I’m almost done with the code which will support both hardware and software SPI modes. I won’t be able to troubleshoot since I don’t have a module but I’s always here to provide support. I should have the code up on my github later today. 
Done! The RC522_RFID code can be found on my github. The software SPI has been tested in the microSD library. Read the notes in the files and enjoy. Let me know how it works!
just build it 
seems i don’t get it to work…
what i’ve done;
i’ve replace the serial with lcd.print
i’ve uncommented the rfid.h portion where we need the software SPI
i’ve changed the ports
this is my code:
/*
* HARDWARE AND SOFTWARE LIQUIDCRYSTAL SPI
* 74HC595 LIBRARY FOR SPARK CORE
* =======================================================
* Copy this into a new application at:
* https://www.spark.io/build and go nuts!
* !! Pinouts and diagrams on line 624 below !!
* -------------------------------------------------------
* Author: BDub
* Website: http://technobly.com
* Date: Feb 6th 2014
* =======================================================
* https://github.com/technobly/SparkCore-LiquidCrystalSPI
*/
/* ========================= INCLUDES ============================== */
#include <application.h>
#include "RFID.h"
/* ========= Arduino.h ========== */
#define bitSet(value, bit) ((value) |= (1UL << (bit)))
#define bitClear(value, bit) ((value) &= ~(1UL << (bit)))
#define bitWrite(value, bit, bitvalue) (bitvalue ? bitSet(value, bit) : bitClear(value, bit))
/* ========= LiquidCrystalSPI.h ========== */
// commands
#define LCD_CLEARDISPLAY 0x01
#define LCD_RETURNHOME 0x02
#define LCD_ENTRYMODESET 0x04
#define LCD_DISPLAYCONTROL 0x08
#define LCD_CURSORSHIFT 0x10
#define LCD_FUNCTIONSET 0x20
#define LCD_SETCGRAMADDR 0x40
#define LCD_SETDDRAMADDR 0x80
// flags for display entry mode
#define LCD_ENTRYRIGHT 0x00
#define LCD_ENTRYLEFT 0x02
#define LCD_ENTRYSHIFTINCREMENT 0x01
#define LCD_ENTRYSHIFTDECREMENT 0x00
// flags for display on/off control
#define LCD_DISPLAYON 0x04
#define LCD_DISPLAYOFF 0x00
#define LCD_CURSORON 0x02
#define LCD_CURSOROFF 0x00
#define LCD_BLINKON 0x01
#define LCD_BLINKOFF 0x00
// flags for display/cursor shift
#define LCD_DISPLAYMOVE 0x08
#define LCD_CURSORMOVE 0x00
#define LCD_MOVERIGHT 0x04
#define LCD_MOVELEFT 0x00
// flags for function set
#define LCD_8BITMODE 0x10
#define LCD_4BITMODE 0x00
#define LCD_2LINE 0x08
#define LCD_1LINE 0x00
#define LCD_5x10DOTS 0x04
#define LCD_5x8DOTS 0x00
class LiquidCrystal : public Print {
public:
LiquidCrystal(uint8_t rs, uint8_t enable,
uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7);
LiquidCrystal(uint8_t rs, uint8_t rw, uint8_t enable,
uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7);
LiquidCrystal(uint8_t rs, uint8_t rw, uint8_t enable,
uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3);
LiquidCrystal(uint8_t rs, uint8_t enable,
uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3);
LiquidCrystal(uint8_t ss, uint8_t sclk, uint8_t sdat); //SPI to ShiftRegister 74HC595 ##########
void initSPI(void); //SPI ##################################
void init(uint8_t fourbitmode, uint8_t rs, uint8_t rw, uint8_t enable,
uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7, uint8_t backlight);
void begin(uint8_t cols, uint8_t rows, uint8_t charsize = LCD_5x8DOTS);
void clear();
void home();
void noDisplay();
void display();
void noBlink();
void blink();
void noCursor();
void cursor();
void scrollDisplayLeft();
void scrollDisplayRight();
void leftToRight();
void rightToLeft();
void autoscroll();
void noAutoscroll();
void backlight();
void noBacklight();
void createChar(uint8_t, uint8_t[]);
void setCursor(uint8_t, uint8_t);
virtual size_t write(uint8_t);
void command(uint8_t);
private:
void send(uint8_t, uint8_t);
void spiSendOut(); // SPI ###########################################
void write4bits(uint8_t);
void write8bits(uint8_t);
void pulseEnable();
void writeSlow(uint8_t);
void writeFast(uint8_t);
uint8_t _rs_pin; // LOW: command. HIGH: character.
uint8_t _rw_pin; // LOW: write to LCD. HIGH: read from LCD.
uint8_t _enable_pin; // activated by a HIGH pulse.
uint8_t _backlight_pin; // activated by a HIGH pulse (adafruit SPI/I2C LCD Backpack only)
uint8_t _data_pins[8];
//SPI #####################################################################
uint8_t _backlight; // 1 = backlight on, 0 = backlight off
uint8_t _bitString; //for SPI bit0=not used, bit1=RS, bit2=RW, bit3=Enable, bits4-7 = DB4-7
bool _usingSpi; //to let send and write functions know we are using SPI
bool _softSpi; //to let send and write functions know we are using SPI
uint8_t _latchPin;
uint8_t _sclkPin;
uint8_t _sdatPin;
uint8_t _clockDivider;
uint8_t _dataMode;
uint8_t _bitOrder;//SPI ####################################################
uint8_t _displayfunction;
uint8_t _displaycontrol;
uint8_t _displaymode;
uint8_t _initialized;
uint8_t _numlines,_currline;
};
/* ========= LiquidCrystalSPI.cpp ========== */
// When the display powers up, it is configured as follows:
//
// 1. Display clear
// 2. Function set:
// DL = 1; 8-bit interface data
// N = 0; 1-line display
// F = 0; 5x8 dot character font
// 3. Display on/off control:
// D = 0; Display off
// C = 0; Cursor off
// B = 0; Blinking off
// 4. Entry mode set:
// I/D = 1; Increment by 1
// S = 0; No shift
//
// Note, however, that resetting the Arduino doesn't reset the LCD, so we
// can't assume that its in that state when a sketch starts (and the
// LiquidCrystal constructor is called).
LiquidCrystal::LiquidCrystal(uint8_t rs, uint8_t rw, uint8_t enable,
uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7)
{
init(0, rs, rw, enable, d0, d1, d2, d3, d4, d5, d6, d7, 255);
}
LiquidCrystal::LiquidCrystal(uint8_t rs, uint8_t enable,
uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7)
{
init(0, rs, 255, enable, d0, d1, d2, d3, d4, d5, d6, d7, 255);
}
LiquidCrystal::LiquidCrystal(uint8_t rs, uint8_t rw, uint8_t enable,
uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3)
{
init(1, rs, rw, enable, d0, d1, d2, d3, 0, 0, 0, 0, 255);
}
LiquidCrystal::LiquidCrystal(uint8_t rs, uint8_t enable,
uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3)
{
init(1, rs, 255, enable, d0, d1, d2, d3, 0, 0, 0, 0, 255);
}
LiquidCrystal::LiquidCrystal(uint8_t ss, uint8_t sclk=255, uint8_t sdat=255) //SPI ##############################
{
_latchPin = ss;
_softSpi = false; // assume we are using hardware SPI
if(sclk != 255 && sdat != 255) {
_softSpi = true; // on second thought, let's use software SPI
}
_sclkPin = sclk;
_sdatPin = sdat;
/*
initSPI(ssPin);
//shiftRegister pins 1,2,3,4,5,6,7 represent rs, rw, enable, d4-7 in that order
//but we are not using RW so RW it's zero or 255
init(1, 1, 255, 3, 0, 0, 0, 0, 4, 5, 6, 7, 255);
*/
}
void LiquidCrystal::initSPI(void) //SPI ##########################################
{
// initialize SPI:
_usingSpi = true;
pinMode (_latchPin, OUTPUT); // setup _latchPin used in hardware and software SPI
digitalWrite(_latchPin, HIGH);
// If we're using software SPI, setup the clock and data pins.
if(_softSpi) {
pinMode(_sclkPin, OUTPUT);
pinMode(_sdatPin, OUTPUT);
digitalWrite(_sclkPin, LOW);
digitalWrite(_sdatPin, LOW);
}
else { // Else set up the hardware SPI
SPI.begin();
//_clockDivider = SPI_CLOCK_DIV4; // 72MHz / 4 = 18MHz (works but takes just as long as 9MHz)
_clockDivider = SPI_CLOCK_DIV8; // 72MHz / 8 = 9MHz (Really is about twice as fast as 4.5MHz)
//_clockDivider = SPI_CLOCK_DIV16; // 72MHz / 16 = 4.5MHz
SPI.setClockDivider(_clockDivider);
// FYI: Software SPI is about the same speed as SPI_CLOCK_DIV8 ! :)
// Set data mode to SPI_MODE0 by default
_dataMode = SPI_MODE0;
SPI.setDataMode(_dataMode);
// Set bitOrder to MSBFIRST by default
_bitOrder = MSBFIRST;
SPI.setBitOrder(_bitOrder);
}
// Adafruit SPI/I2C LCD Backpack or Discrete hookup to 74HC595
// pins represent: fourbitmode, rs, rw, enable, d0, d1, d2, d3, d4, d5, d6, d7, backlight
init(1, 1, 255, 2, 0, 0, 0, 0, 6, 5, 4, 3, 7);
}
void LiquidCrystal::init(uint8_t fourbitmode, uint8_t rs, uint8_t rw, uint8_t enable,
uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7, uint8_t backlight)
{
_rs_pin = rs;
_rw_pin = rw;
_enable_pin = enable;
_backlight_pin = backlight;
_backlight = 0; // off by default
_data_pins[0] = d0;
_data_pins[1] = d1;
_data_pins[2] = d2;
_data_pins[3] = d3;
_data_pins[4] = d4;
_data_pins[5] = d5;
_data_pins[6] = d6;
_data_pins[7] = d7;
pinMode(_rs_pin, OUTPUT);
// we can save 1 pin by not using RW. Indicate by passing 255 instead of pin#
if (_rw_pin != 255) {
pinMode(_rw_pin, OUTPUT);
}
pinMode(_enable_pin, OUTPUT);
if (fourbitmode)
_displayfunction = LCD_4BITMODE | LCD_1LINE | LCD_5x8DOTS;
else
_displayfunction = LCD_8BITMODE | LCD_1LINE | LCD_5x8DOTS;
//begin(16, 2); // commented out, make sure you call this in code!
//since in initSPI constructor we set _usingSPI to true and we run it first
//from SPI constructor, we do nothing here otherwise we set it to false
if (_usingSpi) //SPI ######################################################
{
;
}
else
{
_usingSpi = false;
}
}
void LiquidCrystal::begin(uint8_t cols, uint8_t lines, uint8_t dotsize) {
if (lines > 1) {
_displayfunction |= LCD_2LINE;
}
_numlines = lines;
_currline = 0;
// for some 1 line displays you can select a 10 pixel high font
if ((dotsize != 0) && (lines == 1)) {
_displayfunction |= LCD_5x10DOTS;
}
// SEE PAGE 45/46 FOR INITIALIZATION SPECIFICATION!
// according to datasheet, we need at least 40ms after power rises above 2.7V
// before sending commands. Arduino can turn on way befer 4.5V so we'll wait 50
delayMicroseconds(50000);
// Now we pull both RS and R/W low to begin commands
digitalWrite(_rs_pin, LOW);
digitalWrite(_enable_pin, LOW);
if (_rw_pin != 255) {
digitalWrite(_rw_pin, LOW);
}
//put the LCD into 4 bit or 8 bit mode
if (! (_displayfunction & LCD_8BITMODE)) {
// this is according to the hitachi HD44780 datasheet
// figure 24, pg 46
// we start in 8bit mode, try to set 4 bit mode
write4bits(0x03);
delayMicroseconds(4500); // wait min 4.1ms
// second try
write4bits(0x03);
delayMicroseconds(4500); // wait min 4.1ms
// third go!
write4bits(0x03);
delayMicroseconds(150);
// finally, set to 4-bit interface
write4bits(0x02);
} else {
// this is according to the hitachi HD44780 datasheet
// page 45 figure 23
// Send function set command sequence
command(LCD_FUNCTIONSET | _displayfunction);
delayMicroseconds(4500); // wait more than 4.1ms
// second try
command(LCD_FUNCTIONSET | _displayfunction);
delayMicroseconds(150);
// third go
command(LCD_FUNCTIONSET | _displayfunction);
}
// finally, set # lines, font size, etc.
command(LCD_FUNCTIONSET | _displayfunction);
// turn the display on with no cursor or blinking default
_displaycontrol = LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKOFF;
display();
// clear it off
clear();
// Initialize to default text direction (for romance languages)
_displaymode = LCD_ENTRYLEFT | LCD_ENTRYSHIFTDECREMENT;
// set the entry mode
command(LCD_ENTRYMODESET | _displaymode);
}
/********** high level commands, for the user! */
void LiquidCrystal::clear()
{
command(LCD_CLEARDISPLAY); // clear display, set cursor position to zero
delayMicroseconds(2000); // this command takes a long time!
}
void LiquidCrystal::home()
{
command(LCD_RETURNHOME); // set cursor position to zero
delayMicroseconds(2000); // this command takes a long time!
}
void LiquidCrystal::setCursor(uint8_t col, uint8_t row)
{
int row_offsets[] = { 0x00, 0x40, 0x14, 0x54 };
if ( row > _numlines ) {
row = _numlines-1; // we count rows starting w/0
}
command(LCD_SETDDRAMADDR | (col + row_offsets[row]));
}
// Turn the display on/off (quickly)
void LiquidCrystal::noDisplay() {
_displaycontrol &= ~LCD_DISPLAYON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
void LiquidCrystal::display() {
_displaycontrol |= LCD_DISPLAYON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
// Turns the underline cursor on/off
void LiquidCrystal::noCursor() {
_displaycontrol &= ~LCD_CURSORON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
void LiquidCrystal::cursor() {
_displaycontrol |= LCD_CURSORON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
// Turn on and off the blinking cursor
void LiquidCrystal::noBlink() {
_displaycontrol &= ~LCD_BLINKON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
void LiquidCrystal::blink() {
_displaycontrol |= LCD_BLINKON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
// These commands scroll the display without changing the RAM
void LiquidCrystal::scrollDisplayLeft(void) {
command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVELEFT);
}
void LiquidCrystal::scrollDisplayRight(void) {
command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVERIGHT);
}
// This is for text that flows Left to Right
void LiquidCrystal::leftToRight(void) {
_displaymode |= LCD_ENTRYLEFT;
command(LCD_ENTRYMODESET | _displaymode);
}
// This is for text that flows Right to Left
void LiquidCrystal::rightToLeft(void) {
_displaymode &= ~LCD_ENTRYLEFT;
command(LCD_ENTRYMODESET | _displaymode);
}
// This will 'right justify' text from the cursor
void LiquidCrystal::autoscroll(void) {
_displaymode |= LCD_ENTRYSHIFTINCREMENT;
command(LCD_ENTRYMODESET | _displaymode);
}
// This will 'left justify' text from the cursor
void LiquidCrystal::noAutoscroll(void) {
_displaymode &= ~LCD_ENTRYSHIFTINCREMENT;
command(LCD_ENTRYMODESET | _displaymode);
}
// Allows us to fill the first 8 CGRAM locations
// with custom characters
void LiquidCrystal::createChar(uint8_t location, uint8_t charmap[]) {
location &= 0x7; // we only have 8 locations 0-7
command(LCD_SETCGRAMADDR | (location << 3));
for (int i=0; i<8; i++) {
write(charmap[i]);
}
}
// Turn the backlight on/off
// Backlight will turn on or off immediately
void LiquidCrystal::backlight(void) {
_backlight = 1;
// add the backlight bit on all transfers
bitWrite(_bitString, _backlight_pin, 1);
// and send it out
spiSendOut();
}
void LiquidCrystal::noBacklight(void) {
_backlight = 0;
// add the backlight bit on all transfers
bitWrite(_bitString, _backlight_pin, 0);
// and send it out
spiSendOut();
}
/*********** mid level commands, for sending data/cmds */
inline void LiquidCrystal::command(uint8_t value) {
send(value, LOW);
}
inline size_t LiquidCrystal::write(uint8_t value) {
send(value, HIGH);
return 1; // assume sucess
}
/************ low level data pushing commands **********/
// write either command or data, with automatic 4/8-bit selection
void LiquidCrystal::send(uint8_t value, uint8_t mode) {
if (_usingSpi == false)
{
digitalWrite(_rs_pin, mode);
// if there is a RW pin indicated, set it low to Write
if (_rw_pin != 255) {
digitalWrite(_rw_pin, LOW);
}
if (_displayfunction & LCD_8BITMODE) {
write8bits(value);
} else {
write4bits(value>>4);
write4bits(value);
}
}
else //we use SPI ##########################################
{
bitWrite(_bitString, _rs_pin, mode); //set RS to mode
spiSendOut();
// we are not using RW with SPI so we are not even bothering
// or 8BITMODE so we go straight to write4bits
write4bits(value>>4);
write4bits(value);
}
}
void LiquidCrystal::pulseEnable(void) {
if (_usingSpi == false)
{
digitalWrite(_enable_pin, LOW);
delayMicroseconds(1);
digitalWrite(_enable_pin, HIGH);
delayMicroseconds(1); // enable pulse must be >450ns
digitalWrite(_enable_pin, LOW);
delayMicroseconds(100); // commands need > 37us to settle
}
else //we use SPI #############################################
{
bitWrite(_bitString, _enable_pin, LOW);
spiSendOut();
delayMicroseconds(1);
bitWrite(_bitString, _enable_pin, HIGH);
spiSendOut();
delayMicroseconds(1); // enable pulse must be >450ns
bitWrite(_bitString, _enable_pin, LOW);
spiSendOut();
delayMicroseconds(40); // commands need > 37us to settle
}
}
void LiquidCrystal::write4bits(uint8_t value) {
if (_usingSpi == false)
{
for (int i = 0; i < 4; i++) {
pinMode(_data_pins[i], OUTPUT);
digitalWrite(_data_pins[i], (value >> i) & 0x01);
}
}
else //we use SPI ##############################################
{
for (int i = 4; i < 8; i++) {
//we put the four bits into the _bitString
bitWrite(_bitString, _data_pins[i], ((value >> (i - 4)) & 0x01));
}
// add the backlight bit on all transfers
bitWrite(_bitString, _backlight_pin, (_backlight & 0x01));
// and send it out
spiSendOut();
}
pulseEnable();
}
void LiquidCrystal::write8bits(uint8_t value) {
for (int i = 0; i < 8; i++) {
pinMode(_data_pins[i], OUTPUT);
digitalWrite(_data_pins[i], (value >> i) & 0x01);
}
pulseEnable();
}
void LiquidCrystal::spiSendOut() //SPI #############################
{
if(_softSpi) {
writeFast(_bitString);
}
else {
digitalWrite(_latchPin, LOW);
SPI.transfer(_bitString);
digitalWrite(_latchPin, HIGH);
}
}
void LiquidCrystal::writeSlow(uint8_t value) {
digitalWrite(_latchPin, LOW);
shiftOut(_sdatPin, _sclkPin, MSBFIRST, value);
digitalWrite(_latchPin, HIGH);
}
inline void LiquidCrystal::writeFast(uint8_t value) {
PIN_MAP[_latchPin].gpio_peripheral->BRR = PIN_MAP[_latchPin].gpio_pin; // Latch Low
for (uint8_t i = 0; i < 8; i++) {
if (value & (1 << (7-i))) { // walks down mask from bit 7 to bit 0
PIN_MAP[_sdatPin].gpio_peripheral->BSRR = PIN_MAP[_sdatPin].gpio_pin; // Data High
}
else {
PIN_MAP[_sdatPin].gpio_peripheral->BRR = PIN_MAP[_sdatPin].gpio_pin; // Data Low
}
asm volatile("mov r0, r0" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" ::: "r0", "cc", "memory");
PIN_MAP[_sclkPin].gpio_peripheral->BSRR = PIN_MAP[_sclkPin].gpio_pin; // Clock High (Data Shifted In)
asm volatile("mov r0, r0" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" ::: "r0", "cc", "memory");
PIN_MAP[_sclkPin].gpio_peripheral->BRR = PIN_MAP[_sclkPin].gpio_pin; // Clock Low
}
asm volatile("mov r0, r0" "\n\t" "nop" "\n\t" "nop" "\n\t" "nop" "\n\t" ::: "r0", "cc", "memory");
PIN_MAP[_latchPin].gpio_peripheral->BSRR = PIN_MAP[_latchPin].gpio_pin; // Latch High (Data Latched)
}
/* ========= Application.cpp ========== */
/*
LiquidCrystal SPI Library - Hello, Sparky!
This is the same library that comes with Arduino for LCDs.
There is added support for hardware and software SPI.
Assumes you are using a 74HC595 shift register.
SPARK CORE HARDWARE SPI PINOUTS
( SS, SCLK and SDAT can be whatever you want for SOFTWARE SPI,
but must define all three in Class constructor,
see below for commented out example )
http://docs.spark.io/#/firmware/communication-spi
=========================================================
Spark Core 74HC595
A5 (MOSI) 14 - The DATA pin for incoming serial data.
A3 (SCK) 11 - The CLOCK pin for the DATA bits.
A2 (SS) 12 - The LATCH pin, latches data to 595 outputs.
GND 8 - Ground pin
GND 13 - Output enable pin (enable)
VIN 16 - VCC power pin
VIN 10 - Serial clear pin (disable)
LCD CONN. 74HC595
RS (typ. 4) 1 - QB pin
E (typ. 6) 2 - QC pin
D7 (typ. 14) 3 - QD pin
D6 (typ. 13) 4 - QE pin
D5 (typ. 12) 5 - QF pin
D4 (typ. 11) 6 - QG pin
LITE (*) 7 - QH pin
RW (typ. 5) 8 - Ground for always Write mode
LCD CONN. 10K CONTRAST POT
VCC (typ. 2) 1 - HIGH
CTRST (typ. 3) 2 - WIPER
GND (typ. 1) 3 - LOW
* see Adafruit I2C/SPI BACKPACK schematic for backlight circuit suggestion:
https://raw2.github.com/adafruit/i2c-SPI-LCD-backpack/master/i2cspilcdbackpacksch.png
See this Fritzing diagram for a visual guide to the above connections
http://i.imgur.com/pFFWmv9.png
=========================================================
Spark Core Adafruit I2C/SPI BACKPACK http://www.adafruit.com/products/292
A5 (MOSI) DAT - The DATA pin for incoming serial data.
A3 (SCK) CLK - The CLOCK pin for the DATA bits.
A2 (SS) LAT - The LATCH pin, latches data to 595 outputs.
VIN 5V - The power pin
GND GND - The ground pin
NOTES: Make sure SPI solder jumper is shorted!
=========================================================
Library originally added 18 Apr 2008
by David A. Mellis
library modified 5 Jul 2009
by Limor Fried (http://www.ladyada.net)
example added 9 Jul 2009
by Tom Igoe
modified 22 Nov 2010
by Tom Igoe
modified 12 Feb 2012
by Juan Hernandez
modified to work for Spark Core (HW & SW SPI) 6 Feb 2014
by BDub (http://www.technobly.com)
This example code is in the public domain.
http://www.arduino.cc/en/Tutorial/LiquidCrystal
*/
// Create an instance of the library for SOFTWARE SPI mode (define SS "latch" pin, SCLK pin, SDAT pin)
// These can be ANY of the A0 - A7 or D0 - D7 pins.
// Just make sure you don't redefine them as some other peripheral later in your code.
LiquidCrystal lcd(D0, D1, D2);
/* FILE: RC522_RFID_Module_Example
DATE: 23/03/14
VERSION: 0.2 Spark
REVISIONS:
23/03/14 Version 0.2, modified by Paul Kourany to run on Spark Core
with added support for Software SPI
24/07/13 Created version 0.1
This is an example of how to use the RC522 RFID module. The module allows reading
and writing to various types of RFID devices and can be found in our MFRC-522
(HCMODU0016) and Ultimate RFID (HCARDU0068) kits. This example Arduino sketch uses
the RFID library written by Miguel Balboa to read the pre-programmed serial number
from RFID cards and tags supplied with our RFID kits. Snapshots and links to the
library are available on our support forum.
PINOUT:
RC522 MODULE SPARK HARD SPI SPARK SOFT SPI
SS A2 A0
SCK A3 A1
MOSI A5 A2
MISO A4 A3
IRQ N/A N/A
GND GND GND
RST D9 A4
3.3V 3.3V 3.3V
You may copy, alter and reuse this code in any way you like, but please leave
reference to HobbyComponents.com in your comments if you redistribute this code.
This software may not be used directly for the purpose of selling products that
directly compete with Hobby Components Ltd's own range of products.
THIS SOFTWARE IS PROVIDED "AS IS". HOBBY COMPONENTS MAKES NO WARRANTIES, WHETHER
EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ACCURACY OR LACK OF NEGLIGENCE.
HOBBY COMPONENTS SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR ANY DAMAGES,
INCLUDING, BUT NOT LIMITED TO, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES FOR ANY
REASON WHATSOEVER.
*/
/* Include the RFID library */
/* SEE RFID.h for selecting Hardware or Software SPI modes */
#include "RFID.h"
/* Define the pins used for the SS (SDA) and RST (reset) pins for BOTH hardware and software SPI */
/* Change as required */
#define SS_PIN A0 // Same pin used as hardware SPI (SS)
#define RST_PIN A4
/* Define the pins used for the DATA OUT (MOSI), DATA IN (MISO) and CLOCK (SCK) pins for SOFTWARE SPI ONLY */
/* Change as required and may be same as hardware SPI as listed in comments */
#define MOSI_PIN A2 // hardware SPI: A5
#define MISO_PIN A3 // " " : A4
#define SCK_PIN A1 // " " : A3
/* Create an instance of the RFID library */
#if defined(_USE_SOFT_SPI)
RFID(int chipSelectPin, int NRSTPD, uint8_t mosiPin, uint8_t misoPin, uint8_t clockPin); // Software SPI
#else
RFID RC522(SS_PIN, RST_PIN); // Hardware SPI
#endif
void setup()
{
/* Enable the SPI interface */
SPI.begin();
/* Initialise the RFID reader */
RC522.init();
// initialize the SPI ( Must call this before begin()! )
lcd.initSPI();
// set up the LCD's number of columns and rows:
lcd.begin(16, 2);
// Print a message to the LCD.
lcd.print("Hier komt RFID");
delay(1000);
}
void loop()
{
/* Temporary loop counter */
byte i;
// set the cursor to column 0, line 1
// (note: line 1 is the second row, since counting begins with 0):
// lcd.setCursor(0, 1);
// print the number of seconds since reset:
// lcd.print(millis()/1000);
// delay(100);
/* Has a card been detected? */
if (RC522.isCard())
{
/* If so then get its serial number */
RC522.readCardSerial();
lcd.setCursor(0, 0);
lcd.print("Card detected:");
/* Output the serial number to the UART */
for(i = 0; i <= 4; i++)
{
lcd.setCursor(0, 1);
lcd.print(RC522.serNum[i],HEX);
lcd.print(" ");
delay(1000);
}
Serial.println();
Serial.println();
}
}
unfortunately, my LCD does not display any cards…
korneel, I am trying to understand why you would want two SPI devices to each run separate software SPI functions on separate pins. Using software SPI here is the wrong approach!
Hardware SPI is designed to be able to support more than one device on the SAME SPI BUS with the condition that each device use different chip select (CS) pins. The only other condition is that the SPI bus speed has to be set for the slowest SPI device.
So, both the LCD and the RC522 can be connected to the hardware SPI pins but one would use the A2 (SS) pin as its CS and the other would use pin D2 as its CS.
Does this make sense and am I understanding your application correctly?
BTW, I just noticed that the way you wrote your program, the RC522 would be using hardware SPI and the LCD would use software SPI though the pins overlap!
korneel, if my understanding is correct, then to make it work, do the following:
- Connect both devices to the hardware SPI pins:
A3=SCK
A4=MISO (only on the RC522 since nothing is read from the LCD)
A5=MOSI - Connect the LCD chip select line to A2 (SS)
- Connect the RC522 chip select line to D0
- Connect the RC522 reset line to D1
- Make the following changes in the code:
LiquidCrystal lcd(SS);
#define SS_PIN D0 // Same pin used as hardware SPI (SS)
#define RST_PIN D1
i guess it all has to do with the fact that i don’t understand SPI i guess. i did not know you could connect multiple devices to the same SPI bus?
how do i know which is the slowest SPI device? is there an easy tutorial for SPI?
korneel, don’t worry about the SPI bus speed since the default value works in most cases. Follow my instructions and let me know how it goes. I suggest you connect each device seperately and test it on the hardware SPI lines before combining the two. That way you are sure they each work properly. Once each is working and combined, things should purr like a kitten.
BTW, for a fun (NOT!) read on SPI, see http://en.wikipedia.org/wiki/Serial_Peripheral_Interface_Bus
thanks for the help!
so i’ve done just that now
unfortunately, i need the LCD to see if something works… and sadly, it doesn’t as far as i can see…
i am using the liquidcrystal.h and .cpp and the rfid.h and .cpp and this is my main code:
// This #include statement was automatically added by the Spark IDE.
#include "RFID.h"
// Create an instance of the library for HARDWARE SPI mode (define SS "latch" pin)
// Default SS pin is A2, but can be ANY of the A0 - A2, A6, A7 or D0 - D7 pins.
// Just make sure you don't redefine this pin as some other peripheral later in your code.
#include "LiquidCrystalSPI.h"
LiquidCrystal lcd(A2);
/* FILE: RC522_RFID_Module_Example
DATE: 23/03/14
VERSION: 0.2 Spark
REVISIONS:
23/03/14 Version 0.2, modified by Paul Kourany to run on Spark Core
with added support for Software SPI
24/07/13 Created version 0.1
This is an example of how to use the RC522 RFID module. The module allows reading
and writing to various types of RFID devices and can be found in our MFRC-522
(HCMODU0016) and Ultimate RFID (HCARDU0068) kits. This example Arduino sketch uses
the RFID library written by Miguel Balboa to read the pre-programmed serial number
from RFID cards and tags supplied with our RFID kits. Snapshots and links to the
library are available on our support forum.
PINOUT:
RC522 MODULE SPARK HARD SPI SPARK SOFT SPI
SS A2 ANY
SCK A3 ANY
MOSI A5 ANY
MISO A4 ANY
IRQ N/A N/A
GND GND GND
RST D9 ANY
3.3V 3.3V 3.3V
You may copy, alter and reuse this code in any way you like, but please leave
reference to HobbyComponents.com in your comments if you redistribute this code.
This software may not be used directly for the purpose of selling products that
directly compete with Hobby Components Ltd's own range of products.
THIS SOFTWARE IS PROVIDED "AS IS". HOBBY COMPONENTS MAKES NO WARRANTIES, WHETHER
EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ACCURACY OR LACK OF NEGLIGENCE.
HOBBY COMPONENTS SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR ANY DAMAGES,
INCLUDING, BUT NOT LIMITED TO, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES FOR ANY
REASON WHATSOEVER.
*/
/* Include the RFID library */
/* SEE RFID.h for selecting Hardware or Software SPI modes */
#include "RFID.h"
/* Define the pins used for the SS (SDA) and RST (reset) pins for BOTH hardware and software SPI */
/* Change as required */
#define SS_PIN D0 // Same pin used as hardware SPI (SS)
#define RST_PIN D1
/* Define the pins used for the DATA OUT (MOSI), DATA IN (MISO) and CLOCK (SCK) pins for SOFTWARE SPI ONLY */
/* Change as required and may be same as hardware SPI as listed in comments */
#define MOSI_PIN A5 // hardware SPI: A5
#define MISO_PIN A4 // " " : A4
#define SCK_PIN A3 // " " : A3
/* Create an instance of the RFID library */
#if defined(_USE_SOFT_SPI)
RFID(int chipSelectPin, int NRSTPD, uint8_t mosiPin, uint8_t misoPin, uint8_t clockPin); // Software SPI
#else
RFID RC522(SS_PIN, RST_PIN); // Hardware SPI
#endif
void setup()
{
Serial.begin(9600);
/* Enable the SPI interface */
SPI.begin();
/* Initialise the RFID reader */
RC522.init();
// initialize the SPI ( Must call this before begin()! )
lcd.initSPI();
// set up the LCD's number of columns and rows:
lcd.begin(16, 2);
// Print a message to the LCD.
lcd.print("Hier komt RFID");
delay(2000);
}
void loop()
{
// set the cursor to column 0, line 1
// (note: line 1 is the second row, since counting begins with 0):
delay(100);
/* Temporary loop counter */
byte i;
/* Has a card been detected? */
if (RC522.isCard())
{
/* If so then get its serial number */
RC522.readCardSerial();
lcd.setCursor(0, 0);
lcd.print("RFID Card detected:");
/* Output the serial number to the UART */
for(i = 0; i <= 4; i++)
{
lcd.setCursor(0, 1);
lcd.print(RC522.serNum[i],HEX);
lcd.print(" ");
}
Serial.println();
Serial.println();
}
}
i have the LCD wired as the hardware liquidcrystal now and that works, i then added the RFID reader and updated the code.
i can also try adding just the RFID reader but then i need tos tart the whole serial process…
can you spot any mistake?
korneel, if I understand correctly, the LCD is working and displaying stuff. Great! So, looking at your code, here is what I see:
- You have two #include “RFID.h” lines. Get rid of the first one at the top
- You don’t need SPI.begin() in setup() since that’s done elsewhere
- Make sure you RC522 RST and SS pins are correctly connected to pins D0 and D1 on the Spark
- Put back the original Serial.print() debugging lines so you can see what’s happening and disconnect the LCD just to test the RC522
so, feedback from my side
- you are correct. stupid auto-add. fixed it.
- removed it. this is directly from your code btw…
- i actually took out everything and rebuild everything according to the “clean” code you provided with just the RC522 reader. there is a mistake though in your code, in the reference you reference the reset pin as D9, but in your declarations you use D2. I used D2 as wel for the RST.
- done this.
ok, so my code is now looking like this (based on your github example
/* FILE: RC522_RFID_Module_Example
DATE: 23/03/14
VERSION: 0.2 Spark
REVISIONS:
23/03/14 Version 0.2, modified by Paul Kourany to run on Spark Core
with added support for Software SPI
24/07/13 Created version 0.1
This is an example of how to use the RC522 RFID module. The module allows reading
and writing to various types of RFID devices and can be found in our MFRC-522
(HCMODU0016) and Ultimate RFID (HCARDU0068) kits. This example Arduino sketch uses
the RFID library written by Miguel Balboa to read the pre-programmed serial number
from RFID cards and tags supplied with our RFID kits. Snapshots and links to the
library are available on our support forum.
PINOUT:
RC522 MODULE SPARK HARD SPI SPARK SOFT SPI
SS A2 ANY
SCK A3 ANY
MOSI A5 ANY
MISO A4 ANY
IRQ N/A N/A
GND GND GND
RST D9 ANY
3.3V 3.3V 3.3V
You may copy, alter and reuse this code in any way you like, but please leave
reference to HobbyComponents.com in your comments if you redistribute this code.
This software may not be used directly for the purpose of selling products that
directly compete with Hobby Components Ltd's own range of products.
THIS SOFTWARE IS PROVIDED "AS IS". HOBBY COMPONENTS MAKES NO WARRANTIES, WHETHER
EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ACCURACY OR LACK OF NEGLIGENCE.
HOBBY COMPONENTS SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR ANY DAMAGES,
INCLUDING, BUT NOT LIMITED TO, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES FOR ANY
REASON WHATSOEVER.
*/
/* Include the RFID library */
/* SEE RFID.h for selecting Hardware or Software SPI modes */
#include "RFID.h"
/* Define the pins used for the SS (SDA) and RST (reset) pins for BOTH hardware and software SPI */
/* Change as required */
#define SS_PIN A2 // Same pin used as hardware SPI (SS)
#define RST_PIN D2
/* Define the pins used for the DATA OUT (MOSI), DATA IN (MISO) and CLOCK (SCK) pins for SOFTWARE SPI ONLY */
/* Change as required and may be same as hardware SPI as listed in comments */
#define MOSI_PIN D3 // hardware SPI: A5
#define MISO_PIN D4 // " " : A4
#define SCK_PIN D5 // " " : A3
/* Create an instance of the RFID library */
#if defined(_USE_SOFT_SPI)
RFID(int chipSelectPin, int NRSTPD, uint8_t mosiPin, uint8_t misoPin, uint8_t clockPin); // Software SPI
#else
RFID RC522(SS_PIN, RST_PIN); // Hardware SPI
#endif
void setup()
{
pinMode(D7,OUTPUT);
digitalWrite(D7,HIGH); // Light the onboard LED so you know it's time to open your Serial Terminal
Serial.begin(9600);
while(!Serial.available()); // wait here for user to press ENTER in Serial Terminal
digitalWrite(D7,LOW);
Serial.println("program started");
SPI.begin();
/* Initialise the RFID reader */
RC522.init();
}
void loop()
{
/* Temporary loop counter */
byte i;
/* Has a card been detected? */
if (RC522.isCard())
{
/* If so then get its serial number */
RC522.readCardSerial();
Serial.println("Card detected:");
/* Output the serial number to the UART */
for(i = 0; i <= 4; i++)
{
Serial.print(RC522.serNum[i],HEX);
Serial.print(" ");
}
Serial.println("no card");
Serial.println();
}
}
on my serial, i get the program started, but then nothing else. seems it just crashes after that point…
any suggestions?
korneel, you need to hit a key in your serial console program so the program can continue! Did you do this? 
@peekay123 ofcourse 
as you can see, i added a line that said program started after the enter command to make sure that the program would actually start and as you see in my original comment, i can see that line after i press enter…
DOH! korneel, we know this worked before so first I will ask you to check your wiring carefully. Then modify this lines to eliminate doubt:
#define SS_PIN SS // Same pin used as hardware SPI (SS)
Remove these lines:
/* Define the pins used for the DATA OUT (MOSI), DATA IN (MISO) and CLOCK (SCK) pins for SOFTWARE SPI ONLY */
/* Change as required and may be same as hardware SPI as listed in comments */
#define MOSI_PIN D3 // hardware SPI: A5
#define MISO_PIN D4 // " " : A4
#define SCK_PIN D5 // " " : A3
In the “Create an instance of the RFID library”, remove all but this line:
RFID RC522(SS_PIN, RST_PIN); // Hardware SPI
If necessary, go back to the original code from my github but, like I said, this worked before. Let me know how it goes.
well, the program still starts… but nothing…
i checked the wiring twice and no mistakes…
i have:
3.3 V going to 3.3V PIN
RST going to D2
GND going to GND (the reader is giving me a red LED)
IRQ not connected
MISO to A4
Mosi to A5
SCK to A3
SDA to A2
going to original code now…
so i will make your life even worse now…
your code, completely unmoddified, no go…
i’m now breaking out an original arduino to check for functionality…
korneel, the wiring look right. Do you have anything else connected to the SPI pins besides the RC522? If so, disconnect all but the RC522.
A situation like this is always frustrating and going back to arduino to check if there is a problem with the board is a great idea. Keep me posted.
yup, always have the trusty arduino nearby 
so my arduino worked. it outputted the hex code immediately, no problem at all.
so i took all my stuff, back at spark again and trying.
seems not to be working…
i am adding additional lines to my code to verify the functionality and see if it crashes, and if it does, where… 
korneel, can you try using a different line for the RST_PIN instead of D2, like D3. Don’t forget to change the code also. This worked before so the question is, what changed.
I just noticed that the “no card” code in the wrong spot. Here is what loop() should be:
void loop()
{
/* Temporary loop counter */
byte i;
/* Has a card been detected? */
if (RC522.isCard())
{
/* If so then get its serial number */
RC522.readCardSerial();
Serial.println("Card detected:");
/* Output the serial number to the UART */
for(i = 0; i <= 4; i++)
{
Serial.print(RC522.serNum[i],HEX);
Serial.print(" ");
}
}
else {
Serial.println("no card");
Serial.println();
}
}
In the least, you should see “no card” on your console.
no idea what is happening… so the no card line does print now (i added a small delay as well as not get overwhelmed) but still no card detection… weird…
korneel, make sure #define _USE_SOFT_SPI_ is commented OUT in the RFID.h file!