Daniel Worrall / PCA9635

PCA9635 16-bit I2C-bus LED driver

Dependents:   digitalThermometer Counter SimpleClock printNumber ... more

PCA9635.cpp@0:d9cc568daeaf, 2011-06-28 (annotated)

Committer:
d_worrall
Date:
Tue Jun 28 10:03:49 2011 +0000
Revision:
0:d9cc568daeaf
Child:
2:9ca6a4fbab5e
version1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
d_worrall 0:d9cc568daeaf 1 //NXP PCA9635 library
d_worrall 0:d9cc568daeaf 2 //mbed Team - 1st June 2011
d_worrall 0:d9cc568daeaf 3 //Ioannis Kedros
d_worrall 0:d9cc568daeaf 4 //updated by Daniel Worrall - 28th June 2011
d_worrall 0:d9cc568daeaf 5
d_worrall 0:d9cc568daeaf 6 #include "mbed.h"
d_worrall 0:d9cc568daeaf 7 #include "PCA9635.h"
d_worrall 0:d9cc568daeaf 8
d_worrall 0:d9cc568daeaf 9
d_worrall 0:d9cc568daeaf 10 PCA9635::PCA9635(PinName sda, PinName scl, int addr) : m_i2c(sda, scl), m_addr(addr)
d_worrall 0:d9cc568daeaf 11 {
d_worrall 0:d9cc568daeaf 12 init();
d_worrall 0:d9cc568daeaf 13 }
d_worrall 0:d9cc568daeaf 14
d_worrall 0:d9cc568daeaf 15
d_worrall 0:d9cc568daeaf 16 //Driver Software Reset
d_worrall 0:d9cc568daeaf 17 void PCA9635::reset(void){
d_worrall 0:d9cc568daeaf 18 cmd[0] = 0x03;
d_worrall 0:d9cc568daeaf 19 m_i2c.write(m_addr, cmd, 1);
d_worrall 0:d9cc568daeaf 20 }
d_worrall 0:d9cc568daeaf 21
d_worrall 0:d9cc568daeaf 22 void PCA9635::init(void){
d_worrall 0:d9cc568daeaf 23 reset();
d_worrall 0:d9cc568daeaf 24
d_worrall 0:d9cc568daeaf 25 //Mode-1 Register:
d_worrall 0:d9cc568daeaf 26 cmd[0] = 0x00;
d_worrall 0:d9cc568daeaf 27 cmd[1] = 0x00;
d_worrall 0:d9cc568daeaf 28 m_i2c.write(m_addr, cmd, 2);
d_worrall 0:d9cc568daeaf 29
d_worrall 0:d9cc568daeaf 30 //Mode-2 Register:
d_worrall 0:d9cc568daeaf 31 cmd[0] = 0x01;
d_worrall 0:d9cc568daeaf 32 cmd[1] = 0x22;
d_worrall 0:d9cc568daeaf 33 m_i2c.write(m_addr, cmd, 2);
d_worrall 0:d9cc568daeaf 34
d_worrall 0:d9cc568daeaf 35 //LED Registers into PWM Control
d_worrall 0:d9cc568daeaf 36 for(char i=0x14; i<0x18; i++)
d_worrall 0:d9cc568daeaf 37 {
d_worrall 0:d9cc568daeaf 38 cmd[0] = i;
d_worrall 0:d9cc568daeaf 39 cmd[1] = 0xAA;
d_worrall 0:d9cc568daeaf 40 m_i2c.write(m_addr, cmd, 2);
d_worrall 0:d9cc568daeaf 41 }
d_worrall 0:d9cc568daeaf 42 }
d_worrall 0:d9cc568daeaf 43
d_worrall 0:d9cc568daeaf 44
d_worrall 0:d9cc568daeaf 45 //Single LED On
d_worrall 0:d9cc568daeaf 46 void PCA9635::on(char led)
d_worrall 0:d9cc568daeaf 47 {
d_worrall 0:d9cc568daeaf 48 cmd[0] = led + 2; //led position
d_worrall 0:d9cc568daeaf 49 cmd[1] = 0xFF; //brightness value
d_worrall 0:d9cc568daeaf 50 m_i2c.write(m_addr, cmd, 2);
d_worrall 0:d9cc568daeaf 51 }
d_worrall 0:d9cc568daeaf 52
d_worrall 0:d9cc568daeaf 53
d_worrall 0:d9cc568daeaf 54 //Single LED Off
d_worrall 0:d9cc568daeaf 55 void PCA9635::off(char led)
d_worrall 0:d9cc568daeaf 56 {
d_worrall 0:d9cc568daeaf 57 cmd[0] = led + 2; //led position
d_worrall 0:d9cc568daeaf 58 cmd[1] = 0x00; //brightness value
d_worrall 0:d9cc568daeaf 59 m_i2c.write(m_addr, cmd, 2);
d_worrall 0:d9cc568daeaf 60 }
d_worrall 0:d9cc568daeaf 61
d_worrall 0:d9cc568daeaf 62
d_worrall 0:d9cc568daeaf 63 void PCA9635::bus(short leds)
d_worrall 0:d9cc568daeaf 64 {
d_worrall 0:d9cc568daeaf 65 short temp = leds; //check each bit of leds
d_worrall 0:d9cc568daeaf 66 bool stat = false; //check LSB of temp
d_worrall 0:d9cc568daeaf 67 for(int j=0; j<16; j++) {
d_worrall 0:d9cc568daeaf 68 stat = (bool)(temp & 0x0001);
d_worrall 0:d9cc568daeaf 69 if(stat == true){ //set output accordingly
d_worrall 0:d9cc568daeaf 70 on(j);
d_worrall 0:d9cc568daeaf 71 }
d_worrall 0:d9cc568daeaf 72 else {
d_worrall 0:d9cc568daeaf 73 off(j);
d_worrall 0:d9cc568daeaf 74 }
d_worrall 0:d9cc568daeaf 75 temp = (temp >> 1); //bitwise shift right by 1 to scan next bit
d_worrall 0:d9cc568daeaf 76 }
d_worrall 0:d9cc568daeaf 77 }
d_worrall 0:d9cc568daeaf 78
d_worrall 0:d9cc568daeaf 79 //Brightness control for single or all LEDs
d_worrall 0:d9cc568daeaf 80 void PCA9635::brightness(char led, char value)
d_worrall 0:d9cc568daeaf 81 {
d_worrall 0:d9cc568daeaf 82 if(led == ALL)
d_worrall 0:d9cc568daeaf 83 {
d_worrall 0:d9cc568daeaf 84 for(char allLeds=0x02; allLeds<0x12; allLeds++)
d_worrall 0:d9cc568daeaf 85 {
d_worrall 0:d9cc568daeaf 86 cmd[0] = allLeds;
d_worrall 0:d9cc568daeaf 87 cmd[1] = value;
d_worrall 0:d9cc568daeaf 88 m_i2c.write(m_addr, cmd, 2);
d_worrall 0:d9cc568daeaf 89 }
d_worrall 0:d9cc568daeaf 90 }
d_worrall 0:d9cc568daeaf 91 else
d_worrall 0:d9cc568daeaf 92 {
d_worrall 0:d9cc568daeaf 93 cmd[0] = led + 2;
d_worrall 0:d9cc568daeaf 94 cmd[1] = value;
d_worrall 0:d9cc568daeaf 95 m_i2c.write(m_addr, cmd, 2);
d_worrall 0:d9cc568daeaf 96 }
d_worrall 0:d9cc568daeaf 97 }
d_worrall 0:d9cc568daeaf 98
d_worrall 0:d9cc568daeaf 99
d_worrall 0:d9cc568daeaf 100
d_worrall 0:d9cc568daeaf 101
d_worrall 0:d9cc568daeaf 102
d_worrall 0:d9cc568daeaf 103