main.cpp

00001 /*
00002  *  mbed + LPCXpresso_baseboard demo code
00003  *
00004  *   This code has been made for a training session. 
00005  *
00006  *   With this code, the mbed drives PCA9532 to control 16 LEDs. 
00007  *   The LED blinked in pattern. 
00008  *
00009  *   On this demo, the ISL29003 is also driven to get ambient 
00010  *   light level. The ambient light get dark, the LED blightness 
00011  *   get low. The LEDs are controlled by PWM function of PCA9532. 
00012  *
00013  *  Copyright (c) 2010 NXP Semiconductors Japan
00014  *  Released under the MIT License: http://mbed.org/license/mit
00015  *
00016  *  revision 1.0  16-Feb-2010   1st release
00017  */
00018 
00019 #include "mbed.h"
00020 
00021 I2C     i2c( p28, p27 );
00022 Serial  pc( USBTX, USBRX );
00023 
00024 const int   PCA9532_addr  = 0xC0;
00025 const int   ISL29003_addr = 0x88;
00026 
00027 class baseboard_led_array {
00028 public:
00029 
00030     baseboard_led_array() {
00031     }
00032 
00033     ~baseboard_led_array() {
00034     }
00035 
00036     void operator=( int c ) {
00037 
00038         char        a[ 5 ]  = { 0x16, 0x00, 0x00, 0x00, 0x00 };
00039         const char  v       = 0x2;
00040 
00041         for ( int i = 0; i < 16; i++ )
00042             a[ (i / 4) + 1 ]  |= (((c >> i) & 0x1) ? v : 0x0) << ((i % 4) << 1);
00043 
00044         i2c.write( PCA9532_addr, a, 5 );
00045     }
00046 
00047     void pwm0( char c ) {
00048         char    cmd[ 2 ];
00049 
00050         cmd[ 0 ]    = 0x03;
00051         cmd[ 1 ]    = c;
00052         i2c.write( PCA9532_addr, cmd, 2 );
00053     }
00054 };
00055 
00056 
00057 class light_sensor {
00058 public:
00059 
00060     light_sensor() {
00061         char    cmd[ 2 ];
00062 
00063         cmd[ 0 ]    = 0x00;
00064         cmd[ 1 ]    = 0x80;
00065         i2c.write( ISL29003_addr, cmd, 2 );
00066 
00067         cmd[ 0 ]    = 0x01;
00068         cmd[ 1 ]    = 0x00;
00069         i2c.write( ISL29003_addr, cmd, 2 );
00070     }
00071 
00072     ~light_sensor() {
00073     }
00074 
00075     operator short( void ) {
00076 
00077         short   v;
00078         char    cmd;
00079 
00080         cmd    = 0x04;
00081         i2c.write( ISL29003_addr, &cmd, 1 );
00082         i2c.read( ISL29003_addr, &cmd, 1 );
00083         v   = cmd;
00084 
00085         cmd    = 0x05;
00086         i2c.write( ISL29003_addr, &cmd, 1 );
00087         i2c.read( ISL29003_addr, &cmd, 1 );
00088 
00089         return( (((short)cmd) << 8) | v );
00090     }
00091 };
00092 
00093 baseboard_led_array     ledarr;
00094 light_sensor            sensor;
00095 
00096 int main() {
00097 
00098     unsigned long   c   = 0x00000F0F;
00099     short           b;
00100 
00101     while ( 1 ) {
00102     
00103         b   = sensor >> 6;
00104         ledarr.pwm0( b > 255 ? 255 : (char)b );
00105         
00106         c   <<= 1;
00107         c   |= c & 0x10000 ? 0x1 : 0x0;
00108         ledarr   = c;
00109 
00110         wait( 0.05 );
00111     }
00112 }
00113