Johannes Stratmann / mbed-dev

added prescaler for 16 bit pwm in LPC1347 target

Fork of mbed-dev by mbed official

targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/emlib/src/em_vcmp.c@0:9b334a45a8ff, 2015-10-01 (annotated)

Committer:
bogdanm
Date:
Thu Oct 01 15:25:22 2015 +0300
Revision:
0:9b334a45a8ff
Child:
50:a417edff4437
Initial commit on mbed-dev



Replaces mbed-src (now inactive)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 0:9b334a45a8ff 1 /***************************************************************************//**
bogdanm 0:9b334a45a8ff 2 * @file em_vcmp.c
bogdanm 0:9b334a45a8ff 3 * @brief Voltage Comparator (VCMP) peripheral API
bogdanm 0:9b334a45a8ff 4 * @version 3.20.12
bogdanm 0:9b334a45a8ff 5 *******************************************************************************
bogdanm 0:9b334a45a8ff 6 * @section License
bogdanm 0:9b334a45a8ff 7 * <b>(C) Copyright 2014 Silicon Labs, http://www.silabs.com</b>
bogdanm 0:9b334a45a8ff 8 *******************************************************************************
bogdanm 0:9b334a45a8ff 9 *
bogdanm 0:9b334a45a8ff 10 * Permission is granted to anyone to use this software for any purpose,
bogdanm 0:9b334a45a8ff 11 * including commercial applications, and to alter it and redistribute it
bogdanm 0:9b334a45a8ff 12 * freely, subject to the following restrictions:
bogdanm 0:9b334a45a8ff 13 *
bogdanm 0:9b334a45a8ff 14 * 1. The origin of this software must not be misrepresented; you must not
bogdanm 0:9b334a45a8ff 15 * claim that you wrote the original software.
bogdanm 0:9b334a45a8ff 16 * 2. Altered source versions must be plainly marked as such, and must not be
bogdanm 0:9b334a45a8ff 17 * misrepresented as being the original software.
bogdanm 0:9b334a45a8ff 18 * 3. This notice may not be removed or altered from any source distribution.
bogdanm 0:9b334a45a8ff 19 *
bogdanm 0:9b334a45a8ff 20 * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Silicon Labs has no
bogdanm 0:9b334a45a8ff 21 * obligation to support this Software. Silicon Labs is providing the
bogdanm 0:9b334a45a8ff 22 * Software "AS IS", with no express or implied warranties of any kind,
bogdanm 0:9b334a45a8ff 23 * including, but not limited to, any implied warranties of merchantability
bogdanm 0:9b334a45a8ff 24 * or fitness for any particular purpose or warranties against infringement
bogdanm 0:9b334a45a8ff 25 * of any proprietary rights of a third party.
bogdanm 0:9b334a45a8ff 26 *
bogdanm 0:9b334a45a8ff 27 * Silicon Labs will not be liable for any consequential, incidental, or
bogdanm 0:9b334a45a8ff 28 * special damages, or any other relief, or for any claim by any third party,
bogdanm 0:9b334a45a8ff 29 * arising from your use of this Software.
bogdanm 0:9b334a45a8ff 30 *
bogdanm 0:9b334a45a8ff 31 ******************************************************************************/
bogdanm 0:9b334a45a8ff 32
bogdanm 0:9b334a45a8ff 33
bogdanm 0:9b334a45a8ff 34 #include "em_vcmp.h"
bogdanm 0:9b334a45a8ff 35 #if defined(VCMP_COUNT) && (VCMP_COUNT > 0)
bogdanm 0:9b334a45a8ff 36
bogdanm 0:9b334a45a8ff 37 #include "em_assert.h"
bogdanm 0:9b334a45a8ff 38
bogdanm 0:9b334a45a8ff 39 /***************************************************************************//**
bogdanm 0:9b334a45a8ff 40 * @addtogroup EM_Library
bogdanm 0:9b334a45a8ff 41 * @{
bogdanm 0:9b334a45a8ff 42 ******************************************************************************/
bogdanm 0:9b334a45a8ff 43
bogdanm 0:9b334a45a8ff 44 /***************************************************************************//**
bogdanm 0:9b334a45a8ff 45 * @addtogroup VCMP
bogdanm 0:9b334a45a8ff 46 * @brief Voltage Comparator (VCMP) Peripheral API
bogdanm 0:9b334a45a8ff 47 * @{
bogdanm 0:9b334a45a8ff 48 ******************************************************************************/
bogdanm 0:9b334a45a8ff 49
bogdanm 0:9b334a45a8ff 50 /***************************************************************************//**
bogdanm 0:9b334a45a8ff 51 * @brief
bogdanm 0:9b334a45a8ff 52 * Configure and enable Voltage Comparator
bogdanm 0:9b334a45a8ff 53 *
bogdanm 0:9b334a45a8ff 54 * @param[in] vcmpInit
bogdanm 0:9b334a45a8ff 55 * VCMP Initialization structure
bogdanm 0:9b334a45a8ff 56 ******************************************************************************/
bogdanm 0:9b334a45a8ff 57 void VCMP_Init(const VCMP_Init_TypeDef *vcmpInit)
bogdanm 0:9b334a45a8ff 58 {
bogdanm 0:9b334a45a8ff 59 /* Verify input */
bogdanm 0:9b334a45a8ff 60 EFM_ASSERT((vcmpInit->inactive == 0) || (vcmpInit->inactive == 1));
bogdanm 0:9b334a45a8ff 61 EFM_ASSERT((vcmpInit->biasProg >= 0) && (vcmpInit->biasProg < 16));
bogdanm 0:9b334a45a8ff 62
bogdanm 0:9b334a45a8ff 63 /* Configure Half Bias setting */
bogdanm 0:9b334a45a8ff 64 if (vcmpInit->halfBias)
bogdanm 0:9b334a45a8ff 65 {
bogdanm 0:9b334a45a8ff 66 VCMP->CTRL |= VCMP_CTRL_HALFBIAS;
bogdanm 0:9b334a45a8ff 67 }
bogdanm 0:9b334a45a8ff 68 else
bogdanm 0:9b334a45a8ff 69 {
bogdanm 0:9b334a45a8ff 70 VCMP->CTRL &= ~(VCMP_CTRL_HALFBIAS);
bogdanm 0:9b334a45a8ff 71 }
bogdanm 0:9b334a45a8ff 72
bogdanm 0:9b334a45a8ff 73 /* Configure bias prog */
bogdanm 0:9b334a45a8ff 74 VCMP->CTRL &= ~(_VCMP_CTRL_BIASPROG_MASK);
bogdanm 0:9b334a45a8ff 75 VCMP->CTRL |= (vcmpInit->biasProg << _VCMP_CTRL_BIASPROG_SHIFT);
bogdanm 0:9b334a45a8ff 76
bogdanm 0:9b334a45a8ff 77 /* Configure sense for falling edge */
bogdanm 0:9b334a45a8ff 78 if (vcmpInit->irqFalling)
bogdanm 0:9b334a45a8ff 79 {
bogdanm 0:9b334a45a8ff 80 VCMP->CTRL |= VCMP_CTRL_IFALL;
bogdanm 0:9b334a45a8ff 81 }
bogdanm 0:9b334a45a8ff 82 else
bogdanm 0:9b334a45a8ff 83 {
bogdanm 0:9b334a45a8ff 84 VCMP->CTRL &= ~(VCMP_CTRL_IFALL);
bogdanm 0:9b334a45a8ff 85 }
bogdanm 0:9b334a45a8ff 86
bogdanm 0:9b334a45a8ff 87 /* Configure sense for rising edge */
bogdanm 0:9b334a45a8ff 88 if (vcmpInit->irqRising)
bogdanm 0:9b334a45a8ff 89 {
bogdanm 0:9b334a45a8ff 90 VCMP->CTRL |= VCMP_CTRL_IRISE;
bogdanm 0:9b334a45a8ff 91 }
bogdanm 0:9b334a45a8ff 92 else
bogdanm 0:9b334a45a8ff 93 {
bogdanm 0:9b334a45a8ff 94 VCMP->CTRL &= ~(VCMP_CTRL_IRISE);
bogdanm 0:9b334a45a8ff 95 }
bogdanm 0:9b334a45a8ff 96
bogdanm 0:9b334a45a8ff 97 /* Configure warm-up time */
bogdanm 0:9b334a45a8ff 98 VCMP->CTRL &= ~(_VCMP_CTRL_WARMTIME_MASK);
bogdanm 0:9b334a45a8ff 99 VCMP->CTRL |= (vcmpInit->warmup << _VCMP_CTRL_WARMTIME_SHIFT);
bogdanm 0:9b334a45a8ff 100
bogdanm 0:9b334a45a8ff 101 /* Configure hysteresis */
bogdanm 0:9b334a45a8ff 102 switch (vcmpInit->hyst)
bogdanm 0:9b334a45a8ff 103 {
bogdanm 0:9b334a45a8ff 104 case vcmpHyst20mV:
bogdanm 0:9b334a45a8ff 105 VCMP->CTRL |= VCMP_CTRL_HYSTEN;
bogdanm 0:9b334a45a8ff 106 break;
bogdanm 0:9b334a45a8ff 107 case vcmpHystNone:
bogdanm 0:9b334a45a8ff 108 VCMP->CTRL &= ~(VCMP_CTRL_HYSTEN);
bogdanm 0:9b334a45a8ff 109 break;
bogdanm 0:9b334a45a8ff 110 default:
bogdanm 0:9b334a45a8ff 111 break;
bogdanm 0:9b334a45a8ff 112 }
bogdanm 0:9b334a45a8ff 113
bogdanm 0:9b334a45a8ff 114 /* Configure inactive output value */
bogdanm 0:9b334a45a8ff 115 VCMP->CTRL |= (vcmpInit->inactive << _VCMP_CTRL_INACTVAL_SHIFT);
bogdanm 0:9b334a45a8ff 116
bogdanm 0:9b334a45a8ff 117 /* Configure trigger level */
bogdanm 0:9b334a45a8ff 118 VCMP_TriggerSet(vcmpInit->triggerLevel);
bogdanm 0:9b334a45a8ff 119
bogdanm 0:9b334a45a8ff 120 /* Enable or disable VCMP */
bogdanm 0:9b334a45a8ff 121 if (vcmpInit->enable)
bogdanm 0:9b334a45a8ff 122 {
bogdanm 0:9b334a45a8ff 123 VCMP->CTRL |= VCMP_CTRL_EN;
bogdanm 0:9b334a45a8ff 124 }
bogdanm 0:9b334a45a8ff 125 else
bogdanm 0:9b334a45a8ff 126 {
bogdanm 0:9b334a45a8ff 127 VCMP->CTRL &= ~(VCMP_CTRL_EN);
bogdanm 0:9b334a45a8ff 128 }
bogdanm 0:9b334a45a8ff 129
bogdanm 0:9b334a45a8ff 130 /* If Low Power Reference is enabled, wait until VCMP is ready */
bogdanm 0:9b334a45a8ff 131 /* before enabling it, see reference manual for deatils */
bogdanm 0:9b334a45a8ff 132 /* Configuring Low Power Ref without enable has no effect */
bogdanm 0:9b334a45a8ff 133 if(vcmpInit->lowPowerRef && vcmpInit->enable)
bogdanm 0:9b334a45a8ff 134 {
bogdanm 0:9b334a45a8ff 135 /* Poll for VCMP ready */
bogdanm 0:9b334a45a8ff 136 while(!VCMP_Ready());
bogdanm 0:9b334a45a8ff 137 VCMP_LowPowerRefSet(vcmpInit->lowPowerRef);
bogdanm 0:9b334a45a8ff 138 }
bogdanm 0:9b334a45a8ff 139
bogdanm 0:9b334a45a8ff 140 /* Clear edge interrupt */
bogdanm 0:9b334a45a8ff 141 VCMP_IntClear(VCMP_IF_EDGE);
bogdanm 0:9b334a45a8ff 142 }
bogdanm 0:9b334a45a8ff 143
bogdanm 0:9b334a45a8ff 144
bogdanm 0:9b334a45a8ff 145 /***************************************************************************//**
bogdanm 0:9b334a45a8ff 146 * @brief
bogdanm 0:9b334a45a8ff 147 * Enable or disable Low Power Reference setting
bogdanm 0:9b334a45a8ff 148 *
bogdanm 0:9b334a45a8ff 149 * @param[in] enable
bogdanm 0:9b334a45a8ff 150 * If true, enables low power reference, if false disable low power reference
bogdanm 0:9b334a45a8ff 151 ******************************************************************************/
bogdanm 0:9b334a45a8ff 152 void VCMP_LowPowerRefSet(bool enable)
bogdanm 0:9b334a45a8ff 153 {
bogdanm 0:9b334a45a8ff 154 if (enable)
bogdanm 0:9b334a45a8ff 155 {
bogdanm 0:9b334a45a8ff 156 VCMP->INPUTSEL |= VCMP_INPUTSEL_LPREF;
bogdanm 0:9b334a45a8ff 157 }
bogdanm 0:9b334a45a8ff 158 else
bogdanm 0:9b334a45a8ff 159 {
bogdanm 0:9b334a45a8ff 160 VCMP->INPUTSEL &= ~(VCMP_INPUTSEL_LPREF);
bogdanm 0:9b334a45a8ff 161 }
bogdanm 0:9b334a45a8ff 162 }
bogdanm 0:9b334a45a8ff 163
bogdanm 0:9b334a45a8ff 164
bogdanm 0:9b334a45a8ff 165 /***************************************************************************//**
bogdanm 0:9b334a45a8ff 166 * @brief
bogdanm 0:9b334a45a8ff 167 * Configure trigger level of voltage comparator
bogdanm 0:9b334a45a8ff 168 *
bogdanm 0:9b334a45a8ff 169 * @param[in] level
bogdanm 0:9b334a45a8ff 170 * Trigger value, in range 0-63
bogdanm 0:9b334a45a8ff 171 ******************************************************************************/
bogdanm 0:9b334a45a8ff 172 void VCMP_TriggerSet(int level)
bogdanm 0:9b334a45a8ff 173 {
bogdanm 0:9b334a45a8ff 174 /* Trigger range is 6 bits, value from 0-63 */
bogdanm 0:9b334a45a8ff 175 EFM_ASSERT((level > 0) && (level < 64));
bogdanm 0:9b334a45a8ff 176
bogdanm 0:9b334a45a8ff 177 /* Set trigger level */
bogdanm 0:9b334a45a8ff 178 VCMP->INPUTSEL = (VCMP->INPUTSEL & ~(_VCMP_INPUTSEL_TRIGLEVEL_MASK)) |
bogdanm 0:9b334a45a8ff 179 (level << _VCMP_INPUTSEL_TRIGLEVEL_SHIFT);
bogdanm 0:9b334a45a8ff 180 }
bogdanm 0:9b334a45a8ff 181
bogdanm 0:9b334a45a8ff 182
bogdanm 0:9b334a45a8ff 183 /** @} (end addtogroup VCMP) */
bogdanm 0:9b334a45a8ff 184 /** @} (end addtogroup EM_Library) */
bogdanm 0:9b334a45a8ff 185 #endif /* defined(VCMP_COUNT) && (VCMP_COUNT > 0) */