diff options
Diffstat (limited to 'nuttx/arch/arm/src/stm32/stm32_exti_gpio.c')
-rw-r--r-- | nuttx/arch/arm/src/stm32/stm32_exti_gpio.c | 337 |
1 files changed, 337 insertions, 0 deletions
diff --git a/nuttx/arch/arm/src/stm32/stm32_exti_gpio.c b/nuttx/arch/arm/src/stm32/stm32_exti_gpio.c new file mode 100644 index 000000000..f897691ef --- /dev/null +++ b/nuttx/arch/arm/src/stm32/stm32_exti_gpio.c @@ -0,0 +1,337 @@ +/**************************************************************************** + * 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. + * 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; +} |