1 files changed, 167 insertions, 0 deletions
diff --git a/nuttx/arch/arm/src/stm32/stm32_exti_alarm.c b/nuttx/arch/arm/src/stm32/stm32_exti_alarm.c
new file mode 100644
index 000000000..07db26fd4
--- /dev/null
+++ b/nuttx/arch/arm/src/stm32/stm32_exti_alarm.c
@@ -0,0 +1,167 @@
+/****************************************************************************
+ * arch/arm/src/stm32/stm32_exti_alarm.c
+ *
+ *   Copyright (C) 2009, 2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *           Diego Sanchez <dsanchez@nx-engineering.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/irq.h>
+#include <nuttx/arch.h>
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <errno.h>
+
+#include <arch/irq.h>
+
+#include "up_arch.h"
+#include "chip.h"
+#include "stm32_gpio.h"
+#include "stm32_exti.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/* Interrupt handlers attached to the ALARM EXTI */
+
+static xcpt_t stm32_exti_callback;
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+ /****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: stm32_exti_alarm_isr
+ *
+ * Description:
+ *   EXTI ALARM interrupt service routine/dispatcher
+ *
+ ****************************************************************************/
+
+static int stm32_exti_alarm_isr(int irq, void *context)
+{
+  int ret = OK;
+
+  /* Clear the pending EXTI interrupt */
+
+  putreg32(EXTI_RTC_ALARM, STM32_EXTI_PR);
+
+  /* And dispatch the interrupt to the handler */
+
+  if (stm32_exti_callback)
+    {
+      ret = stm32_exti_callback(irq, context);
+    }
+
+  return ret;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: stm32_exti_alarm
+ *
+ * Description:
+ *   Sets/clears EXTI alarm interrupt.
+ *
+ * Parameters:
+ *  - rising/falling edge: enables interrupt on rising/falling edget
+ *  - event:  generate event when set
+ *  - func:   when non-NULL, generate interrupt
+ *
+ * Returns:
+ *   The previous value of the interrupt handler function pointer.  This
+ *   value may, for example, be used to restore the previous handler when
+ *   multiple handlers are used.
+ *
+ ****************************************************************************/
+
+xcpt_t stm32_exti_alarm(bool risingedge, bool fallingedge, bool event,
+                        xcpt_t func)
+{
+  xcpt_t oldhandler;
+
+  /* Get the previous GPIO IRQ handler; Save the new IRQ handler. */
+
+  oldhandler          = stm32_exti_callback;
+  stm32_exti_callback = func;
+
+  /* Install external interrupt handlers (if not already attached) */
+
+  if (func)
+    {
+      irq_attach(STM32_IRQ_RTCALRM, stm32_exti_alarm_isr);
+      up_enable_irq(STM32_IRQ_RTCALRM);
+    }
+  else
+    {
+      up_disable_irq(STM32_IRQ_RTCALRM);
+    }
+
+  /* Configure rising/falling edges */
+
+  modifyreg32(STM32_EXTI_RTSR,
+              risingedge ? 0 : EXTI_RTC_ALARM,
+              risingedge ? EXTI_RTC_ALARM : 0);
+  modifyreg32(STM32_EXTI_FTSR,
+              fallingedge ? 0 : EXTI_RTC_ALARM,
+              fallingedge ? EXTI_RTC_ALARM : 0);
+
+  /* Enable Events and Interrupts */
+
+  modifyreg32(STM32_EXTI_EMR,
+              event ? 0 : EXTI_RTC_ALARM,
+              event ? EXTI_RTC_ALARM : 0);
+  modifyreg32(STM32_EXTI_IMR,
+              func ? 0 : EXTI_RTC_ALARM,
+              func ? EXTI_RTC_ALARM : 0);
+
+  /* Return the old IRQ handler */
+
+  return oldhandler;
+}