STM32: Add logic to attach the RTC alarm EXTI interrupt

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4947 42af7a65-404d-4744-a932-0658087f49c3

arch/arm/src/stm32/Make.defs

@@ -63,7 +63,7 @@ endif
 
 CHIP_ASRCS	= 
 CHIP_CSRCS	= stm32_allocateheap.c stm32_start.c stm32_rcc.c stm32_lse.c \
-		  stm32_lsi.c stm32_gpio.c  stm32_exti.c stm32_flash.c stm32_irq.c \
+		  stm32_lsi.c stm32_gpio.c stm32_exti_gpio.c stm32_flash.c stm32_irq.c \
 		  stm32_timerisr.c stm32_dma.c stm32_lowputc.c stm32_serial.c \
 		  stm32_spi.c stm32_sdio.c stm32_tim.c stm32_i2c.c stm32_waste.c
 
@@ -100,6 +100,9 @@ endif
 
 ifeq ($(CONFIG_RTC),y)
 CHIP_CSRCS	+= stm32_rtc.c
+ifeq ($(CONFIG_RTC_ALARM),y)
+CHIP_CSRCS	+= stm32_exti_alarm.c
+endif
 endif
 
 ifeq ($(CONFIG_ADC),y)

arch/arm/src/stm32/stm32_exti.h

@@ -1,8 +1,8 @@
 /************************************************************************************
  * arch/arm/src/stm32/stm32_exti.h
  *
- *   Copyright (C) 2009 Gregory Nutt. All rights reserved.
- *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *   Copyright (C) 2009, 2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -36,9 +36,82 @@
 #ifndef __ARCH_ARM_SRC_STM32_STM32_EXTI_H
 #define __ARCH_ARM_SRC_STM32_STM32_EXTI_H
 
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
 #include <nuttx/config.h>
 
 #include "chip.h"
 #include "chip/stm32_exti.h"
 
+/************************************************************************************
+ * Public Data
+ ************************************************************************************/
+
+#ifndef __ASSEMBLY__
+
+#undef EXTERN
+#if defined(__cplusplus)
+#define EXTERN extern "C"
+extern "C" {
+#else
+#define EXTERN extern
+#endif
+
+/************************************************************************************
+ * Public Function Prototypes
+ ************************************************************************************/
+
+/************************************************************************************
+ * Name: stm32_gpiosetevent
+ *
+ * Description:
+ *   Sets/clears GPIO based event and interrupt triggers.
+ *
+ * Parameters:
+ *  - pinset: gpio pin configuration
+ *  - rising/falling edge: enables
+ *  - 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.
+ *
+ ************************************************************************************/
+
+EXTERN xcpt_t stm32_gpiosetevent(uint32_t pinset, bool risingedge, bool fallingedge,
+                                 bool event, xcpt_t func);
+
+/****************************************************************************
+ * 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.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_RTC_ALARM
+EXTERN xcpt_t stm32_exti_alarm(bool risingedge, bool fallingedge, bool event,
+                               xcpt_t func);
+#endif
+
+#undef EXTERN
+#if defined(__cplusplus)
+}
+#endif
+
+#endif /* __ASSEMBLY__ */
 #endif /* __ARCH_ARM_SRC_STM32_STM32_EXTI_H */

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 ALRAM 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;
+}

arch/arm/src/stm32/stm32_exti_gpio.c

@@ -1,5 +1,5 @@
 /****************************************************************************
- * arch/arm/src/stm32/stm32_exti.c
+ * arch/arm/src/stm32/stm32_exti_gpio.c
  *
  *   Copyright (C) 2009, 2011-2012 Gregory Nutt. All rights reserved.
  *   Copyright (C) 2011 Uros Platise. All rights reserved.
@@ -58,6 +58,7 @@
 /****************************************************************************
  * Private Data
  ****************************************************************************/
+
 /* Interrupt handlers attached to each EXTI */
 
 static xcpt_t stm32_exti_callbacks[16];
@@ -88,6 +89,7 @@ static int stm32_exti0_isr(int irq, void *context)
     {
       ret = stm32_exti_callbacks[0](irq, context);
     }
+
   return ret;
 }
 
@@ -105,6 +107,7 @@ static int stm32_exti1_isr(int irq, void *context)
     {
       ret = stm32_exti_callbacks[1](irq, context);
     }
+
   return ret;
 }
 
@@ -122,6 +125,7 @@ static int stm32_exti2_isr(int irq, void *context)
     {
       ret = stm32_exti_callbacks[2](irq, context);
     }
+
   return ret;
 }
 
@@ -139,6 +143,7 @@ static int stm32_exti3_isr(int irq, void *context)
     {
       ret = stm32_exti_callbacks[3](irq, context);
     }
+
   return ret;
 }
 
@@ -156,6 +161,7 @@ static int stm32_exti4_isr(int irq, void *context)
     {
       ret = stm32_exti_callbacks[4](irq, context);
     }
+
   return ret;
 }
 
@@ -194,6 +200,7 @@ static int stm32_exti_multiisr(int irq, void *context, int first, int last)
             }
         }
     }
+
   return ret;
 }
 
@@ -249,15 +256,19 @@ xcpt_t stm32_gpiosetevent(uint32_t pinset, bool risingedge, bool fallingedge,
           case 0:
             handler = stm32_exti0_isr;
             break;
+
           case 1:
             handler = stm32_exti1_isr;
             break;
+
           case 2:
             handler = stm32_exti2_isr;
             break;
+
           case 3:
             handler = stm32_exti3_isr;
             break;
+
           default:
             handler = stm32_exti4_isr;
             break;
@@ -291,7 +302,9 @@ xcpt_t stm32_gpiosetevent(uint32_t pinset, bool risingedge, bool fallingedge,
       up_disable_irq(irq);
     }
 
-  /* Configure GPIO, enable EXTI line enabled if event or interrupt is enabled */
+  /* Configure GPIO, enable EXTI line enabled if event or interrupt is
+   * enabled.
+   */
 
   if (event || func)
     {
@@ -302,13 +315,21 @@ xcpt_t stm32_gpiosetevent(uint32_t pinset, bool risingedge, bool fallingedge,
 
   /* Configure rising/falling edges */
 
-  modifyreg32(STM32_EXTI_RTSR, risingedge ? 0 : exti, risingedge ? exti : 0);
-  modifyreg32(STM32_EXTI_FTSR, fallingedge ? 0 : exti, fallingedge ? exti : 0);
+  modifyreg32(STM32_EXTI_RTSR,
+              risingedge ? 0 : exti,
+              risingedge ? exti : 0);
+  modifyreg32(STM32_EXTI_FTSR,
+              fallingedge ? 0 : exti,
+              fallingedge ? exti : 0);
 
   /* Enable Events and Interrupts */
 
-  modifyreg32(STM32_EXTI_EMR, event ? 0 : exti, event ? exti : 0);
-  modifyreg32(STM32_EXTI_IMR, func ? 0 : exti, func ? exti : 0);
+  modifyreg32(STM32_EXTI_EMR,
+              event ? 0 : exti,
+              event ? exti : 0);
+  modifyreg32(STM32_EXTI_IMR,
+              func ? 0 : exti,
+              func ? exti : 0);
 
   /* Return the old IRQ handler */
 

arch/arm/src/stm32/stm32_gpio.h

@@ -67,16 +67,6 @@
  * Pre-Processor Declarations
  ************************************************************************************/
 
-#ifndef __ASSEMBLY__
-
-#undef EXTERN
-#if defined(__cplusplus)
-#define EXTERN extern "C"
-extern "C" {
-#else
-#define EXTERN extern
-#endif
-
 /* Bit-encoded input to stm32_configgpio() */
 
 #if defined(CONFIG_STM32_STM32F10XX)
@@ -390,9 +380,19 @@ extern "C" {
  * Public Data
  ************************************************************************************/
 
+#ifndef __ASSEMBLY__
+
+#undef EXTERN
+#if defined(__cplusplus)
+#define EXTERN extern "C"
+extern "C" {
+#else
+#define EXTERN extern
+#endif
+
 /* Base addresses for each GPIO block */
 
-extern const uint32_t g_gpiobase[STM32_NGPIO_PORTS];
+EXTERN const uint32_t g_gpiobase[STM32_NGPIO_PORTS];
 
 /************************************************************************************
  * Public Function Prototypes
@@ -499,7 +499,8 @@ EXTERN int stm32_dumpgpio(uint32_t pinset, const char *msg);
  *   Based on configuration within the .config file, it does:
  *    - Remaps positions of alternative functions.
  *
- * Typically called from stm32_start().
+ *   Typically called from stm32_start().
+ *
  ************************************************************************************/
 
 EXTERN void stm32_gpioinit(void);