jim hamblen / Mbed 2 deprecated app-board-RTOS-Threads

This demo uses the mbed RTOS to run eight threads (including main). The threads are using different I/O devices on the application board. Several of the threads output to the LCD and an OS mutex lock is used to control access to the LCD and make the LCD thread safe.

Dependencies:   C12832_lcd LCD_fonts mbed-rtos mbed

Fork of lab1 by Peter Drescher

main.cpp@4:79863d2ea5a0, 2013-09-22 (annotated)

Committer:
4180_1
Date:
Sun Sep 22 17:57:46 2013 +0000
Revision:
4:79863d2ea5a0
Parent:
3:3ec443c0842a 
ver 1.0 see https://mbed.org/users/4180_1/notebook/mbed-application-board-hands-on-demos/

Who changed what in which revision?

UserRevisionLine numberNew contents of line
dreschpe 2:a69c8c5f5b03 1 // example to test the mbed Lab Board lcd lib with the mbed rtos
4180_1 4:79863d2ea5a0 2 // Pot1 changes the contrast
4180_1 4:79863d2ea5a0 3 // Pot2 changes the speed of the sin wave
dreschpe 1:1c6a9eaf55b5 4
dreschpe 0:f6a57b843f79 5 #include "mbed.h"
dreschpe 0:f6a57b843f79 6 #include "rtos.h"
dreschpe 0:f6a57b843f79 7 #include "Small_6.h"
dreschpe 0:f6a57b843f79 8 #include "Small_7.h"
dreschpe 0:f6a57b843f79 9 #include "Arial_9.h"
dreschpe 0:f6a57b843f79 10 #include "stdio.h"
dreschpe 1:1c6a9eaf55b5 11 #include "C12832_lcd.h"
dreschpe 0:f6a57b843f79 12
4180_1 4:79863d2ea5a0 13
dreschpe 3:3ec443c0842a 14 C12832_LCD LCD;
dreschpe 1:1c6a9eaf55b5 15 AnalogIn Pot1(p19);
dreschpe 1:1c6a9eaf55b5 16 AnalogIn Pot2(p20);
4180_1 4:79863d2ea5a0 17 PwmOut Speaker(p26);
4180_1 4:79863d2ea5a0 18 PwmOut RGBLED_r(p23);
4180_1 4:79863d2ea5a0 19 PwmOut RGBLED_g(p24);
4180_1 4:79863d2ea5a0 20 PwmOut RGBLED_b(p25);
4180_1 4:79863d2ea5a0 21 DigitalIn joyfire(p14);
4180_1 4:79863d2ea5a0 22 BusIn joy(p15,p12,p13,p16);
4180_1 4:79863d2ea5a0 23 BusOut leds(LED1,LED2,LED3,LED4);
dreschpe 2:a69c8c5f5b03 24
4180_1 4:79863d2ea5a0 25 // mutex to make the lcd lib thread safe
dreschpe 1:1c6a9eaf55b5 26 Mutex lcd_mutex;
dreschpe 0:f6a57b843f79 27
dreschpe 2:a69c8c5f5b03 28 // Thread 1
dreschpe 2:a69c8c5f5b03 29 // print counter into first line and wait for 1 s
dreschpe 0:f6a57b843f79 30 void thread1(void const *args)
dreschpe 0:f6a57b843f79 31 {
dreschpe 0:f6a57b843f79 32 int i;
dreschpe 0:f6a57b843f79 33 while(true) { // thread loop
dreschpe 2:a69c8c5f5b03 34 lcd_mutex.lock();
dreschpe 0:f6a57b843f79 35 LCD.locate(0,0);
dreschpe 0:f6a57b843f79 36 LCD.set_font((unsigned char*) Small_6);
dreschpe 3:3ec443c0842a 37 LCD.printf("Thread1 count: %d",i);
dreschpe 2:a69c8c5f5b03 38 lcd_mutex.unlock();
dreschpe 0:f6a57b843f79 39 i++;
dreschpe 0:f6a57b843f79 40 Thread::wait(1000);
dreschpe 0:f6a57b843f79 41 }
dreschpe 0:f6a57b843f79 42 }
dreschpe 0:f6a57b843f79 43
dreschpe 2:a69c8c5f5b03 44 // Thread 2
dreschpe 2:a69c8c5f5b03 45 // print counter into third line and wait for 0,5s
dreschpe 0:f6a57b843f79 46 void thread2(void const *args)
dreschpe 0:f6a57b843f79 47 {
dreschpe 1:1c6a9eaf55b5 48 int k;
dreschpe 0:f6a57b843f79 49 while(true) { // thread loop
dreschpe 2:a69c8c5f5b03 50 lcd_mutex.lock();
dreschpe 0:f6a57b843f79 51 LCD.locate(0,20);
dreschpe 0:f6a57b843f79 52 LCD.set_font((unsigned char*) Arial_9);
dreschpe 3:3ec443c0842a 53 LCD.printf("Thread 2 count : %d",k);
dreschpe 2:a69c8c5f5b03 54 lcd_mutex.unlock();
dreschpe 1:1c6a9eaf55b5 55 k++;
dreschpe 2:a69c8c5f5b03 56 Thread::wait(500); // wait 0.5s
dreschpe 0:f6a57b843f79 57 }
dreschpe 0:f6a57b843f79 58 }
dreschpe 0:f6a57b843f79 59
dreschpe 2:a69c8c5f5b03 60 // Thread 3
dreschpe 2:a69c8c5f5b03 61 // print a sin function in a small window
4180_1 4:79863d2ea5a0 62 // the value of pot 1 changes the speed of the sine wave
dreschpe 2:a69c8c5f5b03 63 void thread3(void const *args)
dreschpe 1:1c6a9eaf55b5 64 {
dreschpe 1:1c6a9eaf55b5 65 int i,k,v;
dreschpe 1:1c6a9eaf55b5 66 double s,a;
dreschpe 1:1c6a9eaf55b5 67 k = 1;
dreschpe 2:a69c8c5f5b03 68 lcd_mutex.lock();
dreschpe 1:1c6a9eaf55b5 69 LCD.rect(89,0,127,17,1);
dreschpe 2:a69c8c5f5b03 70 lcd_mutex.unlock();
dreschpe 1:1c6a9eaf55b5 71 while(true) { // thread loop
dreschpe 1:1c6a9eaf55b5 72 v = Pot1.read_u16(); // get value of pot 1
dreschpe 2:a69c8c5f5b03 73 lcd_mutex.lock();
4180_1 4:79863d2ea5a0 74 for (i=90; i<127; i++) {
4180_1 4:79863d2ea5a0 75 s = 8 * sin((long double)(i+k) /5); // pixel to print
dreschpe 2:a69c8c5f5b03 76 a = 8 * sin((long double)(i+k-1) /5); // old pixel to erase
4180_1 4:79863d2ea5a0 77 LCD.pixel(i,9 + (int)a ,0); // erase pixel
4180_1 4:79863d2ea5a0 78 LCD.pixel(i,9 + (int)s ,1); // print pixel
dreschpe 1:1c6a9eaf55b5 79 }
4180_1 4:79863d2ea5a0 80 LCD.copy_to_lcd(); // LCD.pixel does not update the lcd
dreschpe 2:a69c8c5f5b03 81 lcd_mutex.unlock();
dreschpe 1:1c6a9eaf55b5 82 k++;
dreschpe 2:a69c8c5f5b03 83 Thread::wait(v/100); // value of pot1 / 100
dreschpe 1:1c6a9eaf55b5 84 }
dreschpe 1:1c6a9eaf55b5 85 }
dreschpe 0:f6a57b843f79 86
dreschpe 2:a69c8c5f5b03 87 // Thread 4
4180_1 4:79863d2ea5a0 88 // input pot 2 and change the contrast of LCD
dreschpe 2:a69c8c5f5b03 89 void thread4(void const *args)
dreschpe 1:1c6a9eaf55b5 90 {
dreschpe 1:1c6a9eaf55b5 91 int k;
dreschpe 1:1c6a9eaf55b5 92 while(true) { // thread loop
4180_1 4:79863d2ea5a0 93 k = Pot2.read_u16(); // get the value of poti 2
4180_1 4:79863d2ea5a0 94 k = k >> 10; // need only 6 bits for contrast
4180_1 4:79863d2ea5a0 95 lcd_mutex.lock();
4180_1 4:79863d2ea5a0 96 LCD.set_contrast(k);
4180_1 4:79863d2ea5a0 97 lcd_mutex.unlock();
4180_1 4:79863d2ea5a0 98 Thread::wait(500); // wait 0.5s
4180_1 4:79863d2ea5a0 99 }
4180_1 4:79863d2ea5a0 100 }
4180_1 4:79863d2ea5a0 101 // Thread 5
4180_1 4:79863d2ea5a0 102 // RGB LED
4180_1 4:79863d2ea5a0 103 void thread5(void const *args)
4180_1 4:79863d2ea5a0 104 {
4180_1 4:79863d2ea5a0 105 while(true) { // thread loop
4180_1 4:79863d2ea5a0 106 RGBLED_r = 0.5 + (rand() % 11)/20.0;
4180_1 4:79863d2ea5a0 107 RGBLED_g = 0.5 + (rand() % 11)/20.0;
4180_1 4:79863d2ea5a0 108 RGBLED_b = 0.5 + (rand() % 11)/20.0;
4180_1 4:79863d2ea5a0 109 Thread::wait(1667); // wait 1.5s
4180_1 4:79863d2ea5a0 110 }
dreschpe 1:1c6a9eaf55b5 111 }
4180_1 4:79863d2ea5a0 112 // Thread 6
4180_1 4:79863d2ea5a0 113 // Speaker
4180_1 4:79863d2ea5a0 114 void thread6(void const *args)
4180_1 4:79863d2ea5a0 115 {
4180_1 4:79863d2ea5a0 116 while(true) { // thread loop
4180_1 4:79863d2ea5a0 117 Speaker.period(1.0/800.0);
4180_1 4:79863d2ea5a0 118 Speaker = 0.01;
4180_1 4:79863d2ea5a0 119 Thread::wait(1000); // wait 1.0s
4180_1 4:79863d2ea5a0 120 Speaker.period(1.0/969.0);
4180_1 4:79863d2ea5a0 121 Speaker = 0.01;
4180_1 4:79863d2ea5a0 122 Thread::wait(1000); // wait 1.0s
4180_1 4:79863d2ea5a0 123 }
4180_1 4:79863d2ea5a0 124 }
4180_1 4:79863d2ea5a0 125
4180_1 4:79863d2ea5a0 126 // Thread 7
4180_1 4:79863d2ea5a0 127 // Joystick controls onboard mbed LEDs
4180_1 4:79863d2ea5a0 128 void thread7(void const *args)
4180_1 4:79863d2ea5a0 129 {
4180_1 4:79863d2ea5a0 130 while(true) { // thread loop
4180_1 4:79863d2ea5a0 131 if (joyfire) {
4180_1 4:79863d2ea5a0 132 leds = 0xf;
4180_1 4:79863d2ea5a0 133 } else {
4180_1 4:79863d2ea5a0 134 leds = joy;
4180_1 4:79863d2ea5a0 135 }
4180_1 4:79863d2ea5a0 136 Thread::wait(200); // wait 0.25s
4180_1 4:79863d2ea5a0 137 }
dreschpe 1:1c6a9eaf55b5 138 }
dreschpe 1:1c6a9eaf55b5 139
dreschpe 2:a69c8c5f5b03 140
4180_1 4:79863d2ea5a0 141
dreschpe 0:f6a57b843f79 142 int main()
dreschpe 0:f6a57b843f79 143 {
dreschpe 0:f6a57b843f79 144 int j;
dreschpe 2:a69c8c5f5b03 145 LCD.cls();
4180_1 4:79863d2ea5a0 146
dreschpe 2:a69c8c5f5b03 147 Thread t1(thread1); //start thread1
dreschpe 2:a69c8c5f5b03 148 Thread t2(thread2); //start thread2
dreschpe 2:a69c8c5f5b03 149 Thread t3(thread3); //start thread3
dreschpe 2:a69c8c5f5b03 150 Thread t4(thread4); //start thread4
4180_1 4:79863d2ea5a0 151 Thread t5(thread5); //start thread5
4180_1 4:79863d2ea5a0 152 Thread t6(thread6); //start thread6
4180_1 4:79863d2ea5a0 153 Thread t7(thread7); //start thread7
dreschpe 0:f6a57b843f79 154
dreschpe 2:a69c8c5f5b03 155 while(true) { // main is the next thread
dreschpe 2:a69c8c5f5b03 156 lcd_mutex.lock();
dreschpe 1:1c6a9eaf55b5 157 LCD.locate(0,9);
dreschpe 0:f6a57b843f79 158 LCD.set_font((unsigned char*) Small_7);
dreschpe 2:a69c8c5f5b03 159 j = LCD.get_contrast(); // read the actual contrast
dreschpe 3:3ec443c0842a 160 LCD.printf("contrast : %d",j);
dreschpe 2:a69c8c5f5b03 161 lcd_mutex.unlock();
dreschpe 2:a69c8c5f5b03 162 Thread::wait(500); // wait 0.5s
dreschpe 0:f6a57b843f79 163 }
dreschpe 0:f6a57b843f79 164 }