m b
/
4180Lab1
Complete
main.cpp
- Committer:
- mikeb
- Date:
- 2016-01-30
- Revision:
- 0:8f5b2af5e1d5
- Child:
- 1:c5bc18044085
File content as of revision 0:8f5b2af5e1d5:
/** * This program reads in the state of the external DIP switch * and outputs it to the LED using the MCP23S17 I/O expander chip * * @author(s): Gedeon Nyengele & Mike Bossi * @date: 01/29/2016 */ #include "mbed.h" #include "wdt.h" #include "MCP23S17.h" DigitalOut LED_1(p21); PwmOut LED_2(p22); DigitalIn switch1(p23); DigitalIn switch2(p24); DigitalIn switch3(p25); DigitalIn switch4(p26); // Create an SPI bus SPI spi(p5, p6, p7); // Device opcode, as defined in datasheet // Read switch state and show state on LED // Assumption: Switch connected to GPB0 (MCP23S17 pin 1) // LED connected to GPA0 (MCP23S17 pin 21) Watchdog wdt; BusIn _pins(p28, p29, p30); int main() { _pins.mode(PullUp); char Opcode = 0x40; MCP23S17 chip(spi, p20, Opcode); // Set PORT_A pins to be output pins chip.direction(PORT_A, 0x00); // Set PORT_B pins to be input pins chip.direction(PORT_B, 0xFF); wdt.kick(5.0); int switch_1 = 0; int switch_2 = 0; int switch_3 = 0; // int switch_4 = 0; short lockUpCount = 0; switch3.mode(PullUp); switch4.mode(PullUp); // Delay for initial pullup to take effect wait(.25); // Setup Interrupt callback functions for a pb hit while(1){ wdt.kick(); if(!switch4){ lockUpCount++; if (lockUpCount > 100) while(1) {} } switch (_pins){ case 0x0: if(!switch1) LED_1 = 1; else LED_1 = 0; switch_1 = switch1.read(); switch_2 = switch2.read(); switch_3 = switch3.read(); LED_2 = !switch_1*0.25 + !switch_2 * 0.40 + !switch_3*0.35; } } }