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use interrupts for switches

This commit is contained in:
King Kévin 2014-07-26 20:30:39 -07:00
parent ecff66736d
commit 43257b8ace
1 changed files with 25 additions and 11 deletions
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36
pic/MDR/MDR.c
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@ -46,6 +46,7 @@
#define sleep() __asm sleep __endasm
/* variables */
static uint8_t switches; /* save the last switch state */
/* configuration bits */
uint16_t __at(_CONFIG1) __CONFIG1 = _FCMEN_ON & /* enable fail-safe clock monitor */
@ -68,11 +69,13 @@ void init (void) {
TRISB |= SWITCH1|SWITCH2; /* switches are inputs (with external pull-ups) */
TRISB &= ~(LED|MEMORY_CLK|MEMORY_DATA); /* LED is I2C memory are outputs */
led_off(); /* starting state */
/*
IOC |= (SWITCH1|SWITCH2|SWITCH3|SWITCH4); // enable interrupt for the switches
GPIE = 1; // enable interrupt on GPIO
last_gpio = GPIO; // save current state
IOCIE = 1; /* enable interrupt on individual GPIO (typo in the lib) */
IOCBP |= (SWITCH1|SWITCH2); /* enable interrupt when switch is released */
IOCBN |= (SWITCH1|SWITCH2); /* enable interrupt when switch is pressed */
switches = PORTB; /* save current switch state */
/*
T1CON = _T1CKPS1 | _T1CKPS0; // set prescaler to 8
// 0 is set per default, but just be sure
TMR1ON = 0; // stop timer 1
@ -81,16 +84,32 @@ void init (void) {
TMR1IF = 0; // clear interrupt
PIE1 = 1; // enable timer 1 interrupt
PEIE = 1; // enable timer interrupt
GIE = 1; // enable interrups
*/
GIE = 1; /* golablly enable interrupts */
}
/* funcion called on interrupts */
/* interrupt 0 is only one on PIC16 */
static void interrupt(void) __interrupt 0
{
if (IOCIF) { /* GPIO interrupt (typo in library?) */
if (IOCBF&(SWITCH1|SWITCH2)) { /* switch activity */
switches ^= PORTB; /* figure out which switch changed */
if (switches&SWITCH1) { /* switch 1 changed */
if (PORTB&SWITCH1) { /* switch 1 released */
led_off();
} else { /* switch 1 pressed */
led_on();
}
}
if (switches&SWITCH2) { /* switch 2 changed */
}
switches = PORTB; /* save current switch state */
IOCBF &= ~(SWITCH1|SWITCH2); /* clear switch interrupts */
}
IOCIF = 0; /* clear GPIO interrupt */
}
}
void main (void)
@ -98,11 +117,6 @@ void main (void)
init(); /* configure micro-controller */
led_on();
while (1) { /* a microcontroller runs forever */
if (PORTB&SWITCH1) {
led_off();
} else {
led_on();
}
// sleep(); /* sleep to save power */
}
}