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RTOS timer usage
Revision 1:10da8ca3d1cd, committed 2016-03-31
- Comitter:
- icserny
- Date:
- Thu Mar 31 14:15:35 2016 +0000
- Parent:
- 0:95dae97a932f
- Commit message:
- First version
Changed in this revision
main.cpp | Show annotated file Show diff for this revision Revisions of this file |
diff -r 95dae97a932f -r 10da8ca3d1cd main.cpp --- a/main.cpp Tue Feb 23 13:34:02 2016 +0000 +++ b/main.cpp Thu Mar 31 14:15:35 2016 +0000 @@ -1,56 +1,32 @@ -/** 10_rtos_queue +/** 12_rtos_timer + * LED blinking by four RTOS timer - a Handbook demo + * Link: https://developer.mbed.org/users/mbed_official/code/rtos_timer/docs/9dd7d49be2c3/main_8cpp_source.html * - * Simple example to use a Queue object to send integer data - * from thread1 to thread2. Note that Queue's put() method is - * intended to send a pointer, therefore typecasting - * should be appliedin in order to avoid compiler error messages. + * Hardware requirements: + * - FRDM-KL25Z board + * - 4 LEDs (with current limiting resistors) connected to the Arduino compatible D4,D5,D6,D7 pins */ + #include "mbed.h" #include "rtos.h" -AnalogIn potmeter(A0); -PwmOut myled(LED_BLUE); - -typedef uint32_t message_t; -Queue<message_t, 16> queue; - -void led_thread(void const *argument) -{ - myled.period_us(16384); //Set period to 16.384 ms - myled.pulsewidth_us(8192); //Initialize to 50% duty cycle - while (true) { - osEvent evt = queue.get(); //Wait for a message - switch(evt.status) { - case osOK: - printf("osOK\n"); //no error, no message arrived - break; - case osEventMessage: - printf("osEventMessage = %#05x\n",evt.value.v); //message arrived - //Note that evt.value is a union. - //Read as value.v to get a data, or value.p to get a pointer... - myled.pulsewidth_us((int)(evt.value.v>>2)); //roughly 0..16 ms - break; - case osEventTimeout: - printf("osEventTimeout\n"); //timeout occurred - break; - case osErrorParameter: - printf("osErrorParameter\n"); - break; //invalid parameter or is out of range. - default: - printf("Unknown error flag: %#08x\n",(uint32_t)evt.status); - break; - }; - } +DigitalOut LEDs[4] = {DigitalOut(D4), DigitalOut(D5), DigitalOut(D6), DigitalOut(D7)}; + +void blink(void const *n) { + LEDs[(int)n] = !LEDs[(int)n]; } - -int main (void) -{ - Thread thread2(led_thread); - - while (true) { - Thread::wait(1000); - uint16_t raw = potmeter.read_u16(); // read raw 16-bit data - queue.put((message_t*)raw); - } -} + +int main(void) { + RtosTimer led_1_timer(blink, osTimerPeriodic, (void *)0); + RtosTimer led_2_timer(blink, osTimerPeriodic, (void *)1); + RtosTimer led_3_timer(blink, osTimerPeriodic, (void *)2); + RtosTimer led_4_timer(blink, osTimerPeriodic, (void *)3); + + led_1_timer.start(2000); + led_2_timer.start(1000); + led_3_timer.start(500); + led_4_timer.start(250); + + Thread::wait(osWaitForever); +} \ No newline at end of file