A very simple example of an RTOS executing on an LPC1768 Platform
Fork of app-board-RTOS-Threads by
Diff: main.cpp
- Revision:
- 5:d6da74ac1cc3
- Parent:
- 4:79863d2ea5a0
- Child:
- 6:7f833d7ef195
diff -r 79863d2ea5a0 -r d6da74ac1cc3 main.cpp --- a/main.cpp Sun Sep 22 17:57:46 2013 +0000 +++ b/main.cpp Mon Aug 08 02:42:42 2016 +0000 @@ -10,20 +10,19 @@ #include "stdio.h" #include "C12832_lcd.h" +#define LEDON 1 +#define LEDOFF 0 -C12832_LCD LCD; + +Serial pc(USBTX, USBRX); AnalogIn Pot1(p19); AnalogIn Pot2(p20); -PwmOut Speaker(p26); -PwmOut RGBLED_r(p23); -PwmOut RGBLED_g(p24); -PwmOut RGBLED_b(p25); -DigitalIn joyfire(p14); -BusIn joy(p15,p12,p13,p16); -BusOut leds(LED1,LED2,LED3,LED4); +DigitalOut led1(LED1); +DigitalOut led2(LED2); -// mutex to make the lcd lib thread safe -Mutex lcd_mutex; + +// mutex to make the serial thread safe +Mutex pc_mutex; // Thread 1 // print counter into first line and wait for 1 s @@ -31,11 +30,9 @@ { int i; while(true) { // thread loop - lcd_mutex.lock(); - LCD.locate(0,0); - LCD.set_font((unsigned char*) Small_6); - LCD.printf("Thread1 count: %d",i); - lcd_mutex.unlock(); + pc_mutex.lock(); + pc.printf("Thread1 count: %d\n\r",i); + pc_mutex.unlock(); i++; Thread::wait(1000); } @@ -47,118 +44,64 @@ { int k; while(true) { // thread loop - lcd_mutex.lock(); - LCD.locate(0,20); - LCD.set_font((unsigned char*) Arial_9); - LCD.printf("Thread 2 count : %d",k); - lcd_mutex.unlock(); + pc_mutex.lock(); + pc.printf("Thread 2 count : %d\n\r",k); + pc_mutex.unlock(); k++; Thread::wait(500); // wait 0.5s } } -// Thread 3 -// print a sin function in a small window -// the value of pot 1 changes the speed of the sine wave -void thread3(void const *args) -{ - int i,k,v; - double s,a; - k = 1; - lcd_mutex.lock(); - LCD.rect(89,0,127,17,1); - lcd_mutex.unlock(); - while(true) { // thread loop - v = Pot1.read_u16(); // get value of pot 1 - lcd_mutex.lock(); - for (i=90; i<127; i++) { - s = 8 * sin((long double)(i+k) /5); // pixel to print - a = 8 * sin((long double)(i+k-1) /5); // old pixel to erase - LCD.pixel(i,9 + (int)a ,0); // erase pixel - LCD.pixel(i,9 + (int)s ,1); // print pixel - } - LCD.copy_to_lcd(); // LCD.pixel does not update the lcd - lcd_mutex.unlock(); - k++; - Thread::wait(v/100); // value of pot1 / 100 - } -} - // Thread 4 -// input pot 2 and change the contrast of LCD +// the value of pot 1 changes the DC of LED1 void thread4(void const *args) { - int k; - while(true) { // thread loop - k = Pot2.read_u16(); // get the value of poti 2 - k = k >> 10; // need only 6 bits for contrast - lcd_mutex.lock(); - LCD.set_contrast(k); - lcd_mutex.unlock(); - Thread::wait(500); // wait 0.5s + while(true) { // thread loop + pc_mutex.lock(); + if( Pot1.read_u16() > 0xEFFF) + { + led1 = LEDON; + } + else + { + led1 = LEDOFF; + } + + pc_mutex.unlock(); } + Thread::wait(500); // value of pot1 / 100 } + // Thread 5 -// RGB LED +// the value of pot 2 changes the DC of LED2 void thread5(void const *args) { - while(true) { // thread loop - RGBLED_r = 0.5 + (rand() % 11)/20.0; - RGBLED_g = 0.5 + (rand() % 11)/20.0; - RGBLED_b = 0.5 + (rand() % 11)/20.0; - Thread::wait(1667); // wait 1.5s + while(true) { // thread loop + pc_mutex.lock(); + if( Pot2.read_u16() > 0xEFFF) + { + led2 = LEDON; + } + else + { + led2 = LEDOFF; + } + + pc_mutex.unlock(); } + Thread::wait(500); // value of pot1 / 100 } -// Thread 6 -// Speaker -void thread6(void const *args) -{ - while(true) { // thread loop - Speaker.period(1.0/800.0); - Speaker = 0.01; - Thread::wait(1000); // wait 1.0s - Speaker.period(1.0/969.0); - Speaker = 0.01; - Thread::wait(1000); // wait 1.0s - } -} - -// Thread 7 -// Joystick controls onboard mbed LEDs -void thread7(void const *args) -{ - while(true) { // thread loop - if (joyfire) { - leds = 0xf; - } else { - leds = joy; - } - Thread::wait(200); // wait 0.25s - } -} - - int main() { - int j; - LCD.cls(); - Thread t1(thread1); //start thread1 Thread t2(thread2); //start thread2 - Thread t3(thread3); //start thread3 Thread t4(thread4); //start thread4 Thread t5(thread5); //start thread5 - Thread t6(thread6); //start thread6 - Thread t7(thread7); //start thread7 - + while(true) { // main is the next thread - lcd_mutex.lock(); - LCD.locate(0,9); - LCD.set_font((unsigned char*) Small_7); - j = LCD.get_contrast(); // read the actual contrast - LCD.printf("contrast : %d",j); - lcd_mutex.unlock(); + pc_mutex.lock(); + pc_mutex.unlock(); Thread::wait(500); // wait 0.5s } }