X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=src%2Fstmf0%2Fao_exti_stm.c;fp=src%2Fstmf0%2Fao_exti_stm.c;h=906392e60f4ce0ce2f1985d5c520917f16cca6ed;hb=097c156b13ae975c742f294b46429e8ff14c365b;hp=0000000000000000000000000000000000000000;hpb=0f227683e29062224a612c4a2ab5c8b2fc166059;p=fw%2Faltos

diff --git a/src/stmf0/ao_exti_stm.c b/src/stmf0/ao_exti_stm.c
new file mode 100644
index 00000000..906392e6
--- /dev/null
+++ b/src/stmf0/ao_exti_stm.c
@@ -0,0 +1,149 @@
+/*
+ * Copyright © 2016 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);
+
+uint32_t	ao_last_exti;
+
+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_1_isr(void) { ao_exti_range_isr(0, 1, 0x0003); }
+void stm_exti2_3_isr(void) { ao_exti_range_isr(2, 3, 0x000c); }
+void stm_exti4_15_isr(void) { ao_exti_range_isr(4, 15, 0xfff0); }
+
+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 <= 1)
+		irq = STM_ISR_EXTI0_1_POS;
+	else if (pin <= 3)
+		irq = STM_ISR_EXTI2_3_POS;
+	else
+		irq = STM_ISR_EXTI4_15_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 |= (1 << pin);
+}
+
+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)
+{
+}