Diff: targets/TARGET_Silicon_Labs/TARGET_EFM32/emlib/src/em_prs.c

Revision:

149:156823d33999

Parent:

144:ef7eb2e8f9f7

Child:

150:02e0a0aed4ec

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_Silicon_Labs/TARGET_EFM32/emlib/src/em_prs.c	Fri Oct 28 11:17:30 2016 +0100
@@ -0,0 +1,126 @@
+/***************************************************************************//**
+ * @file em_prs.c
+ * @brief Peripheral Reflex System (PRS) Peripheral API
+ * @version 4.2.1
+ *******************************************************************************
+ * @section License
+ * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b>
+ *******************************************************************************
+ *
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ *
+ * 1. The origin of this software must not be misrepresented; you must not
+ *    claim that you wrote the original software.
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ *    misrepresented as being the original software.
+ * 3. This notice may not be removed or altered from any source distribution.
+ *
+ * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Silicon Labs has no
+ * obligation to support this Software. Silicon Labs is providing the
+ * Software "AS IS", with no express or implied warranties of any kind,
+ * including, but not limited to, any implied warranties of merchantability
+ * or fitness for any particular purpose or warranties against infringement
+ * of any proprietary rights of a third party.
+ *
+ * Silicon Labs will not be liable for any consequential, incidental, or
+ * special damages, or any other relief, or for any claim by any third party,
+ * arising from your use of this Software.
+ *
+ ******************************************************************************/
+
+#include "em_prs.h"
+#if defined(PRS_COUNT) && (PRS_COUNT > 0)
+
+#include "em_assert.h"
+
+/***************************************************************************//**
+ * @addtogroup EM_Library
+ * @{
+ ******************************************************************************/
+
+/***************************************************************************//**
+ * @addtogroup PRS
+ * @brief Peripheral Reflex System (PRS) Peripheral API
+ * @{
+ ******************************************************************************/
+
+/*******************************************************************************
+ **************************   GLOBAL FUNCTIONS   *******************************
+ ******************************************************************************/
+
+/***************************************************************************//**
+ * @brief
+ *   Set source and signal to be used for a channel.
+ *
+ * @param[in] ch
+ *   Channel to define signal and source for.
+ *
+ * @param[in] source
+ *   Source to select for channel. Use one of PRS_CH_CTRL_SOURCESEL_x defines.
+ *
+ * @param[in] signal
+ *   Signal (for selected @p source) to use. Use one of PRS_CH_CTRL_SIGSEL_x
+ *   defines.
+ *
+ * @param[in] edge
+ *   Edge (for selected source/signal) to generate pulse for.
+ ******************************************************************************/
+void PRS_SourceSignalSet(unsigned int ch,
+                         uint32_t source,
+                         uint32_t signal,
+                         PRS_Edge_TypeDef edge)
+{
+  EFM_ASSERT(ch < PRS_CHAN_COUNT);
+
+  PRS->CH[ch].CTRL = (source & _PRS_CH_CTRL_SOURCESEL_MASK)
+                     | (signal & _PRS_CH_CTRL_SIGSEL_MASK)
+                     | (uint32_t)edge;
+}
+
+#if defined( PRS_CH_CTRL_ASYNC )
+/***************************************************************************//**
+ * @brief
+ *   Set source and asynchronous signal to be used for a channel.
+ *
+ * @details
+ *   Asynchronous reflexes are not clocked on HFPERCLK, and can be used even in
+ *   EM2/EM3.
+ *   There is a limitation to reflexes operating in asynchronous mode: they can
+ *   only be used by a subset of the reflex consumers. Please refer to PRS
+ *   chapter in the reference manual for the complete list of supported
+ *   asynchronous signals and consumers.
+ *
+ * @note
+ *   This function is not supported on EFM32GxxxFyyy parts.
+ *   In asynchronous mode, the edge detector only works in EM0, hence it shall
+ *   not be used. The EDSEL parameter in PRS_CHx_CTRL register is set to 0 (OFF)
+ *   by default.
+ *
+ * @param[in] ch
+ *   Channel to define source and asynchronous signal for.
+ *
+ * @param[in] source
+ *   Source to select for channel. Use one of PRS_CH_CTRL_SOURCESEL_x defines.
+ *
+ * @param[in] signal
+ *   Asynchronous signal (for selected @p source) to use. Use one of the
+ *   PRS_CH_CTRL_SIGSEL_x defines that support asynchronous operation.
+ ******************************************************************************/
+void PRS_SourceAsyncSignalSet(unsigned int ch,
+                              uint32_t source,
+                              uint32_t signal)
+{
+  EFM_ASSERT(ch < PRS_CHAN_COUNT);
+
+  PRS->CH[ch].CTRL = PRS_CH_CTRL_ASYNC
+                     | (source & _PRS_CH_CTRL_SOURCESEL_MASK)
+                     | (signal & _PRS_CH_CTRL_SIGSEL_MASK)
+                     | PRS_CH_CTRL_EDSEL_OFF;
+}
+#endif
+
+/** @} (end addtogroup PRS) */
+/** @} (end addtogroup EM_Library) */
+#endif /* defined(PRS_COUNT) && (PRS_COUNT > 0) */