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@8:261f8af23dae, 2016-08-08 (annotated)
- Committer:
- TheFella
- Date:
- Mon Aug 08 14:55:12 2016 +0000
- Revision:
- 8:261f8af23dae
- Parent:
- 7:ea9f0cd97179
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| TheFella | 8:261f8af23dae | 1 | // Example using mbedRTOS on the LPC1768 |
| TheFella | 8:261f8af23dae | 2 | // Introduction to RTOS |
| TheFella | 7:ea9f0cd97179 | 3 | // Pot1 ADC limit for LED1 |
| TheFella | 7:ea9f0cd97179 | 4 | // Pot2 ADC limit for LED2 |
| dreschpe | 1:1c6a9eaf55b5 | 5 | |
| dreschpe | 0:f6a57b843f79 | 6 | #include "mbed.h" |
| dreschpe | 0:f6a57b843f79 | 7 | #include "rtos.h" |
| dreschpe | 0:f6a57b843f79 | 8 | #include "stdio.h" |
| dreschpe | 0:f6a57b843f79 | 9 | |
| TheFella | 5:d6da74ac1cc3 | 10 | #define LEDON 1 |
| TheFella | 5:d6da74ac1cc3 | 11 | #define LEDOFF 0 |
| 4180_1 | 4:79863d2ea5a0 | 12 | |
| TheFella | 5:d6da74ac1cc3 | 13 | |
| TheFella | 5:d6da74ac1cc3 | 14 | Serial pc(USBTX, USBRX); |
| dreschpe | 1:1c6a9eaf55b5 | 15 | AnalogIn Pot1(p19); |
| dreschpe | 1:1c6a9eaf55b5 | 16 | AnalogIn Pot2(p20); |
| TheFella | 5:d6da74ac1cc3 | 17 | DigitalOut led1(LED1); |
| TheFella | 5:d6da74ac1cc3 | 18 | DigitalOut led2(LED2); |
| dreschpe | 2:a69c8c5f5b03 | 19 | |
| TheFella | 5:d6da74ac1cc3 | 20 | |
| TheFella | 5:d6da74ac1cc3 | 21 | // mutex to make the serial thread safe |
| TheFella | 5:d6da74ac1cc3 | 22 | Mutex pc_mutex; |
| dreschpe | 0:f6a57b843f79 | 23 | |
| dreschpe | 2:a69c8c5f5b03 | 24 | // Thread 1 |
| dreschpe | 2:a69c8c5f5b03 | 25 | // print counter into first line and wait for 1 s |
| dreschpe | 0:f6a57b843f79 | 26 | void thread1(void const *args) |
| dreschpe | 0:f6a57b843f79 | 27 | { |
| dreschpe | 0:f6a57b843f79 | 28 | int i; |
| TheFella | 8:261f8af23dae | 29 | while(true) |
| TheFella | 8:261f8af23dae | 30 | { // thread loop |
| TheFella | 5:d6da74ac1cc3 | 31 | pc_mutex.lock(); |
| TheFella | 5:d6da74ac1cc3 | 32 | pc.printf("Thread1 count: %d\n\r",i); |
| TheFella | 5:d6da74ac1cc3 | 33 | pc_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; |
| TheFella | 8:261f8af23dae | 44 | while(true) |
| TheFella | 8:261f8af23dae | 45 | { // thread loop |
| TheFella | 5:d6da74ac1cc3 | 46 | pc_mutex.lock(); |
| TheFella | 5:d6da74ac1cc3 | 47 | pc.printf("Thread 2 count : %d\n\r",k); |
| TheFella | 5:d6da74ac1cc3 | 48 | pc_mutex.unlock(); |
| dreschpe | 1:1c6a9eaf55b5 | 49 | k++; |
| dreschpe | 2:a69c8c5f5b03 | 50 | Thread::wait(500); // wait 0.5s |
| dreschpe | 0:f6a57b843f79 | 51 | } |
| dreschpe | 0:f6a57b843f79 | 52 | } |
| dreschpe | 0:f6a57b843f79 | 53 | |
| dreschpe | 2:a69c8c5f5b03 | 54 | // Thread 4 |
| TheFella | 8:261f8af23dae | 55 | // Pot1's value is compared to a limit and LED1 is set or not |
| dreschpe | 2:a69c8c5f5b03 | 56 | void thread4(void const *args) |
| dreschpe | 1:1c6a9eaf55b5 | 57 | { |
| TheFella | 8:261f8af23dae | 58 | while(true) |
| TheFella | 8:261f8af23dae | 59 | { // thread loop |
| TheFella | 5:d6da74ac1cc3 | 60 | pc_mutex.lock(); |
| TheFella | 5:d6da74ac1cc3 | 61 | if( Pot1.read_u16() > 0xEFFF) |
| TheFella | 5:d6da74ac1cc3 | 62 | { |
| TheFella | 5:d6da74ac1cc3 | 63 | led1 = LEDON; |
| TheFella | 5:d6da74ac1cc3 | 64 | } |
| TheFella | 5:d6da74ac1cc3 | 65 | else |
| TheFella | 5:d6da74ac1cc3 | 66 | { |
| TheFella | 5:d6da74ac1cc3 | 67 | led1 = LEDOFF; |
| TheFella | 5:d6da74ac1cc3 | 68 | } |
| TheFella | 5:d6da74ac1cc3 | 69 | |
| TheFella | 5:d6da74ac1cc3 | 70 | pc_mutex.unlock(); |
| 4180_1 | 4:79863d2ea5a0 | 71 | } |
| TheFella | 5:d6da74ac1cc3 | 72 | Thread::wait(500); // value of pot1 / 100 |
| 4180_1 | 4:79863d2ea5a0 | 73 | } |
| TheFella | 5:d6da74ac1cc3 | 74 | |
| 4180_1 | 4:79863d2ea5a0 | 75 | // Thread 5 |
| TheFella | 8:261f8af23dae | 76 | // Pot2's value is compared to a limit and LED2 is set or not |
| 4180_1 | 4:79863d2ea5a0 | 77 | void thread5(void const *args) |
| 4180_1 | 4:79863d2ea5a0 | 78 | { |
| TheFella | 8:261f8af23dae | 79 | while(true) |
| TheFella | 8:261f8af23dae | 80 | { // thread loop |
| TheFella | 5:d6da74ac1cc3 | 81 | pc_mutex.lock(); |
| TheFella | 5:d6da74ac1cc3 | 82 | if( Pot2.read_u16() > 0xEFFF) |
| TheFella | 5:d6da74ac1cc3 | 83 | { |
| TheFella | 5:d6da74ac1cc3 | 84 | led2 = LEDON; |
| TheFella | 5:d6da74ac1cc3 | 85 | } |
| TheFella | 5:d6da74ac1cc3 | 86 | else |
| TheFella | 5:d6da74ac1cc3 | 87 | { |
| TheFella | 5:d6da74ac1cc3 | 88 | led2 = LEDOFF; |
| TheFella | 5:d6da74ac1cc3 | 89 | } |
| TheFella | 5:d6da74ac1cc3 | 90 | |
| TheFella | 5:d6da74ac1cc3 | 91 | pc_mutex.unlock(); |
| 4180_1 | 4:79863d2ea5a0 | 92 | } |
| TheFella | 5:d6da74ac1cc3 | 93 | Thread::wait(500); // value of pot1 / 100 |
| dreschpe | 1:1c6a9eaf55b5 | 94 | } |
| 4180_1 | 4:79863d2ea5a0 | 95 | |
| dreschpe | 0:f6a57b843f79 | 96 | int main() |
| dreschpe | 0:f6a57b843f79 | 97 | { |
| dreschpe | 2:a69c8c5f5b03 | 98 | Thread t1(thread1); //start thread1 |
| dreschpe | 2:a69c8c5f5b03 | 99 | Thread t2(thread2); //start thread2 |
| dreschpe | 2:a69c8c5f5b03 | 100 | Thread t4(thread4); //start thread4 |
| 4180_1 | 4:79863d2ea5a0 | 101 | Thread t5(thread5); //start thread5 |
| TheFella | 5:d6da74ac1cc3 | 102 | |
| TheFella | 8:261f8af23dae | 103 | while(true) |
| TheFella | 8:261f8af23dae | 104 | { // main is the next thread |
| TheFella | 5:d6da74ac1cc3 | 105 | pc_mutex.lock(); |
| TheFella | 8:261f8af23dae | 106 | pc.printf("main\n\r"); |
| TheFella | 5:d6da74ac1cc3 | 107 | pc_mutex.unlock(); |
| dreschpe | 2:a69c8c5f5b03 | 108 | Thread::wait(500); // wait 0.5s |
| dreschpe | 0:f6a57b843f79 | 109 | } |
| dreschpe | 0:f6a57b843f79 | 110 | } |