main.cpp

00001 /**
00002  *  PCA9546A library "Hello world" sample
00003  *
00004  *  @author  Tedd OKANO
00005  *  @version 0.1
00006  *  @date    Feb-2015
00007  *
00008  *  PCA9546A: an I2C bus switch control library
00009  *
00010  *  The PCA9546A is a quad bidirectional translating switch controlled
00011  *  via the I2C-bus. The SCL/SDA upstream pair fans out to four downstream
00012  *  pairs, or channels. Any individual SCx/SDx channel or combination of
00013  *  channels can be selected, determined by the contents of the programmable
00014  *  control register.
00015  *
00016  *  For more information about PCA9546A:
00017  *    http://www.nxp.com/documents/data_sheet/PCA9546A.pdf
00018  *
00019  */
00020 
00021 #include "mbed.h"
00022 #include "LM75B.h"
00023 #include "PCA9546A.h"
00024 
00025 PCA9546A    i2c_sw( p28, p27, 0xE0 );
00026 
00027 int main()
00028 {
00029     //  all PCA9546A's downstream ports are OFF after power-up and hardware-reset
00030     
00031     i2c_sw.on( 0 );     //  turn-ON  the channel 0
00032 
00033     LM75B   tmp0( p28, p27 );   //  making instance after a branch of I2C bus (which is connecting the LM75B) enabled
00034 
00035     i2c_sw.off( 0 );    //  turn-OFF the channel 0
00036     i2c_sw.on( 1 );     //  turn-ON  the channel 1
00037 
00038     LM75B   tmp1( p28, p27 );   //  making instance after a branch of I2C bus (which is connecting the LM75B) enabled
00039 
00040     while(1) {
00041         
00042         i2c_sw.off( 1 );    //  turn-OFF the channel 1
00043         i2c_sw.on( 0 );     //  turn-ON  the channel 0
00044         printf( "%.3f\r\n", tmp0.read() );
00045 
00046         i2c_sw.off( 0 );    //  turn-OFF the channel 0
00047         i2c_sw.on( 1 );     //  turn-ON  the channel 1
00048         printf( "%.3f\r\n", tmp1.read() );
00049 
00050         wait( 1.0 );
00051     }
00052 }