4 * \brief Sleep mode access
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6 * Copyright (c) 2012 Atmel Corporation. All rights reserved.
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12 * Redistribution and use in source and binary forms, with or without
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13 * modification, are permitted provided that the following conditions are met:
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15 * 1. Redistributions of source code must retain the above copyright notice,
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16 * this list of conditions and the following disclaimer.
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18 * 2. Redistributions in binary form must reproduce the above copyright notice,
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19 * this list of conditions and the following disclaimer in the documentation
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20 * and/or other materials provided with the distribution.
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22 * 3. The name of Atmel may not be used to endorse or promote products derived
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23 * from this software without specific prior written permission.
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25 * 4. This software may only be redistributed and used in connection with an
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26 * Atmel microcontroller product.
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28 * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
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29 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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30 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
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31 * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
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32 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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36 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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37 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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38 * POSSIBILITY OF SUCH DAMAGE.
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51 #include <compiler.h>
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54 * \defgroup sleep_group Backup Power Manager (BPM)
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56 * This is a stub on the SAM4L Backup Power Manager(BPM) for the sleepmgr service.
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58 * \note To minimize the code overhead, these functions do not feature
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59 * interrupt-protected access since they are likely to be called inside
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60 * interrupt handlers or in applications where such protection is not
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61 * necessary. If such protection is needed, it must be ensured by the calling
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67 #if defined(__DOXYGEN__)
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69 * \brief Sets the MCU in the specified sleep mode
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70 * \param sleep_mode Sleep mode to set.
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76 static inline void bpm_sleep(Bpm *bpm, uint32_t sleep_mode)
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80 /* Read PMCON register */
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81 pmcon = bpm->BPM_PMCON;
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82 pmcon &= ~BPM_PMCON_BKUP;
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83 pmcon &= ~BPM_PMCON_RET;
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84 pmcon &= ~BPM_PMCON_SLEEP_Msk;
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86 /* Unlock PMCON register */
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89 if (sleep_mode == BPM_SM_SLEEP_0) {
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90 pmcon |= BPM_PMCON_SLEEP(0);
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91 bpm->BPM_PMCON = pmcon;
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92 SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
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93 } else if (sleep_mode == BPM_SM_SLEEP_1) {
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94 pmcon |= BPM_PMCON_SLEEP(1);
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95 bpm->BPM_PMCON = pmcon;
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96 SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
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97 } else if (sleep_mode == BPM_SM_SLEEP_2) {
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98 pmcon |= BPM_PMCON_SLEEP(2);
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99 bpm->BPM_PMCON = pmcon;
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100 SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
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101 } else if (sleep_mode == BPM_SM_SLEEP_3) {
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102 pmcon |= BPM_PMCON_SLEEP(3);
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103 bpm->BPM_PMCON = pmcon;
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104 SCB->SCR &= ~SCB_SCR_SLEEPDEEP_Msk;
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105 } else if (sleep_mode == BPM_SM_WAIT) {
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106 bpm->BPM_PMCON = pmcon;
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107 SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
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108 } else if (sleep_mode == BPM_SM_RET) {
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109 pmcon |= BPM_PMCON_RET;
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110 bpm->BPM_PMCON = pmcon;
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111 SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
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112 } else { /* if (sleep_mode == BPM_SM_BACKUP) */
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113 pmcon |= BPM_PMCON_BKUP;
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114 bpm->BPM_PMCON = pmcon;
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115 SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
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118 /* Wait until vreg is ok. */
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119 while(!(BSCIF->BSCIF_PCLKSR & BSCIF_PCLKSR_VREGOK));
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120 asm volatile ("wfi");
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121 /* ensure sleep request propagation to flash. */
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122 asm volatile ("nop");
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124 /* The interrupts wake-up from the previous wfi, but there are still
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125 * masked since we are in the critical section thanks to the previous
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126 * set_pri_mask(1). Thus, we need to leave the critical section.
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127 * Please note that we should probably use something like
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128 * cpu_leave_critical(), using set_pri_mask(0)
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140 #endif /* SLEEP_H */
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