diff options
Diffstat (limited to 'nuttx/arch/arm/src/kinetis/kinetis_pingpio.c')
-rw-r--r-- | nuttx/arch/arm/src/kinetis/kinetis_pingpio.c | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/nuttx/arch/arm/src/kinetis/kinetis_pingpio.c b/nuttx/arch/arm/src/kinetis/kinetis_pingpio.c new file mode 100644 index 000000000..23829c6d7 --- /dev/null +++ b/nuttx/arch/arm/src/kinetis/kinetis_pingpio.c @@ -0,0 +1,151 @@ +/**************************************************************************** + * arch/arm/src/kinetis/kinetis_pingpio.c + * + * Copyright (C) 2011 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * 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; +} + |