Allen Wild / Mbed 2 deprecated 4180_L1

ECE 4180 Lab 1

Dependencies:   MCP23S17 ShiftBrite mbed-rtos mbed

main.cpp@0:d5e1eec2689a, 2014-01-28 (annotated)

Committer:
aswild
Date:
Tue Jan 28 16:50:08 2014 +0000
Revision:
0:d5e1eec2689a
testing 123

Who changed what in which revision?

UserRevisionLine numberNew contents of line
aswild 0:d5e1eec2689a 1 /*
aswild 0:d5e1eec2689a 2 * Allen Wild
aswild 0:d5e1eec2689a 3 * Joseph Guinta
aswild 0:d5e1eec2689a 4 *
aswild 0:d5e1eec2689a 5 * ECE 4180 Lab 1
aswild 0:d5e1eec2689a 6 */
aswild 0:d5e1eec2689a 7
aswild 0:d5e1eec2689a 8 #include "mbed.h"
aswild 0:d5e1eec2689a 9 #include "rtos.h"
aswild 0:d5e1eec2689a 10 #include "MCP23S17.h"
aswild 0:d5e1eec2689a 11 #include "ShiftBrite.h"
aswild 0:d5e1eec2689a 12
aswild 0:d5e1eec2689a 13 #define PB0_PIN p20
aswild 0:d5e1eec2689a 14 #define LED_PIN p29
aswild 0:d5e1eec2689a 15 #define PWM_PIN p21
aswild 0:d5e1eec2689a 16 #define EX_CS_PIN p18
aswild 0:d5e1eec2689a 17
aswild 0:d5e1eec2689a 18 void updateSBColor(void const *args);
aswild 0:d5e1eec2689a 19
aswild 0:d5e1eec2689a 20 DigitalIn pb1(PB0_PIN);
aswild 0:d5e1eec2689a 21 DigitalOut led(LED_PIN);
aswild 0:d5e1eec2689a 22 PwmOut pwm(PWM_PIN);
aswild 0:d5e1eec2689a 23
aswild 0:d5e1eec2689a 24 SPI ex_spi(p11, p12, p13);
aswild 0:d5e1eec2689a 25 MCP23S17 ex(ex_spi, EX_CS_PIN, 0x40);
aswild 0:d5e1eec2689a 26
aswild 0:d5e1eec2689a 27 // flags set when reading/writing the SPI extender,
aswild 0:d5e1eec2689a 28 // helpful for knowing what's happening in the logic analyzer
aswild 0:d5e1eec2689a 29 DigitalOut ex_read(p24);
aswild 0:d5e1eec2689a 30 DigitalOut ex_write(p23);
aswild 0:d5e1eec2689a 31
aswild 0:d5e1eec2689a 32 ShiftBrite sb(p5, p6, p7, p8);
aswild 0:d5e1eec2689a 33 const int sbcolors[] = {0xff0000, 0xffff00, 0x00ff00, 0x00ffff, 0x0000ff, 0xff00ff};
aswild 0:d5e1eec2689a 34 int sbci = 0;
aswild 0:d5e1eec2689a 35
aswild 0:d5e1eec2689a 36 // brightness of PWM output
aswild 0:d5e1eec2689a 37 float bright = 0.0f;
aswild 0:d5e1eec2689a 38 bool pb1p = false;
aswild 0:d5e1eec2689a 39
aswild 0:d5e1eec2689a 40 int main()
aswild 0:d5e1eec2689a 41 {
aswild 0:d5e1eec2689a 42 // set extender as inputs, configure internal pullups
aswild 0:d5e1eec2689a 43 ex.direction(PORT_A, 0xFF);
aswild 0:d5e1eec2689a 44 ex.configurePullUps(PORT_A, 0x90);
aswild 0:d5e1eec2689a 45 // port B as outputs (for LED)
aswild 0:d5e1eec2689a 46 ex.direction(PORT_B, 0x00);
aswild 0:d5e1eec2689a 47
aswild 0:d5e1eec2689a 48 ex_read = 0;
aswild 0:d5e1eec2689a 49 ex_write = 0;
aswild 0:d5e1eec2689a 50
aswild 0:d5e1eec2689a 51 sb.writeInit(32, 0, 0);
aswild 0:d5e1eec2689a 52 sb.fadeColor(0, 0xff0000, 0.5);
aswild 0:d5e1eec2689a 53
aswild 0:d5e1eec2689a 54 // set PWM to 100Hz
aswild 0:d5e1eec2689a 55 pwm.period_ms(10);
aswild 0:d5e1eec2689a 56
aswild 0:d5e1eec2689a 57 // oh no, I'm multithreading this
aswild 0:d5e1eec2689a 58 // god help us all...
aswild 0:d5e1eec2689a 59 Thread sbThread(updateSBColor);
aswild 0:d5e1eec2689a 60
aswild 0:d5e1eec2689a 61 while (true)
aswild 0:d5e1eec2689a 62 {
aswild 0:d5e1eec2689a 63 // read button and turn on LED if pressed
aswild 0:d5e1eec2689a 64 pb1p = !pb1;
aswild 0:d5e1eec2689a 65 led = pb1p;
aswild 0:d5e1eec2689a 66 if (pb1p)
aswild 0:d5e1eec2689a 67 sbThread.signal_set(0x1);
aswild 0:d5e1eec2689a 68 while (!pb1);
aswild 0:d5e1eec2689a 69
aswild 0:d5e1eec2689a 70 // use pushbuttons on extender to control PWM brightness
aswild 0:d5e1eec2689a 71 // invert because active-low switches
aswild 0:d5e1eec2689a 72 ex_read = 1;
aswild 0:d5e1eec2689a 73 char edata = ~(ex.read(PORT_A));
aswild 0:d5e1eec2689a 74 ex_read = 0;
aswild 0:d5e1eec2689a 75
aswild 0:d5e1eec2689a 76 // if either button pressed, turn on ex LED
aswild 0:d5e1eec2689a 77 if (edata & 0x90)
aswild 0:d5e1eec2689a 78 {
aswild 0:d5e1eec2689a 79 ex_write = 1; // note: debugging signal only
aswild 0:d5e1eec2689a 80 ex.write(PORT_B, 1);
aswild 0:d5e1eec2689a 81 ex_write = 0;
aswild 0:d5e1eec2689a 82 }
aswild 0:d5e1eec2689a 83 else
aswild 0:d5e1eec2689a 84 {
aswild 0:d5e1eec2689a 85 ex_write = 1;
aswild 0:d5e1eec2689a 86 ex.write(PORT_B, 0);
aswild 0:d5e1eec2689a 87 ex_write = 0;
aswild 0:d5e1eec2689a 88 }
aswild 0:d5e1eec2689a 89
aswild 0:d5e1eec2689a 90 // if button 1 and below max brightness, increment by 1%
aswild 0:d5e1eec2689a 91 if ((edata&0x80) && bright < 1.0)
aswild 0:d5e1eec2689a 92 bright += 0.01;
aswild 0:d5e1eec2689a 93 // likewise for button 2 to decrement
aswild 0:d5e1eec2689a 94 if ((edata&0x10) && bright > 0)
aswild 0:d5e1eec2689a 95 bright -= 0.01;
aswild 0:d5e1eec2689a 96 pwm = bright;
aswild 0:d5e1eec2689a 97
aswild 0:d5e1eec2689a 98 Thread::wait(10);
aswild 0:d5e1eec2689a 99 }
aswild 0:d5e1eec2689a 100 }
aswild 0:d5e1eec2689a 101
aswild 0:d5e1eec2689a 102 // SB color fading happens in a different thread
aswild 0:d5e1eec2689a 103 void updateSBColor(void const *args)
aswild 0:d5e1eec2689a 104 {
aswild 0:d5e1eec2689a 105 while (true)
aswild 0:d5e1eec2689a 106 {
aswild 0:d5e1eec2689a 107 //Thread::wait(100);
aswild 0:d5e1eec2689a 108 Thread::signal_wait(0x1);
aswild 0:d5e1eec2689a 109 sb.fadeColor(sbcolors[(sbci != 0) ? sbci-1 : 5], sbcolors[sbci], 0.5);
aswild 0:d5e1eec2689a 110 if (++sbci > 5)
aswild 0:d5e1eec2689a 111 sbci = 0;
aswild 0:d5e1eec2689a 112 }
aswild 0:d5e1eec2689a 113 }