1 files changed, 122 insertions, 0 deletions
diff --git a/nuttx/arch/arm/src/stm32/stm32_pmstop.c b/nuttx/arch/arm/src/stm32/stm32_pmstop.c
new file mode 100644
index 000000000..14ce63b55
--- /dev/null
+++ b/nuttx/arch/arm/src/stm32/stm32_pmstop.c
@@ -0,0 +1,122 @@
+/****************************************************************************
+ * arch/arm/src/stm32/stm32_pmstop.c
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdbool.h>
+
+#include "up_arch.h"
+#include "nvic.h"
+#include "stm32_pwr.h"
+#include "stm32_pm.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: stm32_pmstop
+ *
+ * Description:
+ *   Enter STOP mode. 
+ *
+ * Input Parameters:
+ *   lpds - true: To further reduce power consumption in Stop mode, put the
+ *          internal voltage regulator in low-power mode using the LPDS bit
+ *          of the Power control register (PWR_CR).
+ *
+ * Returned Value:
+ *   Zero means that the STOP was successfully entered and the system has
+ *   been re-awakened.  The internal volatage regulator is back to its
+ *   original state.  Otherwise, STOP mode did not occur and a negated
+ *   errno value is returned to indicate the cause of the failure.
+ *
+ ****************************************************************************/
+
+int stm32_pmstop(bool lpds)
+{
+  uint32_t regval;
+
+  /* Clear the Power Down Deep Sleep (PDDS) and the Low Power Deep Sleep
+   * (LPDS)) bits in the power control register.
+   */
+
+  regval  = getreg32(STM32_PWR_CR);
+  regval &= ~(PWR_CR_LPDS | PWR_CR_PDDS);
+
+  /* Set the Low Power Deep Sleep (LPDS) bit if so requested */
+
+  if (lpds)
+    {
+      regval |= PWR_CR_LPDS;
+    }
+ 
+  putreg32(regval, STM32_PWR_CR);
+
+  /* Set SLEEPDEEP bit of Cortex System Control Register */
+
+  regval  = getreg32(NVIC_SYSCON);
+  regval |= NVIC_SYSCON_SLEEPDEEP;
+  putreg32(regval, NVIC_SYSCON);
+  
+  /* Sleep until the wakeup interrupt or event occurs */
+
+#ifdef CONFIG_PM_WFE
+  /* Mode: SLEEP + Entry with WFE */
+
+  asm("wfe");
+#else
+  /* Mode: SLEEP + Entry with WFI */
+
+  asm("wfi"); 
+#endif
+  return OK;
+}