/****************************************************************************
* arch/arm/src/stm32/stm32_exti.c
*
* Copyright (C) 2009, 2011 Gregory Nutt. All rights reserved.
* Copyright (C) 2011 Uros Platise. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
* Uros Platise <uros.platise@isotel.eu>
*
* 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 <debug.h>
#include <arch/irq.h>
#include "up_arch.h"
#include "chip.h"
#include "stm32_gpio.h"
#include "stm32_exti.h"
/****************************************************************************
* Private Data
****************************************************************************/
/* Interrupt handlers attached to each EXTI */
static xcpt_t stm32_exti_callbacks[16];
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Interrupt Service Routines - Dispatchers
****************************************************************************/
static int stm32_exti0_isr(int irq, void *context)
{
int ret = OK;
/* Clear the pending interrupt */
putreg32(0x0001, STM32_EXTI_PR);
/* And dispatch the interrupt to the handler */
if (stm32_exti_callbacks[0])
{
ret = stm32_exti_callbacks[0](irq, context);
}
return ret;
}
static int stm32_exti1_isr(int irq, void *context)
{
int ret = OK;
/* Clear the pending interrupt */
putreg32(0x0002, STM32_EXTI_PR);
/* And dispatch the interrupt to the handler */
if (stm32_exti_callbacks[1])
{
ret = stm32_exti_callbacks[1](irq, context);
}
return ret;
}
static int stm32_exti2_isr(int irq, void *context)
{
int ret = OK;
/* Clear the pending interrupt */
putreg32(0x0004, STM32_EXTI_PR);
/* And dispatch the interrupt to the handler */
if (stm32_exti_callbacks[2])
{
ret = stm32_exti_callbacks[2](irq, context);
}
return ret;
}
static int stm32_exti3_isr(int irq, void *context)
{
int ret = OK;
/* Clear the pending interrupt */
putreg32(0x0008, STM32_EXTI_PR);
/* And dispatch the interrupt to the handler */
if (stm32_exti_callbacks[3])
{
ret = stm32_exti_callbacks[3](irq, context);
}
return ret;
}
static int stm32_exti4_isr(int irq, void *context)
{
int ret = OK;
/* Clear the pending interrupt */
putreg32(0x0010, STM32_EXTI_PR);
/* And dispatch the interrupt to the handler */
if (stm32_exti_callbacks[4])
{
ret = stm32_exti_callbacks[4](irq, context);
}
return ret;
}
static int stm32_exti_multiisr(int irq, void *context, int first, int last)
{
uint32_t pr;
int pin;
int ret = OK;
/* Examine the state of each pin in the group */
pr = getreg32(STM32_EXTI_PR);
/* And dispatch the interrupt to the handler */
for (pin = first; pin <= last; pin++)
{
/* Is an interrupt pending on this pin? */
uint32_t mask = (1 << pin);
if ((pr & mask) != 0)
{
/* Clear the pending interrupt */
putreg32(mask, STM32_EXTI_PR);
/* And dispatch the interrupt to the handler */
if (stm32_exti_callbacks[pin])
{
int tmp = stm32_exti_callbacks[pin](irq, context);
if (tmp != OK)
{
ret = tmp;
}
}
}
}
return ret;
}
static int stm32_exti95_isr(int irq, void *context)
{
return stm32_exti_multiisr(irq, context, 5, 9);
}
static int stm32_exti1510_isr(int irq, void *context)
{
return stm32_exti_multiisr(irq, context, 10, 15);
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* 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.
*
****************************************************************************/
xcpt_t stm32_gpiosetevent(uint32_t pinset, bool risingedge, bool fallingedge,
bool event, xcpt_t func)
{
uint32_t pin = pinset & GPIO_PIN_MASK;
uint32_t exti = STM32_EXTI_BIT(pin);
int irq;
xcpt_t handler;
xcpt_t oldhandler = NULL;
/* Select the interrupt handler for this EXTI pin */
if (pin < 5)
{
irq = pin + STM32_IRQ_EXTI0;
switch (pin)
{
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;
}
}
else if (pin < 10)
{
irq = STM32_IRQ_EXTI95;
handler = stm32_exti95_isr;
}
else
{
irq = STM32_IRQ_EXTI1510;
handler = stm32_exti1510_isr;
}
/* Get the previous GPIO IRQ handler; Save the new IRQ handler. */
oldhandler = stm32_exti_callbacks[pin];
stm32_exti_callbacks[pin] = func;
/* Install external interrupt handlers */
if (func)
{
irq_attach(irq, handler);
up_enable_irq(irq);
}
else
{
up_disable_irq(irq);
}
/* Configure GPIO, enable EXTI line enabled if event or interrupt is enabled */
if (event || func)
{
pinset |= GPIO_EXTI;
}
stm32_configgpio(pinset);
/* Configure rising/falling edges */
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);
/* Return the old IRQ handler */
return oldhandler;
}
