--- /dev/null
+/*
+ * 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; 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)
+{
+}