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/*
* Copyright © 2012 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>
#include <ao_exti.h>
#define LPC_NUM_PINS 56
#define LPC_NUM_PINT 8
static void (*ao_exti_callback[LPC_NUM_PINT])(void);
static uint8_t ao_pint_map[LPC_NUM_PINS];
static uint8_t ao_pint_mode[LPC_NUM_PINS];
static uint8_t ao_pint_inuse;
static uint8_t ao_pint_enabled;
static void
ao_exti_isr(uint8_t pint)
{
uint8_t mask = 1 << pint;
if (lpc_gpio_pin.ist & mask) {
lpc_gpio_pin.ist = mask;
lpc_gpio_pin.rise = mask;
lpc_gpio_pin.fall = mask;
(*ao_exti_callback[pint]) ();
}
}
#define pin_isr(n) void lpc_pin_int ## n ## _isr(void) { ao_exti_isr(n); }
pin_isr(0)
pin_isr(1)
pin_isr(2)
pin_isr(3)
pin_isr(4)
pin_isr(5)
pin_isr(6)
pin_isr(7)
#define pin_id(port,pin) ((port) * 24 + (pin));
static void
_ao_exti_set_enable(uint8_t pint)
{
uint8_t mask = 1 << pint;
uint8_t mode;
if (ao_pint_enabled & mask)
mode = ao_pint_mode[pint];
else
mode = 0;
if (mode & AO_EXTI_MODE_RISING)
lpc_gpio_pin.sienr = mask;
else
lpc_gpio_pin.cienr = mask;
if (mode & AO_EXTI_MODE_FALLING)
lpc_gpio_pin.sienf = mask;
else
lpc_gpio_pin.cienf = mask;
lpc_gpio_pin.rise = mask;
lpc_gpio_pin.fall = mask;
}
void
ao_exti_setup (uint8_t port, uint8_t pin, uint8_t mode, void (*callback)(void)) {
uint8_t id = pin_id(port,pin);
uint8_t pint;
uint32_t mask;
uint8_t prio;
for (pint = 0; pint < LPC_NUM_PINT; pint++)
if ((ao_pint_inuse & (1 << pint)) == 0)
break;
if (pint == LPC_NUM_PINT)
ao_panic(AO_PANIC_EXTI);
if (!(mode & AO_EXTI_PIN_NOCONFIGURE))
ao_enable_input(port, pin, mode);
ao_arch_block_interrupts();
mask = (1 << pint);
ao_pint_inuse |= mask;
ao_pint_enabled &= ~mask;
ao_pint_map[id] = pint;
ao_exti_callback[pint] = callback;
/* configure gpio to interrupt routing */
lpc_scb.pintsel[pint] = id;
/* Set edge triggered */
lpc_gpio_pin.isel &= ~mask;
ao_pint_enabled &= ~mask;
ao_pint_mode[pint] = mode;
_ao_exti_set_enable(pint);
/* Set interrupt mask and rising/falling mode */
prio = AO_LPC_NVIC_MED_PRIORITY;
if (mode & AO_EXTI_PRIORITY_LOW)
prio = AO_LPC_NVIC_LOW_PRIORITY;
else if (mode & AO_EXTI_PRIORITY_HIGH)
prio = AO_LPC_NVIC_HIGH_PRIORITY;
/* Set priority and enable */
lpc_nvic_set_priority(LPC_ISR_PIN_INT0_POS + pint, prio);
lpc_nvic_set_enable(LPC_ISR_PIN_INT0_POS + pint);
ao_arch_release_interrupts();
}
void
ao_exti_set_mode(uint8_t port, uint8_t pin, uint8_t mode)
{
uint8_t id = pin_id(port,pin);
uint8_t pint = ao_pint_map[id];
ao_arch_block_interrupts();
ao_pint_mode[pint] = mode;
_ao_exti_set_enable(pint);
ao_arch_release_interrupts();
}
void
ao_exti_set_callback(uint8_t port, uint8_t pin, void (*callback)()) {
uint8_t id = pin_id(port,pin);
uint8_t pint = ao_pint_map[id];
ao_exti_callback[pint] = callback;
}
void
ao_exti_enable(uint8_t port, uint8_t pin)
{
uint8_t id = pin_id(port,pin);
uint8_t pint = ao_pint_map[id];
uint8_t mask = 1 << pint;
ao_arch_block_interrupts();
ao_pint_enabled |= mask;
_ao_exti_set_enable(pint);
ao_arch_release_interrupts();
}
void
ao_exti_disable(uint8_t port, uint8_t pin) {
uint8_t id = pin_id(port,pin);
uint8_t pint = ao_pint_map[id];
uint8_t mask = 1 << pint;
ao_arch_block_interrupts();
ao_pint_enabled &= ~mask;
_ao_exti_set_enable(pint);
ao_arch_release_interrupts();
}
void
ao_exti_init(void)
{
lpc_scb.sysahbclkctrl |= (1 << LPC_SCB_SYSAHBCLKCTRL_PINT);
}
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