Chris Talbot
A very simple example of an RTOS executing on an LPC1768 Platform
Fork of
app-board-RTOS-Threads
by 
jim hamblen
main.cpp@6:7f833d7ef195, 2016-08-08 (annotated)
- Committer:
- TheFella
- Date:
- Mon Aug 08 02:54:39 2016 +0000
- Revision:
- 6:7f833d7ef195
- Parent:
- 5:d6da74ac1cc3
- Child:
- 7:ea9f0cd97179
Who changed what in which revision?
| User | Revision | Line number | New 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 "stdio.h" |
| dreschpe | 0:f6a57b843f79 | 8 | |
| TheFella | 5:d6da74ac1cc3 | 9 | #define LEDON 1 |
| TheFella | 5:d6da74ac1cc3 | 10 | #define LEDOFF 0 |
| 4180_1 | 4:79863d2ea5a0 | 11 | |
| TheFella | 5:d6da74ac1cc3 | 12 | |
| TheFella | 5:d6da74ac1cc3 | 13 | Serial pc(USBTX, USBRX); |
| dreschpe | 1:1c6a9eaf55b5 | 14 | AnalogIn Pot1(p19); |
| dreschpe | 1:1c6a9eaf55b5 | 15 | AnalogIn Pot2(p20); |
| TheFella | 5:d6da74ac1cc3 | 16 | DigitalOut led1(LED1); |
| TheFella | 5:d6da74ac1cc3 | 17 | DigitalOut led2(LED2); |
| dreschpe | 2:a69c8c5f5b03 | 18 | |
| TheFella | 5:d6da74ac1cc3 | 19 | |
| TheFella | 5:d6da74ac1cc3 | 20 | // mutex to make the serial thread safe |
| TheFella | 5:d6da74ac1cc3 | 21 | Mutex pc_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 |
| TheFella | 5:d6da74ac1cc3 | 29 | pc_mutex.lock(); |
| TheFella | 5:d6da74ac1cc3 | 30 | pc.printf("Thread1 count: %d\n\r",i); |
| TheFella | 5:d6da74ac1cc3 | 31 | pc_mutex.unlock(); |
| dreschpe | 0:f6a57b843f79 | 32 | i++; |
| dreschpe | 0:f6a57b843f79 | 33 | Thread::wait(1000); |
| dreschpe | 0:f6a57b843f79 | 34 | } |
| dreschpe | 0:f6a57b843f79 | 35 | } |
| dreschpe | 0:f6a57b843f79 | 36 | |
| dreschpe | 2:a69c8c5f5b03 | 37 | // Thread 2 |
| dreschpe | 2:a69c8c5f5b03 | 38 | // print counter into third line and wait for 0,5s |
| dreschpe | 0:f6a57b843f79 | 39 | void thread2(void const *args) |
| dreschpe | 0:f6a57b843f79 | 40 | { |
| dreschpe | 1:1c6a9eaf55b5 | 41 | int k; |
| dreschpe | 0:f6a57b843f79 | 42 | while(true) { // thread loop |
| TheFella | 5:d6da74ac1cc3 | 43 | pc_mutex.lock(); |
| TheFella | 5:d6da74ac1cc3 | 44 | pc.printf("Thread 2 count : %d\n\r",k); |
| TheFella | 5:d6da74ac1cc3 | 45 | pc_mutex.unlock(); |
| dreschpe | 1:1c6a9eaf55b5 | 46 | k++; |
| dreschpe | 2:a69c8c5f5b03 | 47 | Thread::wait(500); // wait 0.5s |
| dreschpe | 0:f6a57b843f79 | 48 | } |
| dreschpe | 0:f6a57b843f79 | 49 | } |
| dreschpe | 0:f6a57b843f79 | 50 | |
| dreschpe | 2:a69c8c5f5b03 | 51 | // Thread 4 |
| TheFella | 5:d6da74ac1cc3 | 52 | // the value of pot 1 changes the DC of LED1 |
| dreschpe | 2:a69c8c5f5b03 | 53 | void thread4(void const *args) |
| dreschpe | 1:1c6a9eaf55b5 | 54 | { |
| TheFella | 5:d6da74ac1cc3 | 55 | while(true) { // thread loop |
| TheFella | 5:d6da74ac1cc3 | 56 | pc_mutex.lock(); |
| TheFella | 5:d6da74ac1cc3 | 57 | if( Pot1.read_u16() > 0xEFFF) |
| TheFella | 5:d6da74ac1cc3 | 58 | { |
| TheFella | 5:d6da74ac1cc3 | 59 | led1 = LEDON; |
| TheFella | 5:d6da74ac1cc3 | 60 | } |
| TheFella | 5:d6da74ac1cc3 | 61 | else |
| TheFella | 5:d6da74ac1cc3 | 62 | { |
| TheFella | 5:d6da74ac1cc3 | 63 | led1 = LEDOFF; |
| TheFella | 5:d6da74ac1cc3 | 64 | } |
| TheFella | 5:d6da74ac1cc3 | 65 | |
| TheFella | 5:d6da74ac1cc3 | 66 | pc_mutex.unlock(); |
| 4180_1 | 4:79863d2ea5a0 | 67 | } |
| TheFella | 5:d6da74ac1cc3 | 68 | Thread::wait(500); // value of pot1 / 100 |
| 4180_1 | 4:79863d2ea5a0 | 69 | } |
| TheFella | 5:d6da74ac1cc3 | 70 | |
| 4180_1 | 4:79863d2ea5a0 | 71 | // Thread 5 |
| TheFella | 5:d6da74ac1cc3 | 72 | // the value of pot 2 changes the DC of LED2 |
| 4180_1 | 4:79863d2ea5a0 | 73 | void thread5(void const *args) |
| 4180_1 | 4:79863d2ea5a0 | 74 | { |
| TheFella | 5:d6da74ac1cc3 | 75 | while(true) { // thread loop |
| TheFella | 5:d6da74ac1cc3 | 76 | pc_mutex.lock(); |
| TheFella | 5:d6da74ac1cc3 | 77 | if( Pot2.read_u16() > 0xEFFF) |
| TheFella | 5:d6da74ac1cc3 | 78 | { |
| TheFella | 5:d6da74ac1cc3 | 79 | led2 = LEDON; |
| TheFella | 5:d6da74ac1cc3 | 80 | } |
| TheFella | 5:d6da74ac1cc3 | 81 | else |
| TheFella | 5:d6da74ac1cc3 | 82 | { |
| TheFella | 5:d6da74ac1cc3 | 83 | led2 = LEDOFF; |
| TheFella | 5:d6da74ac1cc3 | 84 | } |
| TheFella | 5:d6da74ac1cc3 | 85 | |
| TheFella | 5:d6da74ac1cc3 | 86 | pc_mutex.unlock(); |
| 4180_1 | 4:79863d2ea5a0 | 87 | } |
| TheFella | 5:d6da74ac1cc3 | 88 | Thread::wait(500); // value of pot1 / 100 |
| dreschpe | 1:1c6a9eaf55b5 | 89 | } |
| 4180_1 | 4:79863d2ea5a0 | 90 | |
| dreschpe | 0:f6a57b843f79 | 91 | int main() |
| dreschpe | 0:f6a57b843f79 | 92 | { |
| dreschpe | 2:a69c8c5f5b03 | 93 | Thread t1(thread1); //start thread1 |
| dreschpe | 2:a69c8c5f5b03 | 94 | Thread t2(thread2); //start thread2 |
| dreschpe | 2:a69c8c5f5b03 | 95 | Thread t4(thread4); //start thread4 |
| 4180_1 | 4:79863d2ea5a0 | 96 | Thread t5(thread5); //start thread5 |
| TheFella | 5:d6da74ac1cc3 | 97 | |
| dreschpe | 2:a69c8c5f5b03 | 98 | while(true) { // main is the next thread |
| TheFella | 5:d6da74ac1cc3 | 99 | pc_mutex.lock(); |
| TheFella | 5:d6da74ac1cc3 | 100 | pc_mutex.unlock(); |
| dreschpe | 2:a69c8c5f5b03 | 101 | Thread::wait(500); // wait 0.5s |
| dreschpe | 0:f6a57b843f79 | 102 | } |
| dreschpe | 0:f6a57b843f79 | 103 | } |