diff options
Diffstat (limited to 'nuttx/arch/arm/src/stm32/stm32_exti_alarm.c')
-rw-r--r-- | nuttx/arch/arm/src/stm32/stm32_exti_alarm.c | 167 |
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; +} |