2010-01-19 03:42:05 +01:00
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/****************************************************************************
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* arch/arm/src/sam3u/sam3u_pio.c
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*
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* Copyright (C) 2010 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <time.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/arch.h>
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#include <arch/board/board.h>
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#include "up_internal.h"
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#include "up_arch.h"
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#include "chip.h"
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#include "sam3u_internal.h"
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#include "sam3u_pio.h"
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/****************************************************************************
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* Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Types
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****************************************************************************/
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2010-01-20 02:28:12 +01:00
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/****************************************************************************
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* Private Data
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****************************************************************************/
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2010-01-19 03:42:05 +01:00
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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2010-01-20 02:28:12 +01:00
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/****************************************************************************
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* Name: sam3u_gpiobase
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*
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* Description:
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* Returun the base address of the GPIO register set
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*
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****************************************************************************/
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2010-01-19 03:42:05 +01:00
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2010-01-20 02:28:12 +01:00
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static inline uintptr_t sam3u_gpiobase(uint16_t cfgset)
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{
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int port = (cfgset & GPIO_PORT_MASK) >> GPIO_PORT_SHIFT;
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return SAM3U_PION_BASE(port >> GPIO_PORT_SHIFT);
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}
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/****************************************************************************
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* Name: sam3u_gpiopin
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2010-01-19 03:42:05 +01:00
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*
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* Description:
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2010-01-20 02:28:12 +01:00
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* Returun the base address of the GPIO register set
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2010-01-19 03:42:05 +01:00
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*
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2010-01-20 02:28:12 +01:00
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****************************************************************************/
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2010-01-19 03:42:05 +01:00
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2010-01-20 02:28:12 +01:00
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static inline int sam3u_gpiopin(uint16_t cfgset)
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2010-01-19 03:42:05 +01:00
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{
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2010-01-20 02:28:12 +01:00
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return 1 << ((cfgset & GPIO_PIN_MASK) >> GPIO_PIN_SHIFT);
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2010-01-19 03:42:05 +01:00
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}
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2010-01-20 02:28:12 +01:00
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/****************************************************************************
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* Name: sam3u_configinput
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2010-01-19 03:42:05 +01:00
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*
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* Description:
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2010-01-20 02:28:12 +01:00
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* Configure a GPIO input pin based on bit-encoded description of the pin.
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2010-01-19 03:42:05 +01:00
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*
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2010-01-20 02:28:12 +01:00
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****************************************************************************/
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2010-01-19 03:42:05 +01:00
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2010-01-20 02:28:12 +01:00
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static inline int sam3u_configinput(uintptr_t base, uint32_t pin,
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uint16_t cfgset)
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2010-01-19 03:42:05 +01:00
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{
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2010-01-20 02:28:12 +01:00
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/* Disable interrupts on the pin */
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putreg32(pin, base+SAM3U_PIO_IDR_OFFSET);
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/* Enable/disable the pull-up as requested */
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if ((cfgset & GPIO_CFG_PULLUP) != 0)
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{
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putreg32(pin, base+SAM3U_PIO_PUER_OFFSET);
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}
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else
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{
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putreg32(pin, base+SAM3U_PIO_PUDR_OFFSET);
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}
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/* Check if filtering should be enabled */
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if ((cfgset & GPIO_CFG_DEGLITCH) != 0)
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{
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putreg32(pin, base+SAM3U_PIO_IFER_OFFSET);
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}
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else
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{
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putreg32(pin, base+SAM3U_PIO_IFDR_OFFSET);
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}
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/* Configure the pin as an input and enable the GPIO function */
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putreg32(pin, base+SAM3U_PIO_ODR_OFFSET);
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putreg32(pin, base+SAM3U_PIO_PER_OFFSET);
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/* To-Do: If DEGLITCH is selected, need to configure DIFSR, SCIFSR, and
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* registers. This would probably best be done with another, new
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* API... perhaps sam3u_configfilter()
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*/
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return OK;
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2010-01-19 03:42:05 +01:00
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}
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2010-01-20 02:28:12 +01:00
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/****************************************************************************
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* Name: sam3u_configoutput
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2010-01-19 03:42:05 +01:00
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*
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* Description:
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2010-01-20 02:28:12 +01:00
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* Configure a GPIO output pin based on bit-encoded description of the pin.
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2010-01-19 03:42:05 +01:00
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*
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2010-01-20 02:28:12 +01:00
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****************************************************************************/
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2010-01-19 03:42:05 +01:00
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2010-01-20 02:28:12 +01:00
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static inline int sam3u_configoutput(uintptr_t base, uint32_t pin,
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uint16_t cfgset)
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2010-01-19 03:42:05 +01:00
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{
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2010-01-20 02:28:12 +01:00
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/* Disable interrupts on the pin */
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putreg32(pin, base+SAM3U_PIO_IDR_OFFSET);
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/* Enable/disable the pull-up as requested */
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if ((cfgset & GPIO_CFG_PULLUP) != 0)
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{
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putreg32(pin, base+SAM3U_PIO_PUER_OFFSET);
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}
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else
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{
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putreg32(pin, base+SAM3U_PIO_PUDR_OFFSET);
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}
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/* Enable the open drain driver if requrested */
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if ((cfgset & GPIO_CFG_OPENDRAIN) != 0)
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{
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putreg32(pin, base+SAM3U_PIO_MDER_OFFSET);
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}
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else
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{
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putreg32(pin, base+SAM3U_PIO_MDDR_OFFSET);
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}
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/* Set default value */
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if ((cfgset & GPIO_OUTPUT_SET) != 0)
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{
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putreg32(pin, base+SAM3U_PIO_SODR_OFFSET);
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}
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else
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{
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putreg32(pin, base+SAM3U_PIO_CODR_OFFSET);
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}
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/* Configure the pin as an input and enable the GPIO function */
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putreg32(pin, base+SAM3U_PIO_OER_OFFSET);
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putreg32(pin, base+SAM3U_PIO_PER_OFFSET);
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return OK;
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2010-01-19 03:42:05 +01:00
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}
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2010-01-20 02:28:12 +01:00
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/****************************************************************************
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* Name: sam3u_configperiph
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2010-01-19 03:42:05 +01:00
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*
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* Description:
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2010-01-20 02:28:12 +01:00
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* Configure a GPIO pin driven by a peripheral A or B signal based on
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* bit-encoded description of the pin.
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2010-01-19 03:42:05 +01:00
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*
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2010-01-20 02:28:12 +01:00
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****************************************************************************/
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2010-01-19 03:42:05 +01:00
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2010-01-20 02:28:12 +01:00
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static inline int sam3u_configperiph(uintptr_t base, uint32_t pin,
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uint16_t cfgset)
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2010-01-19 03:42:05 +01:00
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{
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2010-01-20 02:28:12 +01:00
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uint32_t regval;
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/* Disable interrupts on the pin */
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putreg32(pin, base+SAM3U_PIO_IDR_OFFSET);
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/* Enable/disable the pull-up as requested */
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if ((cfgset & GPIO_CFG_PULLUP) != 0)
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{
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putreg32(pin, base+SAM3U_PIO_PUER_OFFSET);
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}
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else
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{
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putreg32(pin, base+SAM3U_PIO_PUDR_OFFSET);
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}
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/* Configure pin, depending upon the peripheral A or B*/
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regval = getreg32(base+SAM3U_PIO_ABSR_OFFSET);
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if ((cfgset & GPIO_MODE_MASK) == GPIO_PERIPHA)
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{
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regval &= ~pin;
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}
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else
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{
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regval |= pin;
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}
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putreg32(pin, base+SAM3U_PIO_ABSR_OFFSET);
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/* Disable PIO functionality */
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putreg32(pin, base+SAM3U_PIO_PDR_OFFSET);
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return OK;
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2010-01-19 03:42:05 +01:00
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}
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/****************************************************************************
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* Global Functions
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****************************************************************************/
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2010-01-20 02:28:12 +01:00
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/****************************************************************************
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2010-01-19 03:42:05 +01:00
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* Name: sam3u_configgpio
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*
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* Description:
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* Configure a GPIO pin based on bit-encoded description of the pin.
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*
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2010-01-20 02:28:12 +01:00
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****************************************************************************/
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2010-01-19 03:42:05 +01:00
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int sam3u_configgpio(uint16_t cfgset)
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{
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2010-01-20 02:28:12 +01:00
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uintptr_t base = sam3u_gpiobase(cfgset);
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uint32_t pin = sam3u_gpiopin(cfgset);
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int ret;
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2010-01-19 03:42:05 +01:00
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switch (cfgset & GPIO_MODE_MASK)
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{
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case GPIO_INPUT:
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2010-01-20 02:28:12 +01:00
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ret = sam3u_configinput(base, pin, cfgset);
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2010-01-19 03:42:05 +01:00
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break;
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case GPIO_OUTPUT:
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2010-01-20 02:28:12 +01:00
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ret = sam3u_configoutput(base, pin, cfgset);
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2010-01-19 03:42:05 +01:00
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break;
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case GPIO_PERIPHA:
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case GPIO_PERIPHB:
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2010-01-20 02:28:12 +01:00
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ret = sam3u_configperiph(base, pin, cfgset);
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2010-01-19 03:42:05 +01:00
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break;
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2010-01-20 02:28:12 +01:00
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2010-01-19 03:42:05 +01:00
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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2010-01-20 02:28:12 +01:00
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/****************************************************************************
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2010-01-19 03:42:05 +01:00
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* Name: sam3u_gpiowrite
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*
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* Description:
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* Write one or zero to the selected GPIO pin
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*
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2010-01-20 02:28:12 +01:00
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****************************************************************************/
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2010-01-19 03:42:05 +01:00
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void sam3u_gpiowrite(uint16_t pinset, bool value)
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{
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2010-01-20 02:28:12 +01:00
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uintptr_t base = sam3u_gpiobase(pinset);
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uint32_t pin = sam3u_gpiopin(pinset);
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if (value)
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{
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putreg32(pin, base+SAM3U_PIO_SODR_OFFSET);
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}
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else
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{
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putreg32(pin, base+SAM3U_PIO_CODR_OFFSET);
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}
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2010-01-19 03:42:05 +01:00
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}
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2010-01-20 02:28:12 +01:00
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/****************************************************************************
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2010-01-19 03:42:05 +01:00
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* Name: sam3u_gpioread
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*
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* Description:
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* Read one or zero from the selected GPIO pin
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*
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2010-01-20 02:28:12 +01:00
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****************************************************************************/
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2010-01-19 03:42:05 +01:00
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bool sam3u_gpioread(uint16_t pinset)
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{
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2010-01-20 02:28:12 +01:00
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uintptr_t base = sam3u_gpiobase(pinset);
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uint32_t pin = sam3u_gpiopin(pinset);
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uint32_t regval;
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2010-01-19 03:42:05 +01:00
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2010-01-20 02:28:12 +01:00
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if ((pinset & GPIO_MODE_MASK) == GPIO_OUTPUT)
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{
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regval = getreg32(base+SAM3U_PIO_ODSR_OFFSET);
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}
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else
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{
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regval = getreg32(base+SAM3U_PIO_PDSR_OFFSET);
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}
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2010-01-19 03:42:05 +01:00
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2010-01-20 02:28:12 +01:00
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return (regval & pin) != 0;
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2010-01-19 03:42:05 +01:00
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}
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