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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>
static void (*ao_exti_callback[16])(void);
static void
ao_exti_isr(void) {
uint32_t pending = stm_exti.pr;
uint8_t pin;
/* Clear pending interrupts */
stm_exti.pr = pending;
for (pin = 0; pin < 16 && pending; pin++) {
uint32_t mask = (1 << pin);
if (pending & mask) {
pending &= ~mask;
if (ao_exti_callback[pin])
(*ao_exti_callback[pin])();
}
}
}
void stm_exti0_isr(void) { ao_exti_isr(); }
void stm_exti1_isr(void) { ao_exti_isr(); }
void stm_exti2_isr(void) { ao_exti_isr(); }
void stm_exti3_isr(void) { ao_exti_isr(); }
void stm_exti4_isr(void) { ao_exti_isr(); }
void stm_exti9_5_isr(void) { ao_exti_isr(); }
void stm_exti15_10_isr(void) { ao_exti_isr(); }
void
ao_exti_setup (struct stm_gpio *gpio, uint8_t pin, uint8_t mode, void (*callback)(void)) {
uint32_t mask = 1 << pin;
uint32_t pupdr;
uint8_t irq;
ao_exti_callback[pin] = callback;
/* configure pin as input, setting selected pull-up/down mode */
stm_moder_set(gpio, pin, STM_MODER_INPUT);
switch (mode & (AO_EXTI_MODE_PULL_UP|AO_EXTI_MODE_PULL_DOWN)) {
case 0:
default:
pupdr = STM_PUPDR_NONE;
break;
case AO_EXTI_MODE_PULL_UP:
pupdr = STM_PUPDR_PULL_UP;
break;
case AO_EXTI_MODE_PULL_DOWN:
pupdr = STM_PUPDR_PULL_DOWN;
break;
}
stm_pupdr_set(gpio, pin, pupdr);
/* Set interrupt mask and rising/falling mode */
stm_exti.imr &= ~mask;
stm_exti.rtsr |= mask;
if (mode & AO_EXTI_MODE_RISING)
stm_exti.rtsr |= mask;
if (mode & AO_EXTI_MODE_FALLING)
stm_exti.ftsr |= mask;
if (pin <= 4)
irq = STM_ISR_EXTI0_POS + pin;
else if (pin <= 9)
irq = STM_ISR_EXTI9_5_POS;
else
irq = STM_ISR_EXTI15_10_POS;
stm_nvic_set_priority(irq, 10);
stm_nvic_set_enable(irq);
}
void
ao_exti_enable(struct stm_gpio *gpio, uint8_t pin) {
stm_exti.imr |= (1 << pin);
}
void
ao_exti_disable(struct stm_gpio *gpio, uint8_t pin) {
stm_exti.imr &= ~(1 << pin);
}
void
ao_exti_init(void)
{
stm_nvic_set_priority(STM_ISR_EXTI1_POS, 10);
stm_nvic_set_priority(STM_ISR_EXTI2_POS, 10);
stm_nvic_set_priority(STM_ISR_EXTI3_POS, 10);
stm_nvic_set_priority(STM_ISR_EXTI4_POS, 10);
stm_nvic_set_priority(STM_ISR_EXTI9_5_POS, 10);
stm_nvic_set_priority(STM_ISR_EXTI15_10_POS, 10);
}
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