PCA9635.cpp

00001 //NXP PCA9635 library
00002 //mbed Team     -   1st June 2011
00003 //Ioannis Kedros 
00004 //updated by Daniel Worrall - 28th June 2011
00005 
00006 #include "mbed.h"
00007 #include "PCA9635.h"
00008 
00009 PCA9635::PCA9635(PinName sda, PinName scl) : m_i2c(sda, scl) 
00010 {
00011     init(0x02); 
00012 } 
00013 
00014 
00015 //Driver Software Reset
00016 void PCA9635::reset(void){
00017     cmd[0] = 0x06;           
00018     int ack = m_i2c.write(m_addr, cmd, 1); 
00019     if(!ack);
00020     else return;
00021     cmd[0] = 0xA5;
00022     cmd[1] = 0x5A;
00023     m_i2c.write(m_addr, cmd, 2);
00024 }
00025 
00026 void PCA9635::init(int address){
00027     m_addr = address;
00028 
00029     reset();
00030 
00031     //Mode-1 Register: 
00032     cmd[0] = 0x00;           
00033     cmd[1] = 0x00; 
00034     m_i2c.write(address, cmd, 2);
00035 
00036     //Mode-2 Register: 
00037     cmd[0] = 0x01;           
00038     cmd[1] = 0x22; 
00039     m_i2c.write(address, cmd, 2);
00040     
00041     //LED Registers into PWM Control
00042     for(char i=0x14; i<0x18; i++)
00043     {
00044         cmd[0] = i;           
00045         cmd[1] = 0xAA; 
00046         m_i2c.write(address, cmd, 2);
00047     }
00048 }
00049 
00050 void PCA9635::setAddress(int address){
00051     m_addr = address;
00052 }
00053 
00054 //Single LED On
00055 void PCA9635::on(char led)
00056 {
00057     cmd[0] = led + 2;     //led position      
00058     cmd[1] = 0xFF;        //brightness value
00059     m_i2c.write(m_addr, cmd, 2);    
00060 }
00061 
00062 
00063 //Single LED Off
00064 void PCA9635::off(char led)
00065 {
00066     cmd[0] = led + 2;     //led position  
00067     cmd[1] = 0x00;        //brightness value
00068     m_i2c.write(m_addr, cmd, 2);  
00069 }
00070 
00071 
00072 void PCA9635::bus(short leds)
00073 {
00074     short temp = leds;          //check each bit of leds
00075     for(int j=0; j<16; j++) {
00076         if(temp & 1){       //set output according to LSB
00077             on(j);                
00078         }
00079         else {
00080             off(j);
00081         }
00082         temp = (temp >> 1);     //bitwise shift right by 1 to scan next bit
00083     }
00084 }
00085 
00086 //Brightness control for single or all LEDs
00087 void PCA9635::brightness(char led, char value)
00088 {
00089     if(led == ALL)
00090     {
00091         for(char allLeds=0x02; allLeds<0x12; allLeds++)
00092         {
00093             cmd[0] = allLeds;           
00094             cmd[1] = value; 
00095             m_i2c.write(m_addr, cmd, 2);
00096         }
00097     }
00098     else
00099     {
00100         cmd[0] = led + 2;           
00101         cmd[1] = value; 
00102         m_i2c.write(m_addr, cmd, 2);
00103     }
00104 }
00105 
00106 
00107 
00108 
00109 
00110