debut ordonnanceur

PicoShield/CarteMerePicoB6/ordonnanceur.c

+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <avr/io.h>			// for the input/output register
+#include <util/delay.h>  	// for the _delay_ms
+#include <avr/interrupt.h> 	
+
+
+struct process{
+    int* stackPointer;
+    void (*ptask)(); //pointer fonction
+    char* state;
+    
+};
+void init_timer()
+{
+	TCCR1B |= _BV(WGM12); // CTC mode with value in OCR1A 
+	TCCR1B |= _BV(CS12);  // CS12 = 1; CS11 = 0; CS10 =1 => CLK/1024 prescaler
+	TCCR1B |= _BV(CS10);
+	OCR1A   = NB_TICK;
+	TIMSK1 |= _BV(OCIE1A);
+}
+
+struct process process_tab[2];
+
+process_tab[0].ptask = &task_led_green;
+process_tab[1].ptask = &task_led_red;
+
+
+
+void scheduler()
+{
+}
+
+ISR(TIMER1_COMPA_vect,ISR_NAKED)
+{
+    /* Sauvegarde du contexte de la tâche interrompue */
+    //PC est automatiquement mis sur la pile
+    //on met les registres d'etat sur la pile
+    #define portSAVE_CONTEXT() \
+    asm volatile ( \
+    "push r0 \n\t" \ 
+    "in r0, __SREG__ \n\t" \//push SREG
+    "cli \n\t" \ 
+    "push r0 \n\t" \ 
+    "push r1 \n\t" \ 
+    "clr r1 \n\t" \ 
+    "push r2 \n\t" \
+    "push r3 \n\t" \
+    "push r4 \n\t" \
+    "push r5 \n\t" \
+    "push r6 \n\t" \
+    "push r7 \n\t" \
+    "push r8 \n\t" \
+    "push r9 \n\t" \
+    "push r10 \n\t" \
+    "push r11 \n\t" \
+    "push r12 \n\t" \ 
+    "push r13 \n\t" \
+    "push r14 \n\t" \
+    "push r15 \n\t" \
+    "push r16 \n\t" \
+    "push r17 \n\t" \
+    "push r18 \n\t" \
+    "push r19 \n\t" \
+    "push r20 \n\t" \
+    "push r21 \n\t" \
+    "push r22 \n\t" \
+    "push r23 \n\t" \
+    "push r24 \n\t" \
+    "push r25 \n\t" \
+    "push r26 \n\t" \
+    "push r27 \n\t" \
+    "push r28 \n\t" \
+    "push r29 \n\t" \
+    "push r30 \n\t" \
+    "push r31 \n\t" \
+    );
+    current_process.stackPointer = SP;
+    /* Appel à l'ordonnanceur */
+    scheduler();
+    /* Récupération du contexte de la tâche ré-activée */
+    ...
+    asm volatile ( "reti" );
+}
+
+void task_led_red(void)
+{
+}
+
+void task_led_green(void)
+{
+}
+
+
+int main()
+{
+    process_tab[0].ptask = &task_led_green;
+    process_tab[1].ptask = &task_led_red;
+    process_tab[0].state = "sleep";
+    process_tab[1].state = "sleep";
+
+    init_timer();
+    while(1)
+    {
+        
+    }
+}