main.cpp

00001 #include "mbed.h"
00002 #include "MCP23S17.h"
00003 
00004 DigitalOut OnOffLED(LED1);
00005 DigitalIn OnOffBtn(p30);
00006 PwmOut PwmLED(LED4);
00007 DigitalIn PwmBtnA(p29);
00008 DigitalIn PwmBtnB(p28);
00009 
00010 DigitalOut DebugLEDA(LED2);
00011 DigitalOut DebugLEDB(LED3);
00012 
00013 SPI spi(p5, p6, p7);
00014 char Opcode = 0x40;
00015 MCP23S17 chip = MCP23S17(spi, p20, Opcode);
00016 
00017 
00018 
00019 int pwm_btn_val;
00020 
00021 int main()
00022 {
00023     //Init
00024     OnOffBtn.mode(PullUp);
00025     PwmBtnA.mode(PullDown);
00026     PwmBtnB.mode(PullDown);
00027 
00028     //Loop
00029     while(1) {
00030 
00031 
00032         //OnOff LED code
00033         OnOffLED = !OnOffBtn;
00034 
00035         //PWM example
00036         if(!PwmBtnA && !PwmBtnB)
00037             PwmLED = 0.0;
00038         else if(!PwmBtnA && PwmBtnB)
00039             PwmLED = 0.33;
00040         else if(PwmBtnA && !PwmBtnB)
00041             PwmLED = 0.66;
00042         else if(PwmBtnA && PwmBtnB)
00043             PwmLED = 1.0;
00044 
00045 
00046         //I/O Expander code
00047         //  Set all 8 Port A bits to output direction
00048         chip.direction(PORT_A, 0x00);
00049         //  Set all 8 Port B bits to input direction
00050         chip.direction(PORT_B, 0xFF);
00051         //action
00052         chip.write(PORT_A, (chip.read(PORT_B)&0x1)?0x80:0x00);
00053         
00054 
00055 
00056 
00057     }
00058 }