/**************************************************************************** * arch/mips/src/pic32mx/pic32mx-gpio.c * * Copyright (C) 2011 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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 #include #include #include #include #include #include "up_arch.h" #include "pic32mx-gpio.h" #include "pic32mx-internal.h" #ifdef CONFIG_GPIO_IRQ /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /**************************************************************************** * Private Types ****************************************************************************/ /**************************************************************************** * Public Data ****************************************************************************/ /**************************************************************************** * Private Data ****************************************************************************/ static xcpt_t g_cnisrs[IOPORT_NUMCN]; /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: Inline PIN set field extractors ****************************************************************************/ static inline bool pic32mx_input(uint16_t pinset) { return ((pinset & GPIO_MODE_MASK) != GPIO_INPUT); } static inline bool pic32mx_interrupt(uint16_t pinset) { return ((pinset & GPIO_INTERRUPT) != 0); } static inline bool pic32mx_pullup(uint16_t pinset) { return ((pinset & GPIO_INT_MASK) == GPIO_PUINT); } /**************************************************************************** * Name: pic32mx_cninterrupt * * Description: * Change notification interrupt handler. * ****************************************************************************/ static int pic32mx_cninterrupt(int irq, FAR void *context) { int status; int ret = OK; int i; /* Call all attached handlers */ for (i = 0; i < IOPORT_NUMCN; i++) { /* Is this one attached */ if (g_cnisrs[i]) { /* Call the attached handler */ status = g_cnisrs[i](irq, context); /* Keep track of the status of the last handler that failed */ if (status < 0) { ret = status; } } /* Clear the pending interrupt */ up_clrpend_irq(PIC32MX_IRQ_CN); return ret; } /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: pic32mx_gpioirqinitialize * * Description: * Initialize logic to support a GPIO change notification interrupts. * This function is called internally by the system on power up and should * not be called again. * ****************************************************************************/ void pic32mx_gpioirqinitialize(void) { int ret; /* Attach the change notice interrupt handler */ ret = irqattach(PIC32MX_IRQ_CN, pic32mx_cninterrupt); DEBUGASSERT(ret == OK); /* Set the interrupt priority */ #ifdef CONFIG_ARCH_IRQPRIO ret = up_prioritize_irq(PIC32MX_IRQ_CN, CONFIG_PIC32MX_CNPRIO); DEBUGASSERT(ret == OK); #endif /* Reset all registers and enable the CN module */ putreg32(IOPORT_CN_ALL, PIC32MX_IOPORT_CNENCLR); putreg32(IOPORT_CN_ALL, PIC32MX_IOPORT_CNPUECLR); putreg32(IOPORT_CNCON_ON, PIC32MX_IOPORT_CNCON); /* And enable the GPIO interrupt */ ret = up_enable_irq(PIC32MX_IRQSRC_CN); DEBUGASSERT(ret == OK); } /**************************************************************************** * Name: pic32mx_gpioattach * * Description: * Attach an interrupt service routine to a GPIO interrupt. This will * also reconfigure the pin as an interrupting input. The change * notification number is associated with all interrupt-capabile GPIO pins. * The association could, however, differ from part to part and must be * provided by the caller. * * When an interrupt occurs, it is due to a change on the GPIO input pin. * In that case, all attached handlers will be called. Each handler must * maintain state and determine if the unlying GPIO input value changed. * * Parameters: * - pinset: GPIO pin configuration * - cn: The change notification number associated with the pin. * - handler: Interrupt handler (may be NULL to detach) * * 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 pic32mx_gpioattach(uint32_t pinset, unsigned int cn, xcpt_t handler) { xcpt_t oldhandler = NULL; irqstate_t flags; DEBUGASSERT(cn < IOPORT_NUMCN); /* First verify that the pinset is configured as an interrupting input */ if (pic32mx_input(pinset) && pic32mx_interrupt(pinset)) { /* Get the previously attached handler as the return value */ flags = irqsave(); oldhandler = g_cnisrs[cn]; /* Are we attaching or detaching? */ if (handler != NULL) { /* Attaching... Make sure that the GPIO is properly configured as * an input */ pic32mx_configgpio(pinset); /* Pull-up requested? */ if (pic32mx_pullup(pinset)) { putreg32(1 << cn, PIC32MX_IOPORT_CNPUESET); } else { putreg32(1 << cn, PIC32MX_IOPORT_CNPUECLR); } } else { /* Make sure that any further interrupts are disabled. * (disable the pull-up as well). */ putreg32(1 << cn, PIC32MX_IOPORT_CNENCLR); putreg32(1 << cn, PIC32MX_IOPORT_CNPUECLR); } /* Set the new handler (perhaps NULLifying the current handler) */ g_cnisrs[cn] = handler; irqrestore(flags); } return oldhandler; } /**************************************************************************** * Name: pic32mx_gpioirqenable * * Description: * Enable the interrupt for specified GPIO IRQ * ****************************************************************************/ void pic32mx_gpioirqenable(unsigned int cn) { DEBUGASSERT(cn < IOPORT_NUMCN); putreg32(1 << cn, PIC32MX_IOPORT_CNENSET); } /**************************************************************************** * Name: pic32mx_gpioirqdisable * * Description: * Disable the interrupt for specified GPIO IRQ * ****************************************************************************/ void pic32mx_gpioirqdisable(unsigned int cn) { DEBUGASSERT(cn < IOPORT_NUMCN); putreg32(1 << cn, PIC32MX_IOPORT_CNENCLR); } #endif /* CONFIG_GPIO_IRQ */