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@3:3ec443c0842a, 2012-12-05 (annotated)

Committer:
dreschpe
Date:
Wed Dec 05 08:06:20 2012 +0000
Revision:
3:3ec443c0842a
Parent:
2:a69c8c5f5b03
Child:
4:79863d2ea5a0
the lcd lib is not claiming the printf now, so we have to call LCD.printf

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
dreschpe 1:1c6a9eaf55b5 2 // Pot1 change the contrast
dreschpe 1:1c6a9eaf55b5 3 // Pot2 change 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
dreschpe 0:f6a57b843f79 13 // LCD object
dreschpe 3:3ec443c0842a 14 C12832_LCD LCD;
dreschpe 0:f6a57b843f79 15
dreschpe 1:1c6a9eaf55b5 16 AnalogIn Pot1(p19);
dreschpe 1:1c6a9eaf55b5 17 AnalogIn Pot2(p20);
dreschpe 0:f6a57b843f79 18
dreschpe 2:a69c8c5f5b03 19
dreschpe 2:a69c8c5f5b03 20 // mutex to make the lcd lib thread save
dreschpe 1:1c6a9eaf55b5 21 Mutex lcd_mutex;
dreschpe 0:f6a57b843f79 22
dreschpe 2:a69c8c5f5b03 23 // Thread 1
dreschpe 2:a69c8c5f5b03 24 // print counter into first line and wait for 1 s
dreschpe 0:f6a57b843f79 25 void thread1(void const *args)
dreschpe 0:f6a57b843f79 26 {
dreschpe 0:f6a57b843f79 27 int i;
dreschpe 0:f6a57b843f79 28 while(true) { // thread loop
dreschpe 2:a69c8c5f5b03 29 lcd_mutex.lock();
dreschpe 0:f6a57b843f79 30 LCD.locate(0,0);
dreschpe 0:f6a57b843f79 31 LCD.set_font((unsigned char*) Small_6);
dreschpe 3:3ec443c0842a 32 LCD.printf("Thread1 count: %d",i);
dreschpe 2:a69c8c5f5b03 33 lcd_mutex.unlock();
dreschpe 0:f6a57b843f79 34 i++;
dreschpe 0:f6a57b843f79 35 Thread::wait(1000);
dreschpe 0:f6a57b843f79 36 }
dreschpe 0:f6a57b843f79 37 }
dreschpe 0:f6a57b843f79 38
dreschpe 2:a69c8c5f5b03 39 // Thread 2
dreschpe 2:a69c8c5f5b03 40 // print counter into third line and wait for 0,5s
dreschpe 0:f6a57b843f79 41 void thread2(void const *args)
dreschpe 0:f6a57b843f79 42 {
dreschpe 1:1c6a9eaf55b5 43 int k;
dreschpe 0:f6a57b843f79 44 while(true) { // thread loop
dreschpe 2:a69c8c5f5b03 45 lcd_mutex.lock();
dreschpe 0:f6a57b843f79 46 LCD.locate(0,20);
dreschpe 0:f6a57b843f79 47 LCD.set_font((unsigned char*) Arial_9);
dreschpe 3:3ec443c0842a 48 LCD.printf("Thread 2 count : %d",k);
dreschpe 2:a69c8c5f5b03 49 lcd_mutex.unlock();
dreschpe 1:1c6a9eaf55b5 50 k++;
dreschpe 2:a69c8c5f5b03 51 Thread::wait(500); // wait 0.5s
dreschpe 0:f6a57b843f79 52 }
dreschpe 0:f6a57b843f79 53 }
dreschpe 0:f6a57b843f79 54
dreschpe 2:a69c8c5f5b03 55 // Thread 3
dreschpe 2:a69c8c5f5b03 56 // print a sin function in a small window
dreschpe 2:a69c8c5f5b03 57 // the value of pot 1 change the speed of the sinwave
dreschpe 2:a69c8c5f5b03 58 void thread3(void const *args)
dreschpe 1:1c6a9eaf55b5 59 {
dreschpe 1:1c6a9eaf55b5 60 int i,k,v;
dreschpe 1:1c6a9eaf55b5 61 double s,a;
dreschpe 1:1c6a9eaf55b5 62 k = 1;
dreschpe 2:a69c8c5f5b03 63 lcd_mutex.lock();
dreschpe 1:1c6a9eaf55b5 64 LCD.rect(89,0,127,17,1);
dreschpe 2:a69c8c5f5b03 65 lcd_mutex.unlock();
dreschpe 1:1c6a9eaf55b5 66 while(true) { // thread loop
dreschpe 1:1c6a9eaf55b5 67 v = Pot1.read_u16(); // get value of pot 1
dreschpe 2:a69c8c5f5b03 68 lcd_mutex.lock();
dreschpe 1:1c6a9eaf55b5 69 for (i=90; i<127; i++) {
dreschpe 2:a69c8c5f5b03 70 s = 8 * sin((long double)(i+k) /5); // pixel to print
dreschpe 2:a69c8c5f5b03 71 a = 8 * sin((long double)(i+k-1) /5); // old pixel to erase
dreschpe 2:a69c8c5f5b03 72 LCD.pixel(i,9 + (int)a ,0); // erase pixel
dreschpe 2:a69c8c5f5b03 73 LCD.pixel(i,9 + (int)s ,1); // print pixel
dreschpe 1:1c6a9eaf55b5 74 }
dreschpe 2:a69c8c5f5b03 75 LCD.copy_to_lcd(); // LCD.pixel do not update the lcd
dreschpe 2:a69c8c5f5b03 76 lcd_mutex.unlock();
dreschpe 1:1c6a9eaf55b5 77 k++;
dreschpe 2:a69c8c5f5b03 78 Thread::wait(v/100); // value of pot1 / 100
dreschpe 1:1c6a9eaf55b5 79 }
dreschpe 1:1c6a9eaf55b5 80 }
dreschpe 0:f6a57b843f79 81
dreschpe 2:a69c8c5f5b03 82 // Thread 4
dreschpe 2:a69c8c5f5b03 83 // input pot 2 and change the contrast of lcd
dreschpe 2:a69c8c5f5b03 84 void thread4(void const *args)
dreschpe 1:1c6a9eaf55b5 85 {
dreschpe 1:1c6a9eaf55b5 86 int k;
dreschpe 1:1c6a9eaf55b5 87 while(true) { // thread loop
dreschpe 1:1c6a9eaf55b5 88 k = Pot2.read_u16(); // get the value of poti 2
dreschpe 2:a69c8c5f5b03 89 k = k >> 10; // we need only 6 bit for contrast
dreschpe 2:a69c8c5f5b03 90 lcd_mutex.lock();
dreschpe 1:1c6a9eaf55b5 91 LCD.set_contrast(k);
dreschpe 2:a69c8c5f5b03 92 lcd_mutex.unlock();
dreschpe 2:a69c8c5f5b03 93 Thread::wait(500); // wait 0.5s
dreschpe 1:1c6a9eaf55b5 94 }
dreschpe 1:1c6a9eaf55b5 95 }
dreschpe 1:1c6a9eaf55b5 96
dreschpe 2:a69c8c5f5b03 97
dreschpe 2:a69c8c5f5b03 98 // print the actual contrast
dreschpe 0:f6a57b843f79 99 int main()
dreschpe 0:f6a57b843f79 100 {
dreschpe 0:f6a57b843f79 101 int j;
dreschpe 2:a69c8c5f5b03 102 LCD.cls();
dreschpe 2:a69c8c5f5b03 103
dreschpe 2:a69c8c5f5b03 104 Thread t1(thread1); //start thread1
dreschpe 2:a69c8c5f5b03 105 Thread t2(thread2); //start thread2
dreschpe 2:a69c8c5f5b03 106 Thread t3(thread3); //start thread3
dreschpe 2:a69c8c5f5b03 107 Thread t4(thread4); //start thread4
dreschpe 0:f6a57b843f79 108
dreschpe 2:a69c8c5f5b03 109 while(true) { // main is the next thread
dreschpe 2:a69c8c5f5b03 110 lcd_mutex.lock();
dreschpe 1:1c6a9eaf55b5 111 LCD.locate(0,9);
dreschpe 0:f6a57b843f79 112 LCD.set_font((unsigned char*) Small_7);
dreschpe 2:a69c8c5f5b03 113 j = LCD.get_contrast(); // read the actual contrast
dreschpe 3:3ec443c0842a 114 LCD.printf("contrast : %d",j);
dreschpe 2:a69c8c5f5b03 115 lcd_mutex.unlock();
dreschpe 2:a69c8c5f5b03 116 Thread::wait(500); // wait 0.5s
dreschpe 0:f6a57b843f79 117 }
dreschpe 1:1c6a9eaf55b5 118
dreschpe 0:f6a57b843f79 119 }