begriffs open source - cmsis-freertos/blob - Demo/Common/drivers/Atmel/at91lib/peripherals/pmc/pmc.c

   1 /* ----------------------------------------------------------------------------
   2  *         ATMEL Microcontroller Software Support
   3  * ----------------------------------------------------------------------------
   4  * Copyright (c) 2008, Atmel Corporation
   5  *
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * - Redistributions of source code must retain the above copyright notice,
  12  * this list of conditions and the disclaimer below.
  13  *
  14  * Atmel's name may not be used to endorse or promote products derived from
  15  * this software without specific prior written permission.
  16  *
  17  * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
  20  * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
  23  * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  24  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  25  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
  26  * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  * ----------------------------------------------------------------------------
  28  */
  29
  30 //------------------------------------------------------------------------------
  31 //         Headers
  32 //------------------------------------------------------------------------------
  33
  34 #include "pmc.h"
  35 #include <board.h>
  36 #include <utility/assert.h>
  37 #include <utility/trace.h>
  38
  39 //------------------------------------------------------------------------------
  40 //         Global functions
  41 //------------------------------------------------------------------------------
  42
  43 #if defined(at91sam7l64) || defined(at91sam7l128)
  44 //------------------------------------------------------------------------------
  45 /// Sets the fast wake-up inputs that can get the device out of Wait mode.
  46 /// \param inputs  Fast wake-up inputs to enable.
  47 //------------------------------------------------------------------------------
  48 void PMC_SetFastWakeUpInputs(unsigned int inputs)
  49 {
  50     SANITY_CHECK((inputs & ~0xFF) == 0);
  51     AT91C_BASE_PMC->PMC_FSMR = inputs;
  52 }
  53
  54 #if !defined(__ICCARM__)
  55 __attribute__ ((section (".ramfunc"))) // GCC
  56 #endif
  57 //------------------------------------------------------------------------------
  58 /// Disables the main oscillator, making the device enter Wait mode.
  59 //------------------------------------------------------------------------------
  60 void PMC_DisableMainOscillatorForWaitMode(void)
  61 {
  62     AT91C_BASE_PMC->PMC_MOR = 0x37 << 16;
  63     while ((AT91C_BASE_PMC->PMC_MOR & AT91C_PMC_MAINSELS) != AT91C_PMC_MAINSELS);
  64 }
  65
  66 #endif
  67
  68 #if defined(at91sam7l)
  69 //------------------------------------------------------------------------------
  70 /// Disables the main oscillator when NOT running on it.
  71 //------------------------------------------------------------------------------
  72 void PMC_DisableMainOscillator(void)
  73 {
  74     AT91C_BASE_PMC->PMC_MOR = 0x37 << 16;
  75     while ((AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MAINSELS) == AT91C_PMC_MAINSELS);
  76 }
  77 #endif
  78
  79 //------------------------------------------------------------------------------
  80 /// Disables the processor clock, making the device enter Idle mode.
  81 //------------------------------------------------------------------------------
  82 void PMC_DisableProcessorClock(void)
  83 {
  84     AT91C_BASE_PMC->PMC_SCDR = AT91C_PMC_PCK;
  85     while ((AT91C_BASE_PMC->PMC_SCSR & AT91C_PMC_PCK) != AT91C_PMC_PCK);
  86 }
  87
  88 //------------------------------------------------------------------------------
  89 /// Enables the clock of a peripheral. The peripheral ID (AT91C_ID_xxx) is used
  90 /// to identify which peripheral is targetted.
  91 /// Note that the ID must NOT be shifted (i.e. 1 << AT91C_ID_xxx).
  92 /// \param id  Peripheral ID (AT91C_ID_xxx).
  93 //------------------------------------------------------------------------------
  94 void PMC_EnablePeripheral(unsigned int id)
  95 {
  96     SANITY_CHECK(id < 32);
  97
  98     if ((AT91C_BASE_PMC->PMC_PCSR & (1 << id)) == (1 << id)) {
  99
 100         trace_LOG(trace_INFO,
 101                   "-I- PMC_EnablePeripheral: clock of peripheral"
 102                   " %u is already enabled\n\r",
 103                   id);
 104     }
 105     else {
 106
 107         AT91C_BASE_PMC->PMC_PCER = 1 << id;
 108     }
 109 }
 110
 111 //------------------------------------------------------------------------------
 112 /// Disables the clock of a peripheral. The peripheral ID (AT91C_ID_xxx) is used
 113 /// to identify which peripheral is targetted.
 114 /// Note that the ID must NOT be shifted (i.e. 1 << AT91C_ID_xxx).
 115 /// \param id  Peripheral ID (AT91C_ID_xxx).
 116 //------------------------------------------------------------------------------
 117 void PMC_DisablePeripheral(unsigned int id)
 118 {
 119     SANITY_CHECK(id < 32);
 120
 121     if ((AT91C_BASE_PMC->PMC_PCSR & (1 << id)) != (1 << id)) {
 122
 123         trace_LOG(trace_INFO,
 124                   "-I- PMC_DisablePeripheral: clock of peripheral"
 125                   " %u is not enabled\n\r",
 126                   id);
 127     }
 128     else {
 129
 130         AT91C_BASE_PMC->PMC_PCDR = 1 << id;
 131     }
 132 }
 133