/**************************************************************************** * arch/arm/src/sam3u/sam3u_pio.c * * Copyright (C) 2010 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 #include "up_internal.h" #include "up_arch.h" #include "chip.h" #include "sam3u_internal.h" #include "sam3u_pio.h" /**************************************************************************** * Definitions ****************************************************************************/ /**************************************************************************** * Private Types ****************************************************************************/ /**************************************************************************** * Private Data ****************************************************************************/ /**************************************************************************** * Private Function Prototypes ****************************************************************************/ /**************************************************************************** * Name: sam3u_gpiobase * * Description: * Returun the base address of the GPIO register set * ****************************************************************************/ static inline uintptr_t sam3u_gpiobase(uint16_t cfgset) { int port = (cfgset & GPIO_PORT_MASK) >> GPIO_PORT_SHIFT; return SAM3U_PION_BASE(port >> GPIO_PORT_SHIFT); } /**************************************************************************** * Name: sam3u_gpiopin * * Description: * Returun the base address of the GPIO register set * ****************************************************************************/ static inline int sam3u_gpiopin(uint16_t cfgset) { return 1 << ((cfgset & GPIO_PIN_MASK) >> GPIO_PIN_SHIFT); } /**************************************************************************** * Name: sam3u_configinput * * Description: * Configure a GPIO input pin based on bit-encoded description of the pin. * ****************************************************************************/ static inline int sam3u_configinput(uintptr_t base, uint32_t pin, uint16_t cfgset) { /* Disable interrupts on the pin */ putreg32(pin, base+SAM3U_PIO_IDR_OFFSET); /* Enable/disable the pull-up as requested */ if ((cfgset & GPIO_CFG_PULLUP) != 0) { putreg32(pin, base+SAM3U_PIO_PUER_OFFSET); } else { putreg32(pin, base+SAM3U_PIO_PUDR_OFFSET); } /* Check if filtering should be enabled */ if ((cfgset & GPIO_CFG_DEGLITCH) != 0) { putreg32(pin, base+SAM3U_PIO_IFER_OFFSET); } else { putreg32(pin, base+SAM3U_PIO_IFDR_OFFSET); } /* Configure the pin as an input and enable the GPIO function */ putreg32(pin, base+SAM3U_PIO_ODR_OFFSET); putreg32(pin, base+SAM3U_PIO_PER_OFFSET); /* To-Do: If DEGLITCH is selected, need to configure DIFSR, SCIFSR, and * registers. This would probably best be done with another, new * API... perhaps sam3u_configfilter() */ return OK; } /**************************************************************************** * Name: sam3u_configoutput * * Description: * Configure a GPIO output pin based on bit-encoded description of the pin. * ****************************************************************************/ static inline int sam3u_configoutput(uintptr_t base, uint32_t pin, uint16_t cfgset) { /* Disable interrupts on the pin */ putreg32(pin, base+SAM3U_PIO_IDR_OFFSET); /* Enable/disable the pull-up as requested */ if ((cfgset & GPIO_CFG_PULLUP) != 0) { putreg32(pin, base+SAM3U_PIO_PUER_OFFSET); } else { putreg32(pin, base+SAM3U_PIO_PUDR_OFFSET); } /* Enable the open drain driver if requrested */ if ((cfgset & GPIO_CFG_OPENDRAIN) != 0) { putreg32(pin, base+SAM3U_PIO_MDER_OFFSET); } else { putreg32(pin, base+SAM3U_PIO_MDDR_OFFSET); } /* Set default value */ if ((cfgset & GPIO_OUTPUT_SET) != 0) { putreg32(pin, base+SAM3U_PIO_SODR_OFFSET); } else { putreg32(pin, base+SAM3U_PIO_CODR_OFFSET); } /* Configure the pin as an input and enable the GPIO function */ putreg32(pin, base+SAM3U_PIO_OER_OFFSET); putreg32(pin, base+SAM3U_PIO_PER_OFFSET); return OK; } /**************************************************************************** * Name: sam3u_configperiph * * Description: * Configure a GPIO pin driven by a peripheral A or B signal based on * bit-encoded description of the pin. * ****************************************************************************/ static inline int sam3u_configperiph(uintptr_t base, uint32_t pin, uint16_t cfgset) { uint32_t regval; /* Disable interrupts on the pin */ putreg32(pin, base+SAM3U_PIO_IDR_OFFSET); /* Enable/disable the pull-up as requested */ if ((cfgset & GPIO_CFG_PULLUP) != 0) { putreg32(pin, base+SAM3U_PIO_PUER_OFFSET); } else { putreg32(pin, base+SAM3U_PIO_PUDR_OFFSET); } /* Configure pin, depending upon the peripheral A or B*/ regval = getreg32(base+SAM3U_PIO_ABSR_OFFSET); if ((cfgset & GPIO_MODE_MASK) == GPIO_PERIPHA) { regval &= ~pin; } else { regval |= pin; } putreg32(pin, base+SAM3U_PIO_ABSR_OFFSET); /* Disable PIO functionality */ putreg32(pin, base+SAM3U_PIO_PDR_OFFSET); return OK; } /**************************************************************************** * Global Functions ****************************************************************************/ /**************************************************************************** * Name: sam3u_configgpio * * Description: * Configure a GPIO pin based on bit-encoded description of the pin. * ****************************************************************************/ int sam3u_configgpio(uint16_t cfgset) { uintptr_t base = sam3u_gpiobase(cfgset); uint32_t pin = sam3u_gpiopin(cfgset); int ret; switch (cfgset & GPIO_MODE_MASK) { case GPIO_INPUT: ret = sam3u_configinput(base, pin, cfgset); break; case GPIO_OUTPUT: ret = sam3u_configoutput(base, pin, cfgset); break; case GPIO_PERIPHA: case GPIO_PERIPHB: ret = sam3u_configperiph(base, pin, cfgset); break; default: ret = -EINVAL; break; } return ret; } /**************************************************************************** * Name: sam3u_gpiowrite * * Description: * Write one or zero to the selected GPIO pin * ****************************************************************************/ void sam3u_gpiowrite(uint16_t pinset, bool value) { uintptr_t base = sam3u_gpiobase(pinset); uint32_t pin = sam3u_gpiopin(pinset); if (value) { putreg32(pin, base+SAM3U_PIO_SODR_OFFSET); } else { putreg32(pin, base+SAM3U_PIO_CODR_OFFSET); } } /**************************************************************************** * Name: sam3u_gpioread * * Description: * Read one or zero from the selected GPIO pin * ****************************************************************************/ bool sam3u_gpioread(uint16_t pinset) { uintptr_t base = sam3u_gpiobase(pinset); uint32_t pin = sam3u_gpiopin(pinset); uint32_t regval; if ((pinset & GPIO_MODE_MASK) == GPIO_OUTPUT) { regval = getreg32(base+SAM3U_PIO_ODSR_OFFSET); } else { regval = getreg32(base+SAM3U_PIO_PDSR_OFFSET); } return (regval & pin) != 0; }