c52f6592
 pfrison
Rédaction de quel...
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#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#define NB_TICK 104 //1563
#define CPU_FREQ 16000000L
#define QUANTUM_ms 10
#define SAVE_CONTEXT() \
asm volatile ( \
"push r0 \n\t" \
"in r0, __SREG__ \n\t" \
"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" \
);
#define RESTORE_CONTEXT() \
asm volatile ( \
"pop r31 \n\t" \
"pop r30 \n\t" \
"pop r29 \n\t" \
"pop r28 \n\t" \
"pop r27 \n\t" \
"pop r26 \n\t" \
"pop r25 \n\t" \
"pop r24 \n\t" \
"pop r23 \n\t" \
"pop r22 \n\t" \
"pop r21 \n\t" \
"pop r20 \n\t" \
"pop r19 \n\t" \
"pop r18 \n\t" \
"pop r17 \n\t" \
"pop r16 \n\t" \
"pop r15 \n\t" \
"pop r14 \n\t" \
"pop r13 \n\t" \
"pop r12 \n\t" \
"pop r11 \n\t" \
"pop r10 \n\t" \
"pop r9 \n\t" \
"pop r8 \n\t" \
"pop r7 \n\t" \
"pop r6 \n\t" \
"pop r5 \n\t" \
"pop r4 \n\t" \
"pop r3 \n\t" \
"pop r2 \n\t" \
"pop r1 \n\t" \
"pop r0 \n\t" \
"out __SREG__, r0 \n\t" \
"pop r0 \n\t" \
);
struct task{
uint16_t sp_vise;
uint8_t state;
};
/** Démarre le timer pour l'ordonnancement */
void init_timer(){
TCCR1B |= _BV(WGM12); // CTC mode with value in OCR1A
TCCR1B |= _BV(CS12); // CS12 = 1; CS11 = 1; CS10 =1 => CLK/1024 prescaler
TCCR1B |= _BV(CS10);
OCR1A = NB_TICK;
TIMSK1 |= _BV(OCIE1A);
}
/** Configure les ports */
void init_ports(){
//TODO DDRXs
}
/** Alumme la LED 13 pour témoigné du bon fonctionnement de la carte */
void temoin_allumage(){
DDRA = 0x01;
PORTA = 0x01;
_delay_ms(500);
PORTA = 0x00;
}
/** Reception de l'interruption généré par le timer (changement de contexte) */
ISR(TIMER1_COMPA_vect){
// TODO
sei();
}
int main(void){
temoin_allumage();
// Initialisation
init_timer();
init_port();
sei();
while(1){}
return 0;
}
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