val | (tempByte << 4));
+// It then checks if it has reached the checksum byte, and if so calculates the checksum
+ if (bytesRead >> 1 != 5)
+ {
+ checksum ^= tagBytes[bytesRead >> 1];
+ };
+// This part of the code then deals with the first of a pair of hex digits by simply
+// putting the value directly into a variable. This value will then be shifted 4 bits to
+// the left on the next loop through by the code above.
+ }
+ else
+ {
+ tempByte = val;
+ };
+// The program them increments the counter that tracks how many bytes have been read and
+// reaches the end of the loop, going back to the start to check if it has finished reading
+// all the digits yet.
+ }
+// The program checks if 12 bytes have been read, indicating that it has a complete read and
+// can move on to comparing the acquired value with its list of authorized tags.
+ if (bytesRead == 12)
+ {
+ pc.printf("Tag Value: %s\n\r", tagValue);
+ LCD_col = 1;
+ LCD_row = 2;
+ LCD_cursor_position(LCD_command, LCD_option, LCD_col, LCD_row);
+ wait(0.5);
+ LCD.write(LCD_address, tagValue, 10);
+ }
+ }
+ }
+ }
+ }
+//
+int main()
+{//a->
+ pc.printf("mbed Serial Terminal \n\r");
+ setup();
+ while (1)
+ {
+ loop();
+ }
+}//a<-