Hello world code for PCA9955A class library. The PCA9955A is a 16-channel Fm+ I2C-bus 57mA/20V constant current LED driver. This program shows its basic operation of PWM and current settings.

Dependencies:   PCA995xA mbed

Please refer to the component page for details

PCA9955B and PCA9956B are I²C-bus controlled 16-channel constant current LED driver optimized for dimming and blinking.

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.
Output current also controllable by API function.
For detail information, refer API document of LedPwmOutCC Class class which is included in PCA995xA class library.

#include "mbed.h"
#include "PCA9956A.h"

PCA9956A    led_cntlr( p28, p27, 0xC4 );  //  SDA, SCL, Slave_address(option)
LedPwmOutCC led( led_cntlr, L0 );

int main()
{
    while( 1 ) {
        for( float p = 0.0f; p < 1.0f; p += 0.1f ) {
            led     = p;
            wait( 0.1 );
        }
    }
}
Committer:
nxp_ip
Date:
Wed Mar 04 10:33:14 2015 +0000
Revision:
2:cfa5103184b1
Parent:
1:8b5c26cc269c
Child:
3:a67c21ad4173
Library updated

Who changed what in which revision?

UserRevisionLine numberNew contents of line
nxp_ip 0:ec8cc77909e5 1 #include "mbed.h"
nxp_ip 0:ec8cc77909e5 2
nxp_ip 0:ec8cc77909e5 3 #include "PCA9955A.h"
nxp_ip 0:ec8cc77909e5 4 PCA9955A led_cntlr( p28, p27, 0x02 ); // SDA, SCL, Slave_address(option)
nxp_ip 0:ec8cc77909e5 5
nxp_ip 1:8b5c26cc269c 6 int main()
nxp_ip 0:ec8cc77909e5 7 {
nxp_ip 0:ec8cc77909e5 8 led_cntlr.current( ALLPORTS, 1.0 ); // Set all ports output current 100%
nxp_ip 0:ec8cc77909e5 9
nxp_ip 0:ec8cc77909e5 10 while(1) {
nxp_ip 0:ec8cc77909e5 11 for ( int port = 0; port < led_cntlr.number_of_ports(); port++ ) {
nxp_ip 0:ec8cc77909e5 12 for ( int i = 1; i <= 100; i++ ) {
nxp_ip 0:ec8cc77909e5 13 led_cntlr.pwm( port, (float)i / 100.0 );
nxp_ip 0:ec8cc77909e5 14 wait( 0.01 );
nxp_ip 0:ec8cc77909e5 15 }
nxp_ip 0:ec8cc77909e5 16 }
nxp_ip 0:ec8cc77909e5 17 led_cntlr.pwm( ALLPORTS, 0.0 ); // Set all ports output PWM 0%
nxp_ip 0:ec8cc77909e5 18 }
nxp_ip 0:ec8cc77909e5 19 }
nxp_ip 2:cfa5103184b1 20
nxp_ip 2:cfa5103184b1 21
nxp_ip 2:cfa5103184b1 22
nxp_ip 2:cfa5103184b1 23 #if 0 // Sample of using LedPwmOut API
nxp_ip 2:cfa5103184b1 24 #include "mbed.h"
nxp_ip 2:cfa5103184b1 25 #include "PCA9955A.h"
nxp_ip 2:cfa5103184b1 26
nxp_ip 2:cfa5103184b1 27 PCA9955A led_cntlr( p28, p27, 0x02 );
nxp_ip 2:cfa5103184b1 28 LedPwmOutCC leds[] = {
nxp_ip 2:cfa5103184b1 29 LedPwmOutCC( led_cntlr, L0 ),
nxp_ip 2:cfa5103184b1 30 LedPwmOutCC( led_cntlr, L4 ),
nxp_ip 2:cfa5103184b1 31 LedPwmOutCC( led_cntlr, L8 ),
nxp_ip 2:cfa5103184b1 32 LedPwmOutCC( led_cntlr, L12 ),
nxp_ip 2:cfa5103184b1 33
nxp_ip 2:cfa5103184b1 34 LedPwmOutCC( led_cntlr, L1 ),
nxp_ip 2:cfa5103184b1 35 LedPwmOutCC( led_cntlr, L5 ),
nxp_ip 2:cfa5103184b1 36 LedPwmOutCC( led_cntlr, L9 ),
nxp_ip 2:cfa5103184b1 37 LedPwmOutCC( led_cntlr, L13 ),
nxp_ip 2:cfa5103184b1 38
nxp_ip 2:cfa5103184b1 39 LedPwmOutCC( led_cntlr, L2 ),
nxp_ip 2:cfa5103184b1 40 LedPwmOutCC( led_cntlr, L6 ),
nxp_ip 2:cfa5103184b1 41 LedPwmOutCC( led_cntlr, L10 ),
nxp_ip 2:cfa5103184b1 42 LedPwmOutCC( led_cntlr, L14 ),
nxp_ip 2:cfa5103184b1 43
nxp_ip 2:cfa5103184b1 44 LedPwmOutCC( led_cntlr, L3 ),
nxp_ip 2:cfa5103184b1 45 LedPwmOutCC( led_cntlr, L7 ),
nxp_ip 2:cfa5103184b1 46 LedPwmOutCC( led_cntlr, L11 ),
nxp_ip 2:cfa5103184b1 47 LedPwmOutCC( led_cntlr, L15 ),
nxp_ip 2:cfa5103184b1 48
nxp_ip 2:cfa5103184b1 49 };
nxp_ip 2:cfa5103184b1 50
nxp_ip 2:cfa5103184b1 51 int main()
nxp_ip 2:cfa5103184b1 52 {
nxp_ip 2:cfa5103184b1 53 for ( int ch = 0; ch < 16; ch++ )
nxp_ip 2:cfa5103184b1 54 leds[ ch ] = 1.0;
nxp_ip 2:cfa5103184b1 55 for ( int ch = 0; ch < 16; ch++ )
nxp_ip 2:cfa5103184b1 56 leds[ ch ].current( 0.0 );
nxp_ip 2:cfa5103184b1 57
nxp_ip 2:cfa5103184b1 58 while(1) {
nxp_ip 2:cfa5103184b1 59 for ( int ch = 0; ch < 16; ch++ ) {
nxp_ip 2:cfa5103184b1 60 for ( float p = 0.0; p < 1.0; p += 0.01 ) {
nxp_ip 2:cfa5103184b1 61 // leds[ ch ] = p;
nxp_ip 2:cfa5103184b1 62 leds[ ch ].current( p );
nxp_ip 2:cfa5103184b1 63 wait( 0.01 );
nxp_ip 2:cfa5103184b1 64 }
nxp_ip 2:cfa5103184b1 65 }
nxp_ip 2:cfa5103184b1 66 for ( float c = 1.0; c > 0.0; c -= 0.01 ) {
nxp_ip 2:cfa5103184b1 67 for ( int ch = 0; ch < 16; ch++ ) {
nxp_ip 2:cfa5103184b1 68 leds[ ch ].current( c );
nxp_ip 2:cfa5103184b1 69
nxp_ip 2:cfa5103184b1 70 }
nxp_ip 2:cfa5103184b1 71 wait( 0.01 );
nxp_ip 2:cfa5103184b1 72 }
nxp_ip 2:cfa5103184b1 73 }
nxp_ip 2:cfa5103184b1 74 }
nxp_ip 2:cfa5103184b1 75 #endif