maschinenlock/T11_RFID_Tutorial_Sketch/functions.ino

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2016-10-31 09:34:20 +00:00
// this function ready the Display Buttons (analog pin)
// the values from analogRead are due tu a Voltage Divider
inline byte readButtons() {
int c = analogRead(BTN_PIN);
if(c > 1000) {
return 0;
} else if(c < 650 && c > 630) {
return 1; // select
} else if(c < 420 && c > 370) {
return 2; // left
} else if(c < 280 && c > 200) {
return 3; // down
}
return 4; // up
}
// switch the output Relaid on/off
void set_output(boolean on) {
if(on) {
digitalWrite(A4, LOW);
} else {
digitalWrite(A4, HIGH);
}
outputOn = on;
}
// switch the LDC Backlight on/off
void lcd_backlight(boolean on) {
if(on) {
digitalWrite(LCD_BACKLIGHT, HIGH);
} else {
digitalWrite(LCD_BACKLIGHT, LOW);
}
}
// print a Mifare UID at current LDC position
void lcd_print_uid(MFRC522::Uid *uid) {
for (byte i=0; i < uid->size; i++) {
lcd.print(uid->uidByte[i] < 0x10 ? " 0" : " ");
lcd.print(uid->uidByte[i], HEX);
}
}
// gives index of stored card uid if any, otherwise -1
int check_uid(MFRC522::Uid *uid) {
MFRC522::Uid uid2;
for(byte i=0; i < 1+EEP_CLIENT_MAX; i++) {
uid2 = get_uid(i, EEP_ADDR_START);
if(compare_uids(uid, &uid2)) {
return i;
}
}
return -1;
}
boolean compare_uids(MFRC522::Uid *uid1, MFRC522::Uid *uid2) {
if(uid1->size != uid2->size) {
return false;
}
for(byte j=0;j<uid1->size;j++) {
if(uid1->uidByte[j] != uid2->uidByte[j]) {
return false;
}
}
return true;
}
// get a uid from EEPROM at given index + start Address
MFRC522::Uid get_uid(byte index, int startAddress) {
MFRC522::Uid uid;
int address = startAddress + index * EEP_ADDR_UID_INCREMENT;
uid.size = 0;
EEPROM.get(address, uid);
return uid;
}
// delete a UID at the given index + start Address
void delete_uid(int index, int startAddress) {
int address = startAddress + index * EEP_ADDR_UID_INCREMENT;
for(byte i=0; i < EEP_ADDR_UID_INCREMENT; i++) {
EEPROM.write(address+i, 0);
}
}
// store the master UID at first address of EEPROM
void save_master_uid(MFRC522::Uid *uid) {
EEPROM.put(EEP_ADDR_START, *uid);
}
boolean save_client_uid(MFRC522::Uid *uid) {
byte index = EEP_CLIENT_MAX;
// try to find a free slot in EEPROM
for(byte i=0; i<EEP_CLIENT_MAX; i++) {
// we rely on the fact that uid.size is the first byte of the struct, so we can scan faster
byte value = EEPROM.read(EEP_ADDR_START + (i+1)*EEP_ADDR_UID_INCREMENT);
// a empty slot is found if size is 0 or 0xff which is EEPROM default value
if(value == 0 || value == 0xff) {
index = i;
break;
}
}
if(index == EEP_CLIENT_MAX) {
return false;
}
// address is START + Master Slot + Index*Increment
int address = EEP_ADDR_START + EEP_ADDR_UID_INCREMENT + index * EEP_ADDR_UID_INCREMENT;
EEPROM.put(address, *uid);
return true;
}
void add_log(MFRC522::Uid *uid) {
MFRC522::Uid temp;
//TODO: rather than moving the log every time around, we could
// use a pointer the the start index and just increment this and append
// the log a position startindex-1 und decrement the index
// move all entries one back
for(byte i=EEP_ADDR_LOG_LENGTH - 1; i> 0; i--) {
temp.size = 0;
EEPROM.get(EEP_ADDR_LOG_START + (i - 1) * EEP_ADDR_UID_INCREMENT, temp);
if(temp.size != 0 && temp.size != 255) {
EEPROM.put(EEP_ADDR_LOG_START + i * EEP_ADDR_UID_INCREMENT, temp);
}
}
EEPROM.put(EEP_ADDR_LOG_START, *uid);
}
// a debug function for showing all UID from EEPROM over Serial
void dump_uid(byte count, int address) {
MFRC522::Uid uid;
for(byte i=0; i< count; i++) {
uid = get_uid(i, address);
Serial.print("slot ");
if(i < 10) Serial.print(" ");
Serial.print(i);
Serial.print(":");
for (byte j=0;j<10;j++) {
Serial.print(uid.uidByte[j] < 0x10 ? " 0" : " ");
Serial.print(uid.uidByte[j], HEX);
}
Serial.println(" ");
}
}