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/*
* Copyright © 2018 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; either version 2 of the License, or
* (at your option) any later version.
*
* 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);
uint32_t ao_last_exti;
static void ao_exti_one_isr(uint8_t pin) {
uint32_t pending = (ao_last_exti = stm_exti.pr) & (1 << pin);
stm_exti.pr = pending;
if (pending && ao_exti_callback[pin])
(*ao_exti_callback[pin])();
}
static void ao_exti_range_isr(uint8_t first, uint8_t last, uint16_t mask) {
uint16_t pending = (ao_last_exti = stm_exti.pr) & mask;
uint8_t pin;
static uint16_t last_mask;
static uint8_t last_pin;
if (pending == last_mask) {
stm_exti.pr = last_mask;
(*ao_exti_callback[last_pin])();
return;
}
stm_exti.pr = pending;
for (pin = first; pin <= last; pin++)
if ((pending & ((uint32_t) 1 << pin)) && ao_exti_callback[pin]) {
last_mask = (1 << pin);
last_pin = pin;
(*ao_exti_callback[pin])();
}
}
void stm_exti0_isr(void) { ao_exti_one_isr(0); }
void stm_exti1_isr(void) { ao_exti_one_isr(1); }
void stm_exti2_isr(void) { ao_exti_one_isr(2); }
void stm_exti3_isr(void) { ao_exti_one_isr(3); }
void stm_exti4_isr(void) { ao_exti_one_isr(4); }
void stm_exti9_5_isr(void) { ao_exti_range_isr(5, 9, 0x3e0); }
void stm_exti15_10_isr(void) { ao_exti_range_isr(10, 15, 0xfc00); }
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;
uint8_t prio;
ao_exti_callback[pin] = callback;
/* configure gpio to interrupt routing */
stm_exticr_set(gpio, pin);
if (!(mode & AO_EXTI_PIN_NOCONFIGURE)) {
/* 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;
if (mode & AO_EXTI_MODE_RISING)
stm_exti.rtsr |= mask;
else
stm_exti.rtsr &= ~mask;
if (mode & AO_EXTI_MODE_FALLING)
stm_exti.ftsr |= mask;
else
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;
/* Set priority */
prio = AO_STM_NVIC_MED_PRIORITY;
if (mode & AO_EXTI_PRIORITY_LOW)
prio = AO_STM_NVIC_LOW_PRIORITY;
else if (mode & AO_EXTI_PRIORITY_HIGH)
prio = AO_STM_NVIC_HIGH_PRIORITY;
stm_nvic_set_priority(irq, prio);
stm_nvic_set_enable(irq);
}
void
ao_exti_set_mode(struct stm_gpio *gpio, uint8_t pin, uint8_t mode) {
(void) gpio;
uint32_t mask = 1 << pin;
if (mode & AO_EXTI_MODE_RISING)
stm_exti.rtsr |= mask;
else
stm_exti.rtsr &= ~mask;
if (mode & AO_EXTI_MODE_FALLING)
stm_exti.ftsr |= mask;
else
stm_exti.ftsr &= ~mask;
}
void
ao_exti_set_callback(struct stm_gpio *gpio, uint8_t pin, void (*callback)(void)) {
(void) gpio;
ao_exti_callback[pin] = callback;
}
void
ao_exti_enable(struct stm_gpio *gpio, uint8_t pin) {
uint32_t mask = (1 << pin);
(void) gpio;
stm_exti.pr = mask;
stm_exti.imr |= mask;
}
void
ao_exti_disable(struct stm_gpio *gpio, uint8_t pin) {
uint32_t mask = (1 << pin);
(void) gpio;
stm_exti.imr &= ~mask;
stm_exti.pr = mask;
}
void
ao_exti_init(void)
{
}
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