Directed Electronics 3200HS Informations techniques télécharger pdf (Page 78)

CSI to SPI Peripheral Communication in V850ES Microcontrollers

}

/* unsigned char sw_chk(void) */

/* return input from switches, undebounced */

unsigned char sw_chk(void)

{

return P9L & 0x30;

}

/* void sw_set_debounce(unsigned char count) */

/* set the debounce counter value */

void sw_set_debounce(unsigned char count)

{

sw_deb_value = count; /* set new debounce counter value */

sw_deb_count = count; /* set counter to max */

}

/* unsigned char sw_get(void) */

/* return debounced switch input */

unsigned char sw_get(void)

{

return sw_last;

}

/* void sw_isr( void ) */

/* this routine called by periodic timer interrupt to poll and debounce

switches */

/* after a new value has been seen steadily for sw_deb_value times, sw_last

is updated */

void sw_isr( void )

{

unsigned char val;

val = sw_chk(); /* get current value */

/* if value is the same as before, no change; reset debounce and return

if (val == sw_last) {

sw_deb_count = sw_deb_value; /* reset debounce counter to max */

return;

}

/* val != sw_last, there is a new input */

/* if it's not the same as the previous new one, */

/* set the NEW new one, reset the debounce counter and return */

if (val != sw_new) {

sw_new = val;

sw_deb_count = sw_deb_value;

return;

}

/* val != sw_last, val == sw_new */

/* count down the debounce counter */

sw_deb_count--;

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Directed Electronics 3200HS Informations techniques Page 78

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