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cpu: saml21: add periph/pm support

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This commit is contained in:
Kaspar Schleiser 2017-01-09 23:15:47 +01:00
parent c2b48ca230
commit a8c5fcc5eb
4 changed files with 61 additions and 0 deletions
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1
cpu/saml21/Makefile.features Normal file
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@ -0,0 +1 @@
FEATURES_PROVIDED += periph_pm

2
cpu/saml21/Makefile.include
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@ -1,5 +1,7 @@
export CPU_ARCH = cortex-m0plus export CPU_ARCH = cortex-m0plus
export CPU_FAM = saml21 export CPU_FAM = saml21
USEMODULE += pm_layered
include $(RIOTCPU)/sam0_common/Makefile.include include $(RIOTCPU)/sam0_common/Makefile.include
include $(RIOTCPU)/Makefile.include.cortexm_common include $(RIOTCPU)/Makefile.include.cortexm_common

2
cpu/saml21/include/periph_cpu.h
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@ -60,6 +60,8 @@ typedef enum {
/** @} */ /** @} */
#endif /* ndef DOXYGEN */ #endif /* ndef DOXYGEN */
#define PM_NUM_MODES (3)
#ifdef __cplusplus #ifdef __cplusplus
} }
#endif #endif

56
cpu/saml21/periph/pm.c Normal file
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@ -0,0 +1,56 @@
/*
* Copyright (C) 2017 Kaspar Schleiser <kaspar@schleiser.de>
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @ingroup cpu_saml21
* @{
*
* @file
* @brief Implementation of the kernels power management interface
*
* @author Kaspar Schleiser <kaspar@schleiser.de>
*
* @}
*/
#include "periph/pm.h"
#define ENABLE_DEBUG (0)
#include "debug.h"
void pm_set(unsigned mode)
{
if (mode < PM_NUM_MODES) {
uint32_t _mode;
switch (mode) {
case 0:
DEBUG("pm_set(): setting BACKUP mode.\n");
_mode = PM_SLEEPCFG_SLEEPMODE_BACKUP;
break;
case 1:
DEBUG("pm_set(): setting STANDBY mode.\n");
_mode = PM_SLEEPCFG_SLEEPMODE_STANDBY;
break;
case 2:
DEBUG("pm_set(): setting IDLE mode.\n");
_mode = PM_SLEEPCFG_SLEEPMODE_IDLE2;
break;
}
/* write sleep configuration */
PM->SLEEPCFG.bit.SLEEPMODE = _mode;
/* make sure value has been set */
while (PM->SLEEPCFG.bit.SLEEPMODE != _mode) {}
}
/* Executes a device DSB (Data Synchronization Barrier) */
__DSB();
/* Enter standby mode */
__WFI();
}