diff options
Diffstat (limited to 'nuttx/arch/arm/src/kinetis/kinetis_pin.c')
| -rwxr-xr-x | nuttx/arch/arm/src/kinetis/kinetis_pin.c | 261 |
1 files changed, 261 insertions, 0 deletions
diff --git a/nuttx/arch/arm/src/kinetis/kinetis_pin.c b/nuttx/arch/arm/src/kinetis/kinetis_pin.c new file mode 100755 index 000000000..cdd9e19c1 --- /dev/null +++ b/nuttx/arch/arm/src/kinetis/kinetis_pin.c @@ -0,0 +1,261 @@ +/**************************************************************************** + * arch/arm/src/kinetis/kinetis_pin.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_port.h" +#include "kinetis_gpio.h" + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: kinetis_pinconfig + * + * Description: + * Configure a PIN based on bit-encoded description of the pin. NOTE that + * DMA/interrupts are disabled at the initial PIN configuratin. + * + ****************************************************************************/ + +int kinetis_pinconfig(uint32_t cfgset) +{ + uintptr_t base; + uint32_t regval; + unsigned int port; + unsigned int pin; + unsigned int mode; + + /* Get the port number and pin number */ + + port = (cfgset & _PIN_PORT_MASK) >> _PIN_PORT_SHIFT; + pin = (cfgset & _PIN_MASK) >> _PIN_SHIFT; + + DEBUGASSERT(port < KINETIS_NPORTS); + if (port < KINETIS_NPORTS) + { + /* Get the base address of PORT block for this port */ + + base = KINETIS_PORT_BASE(port); + + /* Get the port mode */ + + mode = (cfgset & _PIN_MODE_MASK) >> _PIN_MODE_SHIFT; + + /* Special case analog port mode. In this case, not of the digital + * options are applicable. + */ + + if (mode == _PIN_MODE_ANALOG) + { + /* Set the analog mode with all digital options zeroed */ + + regval = PORT_PCR_MUX_ANALOG | PORT_PCR_IRQC_DISABLED; + putreg32(regval, base + KINETIS_PORT_PCR_OFFSET(pin)); + } + else + { + /* Configure the digital pin options */ + + regval = (mode << PORT_PCR_MUX_SHIFT); + if ((cfgset & _PIN_IO_MASK) == _PIN_INPUT) + { + /* Handle input-only digital options */ + /* Check for pull-up or pull-down */ + + if ((cfgset & _PIN_INPUT_PULLMASK) == _PIN_INPUT_PULLDOWN) + { + regval |= PORT_PCR_PE; + } + else if ((cfgset & _PIN_INPUT_PULLMASK) == _PIN_INPUT_PULLUP) + { + regval |= (PORT_PCR_PE | PORT_PCR_PS); + } + } + else + { + /* Handle output-only digital options */ + /* Check for slow slew rate setting */ + + if ((cfgset & _PIN_OUTPUT_SLEW_MASK) == _PIN_OUTPUT_SLOW) + { + regval |= PORT_PCR_SRE; + } + + /* Check for open drain output */ + + if ((cfgset & _PIN_OUTPUT_OD_MASK) == _PIN_OUTPUT_OPENDRAIN) + { + regval |= PORT_PCR_ODE; + } + + /* Check for high drive output */ + + if ((cfgset & _PIN_OUTPUT_DRIVE_MASK) == _PIN_OUTPUT_HIGHDRIVE) + { + regval |= PORT_PCR_DSE; + } + } + + /* Check for passive filter enable. Passive Filter configuration + * is valid in all digital pin muxing modes. + */ + + if ((cfgset & PIN_PASV_FILTER) != 0) + { + regval |= PORT_PCR_PFE; + } + + /* Set the digital mode with all of the selected options */ + + putreg32(regval, base + KINETIS_PORT_PCR_OFFSET(pin)); + + /* Check for digital filter enable. Digital Filter configuration + * is valid in all digital pin muxing modes. + */ + + regval = getreg32(base + KINETIS_PORT_DFER_OFFSET); + if ((cfgset & PIN_DIG_FILTER) != 0) + { + regval |= (1 << pin); + } + else + { + regval &= ~(1 << pin); + } + putreg32(regval, base + KINETIS_PORT_DFER_OFFSET); + + /* Additional configuration for the case of Alternative 1 (GPIO) modes */ + + if (mode == _PIN_MODE_GPIO) + { + /* Set the GPIO port direction */ + + base = KINETIS_GPIO_BASE(port); + regval = getreg32(base + KINETIS_GPIO_PDDR_OFFSET); + if ((cfgset & _PIN_IO_MASK) == _PIN_INPUT) + { + /* Select GPIO input */ + + regval &= ~(1 << pin); + putreg32(regval, base + KINETIS_GPIO_PDDR_OFFSET); + } + else /* if ((cfgset & _PIN_IO_MASK) == _PIN_OUTPUT) */ + { + /* Select GPIO input */ + + regval |= (1 << pin); + putreg32(regval, base + KINETIS_GPIO_PDDR_OFFSET); + + /* Set the initial value of the GPIO output */ + + kinetis_gpiowrite(cfgset, ((cfgset & GPIO_OUTPUT_ONE) != 0)); + } + } + } + + return OK; + } + return -EINVAL; +} + +/************************************************************************************ + * Name: kinetis_pinfilter + * + * Description: + * Configure the digital filter associated with a port. The digital filter + * capabilities of the PORT module are available in all digital pin muxing modes. + * + * Input parmeters: + * port - Port number. See KINETIS_PORTn definitions in kinetis_port.h + * lpo - true: Digital Filters are clocked by the bus clock + * false: Digital Filters are clocked by the 1 kHz LPO clock + * width - Filter Length + * + ************************************************************************************/ + +int kinetis_pinfilter(unsigned int port, bool lpo, unsigned int width) +{ + uintptr_t base; + uint32_t regval; + + DEBUGASSERT(port < KINETIS_NPORTS); + if (port < KINETIS_NPORTS) + { + /* Get the base address of PORT block for this port */ + + base = KINETIS_PORT_BASE(port); + + /* Select clocking */ + + regval = (lpo ? PORT_DFCR_CS : 0); + putreg32(regval, base + KINETIS_PORT_DFCR_OFFSET); + + /* Select the filter width */ + + DEBUGASSERT(width < 32); + putreg32(width, base + KINETIS_PORT_DFWR_OFFSET); + return OK; + } + return -EINVAL; +} |