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/*
* Copyright © 2011 Keith Packard <keithp@keithp.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "ao.h"
volatile __xdata struct ao_fifo ao_button_fifo;
static __code struct {
uint8_t mask;
uint8_t reg;
} ao_buttons[] = {
#ifdef BUTTON_1_MASK
{ BUTTON_1_MASK, BUTTON_1_REG },
#endif
#ifdef BUTTON_2_MASK
{ BUTTON_2_MASK, BUTTON_2_REG },
#endif
#ifdef BUTTON_3_MASK
{ BUTTON_3_MASK, BUTTON_3_REG },
#endif
};
#define NUM_BUTTONS ((sizeof ao_buttons) / sizeof (ao_buttons[0]))
static __xdata uint16_t ao_button_tick[NUM_BUTTONS];
static void
ao_button_insert(char n)
{
uint16_t now = ao_time();
if ((now - ao_button_tick[n]) > 20) {
ao_button_tick[n] = now;
ao_fifo_insert(ao_button_fifo, n);
ao_wakeup(&ao_button_fifo);
}
}
static void
ao_button_isr(uint8_t flag, uint8_t reg)
{
uint8_t b;
for (b = 0; b < NUM_BUTTONS; b++)
if (ao_buttons[b].reg == reg && (ao_buttons[b].mask & flag))
ao_button_insert(b + 1);
}
static uint8_t
ao_button_mask(uint8_t reg)
{
uint8_t b;
uint8_t mask = 0;
for (b = 0; b < NUM_BUTTONS; b++)
if (ao_buttons[b].reg == reg)
mask |= ao_buttons[b].mask;
return mask;
}
char
ao_button_get(uint16_t timeout) __critical
{
char b;
while (ao_fifo_empty(ao_button_fifo))
if (ao_sleep_for(&ao_button_fifo, timeout))
return 0;
ao_fifo_remove(ao_button_fifo, b);
return b;
}
void
ao_button_clear(void) __critical
{
char b;
while (!ao_fifo_empty(ao_button_fifo))
ao_fifo_remove(ao_button_fifo, b);
}
void
ao_p0_isr(void) ao_arch_interrupt(13)
{
P0IF = 0;
ao_button_isr(P0IFG, 0);
P0IFG = 0;
}
void
ao_p1_isr(void) ao_arch_interrupt(15)
{
P1IF = 0;
ao_button_isr(P1IFG, 1);
P1IFG = 0;
}
/* Shared with USB */
void
ao_p2_isr(void)
{
ao_button_isr(P2IFG, 2);
P2IFG = 0;
}
void
ao_button_init(void)
{
uint8_t mask;
/* Pins are configured as inputs with pull-up by default */
/* Enable interrupts for P0 inputs */
mask = ao_button_mask(0);
if (mask) {
if (mask & 0x0f)
PICTL |= PICTL_P0IENL;
if (mask & 0xf0)
PICTL |= PICTL_P0IENH;
P0IFG = 0;
P0IF = 0;
IEN1 |= IEN1_P0IE;
PICTL |= PICTL_P0ICON;
}
/* Enable interrupts for P1 inputs */
mask = ao_button_mask(1);
if (mask) {
P1IEN |= mask;
P1IFG = 0;
P1IF = 0;
IEN2 |= IEN2_P1IE;
PICTL |= PICTL_P1ICON;
}
/* Enable interrupts for P2 inputs */
mask = ao_button_mask(2);
if (mask) {
PICTL |= PICTL_P2IEN;
P2IFG = 0;
P2IF = 0;
IEN2 |= IEN2_P2IE;
PICTL |= PICTL_P2ICON;
}
}
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