![](/media/cache/profiles/5a3cd8928b0eb700317eb627594dbb3d.jpg.50x50_q85.jpg)
Bluetooth MP3 Player with uLCD, Speaker, and SD card hardware components
Dependencies: 4DGL-uLCD-SE SDFileSystem mbed-rtos mbed
Fork of app-board-RTOS-Threads by
Diff: main.cpp
- Revision:
- 2:a69c8c5f5b03
- Parent:
- 1:1c6a9eaf55b5
- Child:
- 3:3ec443c0842a
--- a/main.cpp Tue Oct 16 17:51:10 2012 +0000 +++ b/main.cpp Fri Oct 26 18:18:33 2012 +0000 @@ -1,8 +1,7 @@ -// example to test the mbed Lab Board lcd +// example to test the mbed Lab Board lcd lib with the mbed rtos // Pot1 change the contrast // Pot2 change the speed of the sin wave - #include "mbed.h" #include "rtos.h" #include "Small_6.h" @@ -11,114 +10,110 @@ #include "stdio.h" #include "C12832_lcd.h" -Serial pc(USBTX, USBRX); - - // LCD object C12832_LCD LCD("LCD"); AnalogIn Pot1(p19); AnalogIn Pot2(p20); -// defines to make lib thread save -#define _lock lcd_mutex.lock(); -#define _unlock lcd_mutex.unlock(); + +// mutex to make the lcd lib thread save Mutex lcd_mutex; -// print data into first line and wait for 1s +// Thread 1 +// print counter into first line and wait for 1 s void thread1(void const *args) { int i; while(true) { // thread loop - _lock + lcd_mutex.lock(); LCD.locate(0,0); LCD.set_font((unsigned char*) Small_6); printf("Thread1 count: %d",i); - LCD.copy_to_lcd(); - _unlock + lcd_mutex.unlock(); i++; Thread::wait(1000); } } -// print data into third line and wait for 0,5s +// Thread 2 +// print counter into third line and wait for 0,5s void thread2(void const *args) { int k; while(true) { // thread loop - _lock + lcd_mutex.lock(); LCD.locate(0,20); LCD.set_font((unsigned char*) Arial_9); printf("Thread 2 count : %d",k); - LCD.copy_to_lcd(); - _unlock + lcd_mutex.unlock(); k++; - Thread::wait(500); + Thread::wait(500); // wait 0.5s } } - -void thread4(void const *args) +// Thread 3 +// print a sin function in a small window +// the value of pot 1 change the speed of the sinwave +void thread3(void const *args) { int i,k,v; double s,a; k = 1; - _lock + lcd_mutex.lock(); LCD.rect(89,0,127,17,1); - _unlock + lcd_mutex.unlock(); while(true) { // thread loop - _lock 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); - a = 8 * sin((long double)(i+k-1) /5); - LCD.pixel(i,9 + (int)a ,0); - LCD.pixel(i,9 + (int)s ,1); + 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(); - _unlock + LCD.copy_to_lcd(); // LCD.pixel do not update the lcd + lcd_mutex.unlock(); k++; - Thread::wait(v/100); + Thread::wait(v/100); // value of pot1 / 100 } } - -void thread5(void const *args) +// Thread 4 +// input pot 2 and change the contrast of lcd +void thread4(void const *args) { int k; while(true) { // thread loop k = Pot2.read_u16(); // get the value of poti 2 - k = k >> 10; // we need only 6 bit - _lock + k = k >> 10; // we need only 6 bit for contrast + lcd_mutex.lock(); LCD.set_contrast(k); - _unlock - Thread::wait(500); + lcd_mutex.unlock(); + Thread::wait(500); // wait 0.5s } } + +// print the actual contrast 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 - LCD.claim(stdout); // send stdout to the LCD display - LCD.cls(); - //start thread1 - Thread t1(thread1); - //start thread2 - Thread t2(thread2); - //start thread4 - Thread t4(thread4); - Thread t5(thread5); - - while(true) { // this is the third thread - _lock + 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(); + j = LCD.get_contrast(); // read the actual contrast printf("contrast : %d",j); - LCD.copy_to_lcd(); - _unlock - Thread::wait(500); + lcd_mutex.unlock(); + Thread::wait(500); // wait 0.5s } }