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/*
* Copyright 2010, Freie Universitรคt Berlin (FUB).
* Copyright 2013, INRIA.
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @ingroup cc430
* @file
* @brief CC430 GPIO Interrupt Multiplexer implementation
* @author Oliver Hahm <oliver.hahm@inria.fr>
*/
#include <stdlib.h>
#include <legacymsp430.h>
#include "gpioint.h"
#include "bitarithm.h"
#include "cpu.h"
#include "irq.h"
#include "xtimer.h"
/** min and max portnumber to generate interrupts */
#define PORTINT_MIN (1)
#define PORTINT_MAX (2)
/** amount of interrupt capable ports */
#define INT_PORTS (2)
/** number of bits per port */
#define BITMASK_SIZE (8)
/** debouncing port interrupts */
#define DEBOUNCE_TIMEOUT (250)
/** interrupt callbacks */
fp_irqcb cb[INT_PORTS][BITMASK_SIZE];
/** debounce interrupt flags */
uint8_t debounce_flags[INT_PORTS];
/** debounce interrupt times */
uint16_t debounce_time[INT_PORTS][BITMASK_SIZE];
uint16_t c1 = 0, c2 = 0;
void gpioint_init(void)
{
uint8_t i, j;
for (i = 0; i < INT_PORTS; i++) {
for (j = 0; j < BITMASK_SIZE; j++) {
cb[i][j] = NULL;
debounce_time[i][j] = 0;
}
}
}
bool gpioint_set(int port, uint32_t bitmask, int flags, fp_irqcb callback)
{
if ((port >= PORTINT_MIN) && (port <= PORTINT_MAX)) {
/* set the callback function */
int8_t base = bitarithm_msb(bitmask);
if (base >= 0) {
cb[port - PORTINT_MIN][base] = callback;
}
else {
return false;
}
if (flags & GPIOINT_DEBOUNCE) {
debounce_flags[port - PORTINT_MIN] |= bitmask;
}
else {
debounce_flags[port - PORTINT_MIN] &= ~bitmask;
}
}
switch(port) {
case 1:
/* set port to input */
P1DIR &= ~bitmask;
/* enable internal pull-down */
P1OUT &= ~bitmask;
P1REN |= bitmask;
/* reset IRQ flag */
P1IFG &= ~bitmask;
/* trigger on rising... */
if (flags & GPIOINT_RISING_EDGE) {
P1IES &= bitmask;
}
/* ...or falling edge */
if (flags & GPIOINT_FALLING_EDGE) {
P1IES |= bitmask;
}
/* disable interrupt */
if (flags == GPIOINT_DISABLE) {
P1IE &= ~bitmask;
}
/* enable interrupt */
P1IE |= bitmask;
break;
case 2:
/* set port to input */
P2DIR &= ~bitmask;
/* enable internal pull-down */
P2OUT &= ~bitmask;
P2REN |= bitmask;
/* reset IRQ flag */
P2IFG &= ~bitmask;
/* trigger on rising... */
if (flags == GPIOINT_RISING_EDGE) {
P2IES &= bitmask;
}
/* ...or falling edge */
else if (flags == GPIOINT_FALLING_EDGE) {
P2IES |= bitmask;
}
/* or disable interrupt */
else {
P2IE &= ~bitmask;
}
/* enable interrupt */
P2IE |= bitmask;
break;
default:
return false;
}
return 1;
}
interrupt(PORT1_VECTOR) __attribute__((naked)) port1_isr(void)
{
uint8_t int_enable, ifg_num, p1ifg;
uint16_t p1iv;
uint16_t diff;
__enter_isr();
/* Debounce
* Disable PORT1 IRQ
*/
p1ifg = P1IFG;
p1iv = P1IV;
int_enable = P1IE;
P1IE = 0x00;
ifg_num = (p1iv >> 1) - 1;
/* check interrupt source */
if (debounce_flags[0] & p1ifg) {
/* check if bouncing */
diff = xtimer_now_usec() - debounce_time[0][ifg_num];
if (diff > DEBOUNCE_TIMEOUT) {
debounce_time[0][ifg_num] = xtimer_now_usec();
if (cb[0][ifg_num] != NULL) {
cb[0][ifg_num]();
}
}
else {
/* TODO: check for long duration irq */
__asm__ volatile(" nop ");
}
}
else {
if (cb[0][ifg_num] != NULL) {
cb[0][ifg_num]();
}
}
P1IFG = 0x00;
P1IE = int_enable;
__exit_isr();
}
interrupt(PORT2_VECTOR) __attribute__((naked)) port2_isr(void)
{
uint8_t int_enable, ifg_num, p2ifg;
uint16_t p2iv;
uint16_t diff;
__enter_isr();
/* Debounce
* Disable PORT2 IRQ
*/
p2ifg = P2IFG;
p2iv = P2IV;
int_enable = P2IE;
P2IE = 0x00;
ifg_num = (p2iv >> 1) - 1;
/* check interrupt source */
if (debounce_flags[1] & p2ifg) {
/* check if bouncing */
diff = xtimer_now_usec() - debounce_time[1][ifg_num];
if (diff > DEBOUNCE_TIMEOUT) {
debounce_time[1][ifg_num] = xtimer_now_usec();
c1++;
if (cb[1][ifg_num] != NULL) {
cb[1][ifg_num]();
}
}
else {
c2++;
/* TODO: check for long duration irq */
__asm__ volatile(" nop ");
}
}
else {
if (cb[1][ifg_num] != NULL) {
cb[1][ifg_num]();
}
}
P2IFG = 0x00;
P2IE = int_enable;
__exit_isr();
}
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