1 files changed, 93 insertions, 0 deletions
diff --git a/peripherals/rtt/rtt.c b/peripherals/rtt/rtt.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 "rtt.h"
+#include <utility/assert.h>
+
+//------------------------------------------------------------------------------
+//         Exported functions
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+/// Changes the prescaler value of the given RTT and restarts it. This function
+/// disables RTT interrupt sources.
+/// \param rtt  Pointer to a AT91S_RTTC instance.
+/// \param prescaler  Prescaler value for the RTT.
+//------------------------------------------------------------------------------
+void RTT_SetPrescaler(AT91S_RTTC *rtt, unsigned short prescaler)
+{
+    rtt->RTTC_RTMR = (prescaler | AT91C_RTTC_RTTRST);
+}
+
+//------------------------------------------------------------------------------
+/// Returns the current value of the RTT timer value.
+/// \param rtt  Pointer to a AT91S_RTTC instance.
+//------------------------------------------------------------------------------
+unsigned int RTT_GetTime(AT91S_RTTC *rtt)
+{
+    return rtt->RTTC_RTVR;
+}
+
+//------------------------------------------------------------------------------
+/// Enables the specified RTT interrupt sources.
+/// \param rtt  Pointer to a AT91S_RTTC instance.
+/// \param sources  Bitmask of interrupts to enable.
+//------------------------------------------------------------------------------
+void RTT_EnableIT(AT91S_RTTC *rtt, unsigned int sources)
+{
+    ASSERT((sources & 0x0004FFFF) == 0,
+           "RTT_EnableIT: Wrong sources value.\n\r");
+    rtt->RTTC_RTMR |= sources;
+}
+
+//------------------------------------------------------------------------------
+/// Returns the status register value of the given RTT.
+/// \param rtt  Pointer to an AT91S_RTTC instance.
+//------------------------------------------------------------------------------
+unsigned int RTT_GetStatus(AT91S_RTTC *rtt)
+{
+    return rtt->RTTC_RTSR;
+}
+
+//------------------------------------------------------------------------------
+/// Configures the RTT to generate an alarm at the given time.
+/// \param pRtt  Pointer to an AT91S_RTTC instance.
+/// \param time  Alarm time.
+//------------------------------------------------------------------------------
+void RTT_SetAlarm(AT91S_RTTC *pRtt, unsigned int time)
+{
+    SANITY_CHECK(time > 0);
+
+    pRtt->RTTC_RTAR = time - 1;
+}
+