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/*
* LedControl.cpp - A library for controling Leds with a MAX7219/MAX7221
* Copyright (c) 2007 Eberhard Fahle, modified and adapted to run on a Raspberry Pi by Anorak
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* This permission notice shall be included in all copies or
* substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#include"LedControl.h"
LedControl::LedControl(constint dataPin, constint clkPin, constint csPin, int numDevices) {
//initialize the GPIOs
wiringPiSetupGpio();
//set the pins
SPI_MOSI=dataPin;
SPI_CLK=clkPin;
SPI_CS=csPin;
//set the number of devices used
if(numDevices<=0 || numDevices>MAX_DEVICES)
numDevices=MAX_DEVICES;
maxDevices=numDevices;
//initialize the pins
pinMode(SPI_MOSI,OUTPUT);
pinMode(SPI_CLK,OUTPUT);
pinMode(SPI_CS,OUTPUT);
digitalWrite(SPI_CS,HIGH);
//initialize all LED-states to off
for(int i=0;i<MAX_DEVICES*8;i++)
status[i]=0x00;
//initialize all displays
for(int i=0;i<maxDevices;i++) {
spiTransfer(i,OP_DISPLAYTEST,0);
//scanlimit is set to max on startup
setScanLimit(i,7);
//decode is done in source
spiTransfer(i,OP_DECODEMODE,0);
//we go into shutdown-mode on startup
shutdown(i,true);
//no, we don't
shutdown(i, false);
//prepare display
setIntensity(i, 8);
clearDisplay(i);
}
}
intLedControl::getDeviceCount() {
return maxDevices;
}
voidLedControl::shutdown(constint addr, constbool status) {
if(addr<0 || addr>=maxDevices)
return;
spiTransfer(addr, OP_SHUTDOWN,!status);
}
voidLedControl::setScanLimit(constint addr, constint limit) {
if(addr<0 || addr>=maxDevices)
return;
if(limit>=0 && limit<8)
spiTransfer(addr, OP_SCANLIMIT, limit);
}
voidLedControl::setIntensity(constint addr, constint intensity) {
if(addr<0 || addr>=maxDevices)
return;
if(intensity>=0 && intensity<16)
spiTransfer(addr, OP_INTENSITY, intensity);
}
voidLedControl::clearDisplay(constint addr) {
int offset;
if(addr<0 || addr>=maxDevices)
return;
offset=addr*8;
for(int i=0;i<8;i++) {
status[offset+i]=0;
spiTransfer(addr, i+1, status[offset+i]);
}
}
voidLedControl::setLed(constint addr, constint row, constint column, constbool state) {
int offset;
byte val=0x00;
if(addr<0 || addr>=maxDevices)
return;
if(row<0 || row>7 || column<0 || column>7)
return;
offset=addr*8;
val=0b10000000 >> column;
if(state)
status[offset+row]=status[offset+row]|val;
else {
val=~val;
status[offset+row]=status[offset+row]&val;
}
spiTransfer(addr, row+1, status[offset+row]);
}
voidLedControl::setRow(constint addr, constint row, const byte value) {
int offset;
if(addr<0 || addr>=maxDevices)
return;
if(row<0 || row>7)
return;
offset=addr*8;
status[offset+row]=value;
spiTransfer(addr, row+1, status[offset+row]);
}
voidLedControl::setColumn(constint addr, constint col, const byte value) {
byte val;
if(addr<0 || addr>=maxDevices)
return;
if(col<0 || col>7)
return;
for(int row=0;row<8;row++) {
val=value >> (7-row);
val=val & 0x01;
setLed(addr, row, col, val);
}
}
voidLedControl::setCharacter(constint addr, char character) {
if(character < '' || character > '~')
character = '';
const byte *charMap = digits[character-''];
for(int row=0; row<8; row++)
LedControl::setRow(addr, row, charMap[row]);
}
voidLedControl::spiTransfer(constint addr, volatileconst byte opcode, volatileconst byte data) {
//Create an array with the data to shift out
int offset=addr*2;
int maxbytes=maxDevices*2;
for(int i=0;i<maxbytes;i++)
spidata[i]=(byte)0;
//put our device data into the array
spidata[offset+1]=opcode;
spidata[offset]=data;
//Now shift out the data
digitalWrite(SPI_CS, LOW);
for(int i=maxbytes;i>0;i--)
shiftOut(spidata[i-1]);
digitalWrite(SPI_CS, HIGH);
}
voidLedControl::shiftOut(byte data) {
for(int i = 0; i < 8; i++) {
digitalWrite(SPI_MOSI, data & 0x80);
digitalWrite(SPI_CLK, HIGH);
data <<= 1;
digitalWrite(SPI_CLK, LOW);
}
}
voidLedControl::cleanUp() {
digitalWrite(SPI_CS, HIGH);
digitalWrite(SPI_CLK, LOW);
digitalWrite(SPI_MOSI, 0);
digitalWrite(SPI_CLK, HIGH);
digitalWrite(SPI_CLK, LOW);
}