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

Embed: (wiki syntax)

« Back to documentation index

Show/hide line numbers main.cpp Source File

main.cpp

00001 #include "mbed.h"
00002 #include "PCA9955A.h"
00003 
00004 PCA9955A    led_cntlr( p28, p27, 0x02 );    //  SDA, SCL, Slave_address(option)
00005 LedPwmOutCC led0( led_cntlr, L0  );         //  Instance for LED0 pin
00006 LedPwmOutCC led1( led_cntlr, L1  );         //  Instance for LED1 pin
00007 LedPwmOutCC led2( led_cntlr, L2  );         //  Instance for LED2 pin
00008 
00009 int main()
00010 {
00011     led0.current( 0.5 );    //  LED0 pin current output setting to 50%
00012     led1.current( 0.5 );    //  LED1 pin current output setting to 50%
00013     led2.current( 0.5 );    //  LED2 pin current output setting to 50%
00014 
00015     while(1) {
00016         
00017         for ( float p = 1.0; p >= 0.0; p -= 0.01 ) {
00018             led0    = p;    //  Set LED0 output PWM dutycycle as 'p'
00019             wait( 0.01 );
00020         }
00021         
00022         for ( float p = 1.0; p >= 0.0; p -= 0.01 ) {
00023             led1    = p;    //  Set LED1 output PWM dutycycle as 'p'
00024             wait( 0.01 );
00025         }
00026         
00027         for ( float p = 1.0; p >= 0.0; p -= 0.01 ) {
00028             led2    = p;    //  Set LED2 output PWM dutycycle as 'p'
00029             wait( 0.01 );
00030         }
00031     }
00032 }