From 066332d6dcadafb897515f77b3f347f0357d813f Mon Sep 17 00:00:00 2001
From: Kaspar Schleiser <kaspar@schleiser.de>
Date: Mon, 9 Jan 2017 22:39:46 +0100
Subject: [PATCH] cpu: stm32f1: add periph/pm support
---
cpu/stm32f1/Makefile.features | 1 +
cpu/stm32f1/include/periph_cpu.h | 2 +
cpu/stm32f1/periph/pm.c | 63 ++++++++++++++++++++++++++++++++
3 files changed, 66 insertions(+)
create mode 100644 cpu/stm32f1/Makefile.features
create mode 100644 cpu/stm32f1/periph/pm.c
diff --git a/cpu/stm32f1/Makefile.features b/cpu/stm32f1/Makefile.features
new file mode 100644
index 0000000000..c4acc3744e
--- /dev/null
+++ b/cpu/stm32f1/Makefile.features
@@ -0,0 +1 @@
+FEATURE_PROVIDED += periph_pm
diff --git a/cpu/stm32f1/include/periph_cpu.h b/cpu/stm32f1/include/periph_cpu.h
index ed813b9352..e27571ec8b 100644
--- a/cpu/stm32f1/include/periph_cpu.h
+++ b/cpu/stm32f1/include/periph_cpu.h
@@ -123,6 +123,8 @@ typedef struct {
uint8_t chan; /**< DAC device used for this line */
} dac_conf_t;
+#define PM_NUM_MODES (2U)
+
#ifdef __cplusplus
}
#endif
diff --git a/cpu/stm32f1/periph/pm.c b/cpu/stm32f1/periph/pm.c
new file mode 100644
index 0000000000..25dea7f7c5
--- /dev/null
+++ b/cpu/stm32f1/periph/pm.c
@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2016 Kaspar Schleiser <kaspar@schleiser.de>
+ * 2015 Engineering-Spirit
+ *
+ * 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_stm32f1
+ * @{
+ *
+ * @file
+ * @brief Implementation of the kernels power management interface
+ *
+ * @author Nick v. IJzendoorn <nijzndoorn@engineering-spirit.nl>
+ * @author Kaspar Schleiser <kaspar@schleiser.de>
+ *
+ * @}
+ */
+
+#include "periph/pm.h"
+
+#define ENABLE_DEBUG (1)
+#include "debug.h"
+
+void pm_set(unsigned mode)
+{
+ switch (mode) {
+ case 0: /* STM Sleep mode */
+ /* Reset SLEEPDEEP bit of system control block */
+ SCB->SCR &= ~(SCB_SCR_SLEEPDEEP_Msk);
+ break;
+ case 1: /* STM Stop mode */
+ /* Clear PDDS and LPDS bits to enter stop mode on */
+ /* deepsleep with voltage regulator on */
+ PWR->CR &= ~(PWR_CR_PDDS | PWR_CR_LPDS);
+ /* Set SLEEPDEEP bit of system control block */
+ SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
+ break;
+ default:
+ DEBUG("pm: invalid power mode selected.\n");
+ }
+
+ /* Executes a device DSB (Data Synchronization Barrier) */
+ __DSB();
+ /* Enter standby mode */
+ __WFI();
+}
+
+void pm_off(void)
+{
+ /* Set PDDS to enter standby mode on deepsleep and clear flags */
+ PWR->CR |= (PWR_CR_PDDS | PWR_CR_CWUF | PWR_CR_CSBF);
+ /* Enable WKUP pin to use for wakeup from standby mode */
+ PWR->CSR |= PWR_CSR_EWUP;
+ /* Set SLEEPDEEP bit of system control block */
+ SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
+
+ __DSB();
+ __WFI();
+}
--
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