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@147:ba84b7dc41a7, 2016-09-10 (annotated)

Committer:
JojoS
Date:
Sat Sep 10 15:32:04 2016 +0000
Revision:
147:ba84b7dc41a7
Parent:
144:ef7eb2e8f9f7 
added prescaler for 16 bit timers (solution as in LPC11xx), default prescaler 31 for max 28 ms period time

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /***************************************************************************//**
<> 144:ef7eb2e8f9f7 2 * @file em_prs.c
<> 144:ef7eb2e8f9f7 3 * @brief Peripheral Reflex System (PRS) Peripheral API
<> 144:ef7eb2e8f9f7 4 * @version 4.2.1
<> 144:ef7eb2e8f9f7 5 *******************************************************************************
<> 144:ef7eb2e8f9f7 6 * @section License
<> 144:ef7eb2e8f9f7 7 * <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b>
<> 144:ef7eb2e8f9f7 8 *******************************************************************************
<> 144:ef7eb2e8f9f7 9 *
<> 144:ef7eb2e8f9f7 10 * Permission is granted to anyone to use this software for any purpose,
<> 144:ef7eb2e8f9f7 11 * including commercial applications, and to alter it and redistribute it
<> 144:ef7eb2e8f9f7 12 * freely, subject to the following restrictions:
<> 144:ef7eb2e8f9f7 13 *
<> 144:ef7eb2e8f9f7 14 * 1. The origin of this software must not be misrepresented; you must not
<> 144:ef7eb2e8f9f7 15 * claim that you wrote the original software.
<> 144:ef7eb2e8f9f7 16 * 2. Altered source versions must be plainly marked as such, and must not be
<> 144:ef7eb2e8f9f7 17 * misrepresented as being the original software.
<> 144:ef7eb2e8f9f7 18 * 3. This notice may not be removed or altered from any source distribution.
<> 144:ef7eb2e8f9f7 19 *
<> 144:ef7eb2e8f9f7 20 * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Silicon Labs has no
<> 144:ef7eb2e8f9f7 21 * obligation to support this Software. Silicon Labs is providing the
<> 144:ef7eb2e8f9f7 22 * Software "AS IS", with no express or implied warranties of any kind,
<> 144:ef7eb2e8f9f7 23 * including, but not limited to, any implied warranties of merchantability
<> 144:ef7eb2e8f9f7 24 * or fitness for any particular purpose or warranties against infringement
<> 144:ef7eb2e8f9f7 25 * of any proprietary rights of a third party.
<> 144:ef7eb2e8f9f7 26 *
<> 144:ef7eb2e8f9f7 27 * Silicon Labs will not be liable for any consequential, incidental, or
<> 144:ef7eb2e8f9f7 28 * special damages, or any other relief, or for any claim by any third party,
<> 144:ef7eb2e8f9f7 29 * arising from your use of this Software.
<> 144:ef7eb2e8f9f7 30 *
<> 144:ef7eb2e8f9f7 31 ******************************************************************************/
<> 144:ef7eb2e8f9f7 32
<> 144:ef7eb2e8f9f7 33 #include "em_prs.h"
<> 144:ef7eb2e8f9f7 34 #if defined(PRS_COUNT) && (PRS_COUNT > 0)
<> 144:ef7eb2e8f9f7 35
<> 144:ef7eb2e8f9f7 36 #include "em_assert.h"
<> 144:ef7eb2e8f9f7 37
<> 144:ef7eb2e8f9f7 38 /***************************************************************************//**
<> 144:ef7eb2e8f9f7 39 * @addtogroup EM_Library
<> 144:ef7eb2e8f9f7 40 * @{
<> 144:ef7eb2e8f9f7 41 ******************************************************************************/
<> 144:ef7eb2e8f9f7 42
<> 144:ef7eb2e8f9f7 43 /***************************************************************************//**
<> 144:ef7eb2e8f9f7 44 * @addtogroup PRS
<> 144:ef7eb2e8f9f7 45 * @brief Peripheral Reflex System (PRS) Peripheral API
<> 144:ef7eb2e8f9f7 46 * @{
<> 144:ef7eb2e8f9f7 47 ******************************************************************************/
<> 144:ef7eb2e8f9f7 48
<> 144:ef7eb2e8f9f7 49 /*******************************************************************************
<> 144:ef7eb2e8f9f7 50 ************************** GLOBAL FUNCTIONS *******************************
<> 144:ef7eb2e8f9f7 51 ******************************************************************************/
<> 144:ef7eb2e8f9f7 52
<> 144:ef7eb2e8f9f7 53 /***************************************************************************//**
<> 144:ef7eb2e8f9f7 54 * @brief
<> 144:ef7eb2e8f9f7 55 * Set source and signal to be used for a channel.
<> 144:ef7eb2e8f9f7 56 *
<> 144:ef7eb2e8f9f7 57 * @param[in] ch
<> 144:ef7eb2e8f9f7 58 * Channel to define signal and source for.
<> 144:ef7eb2e8f9f7 59 *
<> 144:ef7eb2e8f9f7 60 * @param[in] source
<> 144:ef7eb2e8f9f7 61 * Source to select for channel. Use one of PRS_CH_CTRL_SOURCESEL_x defines.
<> 144:ef7eb2e8f9f7 62 *
<> 144:ef7eb2e8f9f7 63 * @param[in] signal
<> 144:ef7eb2e8f9f7 64 * Signal (for selected @p source) to use. Use one of PRS_CH_CTRL_SIGSEL_x
<> 144:ef7eb2e8f9f7 65 * defines.
<> 144:ef7eb2e8f9f7 66 *
<> 144:ef7eb2e8f9f7 67 * @param[in] edge
<> 144:ef7eb2e8f9f7 68 * Edge (for selected source/signal) to generate pulse for.
<> 144:ef7eb2e8f9f7 69 ******************************************************************************/
<> 144:ef7eb2e8f9f7 70 void PRS_SourceSignalSet(unsigned int ch,
<> 144:ef7eb2e8f9f7 71 uint32_t source,
<> 144:ef7eb2e8f9f7 72 uint32_t signal,
<> 144:ef7eb2e8f9f7 73 PRS_Edge_TypeDef edge)
<> 144:ef7eb2e8f9f7 74 {
<> 144:ef7eb2e8f9f7 75 EFM_ASSERT(ch < PRS_CHAN_COUNT);
<> 144:ef7eb2e8f9f7 76
<> 144:ef7eb2e8f9f7 77 PRS->CH[ch].CTRL = (source & _PRS_CH_CTRL_SOURCESEL_MASK)
<> 144:ef7eb2e8f9f7 78 | (signal & _PRS_CH_CTRL_SIGSEL_MASK)
<> 144:ef7eb2e8f9f7 79 | (uint32_t)edge;
<> 144:ef7eb2e8f9f7 80 }
<> 144:ef7eb2e8f9f7 81
<> 144:ef7eb2e8f9f7 82 #if defined( PRS_CH_CTRL_ASYNC )
<> 144:ef7eb2e8f9f7 83 /***************************************************************************//**
<> 144:ef7eb2e8f9f7 84 * @brief
<> 144:ef7eb2e8f9f7 85 * Set source and asynchronous signal to be used for a channel.
<> 144:ef7eb2e8f9f7 86 *
<> 144:ef7eb2e8f9f7 87 * @details
<> 144:ef7eb2e8f9f7 88 * Asynchronous reflexes are not clocked on HFPERCLK, and can be used even in
<> 144:ef7eb2e8f9f7 89 * EM2/EM3.
<> 144:ef7eb2e8f9f7 90 * There is a limitation to reflexes operating in asynchronous mode: they can
<> 144:ef7eb2e8f9f7 91 * only be used by a subset of the reflex consumers. Please refer to PRS
<> 144:ef7eb2e8f9f7 92 * chapter in the reference manual for the complete list of supported
<> 144:ef7eb2e8f9f7 93 * asynchronous signals and consumers.
<> 144:ef7eb2e8f9f7 94 *
<> 144:ef7eb2e8f9f7 95 * @note
<> 144:ef7eb2e8f9f7 96 * This function is not supported on EFM32GxxxFyyy parts.
<> 144:ef7eb2e8f9f7 97 * In asynchronous mode, the edge detector only works in EM0, hence it shall
<> 144:ef7eb2e8f9f7 98 * not be used. The EDSEL parameter in PRS_CHx_CTRL register is set to 0 (OFF)
<> 144:ef7eb2e8f9f7 99 * by default.
<> 144:ef7eb2e8f9f7 100 *
<> 144:ef7eb2e8f9f7 101 * @param[in] ch
<> 144:ef7eb2e8f9f7 102 * Channel to define source and asynchronous signal for.
<> 144:ef7eb2e8f9f7 103 *
<> 144:ef7eb2e8f9f7 104 * @param[in] source
<> 144:ef7eb2e8f9f7 105 * Source to select for channel. Use one of PRS_CH_CTRL_SOURCESEL_x defines.
<> 144:ef7eb2e8f9f7 106 *
<> 144:ef7eb2e8f9f7 107 * @param[in] signal
<> 144:ef7eb2e8f9f7 108 * Asynchronous signal (for selected @p source) to use. Use one of the
<> 144:ef7eb2e8f9f7 109 * PRS_CH_CTRL_SIGSEL_x defines that support asynchronous operation.
<> 144:ef7eb2e8f9f7 110 ******************************************************************************/
<> 144:ef7eb2e8f9f7 111 void PRS_SourceAsyncSignalSet(unsigned int ch,
<> 144:ef7eb2e8f9f7 112 uint32_t source,
<> 144:ef7eb2e8f9f7 113 uint32_t signal)
<> 144:ef7eb2e8f9f7 114 {
<> 144:ef7eb2e8f9f7 115 EFM_ASSERT(ch < PRS_CHAN_COUNT);
<> 144:ef7eb2e8f9f7 116
<> 144:ef7eb2e8f9f7 117 PRS->CH[ch].CTRL = PRS_CH_CTRL_ASYNC
<> 144:ef7eb2e8f9f7 118 | (source & _PRS_CH_CTRL_SOURCESEL_MASK)
<> 144:ef7eb2e8f9f7 119 | (signal & _PRS_CH_CTRL_SIGSEL_MASK)
<> 144:ef7eb2e8f9f7 120 | PRS_CH_CTRL_EDSEL_OFF;
<> 144:ef7eb2e8f9f7 121 }
<> 144:ef7eb2e8f9f7 122 #endif
<> 144:ef7eb2e8f9f7 123
<> 144:ef7eb2e8f9f7 124 /** @} (end addtogroup PRS) */
<> 144:ef7eb2e8f9f7 125 /** @} (end addtogroup EM_Library) */
<> 144:ef7eb2e8f9f7 126 #endif /* defined(PRS_COUNT) && (PRS_COUNT > 0) */