semperf2.ino

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#include <krnl2.h>
 
// Performance test
// task shift fore every single signal and wait
// task1 (t1) toggles pin 13 for every 100 loop
// one loop have two task shift
// So a full square wave will have 400 task shift !
// Measured on an oscilloscope this takes 9.60 msec
// -> a semaphore operation with a task shift takes ...
// 9.60msec/400 = 24 usec !
 
 
struct k_t * tSm1;
struct k_t * p_t1, *p_t2;
 
#define STK_SIZE 90
 
char s1[STK_SIZE]; // stak for t1 ... and t2
char s2[STK_SIZE];
 
void t1(void) {
  int toggle=0;
  int c=0,c1=0;
 
  pinMode(13,OUTPUT); 
 
  while (1) {
    c++;
    if (c == 1000) {
      c = 0;
      c1++; 
      if (c1 == 100) {
        c1 = 0;
        digitalWrite(13, toggle == 0 ? HIGH : LOW);  
        toggle = ~toggle;
      }
    }
    k_wait(tSm1,0);
  }
}
 
void t2(void) {
  while (1) {
    k_signal(tSm1);
  }
}
 
 
 
// speed program
 
// led 13 is toggled every second loop of task t1
// one loop equals 2 task shift so half a period equals 2 shift
// TEST
// LED toggles approx every 4 msec which equals 200 task shift
// -> one task shift takes approx 20 usec
 
void setup() {
  int ii;
 
  Serial.begin(9600);
 
  k_init(5,5,5); // from now you can crt task,sem etc
 
  tSm1 = k_crt_sem(0,10); // 100 msec
 
  p_t1 = k_crt_task(t1, 9, s1, STK_SIZE);
  p_t2 = k_crt_task(t2, 10, s2, STK_SIZE);
 
 
  // If you want to test bef start
  // Serial.print("\nfree ram: ");
  //  ii = freeRam();
  //  Serial.println(ii);
  Serial.println("hh");
  k_start(1); // now we are runnning   with timer
  // main will not come back and will sleep rest of life
}
 
void loop(void) {
  // no one will come here
}
 
/* QED :-) */