Tedd OKANO / Mbed 2 deprecated PCA9955A_simple

PCA9955A test program

Dependencies:   mbed

main.cpp@5:b93b28e126fe, 2021-10-20 (annotated)

Committer:
okano
Date:
Wed Oct 20 08:17:05 2021 +0000
Revision:
5:b93b28e126fe
Parent:
4:507e37f8008d 
comment added

Who changed what in which revision?

UserRevisionLine numberNew contents of line
okano 0:a173ba5ecb1a 1 #include "mbed.h"
okano 4:507e37f8008d 2 #include "PCA9955A_registers.h"
okano 0:a173ba5ecb1a 3
okano 0:a173ba5ecb1a 4 I2C i2c( p28, p27 ); // SDA, SCL
okano 0:a173ba5ecb1a 5
okano 5:b93b28e126fe 6 #define SLAVE_ADDR 0x02 // I2C target (slave) adress
okano 0:a173ba5ecb1a 7
okano 1:0a5e299bf3ef 8 void register_write( char addr, char data );
okano 0:a173ba5ecb1a 9
okano 0:a173ba5ecb1a 10 int main()
okano 0:a173ba5ecb1a 11 {
okano 4:507e37f8008d 12 // initialization
okano 4:507e37f8008d 13
okano 5:b93b28e126fe 14 register_write( MODE1, 0x00 ); // mode setting
okano 5:b93b28e126fe 15 register_write( MODE2, 0x25 ); // mode setting
okano 5:b93b28e126fe 16 register_write( LEDOUT0, 0xAA ); // PWM output setting for LED0 .. LED3
okano 5:b93b28e126fe 17 register_write( LEDOUT1, 0xAA ); // PWM output setting for LED4 .. LED7
okano 5:b93b28e126fe 18 register_write( LEDOUT2, 0xAA ); // PWM output setting for LED8 .. LED11
okano 5:b93b28e126fe 19 register_write( LEDOUT3, 0xAA ); // PWM output setting for LED12 .. LED15
okano 5:b93b28e126fe 20 register_write( IREFALL, 0x10 ); // set all IREF register (output current setting)
okano 4:507e37f8008d 21
okano 4:507e37f8008d 22 // operation loop
okano 0:a173ba5ecb1a 23
okano 4:507e37f8008d 24 while ( 1 ) {
okano 4:507e37f8008d 25
okano 5:b93b28e126fe 26 // LED0 luminanceset from 0 to max by PWM
okano 4:507e37f8008d 27 for ( int i = 0; i < 256; i++ ) {
okano 4:507e37f8008d 28 register_write( PWM0, i );
okano 4:507e37f8008d 29 wait( 0.01 );
okano 4:507e37f8008d 30 }
okano 0:a173ba5ecb1a 31
okano 5:b93b28e126fe 32 // LED0 luminanceset from max to 0 by PWM
okano 4:507e37f8008d 33 for ( int i = 255; i >= 0; i-- ) {
okano 4:507e37f8008d 34 register_write( PWM0, i );
okano 4:507e37f8008d 35 wait( 0.01 );
okano 4:507e37f8008d 36 }
okano 1:0a5e299bf3ef 37 }
okano 0:a173ba5ecb1a 38 }
okano 1:0a5e299bf3ef 39
okano 5:b93b28e126fe 40 void register_write( char addr /* register address */, char data /* data value */ )
okano 1:0a5e299bf3ef 41 {
okano 1:0a5e299bf3ef 42 char d[ 2 ];
okano 2:ead3652b6fd2 43
okano 1:0a5e299bf3ef 44 d[ 0 ] = addr;
okano 1:0a5e299bf3ef 45 d[ 1 ] = data;
okano 5:b93b28e126fe 46 i2c.write( SLAVE_ADDR, d, 2 ); // two bytes transfer to I2C target device which has address of SLAVE_ADDR
okano 1:0a5e299bf3ef 47 }
okano 1:0a5e299bf3ef 48