250 lines
8.0 KiB
C
250 lines
8.0 KiB
C
/****************************************************************************
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* arch/arm/src/kinetis/kinetis_pin.c
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*
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* Copyright (C) 2011 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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 <arch/board/board.h>
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#include <assert.h>
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#include <errno.h>
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#include <nuttx/arch.h>
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#include "up_arch.h"
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#include "up_internal.h"
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#include "kinetis.h"
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#include "chip/kinetis_port.h"
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#include "chip/kinetis_gpio.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: kinetis_pinconfig
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*
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* Description:
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* Configure a PIN based on bit-encoded description of the pin. NOTE that
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* DMA/interrupts are disabled at the initial PIN configuratin.
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*
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****************************************************************************/
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int kinetis_pinconfig(uint32_t cfgset)
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{
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uintptr_t base;
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uint32_t regval;
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unsigned int port;
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unsigned int pin;
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unsigned int mode;
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/* Get the port number and pin number */
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port = (cfgset & _PIN_PORT_MASK) >> _PIN_PORT_SHIFT;
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pin = (cfgset & _PIN_MASK) >> _PIN_SHIFT;
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DEBUGASSERT(port < KINETIS_NPORTS);
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if (port < KINETIS_NPORTS)
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{
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/* Get the base address of PORT block for this port */
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base = KINETIS_PORT_BASE(port);
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/* Get the port mode */
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mode = (cfgset & _PIN_MODE_MASK) >> _PIN_MODE_SHIFT;
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/* Special case analog port mode. In this case, not of the digital
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* options are applicable.
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*/
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if (mode == PIN_MODE_ANALOG)
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{
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/* Set the analog mode with all digital options zeroed */
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regval = PORT_PCR_MUX_ANALOG | PORT_PCR_IRQC_DISABLED;
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putreg32(regval, base + KINETIS_PORT_PCR_OFFSET(pin));
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}
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else
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{
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/* Configure the digital pin options */
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regval = (mode << PORT_PCR_MUX_SHIFT);
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if ((cfgset & _PIN_IO_MASK) == _PIN_INPUT)
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{
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/* Handle input-only digital options */
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/* Check for pull-up or pull-down */
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if ((cfgset & _PIN_INPUT_PULLMASK) == _PIN_INPUT_PULLDOWN)
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{
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regval |= PORT_PCR_PE;
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}
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else if ((cfgset & _PIN_INPUT_PULLMASK) == _PIN_INPUT_PULLUP)
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{
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regval |= (PORT_PCR_PE | PORT_PCR_PS);
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}
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}
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else
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{
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/* Handle output-only digital options */
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/* Check for slow slew rate setting */
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if ((cfgset & _PIN_OUTPUT_SLEW_MASK) == _PIN_OUTPUT_SLOW)
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{
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regval |= PORT_PCR_SRE;
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}
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/* Check for open drain output */
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if ((cfgset & _PIN_OUTPUT_OD_MASK) == _PIN_OUTPUT_OPENDRAIN)
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{
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regval |= PORT_PCR_ODE;
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}
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/* Check for high drive output */
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if ((cfgset & _PIN_OUTPUT_DRIVE_MASK) == _PIN_OUTPUT_HIGHDRIVE)
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{
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regval |= PORT_PCR_DSE;
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}
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}
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/* Check for passive filter enable. Passive Filter configuration
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* is valid in all digital pin muxing modes.
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*/
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if ((cfgset & PIN_PASV_FILTER) != 0)
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{
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regval |= PORT_PCR_PFE;
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}
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/* Set the digital mode with all of the selected options */
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putreg32(regval, base + KINETIS_PORT_PCR_OFFSET(pin));
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/* Check for digital filter enable. Digital Filter configuration
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* is valid in all digital pin muxing modes.
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*/
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regval = getreg32(base + KINETIS_PORT_DFER_OFFSET);
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if ((cfgset & PIN_DIG_FILTER) != 0)
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{
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regval |= (1 << pin);
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}
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else
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{
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regval &= ~(1 << pin);
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}
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putreg32(regval, base + KINETIS_PORT_DFER_OFFSET);
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/* Additional configuration for the case of Alternative 1 (GPIO) modes */
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if (mode == PIN_MODE_GPIO)
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{
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/* Set the GPIO port direction */
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base = KINETIS_GPIO_BASE(port);
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regval = getreg32(base + KINETIS_GPIO_PDDR_OFFSET);
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if ((cfgset & _PIN_IO_MASK) == _PIN_INPUT)
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{
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/* Select GPIO input */
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regval &= ~(1 << pin);
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putreg32(regval, base + KINETIS_GPIO_PDDR_OFFSET);
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}
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else /* if ((cfgset & _PIN_IO_MASK) == _PIN_OUTPUT) */
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{
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/* Select GPIO input */
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regval |= (1 << pin);
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putreg32(regval, base + KINETIS_GPIO_PDDR_OFFSET);
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/* Set the initial value of the GPIO output */
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kinetis_gpiowrite(cfgset, ((cfgset & GPIO_OUTPUT_ONE) != 0));
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}
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}
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}
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return OK;
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}
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return -EINVAL;
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}
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/************************************************************************************
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* Name: kinetis_pinfilter
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*
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* Description:
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* Configure the digital filter associated with a port. The digital filter
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* capabilities of the PORT module are available in all digital pin muxing modes.
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*
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* Input Parameters:
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* port - Port number. See KINETIS_PORTn definitions in kinetis_port.h
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* lpo - true: Digital Filters are clocked by the bus clock
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* false: Digital Filters are clocked by the 1 kHz LPO clock
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* width - Filter Length
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*
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************************************************************************************/
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int kinetis_pinfilter(unsigned int port, bool lpo, unsigned int width)
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{
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uintptr_t base;
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uint32_t regval;
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DEBUGASSERT(port < KINETIS_NPORTS);
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if (port < KINETIS_NPORTS)
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{
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/* Get the base address of PORT block for this port */
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base = KINETIS_PORT_BASE(port);
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/* Select clocking */
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regval = (lpo ? PORT_DFCR_CS : 0);
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putreg32(regval, base + KINETIS_PORT_DFCR_OFFSET);
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/* Select the filter width */
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DEBUGASSERT(width < 32);
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putreg32(width, base + KINETIS_PORT_DFWR_OFFSET);
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return OK;
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}
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return -EINVAL;
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}
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