diff options
Diffstat (limited to 'at91lib/peripherals/pio/pio_it.c')
| -rw-r--r-- | at91lib/peripherals/pio/pio_it.c | 395 |
1 files changed, 395 insertions, 0 deletions
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;
+}
+
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