InetrfaceProducts NXP / PCA9632

This is a driver code for the PCA9632 is an I2C-bus controlled 4-bit LED driver optimized for Red/Green/Blue/Amber (RGBA) color mixing applications. In Individual brightness control mode, each LED output has its own 8-bit resolution (256 steps) fixed frequency Individual PWM controller that operates at 1.5625 kHz with a duty cycle that is adjustable from 0 % to 99.6 % to allow the LED to be set to a specific brightness value. This library including device class and "LedPwmOut class API" for ease of use.

Dependencies:   CompLedDvr

Dependents:   PCA9632_Hello

Please refer to the component page for details

The PCA9632 is an I²C-bus controlled 4-bit LED driver optimized for Red/Green/Blue/Amber (RGBA) color mixing applications.

High-level API is available

A high-level API that can be used as the "PwmOut" of bed-SDK is available.
This API enables to make instances of each LED output pins and control PWM duty cycle by assignment.
For detail information, refer API document of LedPwmOut Class class which is included in PCA962xA class library.

#include "mbed.h"
#include "PCA9632.h"

PCA9632     led_cntlr( p28, p27, 0xC4 );  //  SDA, SCL, Slave_address(option)
LedPwmOut   led( led_cntlr, L0 );

int main()
{
    while( 1 ) {
        for( float p = 0.0f; p < 1.0f; p += 0.1f ) {
            led     = p;
            wait( 0.1 );
        }
    }
}

PCA9632.cpp

Committer:
nxp_ip
Date:
2015-03-04
Revision:
0:da1fe3fe7093

File content as of revision 0:da1fe3fe7093:

#include    "mbed.h"
#include    "PCA9632.h"

PCA9632::PCA9632( PinName i2c_sda, PinName i2c_scl, char i2c_address )
    : i2c_p( new I2C( i2c_sda, i2c_scl ) ), i2c( *i2c_p ), address( i2c_address )
{
    initialize();
}

PCA9632::PCA9632( I2C &i2c_, char i2c_address )
    : i2c_p( NULL ), i2c( i2c_ ), address( i2c_address )
{
    initialize();
}

PCA9632::~PCA9632()
{
    if ( NULL != i2c_p )
        delete  i2c_p;
}

void PCA9632::initialize( void )
{
    char init_array0[] = {
        AUTO_INCREMENT | REGISTER_START,   //  Command
        0x01, 0x00,                        //  MODE1, MODE2
    };
    char init_array1[] = {
        AUTO_INCREMENT | LEDOUT,           //  Command
        0xAA,                              //  LEDOUT
    };

    write( init_array0, sizeof( init_array0 ) );
    write( init_array1, sizeof( init_array1 ) );
}

void PCA9632::reset( void )
{
    char    va[]    = { 0xA5, 0x5A };
    i2c.write( 0x06, va, sizeof( va ) );
}

void PCA9632::pwm( int port, float v )
{
    char    reg_addr;

    if ( port < N_OF_PORTS ) {
        reg_addr    = PWM_REGISTER_START + port;
        write( reg_addr, (char)(v * 255.0) );
    } else {
        float   va[ N_OF_PORTS ];

        for ( int i = 0; i < N_OF_PORTS; i++ )
            va[ i ]  = v;

        pwm( va );
    }
}

void PCA9632::pwm( float *vp )
{
    char    data[ N_OF_PORTS + 1 ];

    *data    = PWM_REGISTER_START;

    for ( int i = 1; i <= N_OF_PORTS; i++ )
        data[ i ]   = (char)(*vp++ * 255.0);

    write( data, sizeof( data ) );
}

void PCA9632::write( char *data, int length )
{
    *data   |= AUTO_INCREMENT;
    i2c.write( address, data, length );
}

void PCA9632::write( char reg_addr, char data )
{
    char    c[2];

    c[0]    = reg_addr;
    c[1]    = data;

    i2c.write( address, c, 2 );
}

void PCA9632::read( char reg_addr, char *data, int length )
{
    reg_addr    |= 0x80;
    i2c.write( address, (char *)(&reg_addr), 1, true );
    i2c.read(  address, data, length );
}

char PCA9632::read( char reg_addr )
{
    i2c.write( address, (char *)(&reg_addr), 1, true );
    i2c.read(  address, (char *)(&reg_addr), 1 );

    return ( reg_addr );
}