pio.c
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- /* ----------------------------------------------------------------------------
- * ATMEL Microcontroller Software Support
- * ----------------------------------------------------------------------------
- * Copyright (c) 2008, Atmel Corporation
- *
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * - Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the disclaimer below.
- *
- * Atmel's name may not be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
- * DISCLAIMED. IN NO EVENT SHALL ATMEL 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.
- * ----------------------------------------------------------------------------
- */
- //------------------------------------------------------------------------------
- // Headers
- //------------------------------------------------------------------------------
- #include "pio.h"
- #include <board.h>
- //------------------------------------------------------------------------------
- // Local Functions
- //------------------------------------------------------------------------------
- //------------------------------------------------------------------------------
- /// Configures one or more pin(s) of a PIO controller as being controlled by
- /// peripheral A. Optionally, the corresponding internal pull-up(s) can be
- /// enabled.
- /// param pio Pointer to a PIO controller.
- /// param mask Bitmask of one or more pin(s) to configure.
- /// param enablePullUp Indicates if the pin(s) internal pull-up shall be
- /// configured.
- //------------------------------------------------------------------------------
- static void PIO_SetPeripheralA(
- AT91S_PIO *pio,
- unsigned int mask,
- unsigned char enablePullUp)
- {
- // Disable interrupts on the pin(s)
- pio->PIO_IDR = mask;
- // Enable the pull-up(s) if necessary
- if (enablePullUp) {
- pio->PIO_PPUER = mask;
- }
- else {
- pio->PIO_PPUDR = mask;
- }
- // Configure pin
- pio->PIO_ASR = mask;
- pio->PIO_PDR = mask;
- }
- //------------------------------------------------------------------------------
- /// Configures one or more pin(s) of a PIO controller as being controlled by
- /// peripheral B. Optionally, the corresponding internal pull-up(s) can be
- /// enabled.
- /// param pio Pointer to a PIO controller.
- /// param mask Bitmask of one or more pin(s) to configure.
- /// param enablePullUp Indicates if the pin(s) internal pull-up shall be
- /// configured.
- //------------------------------------------------------------------------------
- static void PIO_SetPeripheralB(
- AT91S_PIO *pio,
- unsigned int mask,
- unsigned char enablePullUp)
- {
- // Disable interrupts on the pin(s)
- pio->PIO_IDR = mask;
- // Enable the pull-up(s) if necessary
- if (enablePullUp) {
- pio->PIO_PPUER = mask;
- }
- else {
- pio->PIO_PPUDR = mask;
- }
- // Configure pin
- pio->PIO_BSR = mask;
- pio->PIO_PDR = mask;
- }
- //------------------------------------------------------------------------------
- /// Configures one or more pin(s) or a PIO controller as inputs. Optionally,
- /// the corresponding internal pull-up(s) and glitch filter(s) can be
- /// enabled.
- /// param pio Pointer to a PIO controller.
- /// param mask Bitmask indicating which pin(s) to configure as input(s).
- /// param enablePullUp Indicates if the internal pull-up(s) must be enabled.
- /// param enableFilter Indicates if the glitch filter(s) must be enabled.
- //------------------------------------------------------------------------------
- static void PIO_SetInput(
- AT91S_PIO *pio,
- unsigned int mask,
- unsigned char enablePullUp,
- unsigned char enableFilter)
- {
- // Disable interrupts
- pio->PIO_IDR = mask;
- // Enable pull-up(s) if necessary
- if (enablePullUp) {
-
- pio->PIO_PPUER = mask;
- }
- else {
-
- pio->PIO_PPUDR = mask;
- }
- // Enable filter(s) if necessary
- if (enableFilter) {
-
- pio->PIO_IFER = mask;
- }
- else {
-
- pio->PIO_IFDR = mask;
- }
- // Configure pin as input
- pio->PIO_ODR = mask;
- pio->PIO_PER = mask;
- }
- //------------------------------------------------------------------------------
- /// Configures one or more pin(s) of a PIO controller as outputs, with the
- /// given default value. Optionally, the multi-drive feature can be enabled
- /// on the pin(s).
- /// param pio Pointer to a PIO controller.
- /// param mask Bitmask indicating which pin(s) to configure.
- /// param defaultValue Default level on the pin(s).
- /// param enableMultiDrive Indicates if the pin(s) shall be configured as
- /// open-drain.
- /// param enablePullUp Indicates if the pin shall have its pull-up activated.
- //------------------------------------------------------------------------------
- static void PIO_SetOutput(
- AT91S_PIO *pio,
- unsigned int mask,
- unsigned char defaultValue,
- unsigned char enableMultiDrive,
- unsigned char enablePullUp)
- {
- // Disable interrupts
- pio->PIO_IDR = mask;
- // Enable pull-up(s) if necessary
- if (enablePullUp) {
-
- pio->PIO_PPUER = mask;
- }
- else {
-
- pio->PIO_PPUDR = mask;
- }
- // Enable multi-drive if necessary
- if (enableMultiDrive) {
-
- pio->PIO_MDER = mask;
- }
- else {
-
- pio->PIO_MDDR = mask;
- }
- // Set default value
- if (defaultValue) {
- pio->PIO_SODR = mask;
- }
- else {
- pio->PIO_CODR = mask;
- }
- // Configure pin(s) as output(s)
- pio->PIO_OER = mask;
- pio->PIO_PER = mask;
- }
- //------------------------------------------------------------------------------
- // Global Functions
- //------------------------------------------------------------------------------
- //------------------------------------------------------------------------------
- /// Configures a list of Pin instances, each of which can either hold a single
- /// pin or a group of pins, depending on the mask value; all pins are configured
- /// by this function. The size of the array must also be provided and is easily
- /// computed using PIO_LISTSIZE whenever its length is not known in advance.
- /// param list Pointer to a list of Pin instances.
- /// param size Size of the Pin list (calculated using PIO_LISTSIZE).
- /// return 1 if the pins have been configured properly; otherwise 0.
- //------------------------------------------------------------------------------
- unsigned char PIO_Configure(const Pin *list, unsigned int size)
- {
- // Configure pins
- while (size > 0) {
-
- switch (list->type) {
-
- case PIO_PERIPH_A:
- PIO_SetPeripheralA(list->pio,
- list->mask,
- (list->attribute & PIO_PULLUP) ? 1 : 0);
- break;
-
- case PIO_PERIPH_B:
- PIO_SetPeripheralB(list->pio,
- list->mask,
- (list->attribute & PIO_PULLUP) ? 1 : 0);
- break;
-
- case PIO_INPUT:
- AT91C_BASE_PMC->PMC_PCER = 1 << list->id;
- PIO_SetInput(list->pio,
- list->mask,
- (list->attribute & PIO_PULLUP) ? 1 : 0,
- (list->attribute & PIO_DEGLITCH)? 1 : 0);
- break;
-
- case PIO_OUTPUT_0:
- case PIO_OUTPUT_1:
- PIO_SetOutput(list->pio,
- list->mask,
- (list->type == PIO_OUTPUT_1),
- (list->attribute & PIO_OPENDRAIN) ? 1 : 0,
- (list->attribute & PIO_PULLUP) ? 1 : 0);
- break;
-
- default: return 0;
- }
- list++;
- size--;
- }
- return 1;
- }
- //------------------------------------------------------------------------------
- /// Sets a high output level on all the PIOs defined in the given Pin instance.
- /// This has no immediate effects on PIOs that are not output, but the PIO
- /// controller will memorize the value they are changed to outputs.
- /// param pin Pointer to a Pin instance describing one or more pins.
- //------------------------------------------------------------------------------
- void PIO_Set(const Pin *pin)
- {
- pin->pio->PIO_SODR = pin->mask;
- }
- //------------------------------------------------------------------------------
- /// Sets a low output level on all the PIOs defined in the given Pin instance.
- /// This has no immediate effects on PIOs that are not output, but the PIO
- /// controller will memorize the value they are changed to outputs.
- /// param pin Pointer to a Pin instance describing one or more pins.
- //------------------------------------------------------------------------------
- void PIO_Clear(const Pin *pin)
- {
- pin->pio->PIO_CODR = pin->mask;
- }
- //------------------------------------------------------------------------------
- /// Returns 1 if one or more PIO of the given Pin instance currently have a high
- /// level; otherwise returns 0. This method returns the actual value that is
- /// being read on the pin. To return the supposed output value of a pin, use
- /// PIO_GetOutputDataStatus() instead.
- /// param pin Pointer to a Pin instance describing one or more pins.
- /// return 1 if the Pin instance contains at least one PIO that currently has
- /// a high level; otherwise 0.
- //------------------------------------------------------------------------------
- unsigned char PIO_Get(const Pin *pin)
- {
- unsigned int reg;
- if ((pin->type == PIO_OUTPUT_0) || (pin->type == PIO_OUTPUT_1)) {
- reg = pin->pio->PIO_ODSR;
- }
- else {
- reg = pin->pio->PIO_PDSR;
- }
- if ((reg & pin->mask) == 0) {
- return 0;
- }
- else {
- return 1;
- }
- }
- //------------------------------------------------------------------------------
- /// Returns 1 if one or more PIO of the given Pin are configured to output a
- /// high level (even if they are not output).
- /// To get the actual value of the pin, use PIO_Get() instead.
- /// param pin Pointer to a Pin instance describing one or more pins.
- /// return 1 if the Pin instance contains at least one PIO that is configured
- /// to output a high level; otherwise 0.
- //------------------------------------------------------------------------------
- unsigned char PIO_GetOutputDataStatus(const Pin *pin)
- {
- if ((pin->pio->PIO_ODSR & pin->mask) == 0) {
- return 0;
- }
- else {
- return 1;
- }
- }
- //------------------------------------------------------------------------------
- /// Returns the value of ISR for the PIO controller of the pin.
- /// Reading this register acknoledges all the ITs.
- /// param pin Pointer to a Pin instance describing one or more pins.
- //------------------------------------------------------------------------------
- unsigned int PIO_GetISR(const Pin *pin)
- {
- return (pin->pio->PIO_ISR);
- }