/****************************************************************************
* arch/arm/src/kinetis/kinetis_pingpio.c
*
* Copyright (C) 2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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 <arch/board/board.h>
#include <assert.h>
#include <errno.h>
#include <nuttx/arch.h>
#include "up_arch.h"
#include "up_internal.h"
#include "kinetis_memorymap.h"
#include "kinetis_internal.h"
#include "kinetis_gpio.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: kinetis_gpiowrite
*
* Description:
* Write one or zero to the selected GPIO pin
*
****************************************************************************/
void kinetis_gpiowrite(uint32_t pinset, bool value)
{
uintptr_t base;
unsigned int port;
unsigned int pin;
DEBUGASSERT((pinset & _PIN_MODE_MASK) == _PIN_MODE_GPIO);
DEBUGASSERT((pinset & _PIN_IO_MASK) == _PIN_OUTPUT);
/* Get the port number and pin number */
port = (pinset & _PIN_PORT_MASK) >> _PIN_PORT_SHIFT;
pin = (pinset & _PIN_MASK) >> _PIN_SHIFT;
DEBUGASSERT(port < KINETIS_NPORTS);
if (port < KINETIS_NPORTS)
{
/* Get the base address of GPIO block for this port */
base = KINETIS_GPIO_BASE(port);
/* Set or clear the output */
if (value)
{
putreg32((1 << pin), base + KINETIS_GPIO_PSOR_OFFSET);
}
else
{
putreg32((1 << pin), base + KINETIS_GPIO_PCOR_OFFSET);
}
}
}
/****************************************************************************
* Name: kinetis_gpioread
*
* Description:
* Read one or zero from the selected GPIO pin
*
****************************************************************************/
bool kinetis_gpioread(uint32_t pinset)
{
uintptr_t base;
uint32_t regval;
unsigned int port;
unsigned int pin;
bool ret = false;
DEBUGASSERT((pinset & _PIN_MODE_MASK) == _PIN_MODE_GPIO);
DEBUGASSERT((pinset & _PIN_IO_MASK) == _PIN_INPUT);
/* Get the port number and pin number */
port = (pinset & _PIN_PORT_MASK) >> _PIN_PORT_SHIFT;
pin = (pinset & _PIN_MASK) >> _PIN_SHIFT;
DEBUGASSERT(port < KINETIS_NPORTS);
if (port < KINETIS_NPORTS)
{
/* Get the base address of GPIO block for this port */
base = KINETIS_GPIO_BASE(port);
/* return the state of the pin */
regval = getreg32(base + KINETIS_GPIO_PDIR_OFFSET);
ret = ((regval & (1 << pin)) != 0);
}
return ret;
}
