altos/stm32f4: Add external interrupt bits

Signed-off-by: Keith Packard <keithp@keithp.com>

diff --git a/src/stm32f4/ao_exti.h b/src/stm32f4/ao_exti.h
new file mode 100644 (file)
index 0000000..0216f35
--- /dev/null
+++ b/src/stm32f4/ao_exti.h
@@ -0,0 +1,50 @@
+/*
+ * 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.
+ */
+
+#ifndef _AO_EXTI_H_
+#define _AO_EXTI_H_
+
+#define AO_EXTI_MODE_RISING    1
+#define AO_EXTI_MODE_FALLING   2
+#define AO_EXTI_MODE_PULL_NONE AO_GPIO_MODE_PULL_NONE
+#define AO_EXTI_MODE_PULL_UP   AO_GPIO_MODE_PULL_UP
+#define AO_EXTI_MODE_PULL_DOWN AO_GPIO_MODE_PULL_DOWN
+#define AO_EXTI_PRIORITY_LOW   16
+#define AO_EXTI_PRIORITY_MED   0
+#define AO_EXTI_PRIORITY_HIGH  32
+#define AO_EXTI_PIN_NOCONFIGURE        64
+
+void
+ao_exti_setup(struct stm_gpio *gpio, uint8_t pin, uint8_t mode, void (*callback)());
+
+void
+ao_exti_set_mode(struct stm_gpio *gpio, uint8_t pin, uint8_t mode);
+
+void
+ao_exti_set_callback(struct stm_gpio *gpio, uint8_t pin, void (*callback)());
+
+void
+ao_exti_enable(struct stm_gpio *gpio, uint8_t pin);
+
+void
+ao_exti_disable(struct stm_gpio *gpio, uint8_t pin);
+
+void
+ao_exti_init(void);
+
+#endif /* _AO_EXTI_H_ */

diff --git a/src/stm32f4/ao_exti_stm32f4.c b/src/stm32f4/ao_exti_stm32f4.c
new file mode 100644 (file)
index 0000000..1e288f9
--- /dev/null
+++ b/src/stm32f4/ao_exti_stm32f4.c
@@ -0,0 +1,162 @@
+/*
+ * 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) 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)
+{
+}