altos: Starting to write cc1120 driver

[fw/altos] / src / stm / ao_exti_stm.c

diff --git a/src/stm/ao_exti_stm.c b/src/stm/ao_exti_stm.c
new file mode 100644 (file)
index 0000000..013d453
--- /dev/null
+++ b/src/stm/ao_exti_stm.c
@@ -0,0 +1,109 @@
+/*
+ * 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);
+}