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_prs.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_prs.c
bogdanm 0:9b334a45a8ff 3 * @brief Peripheral Reflex System (PRS) 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_prs.h"
bogdanm 0:9b334a45a8ff 35 #if defined(PRS_COUNT) && (PRS_COUNT > 0)
bogdanm 0:9b334a45a8ff 36
bogdanm 0:9b334a45a8ff 37 #include "em_assert.h"
bogdanm 0:9b334a45a8ff 38 #include "em_bitband.h"
bogdanm 0:9b334a45a8ff 39
bogdanm 0:9b334a45a8ff 40 /***************************************************************************//**
bogdanm 0:9b334a45a8ff 41 * @addtogroup EM_Library
bogdanm 0:9b334a45a8ff 42 * @{
bogdanm 0:9b334a45a8ff 43 ******************************************************************************/
bogdanm 0:9b334a45a8ff 44
bogdanm 0:9b334a45a8ff 45 /***************************************************************************//**
bogdanm 0:9b334a45a8ff 46 * @addtogroup PRS
bogdanm 0:9b334a45a8ff 47 * @brief Peripheral Reflex System (PRS) Peripheral API
bogdanm 0:9b334a45a8ff 48 * @{
bogdanm 0:9b334a45a8ff 49 ******************************************************************************/
bogdanm 0:9b334a45a8ff 50
bogdanm 0:9b334a45a8ff 51 /*******************************************************************************
bogdanm 0:9b334a45a8ff 52 ************************** GLOBAL FUNCTIONS *******************************
bogdanm 0:9b334a45a8ff 53 ******************************************************************************/
bogdanm 0:9b334a45a8ff 54
bogdanm 0:9b334a45a8ff 55 /***************************************************************************//**
bogdanm 0:9b334a45a8ff 56 * @brief
bogdanm 0:9b334a45a8ff 57 * Set source and signal to be used for a channel.
bogdanm 0:9b334a45a8ff 58 *
bogdanm 0:9b334a45a8ff 59 * @param[in] ch
bogdanm 0:9b334a45a8ff 60 * Channel to define signal and source for.
bogdanm 0:9b334a45a8ff 61 *
bogdanm 0:9b334a45a8ff 62 * @param[in] source
bogdanm 0:9b334a45a8ff 63 * Source to select for channel. Use one of PRS_CH_CTRL_SOURCESEL_x defines.
bogdanm 0:9b334a45a8ff 64 *
bogdanm 0:9b334a45a8ff 65 * @param[in] signal
bogdanm 0:9b334a45a8ff 66 * Signal (for selected @p source) to use. Use one of PRS_CH_CTRL_SIGSEL_x
bogdanm 0:9b334a45a8ff 67 * defines.
bogdanm 0:9b334a45a8ff 68 *
bogdanm 0:9b334a45a8ff 69 * @param[in] edge
bogdanm 0:9b334a45a8ff 70 * Edge (for selected source/signal) to generate pulse for.
bogdanm 0:9b334a45a8ff 71 ******************************************************************************/
bogdanm 0:9b334a45a8ff 72 void PRS_SourceSignalSet(unsigned int ch,
bogdanm 0:9b334a45a8ff 73 uint32_t source,
bogdanm 0:9b334a45a8ff 74 uint32_t signal,
bogdanm 0:9b334a45a8ff 75 PRS_Edge_TypeDef edge)
bogdanm 0:9b334a45a8ff 76 {
bogdanm 0:9b334a45a8ff 77 EFM_ASSERT(ch < PRS_CHAN_COUNT);
bogdanm 0:9b334a45a8ff 78
bogdanm 0:9b334a45a8ff 79 PRS->CH[ch].CTRL = (source & _PRS_CH_CTRL_SOURCESEL_MASK) |
bogdanm 0:9b334a45a8ff 80 (signal & _PRS_CH_CTRL_SIGSEL_MASK) |
bogdanm 0:9b334a45a8ff 81 (uint32_t)edge;
bogdanm 0:9b334a45a8ff 82 }
bogdanm 0:9b334a45a8ff 83
bogdanm 0:9b334a45a8ff 84 #if defined( PRS_CH_CTRL_ASYNC )
bogdanm 0:9b334a45a8ff 85 /***************************************************************************//**
bogdanm 0:9b334a45a8ff 86 * @brief
bogdanm 0:9b334a45a8ff 87 * Set source and asynchronous signal to be used for a channel.
bogdanm 0:9b334a45a8ff 88 *
bogdanm 0:9b334a45a8ff 89 * @details
bogdanm 0:9b334a45a8ff 90 * Asynchronous reflexes are not clocked on HFPERCLK, and can be used even in
bogdanm 0:9b334a45a8ff 91 * EM2/EM3.
bogdanm 0:9b334a45a8ff 92 * There is a limitation to reflexes operating in asynchronous mode: they can
bogdanm 0:9b334a45a8ff 93 * only be used by a subset of the reflex consumers. Please refer to PRS
bogdanm 0:9b334a45a8ff 94 * chapter in the reference manual for the complete list of supported
bogdanm 0:9b334a45a8ff 95 * asynchronous signals and consumers.
bogdanm 0:9b334a45a8ff 96 *
bogdanm 0:9b334a45a8ff 97 * @note
bogdanm 0:9b334a45a8ff 98 * This function is supported on the following device families:
bogdanm 0:9b334a45a8ff 99 * @li Giant Gecko (EFM32GGxxxFxxx)
bogdanm 0:9b334a45a8ff 100 * @li Leopard Gecko (EFM32LGxxxFxxx)
bogdanm 0:9b334a45a8ff 101 * @li Tiny Gecko (EFM32TGxxxFxxx)
bogdanm 0:9b334a45a8ff 102 * @li Wonder Gecko (EFM32WGxxxFxxx)
bogdanm 0:9b334a45a8ff 103 * @li Zero Gecko (EFM32ZGxxxFxxx)
bogdanm 0:9b334a45a8ff 104 * In asynchronous mode, the edge detector only works in EM0, hence it shall
bogdanm 0:9b334a45a8ff 105 * not be used. The EDSEL parameter in PRS_CHx_CTRL register is set to 0 (OFF)
bogdanm 0:9b334a45a8ff 106 * by default.
bogdanm 0:9b334a45a8ff 107 *
bogdanm 0:9b334a45a8ff 108 * @param[in] ch
bogdanm 0:9b334a45a8ff 109 * Channel to define source and asynchronous signal for.
bogdanm 0:9b334a45a8ff 110 *
bogdanm 0:9b334a45a8ff 111 * @param[in] source
bogdanm 0:9b334a45a8ff 112 * Source to select for channel. Use one of PRS_CH_CTRL_SOURCESEL_x defines.
bogdanm 0:9b334a45a8ff 113 *
bogdanm 0:9b334a45a8ff 114 * @param[in] signal
bogdanm 0:9b334a45a8ff 115 * Asynchronous signal (for selected @p source) to use. Use one of the
bogdanm 0:9b334a45a8ff 116 * PRS_CH_CTRL_SIGSEL_x defines that support asynchronous operation.
bogdanm 0:9b334a45a8ff 117 ******************************************************************************/
bogdanm 0:9b334a45a8ff 118 void PRS_SourceAsyncSignalSet(unsigned int ch,
bogdanm 0:9b334a45a8ff 119 uint32_t source,
bogdanm 0:9b334a45a8ff 120 uint32_t signal)
bogdanm 0:9b334a45a8ff 121 {
bogdanm 0:9b334a45a8ff 122 EFM_ASSERT(ch < PRS_CHAN_COUNT);
bogdanm 0:9b334a45a8ff 123
bogdanm 0:9b334a45a8ff 124 PRS->CH[ch].CTRL = PRS_CH_CTRL_ASYNC |
bogdanm 0:9b334a45a8ff 125 (source & _PRS_CH_CTRL_SOURCESEL_MASK) |
bogdanm 0:9b334a45a8ff 126 (signal & _PRS_CH_CTRL_SIGSEL_MASK) |
bogdanm 0:9b334a45a8ff 127 PRS_CH_CTRL_EDSEL_OFF;
bogdanm 0:9b334a45a8ff 128 }
bogdanm 0:9b334a45a8ff 129 #endif
bogdanm 0:9b334a45a8ff 130
bogdanm 0:9b334a45a8ff 131 /** @} (end addtogroup PRS) */
bogdanm 0:9b334a45a8ff 132 /** @} (end addtogroup EM_Library) */
bogdanm 0:9b334a45a8ff 133 #endif /* defined(PRS_COUNT) && (PRS_COUNT > 0) */