Dream Team / Mbed 2 deprecated Lab1_BasicIO

Lab that has to do with basic IO on mbed.

Dependencies:   DebounceIn mbed PinDetect

GeorgesLab1/GeorgeMain.cpp@47:0efd125c7f2d, 2016-01-23 (annotated)

Committer:
gtzintzarov3
Date:
Sat Jan 23 06:44:49 2016 +0000
Revision:
47:0efd125c7f2d
Child:
49:f2081d0f5eec
GT: Watchdog timer added, assembly language added

Who changed what in which revision?

UserRevisionLine numberNew contents of line
gtzintzarov3 47:0efd125c7f2d 1 /*
gtzintzarov3 47:0efd125c7f2d 2 #include "mbed.h"
gtzintzarov3 47:0efd125c7f2d 3 #include "DebounceIn.h"
gtzintzarov3 47:0efd125c7f2d 4 #include "PinDetect.h"
gtzintzarov3 47:0efd125c7f2d 5 #include <algorithm>
gtzintzarov3 47:0efd125c7f2d 6 #include "math.h"
gtzintzarov3 47:0efd125c7f2d 7 using namespace std;
gtzintzarov3 47:0efd125c7f2d 8
gtzintzarov3 47:0efd125c7f2d 9
gtzintzarov3 47:0efd125c7f2d 10 PinDetect pb(p20);
gtzintzarov3 47:0efd125c7f2d 11 DigitalOut myled1(LED1);
gtzintzarov3 47:0efd125c7f2d 12 DigitalOut myled2(LED2);
gtzintzarov3 47:0efd125c7f2d 13 DigitalOut myled3(LED3);
gtzintzarov3 47:0efd125c7f2d 14 DigitalOut myled4(LED4);
gtzintzarov3 47:0efd125c7f2d 15 PwmOut discrete_led(p21);
gtzintzarov3 47:0efd125c7f2d 16 AnalogIn voltage_reg(p17);
gtzintzarov3 47:0efd125c7f2d 17
gtzintzarov3 47:0efd125c7f2d 18 DigitalOut latch(p15);
gtzintzarov3 47:0efd125c7f2d 19 SPI spi(p11, p12, p13);
gtzintzarov3 47:0efd125c7f2d 20
gtzintzarov3 47:0efd125c7f2d 21 int RGB_val[3] = {0,0,0};
gtzintzarov3 47:0efd125c7f2d 22
gtzintzarov3 47:0efd125c7f2d 23 void RGB_intensity(float voltage) {
gtzintzarov3 47:0efd125c7f2d 24 float min_ = 0;
gtzintzarov3 47:0efd125c7f2d 25 float max_ = 1000;
gtzintzarov3 47:0efd125c7f2d 26 float ratio = 2 * (voltage-min_)/(max_-min_);
gtzintzarov3 47:0efd125c7f2d 27 float b = max(float(0), 1000*(1-ratio));
gtzintzarov3 47:0efd125c7f2d 28 float r = max(float(0), 1000*(ratio-1));
gtzintzarov3 47:0efd125c7f2d 29 float g = float(1000) - b - r;
gtzintzarov3 47:0efd125c7f2d 30 if (r<0) {r=0;}
gtzintzarov3 47:0efd125c7f2d 31 if (g<0) {g=0;}
gtzintzarov3 47:0efd125c7f2d 32 if (b<0) {b=0;}
gtzintzarov3 47:0efd125c7f2d 33 RGB_val[0] = int(r);
gtzintzarov3 47:0efd125c7f2d 34 RGB_val[1] = int(g);
gtzintzarov3 47:0efd125c7f2d 35 RGB_val[2] = int(b);
gtzintzarov3 47:0efd125c7f2d 36 }
gtzintzarov3 47:0efd125c7f2d 37
gtzintzarov3 47:0efd125c7f2d 38 void RGB_LED(int red, int green, int blue) {
gtzintzarov3 47:0efd125c7f2d 39 unsigned int overallColor = 0;
gtzintzarov3 47:0efd125c7f2d 40 unsigned short int MSB = 0;
gtzintzarov3 47:0efd125c7f2d 41 unsigned short int LSB = 0;
gtzintzarov3 47:0efd125c7f2d 42 overallColor = (((blue<<10)|red)<<10)|(green);
gtzintzarov3 47:0efd125c7f2d 43 MSB = (overallColor>>16);
gtzintzarov3 47:0efd125c7f2d 44 LSB = overallColor;
gtzintzarov3 47:0efd125c7f2d 45 spi.write(MSB);
gtzintzarov3 47:0efd125c7f2d 46 spi.write(LSB);
gtzintzarov3 47:0efd125c7f2d 47 latch=1;
gtzintzarov3 47:0efd125c7f2d 48 latch=0;
gtzintzarov3 47:0efd125c7f2d 49 }
gtzintzarov3 47:0efd125c7f2d 50
gtzintzarov3 47:0efd125c7f2d 51 class Watchdog {
gtzintzarov3 47:0efd125c7f2d 52 public:
gtzintzarov3 47:0efd125c7f2d 53 // Load timeout value in watchdog timer and enable
gtzintzarov3 47:0efd125c7f2d 54 void kick(float s) {
gtzintzarov3 47:0efd125c7f2d 55 LPC_WDT->WDCLKSEL = 0x1; // Set CLK src to PCLK
gtzintzarov3 47:0efd125c7f2d 56 uint32_t clk = SystemCoreClock / 16; // WD has a fixed /4 prescaler, PCLK default is /4
gtzintzarov3 47:0efd125c7f2d 57 LPC_WDT->WDTC = s * (float)clk;
gtzintzarov3 47:0efd125c7f2d 58 LPC_WDT->WDMOD = 0x3; // Enabled and Reset
gtzintzarov3 47:0efd125c7f2d 59 kick();
gtzintzarov3 47:0efd125c7f2d 60 }
gtzintzarov3 47:0efd125c7f2d 61 // "kick" or "feed" the dog - reset the watchdog timer
gtzintzarov3 47:0efd125c7f2d 62 // by writing this required bit pattern
gtzintzarov3 47:0efd125c7f2d 63 void kick() {
gtzintzarov3 47:0efd125c7f2d 64 LPC_WDT->WDFEED = 0xAA;
gtzintzarov3 47:0efd125c7f2d 65 LPC_WDT->WDFEED = 0x55;
gtzintzarov3 47:0efd125c7f2d 66 }
gtzintzarov3 47:0efd125c7f2d 67 };
gtzintzarov3 47:0efd125c7f2d 68
gtzintzarov3 47:0efd125c7f2d 69
gtzintzarov3 47:0efd125c7f2d 70 Watchdog wdt;
gtzintzarov3 47:0efd125c7f2d 71
gtzintzarov3 47:0efd125c7f2d 72 int main() {
gtzintzarov3 47:0efd125c7f2d 73
gtzintzarov3 47:0efd125c7f2d 74 float brightness = 0;
gtzintzarov3 47:0efd125c7f2d 75 pb.mode(PullUp);
gtzintzarov3 47:0efd125c7f2d 76
gtzintzarov3 47:0efd125c7f2d 77 if (pb) {
gtzintzarov3 47:0efd125c7f2d 78 spi.format(16,0);
gtzintzarov3 47:0efd125c7f2d 79 spi.frequency(1000000);
gtzintzarov3 47:0efd125c7f2d 80 latch=0;
gtzintzarov3 47:0efd125c7f2d 81 wait(2);
gtzintzarov3 47:0efd125c7f2d 82 while(1) {
gtzintzarov3 47:0efd125c7f2d 83 //code for red led
gtzintzarov3 47:0efd125c7f2d 84 brightness = voltage_reg;
gtzintzarov3 47:0efd125c7f2d 85 myled1 = !pb;
gtzintzarov3 47:0efd125c7f2d 86 if (!pb) {
gtzintzarov3 47:0efd125c7f2d 87 discrete_led.write(brightness);
gtzintzarov3 47:0efd125c7f2d 88 }
gtzintzarov3 47:0efd125c7f2d 89 else{
gtzintzarov3 47:0efd125c7f2d 90 discrete_led.write(0);
gtzintzarov3 47:0efd125c7f2d 91 }
gtzintzarov3 47:0efd125c7f2d 92
gtzintzarov3 47:0efd125c7f2d 93 //code for multicolor led
gtzintzarov3 47:0efd125c7f2d 94 float heatmapColor = voltage_reg.read()*float(1000);
gtzintzarov3 47:0efd125c7f2d 95 if (heatmapColor < 0) {heatmapColor=0;}
gtzintzarov3 47:0efd125c7f2d 96 RGB_intensity(heatmapColor);
gtzintzarov3 47:0efd125c7f2d 97 RGB_LED(RGB_val[0], RGB_val[1], RGB_val[2]);
gtzintzarov3 47:0efd125c7f2d 98 //wait(.2);
gtzintzarov3 47:0efd125c7f2d 99 }
gtzintzarov3 47:0efd125c7f2d 100
gtzintzarov3 47:0efd125c7f2d 101 }
gtzintzarov3 47:0efd125c7f2d 102 else {
gtzintzarov3 47:0efd125c7f2d 103 int count = 0;
gtzintzarov3 47:0efd125c7f2d 104 // On reset, indicate a watchdog reset or a pushbutton reset on LED 4 or 3
gtzintzarov3 47:0efd125c7f2d 105 if ((LPC_WDT->WDMOD >> 2) & 1)
gtzintzarov3 47:0efd125c7f2d 106 myled4 = 1; else myled3 = 1;
gtzintzarov3 47:0efd125c7f2d 107
gtzintzarov3 47:0efd125c7f2d 108 // setup a 10 second timeout on watchdog timer hardware
gtzintzarov3 47:0efd125c7f2d 109 // needs to be longer than worst case main loop exection time
gtzintzarov3 47:0efd125c7f2d 110 wdt.kick(10.0);
gtzintzarov3 47:0efd125c7f2d 111
gtzintzarov3 47:0efd125c7f2d 112 // Main program loop - resets watchdog once each loop iteration
gtzintzarov3 47:0efd125c7f2d 113 // Would typically have a lot of code in loop with many calls
gtzintzarov3 47:0efd125c7f2d 114 while (1) {
gtzintzarov3 47:0efd125c7f2d 115 myled1 = 1; //Flash LEDs 1 & 2 to indicate normal loop activity
gtzintzarov3 47:0efd125c7f2d 116 wait(.05);
gtzintzarov3 47:0efd125c7f2d 117 myled1 = 0;
gtzintzarov3 47:0efd125c7f2d 118 myled2 = 1;
gtzintzarov3 47:0efd125c7f2d 119 wait(.05);
gtzintzarov3 47:0efd125c7f2d 120 // Simulate a fault lock up with an infinite while loop, but only after 25 loop iterations
gtzintzarov3 47:0efd125c7f2d 121 if (count == 25) while (1) {};
gtzintzarov3 47:0efd125c7f2d 122 // LED 2 will stay on during the fault
gtzintzarov3 47:0efd125c7f2d 123 myled2 = 0;
gtzintzarov3 47:0efd125c7f2d 124 count ++;
gtzintzarov3 47:0efd125c7f2d 125 // End of main loop so "kick" to reset watchdog timer and avoid a reset
gtzintzarov3 47:0efd125c7f2d 126 wdt.kick();
gtzintzarov3 47:0efd125c7f2d 127 }
gtzintzarov3 47:0efd125c7f2d 128 }
gtzintzarov3 47:0efd125c7f2d 129 }
gtzintzarov3 47:0efd125c7f2d 130 // */