Diff: targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/emlib/src/em_acmp.c

Revision:

0:9b334a45a8ff

Child:

50:a417edff4437

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/emlib/src/em_acmp.c	Thu Oct 01 15:25:22 2015 +0300
@@ -0,0 +1,320 @@
+/***************************************************************************//**
+ * @file em_acmp.c
+ * @brief Analog Comparator (ACMP) Peripheral API
+ * @version 3.20.12
+ *******************************************************************************
+ * @section License
+ * <b>(C) Copyright 2014 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_acmp.h"
+#if defined(ACMP_COUNT) && (ACMP_COUNT > 0)
+
+#include <stdbool.h>
+#include "em_bitband.h"
+#include "em_assert.h"
+
+/***************************************************************************//**
+ * @addtogroup EM_Library
+ * @{
+ ******************************************************************************/
+
+/***************************************************************************//**
+ * @addtogroup ACMP
+ * @brief Analog comparator (ACMP) Peripheral API
+ * @{
+ ******************************************************************************/
+
+/*******************************************************************************
+ *******************************   DEFINES   ***********************************
+ ******************************************************************************/
+
+/** @cond DO_NOT_INCLUDE_WITH_DOXYGEN */
+
+
+/** Validation of ACMP register block pointer reference
+ *  for assert statements. */
+#if (ACMP_COUNT == 1)
+#define ACMP_REF_VALID(ref)    ((ref) == ACMP0)
+#elif (ACMP_COUNT == 2)
+#define ACMP_REF_VALID(ref)    (((ref) == ACMP0) || ((ref) == ACMP1))
+#else
+#error Undefined number of analog comparators (ACMP).
+#endif
+
+/** @endcond */
+
+/*******************************************************************************
+ **************************   GLOBAL FUNCTIONS   *******************************
+ ******************************************************************************/
+
+/***************************************************************************//**
+ * @brief
+ *   Sets up the ACMP for use in capacative sense applications.
+ *
+ * @details
+ *   This function sets up the ACMP for use in capacacitve sense applications.
+ *   To use the capacative sense functionality in the ACMP you need to use
+ *   the PRS output of the ACMP module to count the number of oscillations
+ *   in the capacative sense circuit (possibly using a TIMER).
+ *
+ * @note
+ *   A basic example of capacative sensing can be found in the STK BSP
+ *   (capsense demo).
+ *
+ * @param[in] acmp
+ *   Pointer to ACMP peripheral register block.
+ *
+ * @param[in] init
+ *   Pointer to initialization structure used to configure ACMP for capacative
+ *   sensing operation.
+ ******************************************************************************/
+void ACMP_CapsenseInit(ACMP_TypeDef *acmp, const ACMP_CapsenseInit_TypeDef *init)
+{
+  /* Make sure the module exists on the selected chip */
+  EFM_ASSERT(ACMP_REF_VALID(acmp));
+
+  /* Make sure that vddLevel is within bounds */
+  EFM_ASSERT(init->vddLevel < 64);
+
+  /* Make sure biasprog is within bounds */
+  EFM_ASSERT(init->biasProg < 16);
+
+  /* Set control register. No need to set interrupt modes */
+  acmp->CTRL = (init->fullBias << _ACMP_CTRL_FULLBIAS_SHIFT)
+               | (init->halfBias << _ACMP_CTRL_HALFBIAS_SHIFT)
+               | (init->biasProg << _ACMP_CTRL_BIASPROG_SHIFT)
+               | (init->warmTime << _ACMP_CTRL_WARMTIME_SHIFT)
+               | (init->hysteresisLevel << _ACMP_CTRL_HYSTSEL_SHIFT);
+
+  /* Select capacative sensing mode by selecting a resistor and enabling it */
+  acmp->INPUTSEL = (init->resistor << _ACMP_INPUTSEL_CSRESSEL_SHIFT)
+                   | ACMP_INPUTSEL_CSRESEN
+                   | (init->lowPowerReferenceEnabled << _ACMP_INPUTSEL_LPREF_SHIFT)
+                   | (init->vddLevel << _ACMP_INPUTSEL_VDDLEVEL_SHIFT)
+                   | ACMP_INPUTSEL_NEGSEL_CAPSENSE;
+
+  /* Enable ACMP if requested.
+   * Note: BITBAND_Peripheral() function is used for setting/clearing single
+   * bit peripheral register bitfields. */
+  BITBAND_Peripheral(&(acmp->CTRL),
+                     (uint32_t)_ACMP_CTRL_EN_SHIFT,
+                     (uint32_t)init->enable);
+}
+
+/***************************************************************************//**
+ * @brief
+ *   Sets the ACMP channel used for capacative sensing.
+ *
+ * @note
+ *   A basic example of capacative sensing can be found in the STK BSP
+ *   (capsense demo).
+ *
+ * @param[in] acmp
+ *   Pointer to ACMP peripheral register block.
+ *
+ * @param[in] channel
+ *   The ACMP channel to use for capacative sensing (Possel).
+ ******************************************************************************/
+void ACMP_CapsenseChannelSet(ACMP_TypeDef *acmp, ACMP_Channel_TypeDef channel)
+{
+  /* Make sure that only external channels are used */
+  EFM_ASSERT(channel <= _ACMP_INPUTSEL_POSSEL_CH7);
+
+  /* Set channel as positive channel in ACMP */
+  SET_BIT_FIELD(acmp->INPUTSEL, _ACMP_INPUTSEL_POSSEL_MASK, channel,
+                _ACMP_INPUTSEL_POSSEL_SHIFT);
+}
+
+/***************************************************************************//**
+ * @brief
+ *   Disables the ACMP.
+ *
+ * @param[in] acmp
+ *   Pointer to ACMP peripheral register block.
+ ******************************************************************************/
+void ACMP_Disable(ACMP_TypeDef *acmp)
+{
+  acmp->CTRL &= ~ACMP_CTRL_EN;
+}
+
+/***************************************************************************//**
+ * @brief
+ *   Enables the ACMP.
+ *
+ * @param[in] acmp
+ *   Pointer to ACMP peripheral register block.
+ ******************************************************************************/
+void ACMP_Enable(ACMP_TypeDef *acmp)
+{
+  acmp->CTRL |= ACMP_CTRL_EN;
+}
+
+/***************************************************************************//**
+ * @brief
+ *   Reset ACMP to same state as after a HW reset.
+ *
+ * @note
+ *   The ROUTE register is NOT reset by this function, in order to allow for
+ *   centralized setup of this feature.
+ *
+ * @param[in] acmp
+ *   Pointer to the ACMP peripheral register block.
+ ******************************************************************************/
+void ACMP_Reset(ACMP_TypeDef *acmp)
+{
+  /* Make sure the module exists on the selected chip */
+  EFM_ASSERT(ACMP_REF_VALID(acmp));
+
+  acmp->CTRL     = _ACMP_CTRL_RESETVALUE;
+  acmp->INPUTSEL = _ACMP_INPUTSEL_RESETVALUE;
+  acmp->IEN      = _ACMP_IEN_RESETVALUE;
+  acmp->IFC      = _ACMP_IF_MASK;
+}
+
+/***************************************************************************//**
+ * @brief
+ *   Sets up GPIO output from the ACMP.
+ *
+ * @note
+ *    GPIO must be enabled in the CMU before this function call, i.e.
+ * @verbatim CMU_ClockEnable(cmuClock_GPIO, true); @endverbatim
+ *
+ * @param[in] acmp
+ *   Pointer to the ACMP peripheral register block.
+ *
+ * @param location
+ *   The pin location to use. See the datasheet for location to pin mappings.
+ *
+ * @param enable
+ *   Enable or disable pin output.
+ *
+ * @param invert
+ *   Invert output.
+ ******************************************************************************/
+void ACMP_GPIOSetup(ACMP_TypeDef *acmp, uint32_t location, bool enable, bool invert)
+{
+  /* Sanity checking of location */
+#if defined( _ACMP_ROUTE_LOCATION_LOC3 )
+  EFM_ASSERT(location <= _ACMP_ROUTE_LOCATION_LOC3);
+
+#elif defined( _ACMP_ROUTE_LOCATION_LOC2 )
+  EFM_ASSERT(location <= _ACMP_ROUTE_LOCATION_LOC2);
+
+#elif defined( _ACMP_ROUTE_LOCATION_LOC1 )
+  EFM_ASSERT(location <= _ACMP_ROUTE_LOCATION_LOC1);
+
+#else
+#error Illegal pin location (ACMP).
+#endif
+
+
+  /* Set GPIO inversion */
+  SET_BIT_FIELD(acmp->CTRL, _ACMP_CTRL_GPIOINV_MASK, invert,
+                _ACMP_CTRL_GPIOINV_SHIFT);
+
+  acmp->ROUTE = (location << _ACMP_ROUTE_LOCATION_SHIFT)
+                | (enable << _ACMP_ROUTE_ACMPPEN_SHIFT);
+}
+
+/***************************************************************************//**
+ * @brief
+ *   Sets which channels should be used in ACMP comparisons.
+ *
+ * @param[in] acmp
+ *   Pointer to the ACMP peripheral register block.
+ *
+ * @param negSel
+ *   Channel to use on the negative input to the ACMP.
+ *
+ * @param posSel
+ *   Channel to use on the positive input to the ACMP.
+ ******************************************************************************/
+void ACMP_ChannelSet(ACMP_TypeDef *acmp, ACMP_Channel_TypeDef negSel,
+                     ACMP_Channel_TypeDef posSel)
+{
+  /* Sanity checking of ACMP inputs */
+  EFM_ASSERT(posSel <= _ACMP_INPUTSEL_POSSEL_CH7);
+
+#if defined(_ACMP_INPUTSEL_NEGSEL_DAC0CH1)
+  EFM_ASSERT(negSel <= _ACMP_INPUTSEL_NEGSEL_DAC0CH1);
+#elif defined(_ACMP_INPUTSEL_NEGSEL_CAPSENSE)
+  EFM_ASSERT(negSel <= _ACMP_INPUTSEL_NEGSEL_CAPSENSE);
+#else
+#error Illegal negative input selection (ACMP).
+#endif
+
+  acmp->INPUTSEL = (acmp->INPUTSEL & ~(_ACMP_INPUTSEL_POSSEL_MASK |
+                                       _ACMP_INPUTSEL_NEGSEL_MASK))
+                   | (negSel << _ACMP_INPUTSEL_NEGSEL_SHIFT)
+                   | (posSel << _ACMP_INPUTSEL_POSSEL_SHIFT);
+}
+
+/***************************************************************************//**
+ * @brief
+ *
+ *
+ * @param[in] acmp
+ *   Pointer to the ACMP peripheral register block.
+ *
+ * @param[in] init
+ *   Pointer to initialization structure used to configure ACMP for capacative
+ *   sensing operation.
+ ******************************************************************************/
+void ACMP_Init(ACMP_TypeDef *acmp, const ACMP_Init_TypeDef *init)
+{
+  /* Make sure the module exists on the selected chip */
+  EFM_ASSERT(ACMP_REF_VALID(acmp));
+
+  /* Make sure biasprog is within bounds */
+  EFM_ASSERT(init->biasProg < 16);
+
+  /* Set control register. No need to set interrupt modes */
+  acmp->CTRL = (init->fullBias << _ACMP_CTRL_FULLBIAS_SHIFT)
+               | (init->halfBias << _ACMP_CTRL_HALFBIAS_SHIFT)
+               | (init->biasProg << _ACMP_CTRL_BIASPROG_SHIFT)
+               | (init->interruptOnFallingEdge << _ACMP_CTRL_IFALL_SHIFT)
+               | (init->interruptOnRisingEdge << _ACMP_CTRL_IRISE_SHIFT)
+               | (init->warmTime << _ACMP_CTRL_WARMTIME_SHIFT)
+               | (init->hysteresisLevel << _ACMP_CTRL_HYSTSEL_SHIFT)
+               | (init->inactiveValue << _ACMP_CTRL_INACTVAL_SHIFT);
+
+  acmp->INPUTSEL = (init->lowPowerReferenceEnabled << _ACMP_INPUTSEL_LPREF_SHIFT)
+                   | (init->vddLevel << _ACMP_INPUTSEL_VDDLEVEL_SHIFT);
+
+  /* Enable ACMP if requested.
+   * Note: BITBAND_Peripheral() function is used for setting/clearing single
+   * bit peripheral register bitfields. */
+  BITBAND_Peripheral(&(acmp->CTRL),
+                     (uint32_t)_ACMP_CTRL_EN_SHIFT,
+                     (uint32_t)init->enable);
+}
+
+
+/** @} (end addtogroup ACMP) */
+/** @} (end addtogroup EM_Library) */
+#endif /* defined(ACMP_COUNT) && (ACMP_COUNT > 0) */