diff options
Diffstat (limited to 'at91lib/peripherals/pio')
| -rw-r--r-- | at91lib/peripherals/pio/pio.c | 346 | ||||
| -rw-r--r-- | at91lib/peripherals/pio/pio.h | 163 | ||||
| -rw-r--r-- | at91lib/peripherals/pio/pio_it.c | 395 | ||||
| -rw-r--r-- | at91lib/peripherals/pio/pio_it.h | 83 |
4 files changed, 987 insertions, 0 deletions
diff --git a/at91lib/peripherals/pio/pio.c b/at91lib/peripherals/pio/pio.c new file mode 100644 index 0000000..5b21751 --- /dev/null +++ b/at91lib/peripherals/pio/pio.c @@ -0,0 +1,346 @@ +/* ----------------------------------------------------------------------------
+ * 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);
+}
+
diff --git a/at91lib/peripherals/pio/pio.h b/at91lib/peripherals/pio/pio.h new file mode 100644 index 0000000..69fe29d --- /dev/null +++ b/at91lib/peripherals/pio/pio.h @@ -0,0 +1,163 @@ +/* ----------------------------------------------------------------------------
+ * 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.
+ * ----------------------------------------------------------------------------
+ */
+
+//------------------------------------------------------------------------------
+/// \unit
+///
+/// !!!Purpose
+///
+/// This file provides a basic API for PIO configuration and usage of
+/// user-controlled pins. Please refer to the board.h file for a list of
+/// available pin definitions.
+///
+/// !!!Usage
+///
+/// -# Define a constant pin description array such as the following one, using
+/// the existing definitions provided by the board.h file if possible:
+/// \code
+/// const Pin pPins[] = {PIN_USART0_TXD, PIN_USART0_RXD};
+/// \endcode
+/// Alternatively, it is possible to add new pins by provided the full Pin
+/// structure:
+/// \code
+/// // Pin instance to configure PA10 & PA11 as inputs with the internal
+/// // pull-up enabled.
+/// const Pin pPins = {
+/// (1 << 10) | (1 << 11),
+/// AT91C_BASE_PIOA,
+/// AT91C_ID_PIOA,
+/// PIO_INPUT,
+/// PIO_PULLUP
+/// };
+/// \endcode
+/// -# Configure a pin array by calling PIO_Configure() with a pointer to the
+/// array and its size (which is computed using the PIO_LISTSIZE macro).
+/// -# Change and get the value of a user-controlled pin using the PIO_Set,
+/// PIO_Clear and PIO_Get methods.
+/// -# Get the level being currently output by a user-controlled pin configured
+/// as an output using PIO_GetOutputDataStatus().
+//------------------------------------------------------------------------------
+
+#ifndef PIO_H
+#define PIO_H
+
+//------------------------------------------------------------------------------
+// Headers
+//------------------------------------------------------------------------------
+
+#include <board.h>
+
+//------------------------------------------------------------------------------
+// Global Definitions
+//------------------------------------------------------------------------------
+
+/// The pin is controlled by the associated signal of peripheral A.
+#define PIO_PERIPH_A 0
+/// The pin is controlled by the associated signal of peripheral B.
+#define PIO_PERIPH_B 1
+/// The pin is an input.
+#define PIO_INPUT 2
+/// The pin is an output and has a default level of 0.
+#define PIO_OUTPUT_0 3
+/// The pin is an output and has a default level of 1.
+#define PIO_OUTPUT_1 4
+
+/// Default pin configuration (no attribute).
+#define PIO_DEFAULT (0 << 0)
+/// The internal pin pull-up is active.
+#define PIO_PULLUP (1 << 0)
+/// The internal glitch filter is active.
+#define PIO_DEGLITCH (1 << 1)
+/// The pin is open-drain.
+#define PIO_OPENDRAIN (1 << 2)
+
+//------------------------------------------------------------------------------
+// Global Macros
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+/// Calculates the size of an array of Pin instances. The array must be defined
+/// locally (i.e. not a pointer), otherwise the computation will not be correct.
+/// \param pPins Local array of Pin instances.
+/// \return Number of elements in array.
+//------------------------------------------------------------------------------
+#define PIO_LISTSIZE(pPins) (sizeof(pPins) / sizeof(Pin))
+
+//------------------------------------------------------------------------------
+// Global Types
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+/// Describes the type and attribute of one PIO pin or a group of similar pins.
+/// The #type# field can have the following values:
+/// - PIO_PERIPH_A
+/// - PIO_PERIPH_B
+/// - PIO_OUTPUT_0
+/// - PIO_OUTPUT_1
+/// - PIO_INPUT
+///
+/// The #attribute# field is a bitmask that can either be set to PIO_DEFAULt,
+/// or combine (using bitwise OR '|') any number of the following constants:
+/// - PIO_PULLUP
+/// - PIO_DEGLITCH
+/// - PIO_OPENDRAIN
+//------------------------------------------------------------------------------
+typedef struct {
+
+ /// Bitmask indicating which pin(s) to configure.
+ unsigned int mask;
+ /// Pointer to the PIO controller which has the pin(s).
+ AT91S_PIO *pio;
+ /// Peripheral ID of the PIO controller which has the pin(s).
+ unsigned char id;
+ /// Pin type.
+ unsigned char type;
+ /// Pin attribute.
+ unsigned char attribute;
+
+} Pin;
+
+//------------------------------------------------------------------------------
+// Global Functions
+//------------------------------------------------------------------------------
+
+extern unsigned char PIO_Configure(const Pin *list, unsigned int size);
+
+extern void PIO_Set(const Pin *pin);
+
+extern void PIO_Clear(const Pin *pin);
+
+extern unsigned char PIO_Get(const Pin *pin);
+
+extern unsigned int PIO_GetISR(const Pin *pin);
+
+extern unsigned char PIO_GetOutputDataStatus(const Pin *pin);
+
+#endif //#ifndef PIO_H
+
diff --git a/at91lib/peripherals/pio/pio_it.c b/at91lib/peripherals/pio/pio_it.c new file mode 100644 index 0000000..266feb0 --- /dev/null +++ b/at91lib/peripherals/pio/pio_it.c @@ -0,0 +1,395 @@ +/* ----------------------------------------------------------------------------
+ * 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.
+ * ----------------------------------------------------------------------------
+ */
+
+/// Disable traces for this file
+#undef TRACE_LEVEL
+#define TRACE_LEVEL 0
+
+//------------------------------------------------------------------------------
+// Headers
+//------------------------------------------------------------------------------
+
+#include "pio_it.h"
+#include "pio.h"
+#include <board.h>
+#include <aic/aic.h>
+#include <utility/assert.h>
+#include <utility/trace.h>
+
+//------------------------------------------------------------------------------
+// Local definitions
+//------------------------------------------------------------------------------
+
+/// \exclude
+/// Maximum number of interrupt sources that can be defined. This
+/// constant can be increased, but the current value is the smallest possible
+/// that will be compatible with all existing projects.
+#define MAX_INTERRUPT_SOURCES 7
+
+//------------------------------------------------------------------------------
+// Local types
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+/// \exclude
+/// Describes a PIO interrupt source, including the PIO instance triggering the
+/// interrupt and the associated interrupt handler.
+//------------------------------------------------------------------------------
+typedef struct {
+
+ /// Pointer to the source pin instance.
+ const Pin *pPin;
+
+ /// Interrupt handler.
+ void (*handler)(const Pin *);
+
+} InterruptSource;
+
+//------------------------------------------------------------------------------
+// Local variables
+//------------------------------------------------------------------------------
+
+/// List of interrupt sources.
+static InterruptSource pSources[MAX_INTERRUPT_SOURCES];
+
+/// Number of currently defined interrupt sources.
+static unsigned int numSources;
+
+//------------------------------------------------------------------------------
+// Local functions
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+/// Handles all interrupts on the given PIO controller.
+/// \param id PIO controller ID.
+/// \param pPio PIO controller base address.
+//------------------------------------------------------------------------------
+static void PioInterruptHandler(unsigned int id, AT91S_PIO *pPio)
+{
+ unsigned int status;
+ unsigned int i;
+
+ // Read PIO controller status
+ status = pPio->PIO_ISR;
+ status &= pPio->PIO_IMR;
+
+ // Check pending events
+ if (status != 0) {
+
+ TRACE_DEBUG("PIO interrupt on PIO controller #%d\n\r", id);
+
+ // Find triggering source
+ i = 0;
+ while (status != 0) {
+
+ // There cannot be an unconfigured source enabled.
+ SANITY_CHECK(i < numSources);
+
+ // Source is configured on the same controller
+ if (pSources[i].pPin->id == id) {
+
+ // Source has PIOs whose statuses have changed
+ if ((status & pSources[i].pPin->mask) != 0) {
+
+ TRACE_DEBUG("Interrupt source #%d triggered\n\r", i);
+
+ pSources[i].handler(pSources[i].pPin);
+ status &= ~(pSources[i].pPin->mask);
+ }
+ }
+ i++;
+ }
+ }
+}
+
+//------------------------------------------------------------------------------
+/// Generic PIO interrupt handler. Single entry point for interrupts coming
+/// from any PIO controller (PIO A, B, C ...). Dispatches the interrupt to
+/// the user-configured handlers.
+//------------------------------------------------------------------------------
+static void InterruptHandler(void)
+{
+#if defined(AT91C_ID_PIOA)
+ // Treat PIOA interrupts
+ PioInterruptHandler(AT91C_ID_PIOA, AT91C_BASE_PIOA);
+#endif
+
+#if defined(AT91C_ID_PIOB)
+ // Treat PIOB interrupts
+ PioInterruptHandler(AT91C_ID_PIOB, AT91C_BASE_PIOB);
+#endif
+
+#if defined(AT91C_ID_PIOC)
+ // Treat PIOC interrupts
+ PioInterruptHandler(AT91C_ID_PIOC, AT91C_BASE_PIOC);
+#endif
+
+#if defined(AT91C_ID_PIOD)
+ // Treat PIOD interrupts
+ PioInterruptHandler(AT91C_ID_PIOD, AT91C_BASE_PIOD);
+#endif
+
+#if defined(AT91C_ID_PIOE)
+ // Treat PIOE interrupts
+ PioInterruptHandler(AT91C_ID_PIOE, AT91C_BASE_PIOE);
+#endif
+
+#if defined(AT91C_ID_PIOABCD)
+ // Treat PIOABCD interrupts
+ #if !defined(AT91C_ID_PIOA)
+ PioInterruptHandler(AT91C_ID_PIOABCD, AT91C_BASE_PIOA);
+ #endif
+ #if !defined(AT91C_ID_PIOB)
+ PioInterruptHandler(AT91C_ID_PIOABCD, AT91C_BASE_PIOB);
+ #endif
+ #if !defined(AT91C_ID_PIOC)
+ PioInterruptHandler(AT91C_ID_PIOABCD, AT91C_BASE_PIOC);
+ #endif
+ #if !defined(AT91C_ID_PIOD)
+ PioInterruptHandler(AT91C_ID_PIOABCD, AT91C_BASE_PIOD);
+ #endif
+#endif
+
+#if defined(AT91C_ID_PIOABCDE)
+ // Treat PIOABCDE interrupts
+ #if !defined(AT91C_ID_PIOA)
+ PioInterruptHandler(AT91C_ID_PIOABCDE, AT91C_BASE_PIOA);
+ #endif
+ #if !defined(AT91C_ID_PIOB)
+ PioInterruptHandler(AT91C_ID_PIOABCDE, AT91C_BASE_PIOB);
+ #endif
+ #if !defined(AT91C_ID_PIOC)
+ PioInterruptHandler(AT91C_ID_PIOABCDE, AT91C_BASE_PIOC);
+ #endif
+ #if !defined(AT91C_ID_PIOD)
+ PioInterruptHandler(AT91C_ID_PIOABCDE, AT91C_BASE_PIOD);
+ #endif
+ #if !defined(AT91C_ID_PIOE)
+ PioInterruptHandler(AT91C_ID_PIOABCDE, AT91C_BASE_PIOE);
+ #endif
+#endif
+
+#if defined(AT91C_ID_PIOCDE)
+ // Treat PIOCDE interrupts
+ #if !defined(AT91C_ID_PIOC)
+ PioInterruptHandler(AT91C_ID_PIOCDE, AT91C_BASE_PIOC);
+ #endif
+ #if !defined(AT91C_ID_PIOD)
+ PioInterruptHandler(AT91C_ID_PIOCDE, AT91C_BASE_PIOD);
+ #endif
+ #if !defined(AT91C_ID_PIOE)
+ PioInterruptHandler(AT91C_ID_PIOCDE, AT91C_BASE_PIOE);
+ #endif
+#endif
+}
+
+//------------------------------------------------------------------------------
+// Global functions
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+/// Initializes the PIO interrupt management logic. The desired priority of PIO
+/// interrupts must be provided. Calling this function multiple times result in
+/// the reset of currently configured interrupts.
+/// \param priority PIO controller interrupts priority.
+//------------------------------------------------------------------------------
+void PIO_InitializeInterrupts(unsigned int priority)
+{
+ TRACE_DEBUG("PIO_Initialize()\n\r");
+
+ SANITY_CHECK((priority & ~AT91C_AIC_PRIOR) == 0);
+
+ // Reset sources
+ numSources = 0;
+
+#ifdef AT91C_ID_PIOA
+ // Configure PIO interrupt sources
+ TRACE_DEBUG("PIO_Initialize: Configuring PIOA\n\r");
+ AT91C_BASE_PMC->PMC_PCER = 1 << AT91C_ID_PIOA;
+ AT91C_BASE_PIOA->PIO_ISR;
+ AT91C_BASE_PIOA->PIO_IDR = 0xFFFFFFFF;
+ AIC_ConfigureIT(AT91C_ID_PIOA, priority, InterruptHandler);
+ AIC_EnableIT(AT91C_ID_PIOA);
+#endif
+
+#ifdef AT91C_ID_PIOB
+ TRACE_DEBUG("PIO_Initialize: Configuring PIOB\n\r");
+ AT91C_BASE_PMC->PMC_PCER = 1 << AT91C_ID_PIOB;
+ AT91C_BASE_PIOB->PIO_ISR;
+ AT91C_BASE_PIOB->PIO_IDR = 0xFFFFFFFF;
+ AIC_ConfigureIT(AT91C_ID_PIOB, priority, InterruptHandler);
+ AIC_EnableIT(AT91C_ID_PIOB);
+#endif
+
+#ifdef AT91C_ID_PIOC
+ TRACE_DEBUG("PIO_Initialize: Configuring PIOC\n\r");
+ AT91C_BASE_PMC->PMC_PCER = 1 << AT91C_ID_PIOC;
+ AT91C_BASE_PIOC->PIO_ISR;
+ AT91C_BASE_PIOC->PIO_IDR = 0xFFFFFFFF;
+ AIC_ConfigureIT(AT91C_ID_PIOC, priority, InterruptHandler);
+ AIC_EnableIT(AT91C_ID_PIOC);
+#endif
+
+#ifdef AT91C_ID_PIOD
+ TRACE_DEBUG("PIO_Initialize: Configuring PIOD\n\r");
+ AT91C_BASE_PMC->PMC_PCER = 1 << AT91C_ID_PIOD;
+ AT91C_BASE_PIOC->PIO_ISR;
+ AT91C_BASE_PIOC->PIO_IDR = 0xFFFFFFFF;
+ AIC_ConfigureIT(AT91C_ID_PIOD, priority, InterruptHandler);
+ AIC_EnableIT(AT91C_ID_PIOD);
+#endif
+
+#ifdef AT91C_ID_PIOE
+ TRACE_DEBUG("PIO_Initialize: Configuring PIOE\n\r");
+ AT91C_BASE_PMC->PMC_PCER = 1 << AT91C_ID_PIOE;
+ AT91C_BASE_PIOC->PIO_ISR;
+ AT91C_BASE_PIOC->PIO_IDR = 0xFFFFFFFF;
+ AIC_ConfigureIT(AT91C_ID_PIOE, priority, InterruptHandler);
+ AIC_EnableIT(AT91C_ID_PIOE);
+#endif
+
+#if defined(AT91C_ID_PIOABCD)
+ // Treat PIOABCD interrupts
+ #if !defined(AT91C_ID_PIOA) \
+ && !defined(AT91C_ID_PIOB) \
+ && !defined(AT91C_ID_PIOC) \
+ && !defined(AT91C_ID_PIOD)
+
+ TRACE_DEBUG("PIO_Initialize: Configuring PIOABCD\n\r");
+ AT91C_BASE_PMC->PMC_PCER = 1 << AT91C_ID_PIOABCD;
+ AT91C_BASE_PIOA->PIO_ISR;
+ AT91C_BASE_PIOA->PIO_IDR = 0xFFFFFFFF;
+ AIC_ConfigureIT(AT91C_ID_PIOABCD, priority, InterruptHandler);
+ AIC_EnableIT(AT91C_ID_PIOABCD);
+ #endif
+#endif
+
+#if defined(AT91C_ID_PIOABCDE)
+ // Treat PIOABCDE interrupts
+ #if !defined(AT91C_ID_PIOA) \
+ && !defined(AT91C_ID_PIOB) \
+ && !defined(AT91C_ID_PIOC) \
+ && !defined(AT91C_ID_PIOD) \
+ && !defined(AT91C_ID_PIOE)
+
+ TRACE_DEBUG("PIO_Initialize: Configuring PIOABCDE\n\r");
+ AT91C_BASE_PMC->PMC_PCER = 1 << AT91C_ID_PIOABCDE;
+ AT91C_BASE_PIOA->PIO_ISR;
+ AT91C_BASE_PIOA->PIO_IDR = 0xFFFFFFFF;
+ AIC_ConfigureIT(AT91C_ID_PIOABCDE, priority, InterruptHandler);
+ AIC_EnableIT(AT91C_ID_PIOABCDE);
+ #endif
+#endif
+
+#if defined(AT91C_ID_PIOCDE)
+ // Treat PIOCDE interrupts
+ #if !defined(AT91C_ID_PIOC) \
+ && !defined(AT91C_ID_PIOD) \
+ && !defined(AT91C_ID_PIOE)
+
+ TRACE_DEBUG("PIO_Initialize: Configuring PIOC\n\r");
+ AT91C_BASE_PMC->PMC_PCER = 1 << AT91C_ID_PIOCDE;
+ AT91C_BASE_PIOC->PIO_ISR;
+ AT91C_BASE_PIOC->PIO_IDR = 0xFFFFFFFF;
+ AIC_ConfigureIT(AT91C_ID_PIOCDE, priority, InterruptHandler);
+ AIC_EnableIT(AT91C_ID_PIOCDE);
+ #endif
+#endif
+}
+
+//------------------------------------------------------------------------------
+/// Configures a PIO or a group of PIO to generate an interrupt on status
+/// change. The provided interrupt handler will be called with the triggering
+/// pin as its parameter (enabling different pin instances to share the same
+/// handler).
+/// \param pPin Pointer to a Pin instance.
+/// \param handler Interrupt handler function pointer.
+//------------------------------------------------------------------------------
+void PIO_ConfigureIt(const Pin *pPin, void (*handler)(const Pin *))
+{
+ InterruptSource *pSource;
+
+ TRACE_DEBUG("PIO_ConfigureIt()\n\r");
+
+ SANITY_CHECK(pPin);
+ ASSERT(numSources < MAX_INTERRUPT_SOURCES,
+ "-F- PIO_ConfigureIt: Increase MAX_INTERRUPT_SOURCES\n\r");
+
+ // Define new source
+ TRACE_DEBUG("PIO_ConfigureIt: Defining new source #%d.\n\r", numSources);
+
+ pSource = &(pSources[numSources]);
+ pSource->pPin = pPin;
+ pSource->handler = handler;
+ numSources++;
+}
+
+//------------------------------------------------------------------------------
+/// Enables the given interrupt source if it has been configured. The status
+/// register of the corresponding PIO controller is cleared prior to enabling
+/// the interrupt.
+/// \param pPin Interrupt source to enable.
+//------------------------------------------------------------------------------
+void PIO_EnableIt(const Pin *pPin)
+{
+ TRACE_DEBUG("PIO_EnableIt()\n\r");
+
+ SANITY_CHECK(pPin);
+
+#ifndef NOASSERT
+ unsigned int i = 0;
+ unsigned char found = 0;
+ while ((i < numSources) && !found) {
+
+ if (pSources[i].pPin == pPin) {
+
+ found = 1;
+ }
+ i++;
+ }
+ ASSERT(found, "-F- PIO_EnableIt: Interrupt source has not been configured\n\r");
+#endif
+
+ pPin->pio->PIO_ISR;
+ pPin->pio->PIO_IER = pPin->mask;
+}
+
+//------------------------------------------------------------------------------
+/// Disables a given interrupt source, with no added side effects.
+/// \param pPin Interrupt source to disable.
+//------------------------------------------------------------------------------
+void PIO_DisableIt(const Pin *pPin)
+{
+ SANITY_CHECK(pPin);
+
+ TRACE_DEBUG("PIO_DisableIt()\n\r");
+
+ pPin->pio->PIO_IDR = pPin->mask;
+}
+
diff --git a/at91lib/peripherals/pio/pio_it.h b/at91lib/peripherals/pio/pio_it.h new file mode 100644 index 0000000..0fcf7be --- /dev/null +++ b/at91lib/peripherals/pio/pio_it.h @@ -0,0 +1,83 @@ +/* ----------------------------------------------------------------------------
+ * 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.
+ * ----------------------------------------------------------------------------
+ */
+
+//------------------------------------------------------------------------------
+/// \unit
+///
+/// !!!Purpose
+///
+/// Configuration and handling of interrupts on PIO status changes. The API
+/// provided here have several advantages over the traditional PIO interrupt
+/// configuration approach:
+/// - It is highly portable
+/// - It automatically demultiplexes interrupts when multiples pins have been
+/// configured on a single PIO controller
+/// - It allows a group of pins to share the same interrupt
+///
+/// However, it also has several minor drawbacks that may prevent from using it
+/// in particular applications:
+/// - It enables the clocks of all PIO controllers
+/// - PIO controllers all share the same interrupt handler, which does the
+/// demultiplexing and can be slower than direct configuration
+/// - It reserves space for a fixed number of interrupts, which can be
+/// increased by modifying the appropriate constant in pio_it.c.
+///
+/// !!!Usage
+///
+/// -# Initialize the PIO interrupt mechanism using PIO_InitializeInterrupts()
+/// with the desired priority (0 ... 7).
+/// -# Configure a status change interrupt on one or more pin(s) with
+/// PIO_ConfigureIt().
+/// -# Enable & disable interrupts on pins using PIO_EnableIt() and
+/// PIO_DisableIt().
+//------------------------------------------------------------------------------
+
+#ifndef PIO_IT_H
+#define PIO_IT_H
+
+//------------------------------------------------------------------------------
+// Headers
+//------------------------------------------------------------------------------
+
+#include "pio.h"
+
+//------------------------------------------------------------------------------
+// Global functions
+//------------------------------------------------------------------------------
+
+extern void PIO_InitializeInterrupts(unsigned int priority);
+
+extern void PIO_ConfigureIt(const Pin *pPin, void (*handler)(const Pin *));
+
+extern void PIO_EnableIt(const Pin *pPin);
+
+extern void PIO_DisableIt(const Pin *pPin);
+
+#endif //#ifndef PIO_IT_H
+
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