switch to setup for Arduino Boards Manager

2025-11-03 13:04:48 -08:00 · 2015-06-23 12:42:35 -07:00
parent bc55c9bb45
commit 6ca6b114d5
3581 changed files with 93 additions and 51 deletions
--- a/digistump-sam/system/libsam/source/rtt.c
+++ b/digistump-sam/system/libsam/source/rtt.c
@@ -0,0 +1,132 @@
+/* ----------------------------------------------------------------------------
+ *         SAM Software Package License
+ * ----------------------------------------------------------------------------
+ * Copyright (c) 2011-2012, Atmel Corporation
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following condition is 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.
+ * ----------------------------------------------------------------------------
+ */
+
+/** \addtogroup rtt_module Working with RTT
+ * The RTT driver provides the interface to configure and use the RTT
+ * peripheral.
+ *
+ * The Real-time Timer is used to count elapsed seconds.\n
+ * This timer is clocked by the 32kHz system clock divided by a programmable
+ * 16-bit balue. To be accurate, it is better to use an
+ * external 32kHz crystal instead of the internal 32kHz RC.\n
+ *
+ * To count elapsed seconds, the user could follow these few steps:
+ * <ul>
+ * <li>Programming PTPRES in RTT_MR to feeding the timer with a 1Hz signal.</li>
+ * <li>Writing the bit RTTRST in RTT_MR to restart the timer with new settings.</li>
+ * </ul>
+ *
+ * An alarm can be set to happen on second by setting alarm value in RTT_AR.
+ * Alarm occurence can be detected by polling or interrupt.
+ *
+ * For more accurate information, please look at the RTT section of the
+ * Datasheet.
+ *
+ * Related files :\n
+ * \ref rtt.c\n
+ * \ref rtt.h.\n
+ */
+/*@{*/
+/*@}*/
+
+/**
+ * \file
+ *
+ * Implementation of Real Time Timer (RTT) controller.
+ *
+ */
+
+/*----------------------------------------------------------------------------
+ *        Headers
+ *----------------------------------------------------------------------------*/
+#include "chip.h"
+
+#include <assert.h>
+
+/*----------------------------------------------------------------------------
+ *        Exported functions
+ *----------------------------------------------------------------------------*/
+
+/**
+ * \brief Changes the prescaler value of the given RTT and restarts it.
+ *
+ * \note This function disables RTT interrupt sources.
+ *
+ * \param rtt  Pointer to a Rtt instance.
+ * \param prescaler  Prescaler value for the RTT.
+ */
+void RTT_SetPrescaler(Rtt *rtt, uint16_t prescaler)
+{
+    rtt->RTT_MR = (prescaler |  RTT_MR_RTTRST);
+}
+
+/**
+ * \brief Returns the current value of the RTT timer value.
+ *
+ * \param rtt  Pointer to a Rtt instance.
+ */
+uint32_t RTT_GetTime(Rtt *rtt)
+{
+    return rtt->RTT_VR;
+}
+
+/**
+ * \brief Enables the specified RTT interrupt sources.
+ *
+ * \param rtt  Pointer to a Rtt instance.
+ * \param sources  Bitmask of interrupts to enable.
+ */
+void RTT_EnableIT(Rtt *rtt, uint32_t sources)
+{
+    assert( (sources & 0x0004FFFF) == 0 ) ;
+    rtt->RTT_MR |= sources;
+}
+
+/**
+ * \brief Returns the status register value of the given RTT.
+ *
+ * \param rtt  Pointer to an Rtt instance.
+ */
+uint32_t RTT_GetStatus(Rtt *rtt)
+{
+    return rtt->RTT_SR;
+}
+
+/**
+ * \brief Configures the RTT to generate an alarm at the given time.
+ *
+ * \param pRtt  Pointer to an Rtt instance.
+ * \param time  Alarm time.
+ */
+void RTT_SetAlarm(Rtt *pRtt, uint32_t time)
+{
+    assert(time > 0);
+
+    pRtt->RTT_AR = time - 1;
+}