Diff: targets/TARGET_Maxim/TARGET_MAX32625/mxc/wdt2.c

Revision:

150:02e0a0aed4ec

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_Maxim/TARGET_MAX32625/mxc/wdt2.c	Tue Nov 08 17:45:16 2016 +0000
@@ -0,0 +1,269 @@
+/*******************************************************************************
+ * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
+ * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Except as contained in this notice, the name of Maxim Integrated
+ * Products, Inc. shall not be used except as stated in the Maxim Integrated
+ * Products, Inc. Branding Policy.
+ *
+ * The mere transfer of this software does not imply any licenses
+ * of trade secrets, proprietary technology, copyrights, patents,
+ * trademarks, maskwork rights, or any other form of intellectual
+ * property whatsoever. Maxim Integrated Products, Inc. retains all
+ * ownership rights.
+ *
+ * $Date: 2016-03-21 15:44:11 -0500 (Mon, 21 Mar 2016) $
+ * $Revision: 22024 $
+ *
+ ******************************************************************************/
+
+/**
+ * @file    wdt2.c
+ * @brief   Watchdog 2 driver source.
+ */
+#include <stddef.h>
+#include "wdt2.h"
+#include "pwrseq_regs.h"
+
+static uint32_t interruptEnable = 0;   //keeps track to interrupts to enable in start function
+
+/******************************************************************************/
+int WDT2_Init(uint8_t runInSleep, uint8_t unlock_key)
+{
+    //enable nanoring in run and sleep mode
+    MXC_PWRSEQ->reg0 |= (MXC_F_PWRSEQ_REG0_PWR_NREN_RUN);
+
+    //unlock ctrl to be writable
+    MXC_WDT2->lock_ctrl = unlock_key;
+
+    //check to make sure it unlocked
+    if (MXC_WDT2->lock_ctrl & 0x01)
+        return E_BAD_STATE;
+
+    //disable all interrupts
+    interruptEnable = 0;
+    MXC_WDT2->enable = interruptEnable;
+
+    //enable the watchdog clock and clear all other settings
+    MXC_WDT2->ctrl = (MXC_F_WDT2_CTRL_EN_CLOCK);
+
+    //clear all interrupt flags
+    MXC_WDT2->flags = WDT2_FLAGS_CLEAR_ALL;
+
+    if(runInSleep) {
+        // turn on nanoring during sleep
+        MXC_PWRSEQ->reg0 |= (MXC_F_PWRSEQ_REG0_PWR_NREN_SLP);
+        //turn on timer during sleep
+        MXC_WDT2->ctrl |= MXC_F_WDT2_CTRL_EN_TIMER_SLP;
+    } else {
+        // turn off nanoring during sleep
+        MXC_PWRSEQ->reg0 &= ~(MXC_F_PWRSEQ_REG0_PWR_NREN_SLP);
+        //turn off timer during sleep
+        MXC_WDT2->ctrl &= ~(MXC_F_WDT2_CTRL_EN_TIMER_SLP);
+    }
+
+    //lock ctrl to read-only
+    MXC_WDT2->lock_ctrl = MXC_V_WDT2_LOCK_KEY;
+
+    return E_NO_ERROR;
+}
+
+/******************************************************************************/
+int WDT2_EnableWakeUp(wdt2_period_t int_period, uint8_t unlock_key)
+{
+    // Make sure interrupt period is valid
+    if (int_period >= WDT2_PERIOD_MAX)
+        return E_INVALID;
+
+    //unlock ctrl to be writable
+    MXC_WDT2->lock_ctrl = unlock_key;
+
+    //check to make sure it unlocked
+    if (MXC_WDT2->lock_ctrl & 0x01)
+        return E_BAD_STATE;
+
+    //stop timer and clear interval period
+    MXC_WDT2->ctrl &= ~(MXC_F_WDT2_CTRL_INT_PERIOD | MXC_F_WDT2_CTRL_EN_TIMER);
+
+    //set interval period
+    MXC_WDT2->ctrl |= (int_period << MXC_F_WDT2_CTRL_INT_PERIOD_POS);
+
+    //enable timeout wake-up
+    interruptEnable |= MXC_F_WDT2_ENABLE_TIMEOUT;
+
+    //lock ctrl to read-only
+    MXC_WDT2->lock_ctrl = MXC_V_WDT2_LOCK_KEY;
+
+    // Enable wake-up
+    MXC_PWRSEQ->msk_flags |= MXC_F_PWRSEQ_MSK_FLAGS_PWR_NANORING_WAKEUP_FLAG;
+
+    return E_NO_ERROR;
+}
+
+/******************************************************************************/
+int WDT2_DisableWakeUp(uint8_t unlock_key)
+{
+    //unlock register to be writable
+    MXC_WDT2->lock_ctrl = unlock_key;
+
+    //check to make sure it unlocked
+    if (MXC_WDT2->lock_ctrl & 0x01)
+        return E_BAD_STATE;
+
+    //disable timeout wake-up
+    interruptEnable &= ~MXC_F_WDT2_ENABLE_TIMEOUT;
+    MXC_WDT2->enable = interruptEnable;
+
+    //lock register to read-only
+    MXC_WDT2->lock_ctrl = MXC_V_WDT2_LOCK_KEY;
+
+    // disable wake-up
+    MXC_PWRSEQ->msk_flags &= ~MXC_F_PWRSEQ_MSK_FLAGS_PWR_NANORING_WAKEUP_FLAG;
+
+    return E_NO_ERROR;
+}
+
+/******************************************************************************/
+int WDT2_EnableReset(wdt2_period_t rst_period, uint8_t unlock_key)
+{
+    // Make sure reset period is valid
+    if (rst_period >= WDT2_PERIOD_MAX)
+        return E_INVALID;
+
+    //unlock ctrl to be writable
+    MXC_WDT2->lock_ctrl = unlock_key;
+
+    //check to make sure it unlocked
+    if (MXC_WDT2->lock_ctrl & 0x01)
+        return E_BAD_STATE;
+
+    //stop timer and clear reset period
+    MXC_WDT2->ctrl &= ~(MXC_F_WDT2_CTRL_RST_PERIOD | MXC_F_WDT2_CTRL_EN_TIMER);
+
+    //set reset period
+    MXC_WDT2->ctrl |= (rst_period << MXC_F_WDT2_CTRL_RST_PERIOD_POS);
+
+    //int flag has to be clear before interrupt enable can be written
+    MXC_WDT2->flags  = MXC_F_WDT2_FLAGS_RESET_OUT;
+
+    //enable reset0
+    interruptEnable |= MXC_F_WDT2_ENABLE_RESET_OUT;
+
+    //lock ctrl to read-only
+    MXC_WDT2->lock_ctrl = MXC_V_WDT2_LOCK_KEY;
+
+    //enable RSTN on WDT2 reset
+    MXC_PWRSEQ->msk_flags |= MXC_F_PWRSEQ_MSK_FLAGS_PWR_WATCHDOG_RSTN_FLAG;
+
+    return E_NO_ERROR;
+}
+
+/******************************************************************************/
+int WDT2_DisableReset(uint8_t unlock_key)
+{
+    //unlock register to be writable
+    MXC_WDT2->lock_ctrl = unlock_key;
+
+    //check to make sure it unlocked
+    if (MXC_WDT2->lock_ctrl & 0x01)
+        return E_BAD_STATE;
+
+    //disable reset
+    interruptEnable &= ~MXC_F_WDT2_ENABLE_RESET_OUT;
+    MXC_WDT2->enable = interruptEnable;
+
+    //lock register to read-only
+    MXC_WDT2->lock_ctrl = MXC_V_WDT2_LOCK_KEY;
+
+    //disable RSTN on WDT2 reset
+    MXC_PWRSEQ->msk_flags &= ~MXC_F_PWRSEQ_MSK_FLAGS_PWR_WATCHDOG_RSTN_FLAG;
+
+    return E_NO_ERROR;
+}
+
+/******************************************************************************/
+int WDT2_Start(uint8_t unlock_key)
+{
+    //check if watchdog is already running
+    if(WDT2_IsActive())
+        return E_BAD_STATE;
+
+    //unlock ctrl to be writable
+    MXC_WDT2->lock_ctrl = unlock_key;
+
+    //check to make sure it unlocked
+    if (MXC_WDT2->lock_ctrl & 0x01)
+        return E_BAD_STATE;
+
+    WDT2_Reset();
+
+    //enable interrupts
+    MXC_WDT2->enable = interruptEnable;
+
+    //start timer
+    MXC_WDT2->ctrl |= (MXC_F_WDT2_CTRL_EN_TIMER);
+
+    //lock ctrl to read-only
+    MXC_WDT2->lock_ctrl = MXC_V_WDT2_LOCK_KEY;
+
+    return E_NO_ERROR;
+}
+
+/******************************************************************************/
+void WDT2_Reset(void)
+{
+    //reset the watchdog counter
+    MXC_WDT2->clear = MXC_V_WDT2_RESET_KEY_0;
+    MXC_WDT2->clear = MXC_V_WDT2_RESET_KEY_1;
+
+    //clear all interrupt flags
+    MXC_WDT2->flags = WDT2_FLAGS_CLEAR_ALL;
+
+    //wait for all interrupts to clear
+    while(MXC_WDT2->flags != 0) {
+        MXC_WDT2->flags = WDT2_FLAGS_CLEAR_ALL;
+    }
+
+    return;
+}
+
+/******************************************************************************/
+int WDT2_Stop(uint8_t unlock_key)
+{
+    //check if watchdog is not running
+    if(!WDT2_IsActive())
+        return E_BAD_STATE;
+
+    //unlock ctrl to be writable
+    MXC_WDT2->lock_ctrl = unlock_key;
+
+    //check to make sure it unlocked
+    if (MXC_WDT2->lock_ctrl & 0x01)
+        return E_BAD_STATE;
+
+    //disabled the timer and interrupts
+    MXC_WDT2->enable = 0;
+    MXC_WDT2->ctrl &= ~(MXC_F_WDT2_CTRL_EN_TIMER);
+
+    //lock ctrl to read-only
+    MXC_WDT2->lock_ctrl = MXC_V_WDT2_LOCK_KEY;
+
+    return E_NO_ERROR;
+}