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Dependencies:   mbed

main.cpp@2:029b0a855b82, 2016-01-30 (annotated)

Committer:
mikeb
Date:
Sat Jan 30 02:34:55 2016 +0000
Revision:
2:029b0a855b82
Parent:
1:c5bc18044085
Child:
3:ecfa4fa0b5a7
Functional on Parts 1-4

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mikeb 0:8f5b2af5e1d5 1 /**
mikeb 0:8f5b2af5e1d5 2 * This program reads in the state of the external DIP switch
mikeb 0:8f5b2af5e1d5 3 * and outputs it to the LED using the MCP23S17 I/O expander chip
mikeb 0:8f5b2af5e1d5 4 *
mikeb 0:8f5b2af5e1d5 5 * @author(s): Gedeon Nyengele & Mike Bossi
mikeb 0:8f5b2af5e1d5 6 * @date: 01/29/2016
mikeb 0:8f5b2af5e1d5 7 */
mikeb 0:8f5b2af5e1d5 8 #include "mbed.h"
mikeb 0:8f5b2af5e1d5 9 #include "wdt.h"
mikeb 0:8f5b2af5e1d5 10 #include "MCP23S17.h"
mikeb 2:029b0a855b82 11 #include "Nav_Switch.h"
mikeb 0:8f5b2af5e1d5 12
mikeb 0:8f5b2af5e1d5 13
mikeb 0:8f5b2af5e1d5 14
mikeb 0:8f5b2af5e1d5 15 DigitalOut LED_1(p21);
mikeb 0:8f5b2af5e1d5 16 PwmOut LED_2(p22);
mikeb 0:8f5b2af5e1d5 17 DigitalIn switch1(p23);
mikeb 0:8f5b2af5e1d5 18 DigitalIn switch2(p24);
mikeb 0:8f5b2af5e1d5 19 DigitalIn switch3(p25);
mikeb 0:8f5b2af5e1d5 20 DigitalIn switch4(p26);
mikeb 0:8f5b2af5e1d5 21
mikeb 0:8f5b2af5e1d5 22 // Create an SPI bus
mikeb 0:8f5b2af5e1d5 23 SPI spi(p5, p6, p7);
mikeb 0:8f5b2af5e1d5 24
mikeb 0:8f5b2af5e1d5 25 // Device opcode, as defined in datasheet
mikeb 0:8f5b2af5e1d5 26
mikeb 0:8f5b2af5e1d5 27
mikeb 0:8f5b2af5e1d5 28 // Read switch state and show state on LED
mikeb 0:8f5b2af5e1d5 29 // Assumption: Switch connected to GPB0 (MCP23S17 pin 1)
mikeb 0:8f5b2af5e1d5 30 // LED connected to GPA0 (MCP23S17 pin 21)
mikeb 0:8f5b2af5e1d5 31
mikeb 0:8f5b2af5e1d5 32 Watchdog wdt;
mikeb 0:8f5b2af5e1d5 33 BusIn _pins(p28, p29, p30);
mikeb 0:8f5b2af5e1d5 34
mikeb 0:8f5b2af5e1d5 35 int main()
mikeb 0:8f5b2af5e1d5 36 {
mikeb 0:8f5b2af5e1d5 37
mikeb 0:8f5b2af5e1d5 38 _pins.mode(PullUp);
mikeb 2:029b0a855b82 39 Nav_Switch myNav( p18, p15, p16, p19, p17);
mikeb 0:8f5b2af5e1d5 40
mikeb 0:8f5b2af5e1d5 41 char Opcode = 0x40;
mikeb 0:8f5b2af5e1d5 42
mikeb 0:8f5b2af5e1d5 43 MCP23S17 chip(spi, p20, Opcode);
mikeb 0:8f5b2af5e1d5 44
mikeb 0:8f5b2af5e1d5 45 // Set PORT_A pins to be output pins
mikeb 0:8f5b2af5e1d5 46 chip.direction(PORT_A, 0x00);
mikeb 0:8f5b2af5e1d5 47
mikeb 0:8f5b2af5e1d5 48 // Set PORT_B pins to be input pins
mikeb 0:8f5b2af5e1d5 49 chip.direction(PORT_B, 0xFF);
mikeb 0:8f5b2af5e1d5 50 wdt.kick(5.0);
mikeb 0:8f5b2af5e1d5 51 int switch_1 = 0;
mikeb 0:8f5b2af5e1d5 52 int switch_2 = 0;
mikeb 0:8f5b2af5e1d5 53 int switch_3 = 0;
mikeb 0:8f5b2af5e1d5 54
mikeb 0:8f5b2af5e1d5 55 // int switch_4 = 0;
mikeb 0:8f5b2af5e1d5 56 short lockUpCount = 0;
mikeb 0:8f5b2af5e1d5 57
mikeb 0:8f5b2af5e1d5 58 switch3.mode(PullUp);
mikeb 0:8f5b2af5e1d5 59 switch4.mode(PullUp);
mikeb 2:029b0a855b82 60
mikeb 2:029b0a855b82 61 wait(.45);
mikeb 2:029b0a855b82 62
mikeb 0:8f5b2af5e1d5 63
mikeb 0:8f5b2af5e1d5 64 while(1){
mikeb 0:8f5b2af5e1d5 65
mikeb 0:8f5b2af5e1d5 66
mikeb 0:8f5b2af5e1d5 67 wdt.kick();
mikeb 0:8f5b2af5e1d5 68
mikeb 0:8f5b2af5e1d5 69 if(!switch4){
mikeb 0:8f5b2af5e1d5 70 lockUpCount++;
mikeb 0:8f5b2af5e1d5 71 if (lockUpCount > 100)
mikeb 0:8f5b2af5e1d5 72 while(1) {}
mikeb 0:8f5b2af5e1d5 73 }
mikeb 1:c5bc18044085 74
mikeb 1:c5bc18044085 75
mikeb 0:8f5b2af5e1d5 76 switch (_pins){
mikeb 1:c5bc18044085 77 case 0x7:
mikeb 0:8f5b2af5e1d5 78 if(!switch1)
mikeb 1:c5bc18044085 79 LED_1 = 1;
mikeb 1:c5bc18044085 80 else
mikeb 1:c5bc18044085 81 LED_1 = 0;
mikeb 0:8f5b2af5e1d5 82
mikeb 1:c5bc18044085 83 switch_1 = switch1.read();
mikeb 1:c5bc18044085 84 switch_2 = switch2.read();
mikeb 1:c5bc18044085 85 switch_3 = switch3.read();
mikeb 0:8f5b2af5e1d5 86
mikeb 1:c5bc18044085 87 LED_2 = !switch_1*0.25 + !switch_2 * 0.40 + !switch_3*0.35;
mikeb 1:c5bc18044085 88 break;
mikeb 0:8f5b2af5e1d5 89
mikeb 1:c5bc18044085 90 case 0x6:
mikeb 1:c5bc18044085 91 chip.write(PORT_A, chip.read(PORT_B) & 0x01);
mikeb 1:c5bc18044085 92 break;
mikeb 1:c5bc18044085 93
mikeb 1:c5bc18044085 94 case 0x5:
mikeb 2:029b0a855b82 95 mbedleds = ~(myNav & 0x0F); //update leds with nav switch direction inputs
mikeb 2:029b0a855b82 96 if(myNav.fire()) mbedleds = 0x0F;
mikeb 1:c5bc18044085 97 break;
mikeb 0:8f5b2af5e1d5 98
mikeb 0:8f5b2af5e1d5 99 }
mikeb 0:8f5b2af5e1d5 100
mikeb 2:029b0a855b82 101 wait(0.05);
mikeb 0:8f5b2af5e1d5 102 }
mikeb 0:8f5b2af5e1d5 103
mikeb 0:8f5b2af5e1d5 104 }
mikeb 0:8f5b2af5e1d5 105