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

Revision:

151:02e0a0aed4ec

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_Maxim/TARGET_MAX32625/mxc/wdt.c	Tue Nov 08 17:45:16 2016 +0000
@@ -0,0 +1,286 @@
+/*******************************************************************************
+ * 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    wdt.c
+ * @brief   Watchdog driver source.
+ */
+
+#include <stddef.h>
+#include "wdt.h"
+
+static uint32_t interruptEnable = 0;   //keeps track to interrupts to enable in start function
+
+/******************************************************************************/
+int WDT_Init(mxc_wdt_regs_t *wdt, const sys_cfg_wdt_t *cfg, uint8_t unlock_key)
+{
+    if ((wdt == NULL) || (cfg == NULL))
+        return E_NULL_PTR;
+
+    //setup watchdog clock
+    SYS_WDT_Init(wdt, cfg);
+
+    //unlock ctrl to be writable
+    wdt->lock_ctrl = unlock_key;
+
+    //check to make sure it unlocked
+    if (wdt->lock_ctrl & 0x01)
+        return E_BAD_STATE;
+
+    //disable all interrupts
+    interruptEnable = 0;
+    wdt->enable = interruptEnable;
+
+    //enable the watchdog clock and clear all other settings
+    wdt->ctrl = MXC_F_WDT_CTRL_EN_CLOCK;
+
+    //clear all interrupt flags
+    wdt->flags = WDT_FLAGS_CLEAR_ALL;
+
+    //lock ctrl to read-only
+    wdt->lock_ctrl = MXC_V_WDT_LOCK_KEY;
+
+    return E_NO_ERROR;
+}
+
+/******************************************************************************/
+int WDT_EnableInt(mxc_wdt_regs_t *wdt, wdt_period_t int_period, uint8_t unlock_key)
+{
+    //unlock ctrl to be writable
+    wdt->lock_ctrl = unlock_key;
+
+    //check to make sure it unlocked
+    if (wdt->lock_ctrl & 0x01)
+        return E_BAD_STATE;
+
+    //stop timer and clear interval period
+    wdt->ctrl &= ~(MXC_F_WDT_CTRL_INT_PERIOD | MXC_F_WDT_CTRL_EN_TIMER);
+
+    //set interval period
+    wdt->ctrl |= (int_period << MXC_F_WDT_CTRL_INT_PERIOD_POS);
+
+    //enable timeout interrupt
+    interruptEnable |= MXC_F_WDT_ENABLE_TIMEOUT;
+
+    //lock ctrl to read-only
+    wdt->lock_ctrl = MXC_V_WDT_LOCK_KEY;
+
+    return E_NO_ERROR;
+}
+
+/******************************************************************************/
+int WDT_DisableInt(mxc_wdt_regs_t *wdt, uint8_t unlock_key)
+{
+    //unlock register to be writable
+    wdt->lock_ctrl = unlock_key;
+
+    //check to make sure it unlocked
+    if (wdt->lock_ctrl & 0x01)
+        return E_BAD_STATE;
+
+    //disable timeout interrupt
+    interruptEnable &= ~MXC_F_WDT_ENABLE_TIMEOUT;
+    wdt->enable = interruptEnable;
+
+    //lock register to read-only
+    wdt->lock_ctrl = MXC_V_WDT_LOCK_KEY;
+
+    return E_NO_ERROR;
+}
+
+/******************************************************************************/
+int WDT_EnableWait(mxc_wdt_regs_t *wdt, wdt_period_t wait_period, uint8_t unlock_key)
+{
+    // Make sure wait_period is valid
+    if (wait_period >= WDT_PERIOD_MAX)
+        return E_INVALID;
+
+    //unlock ctrl to be writable
+    wdt->lock_ctrl = unlock_key;
+
+    //check to make sure it unlocked
+    if (wdt->lock_ctrl & 0x01)
+        return E_BAD_STATE;
+
+    //stop timer and clear wait period
+    wdt->ctrl &= ~(MXC_F_WDT_CTRL_WAIT_PERIOD | MXC_F_WDT_CTRL_EN_TIMER);
+
+    //set wait period
+    wdt->ctrl |= (wait_period << MXC_F_WDT_CTRL_WAIT_PERIOD_POS);
+
+    //enable wait interrupt
+    interruptEnable |= MXC_F_WDT_ENABLE_PRE_WIN;
+
+    //lock ctrl to read-only
+    wdt->lock_ctrl = MXC_V_WDT_LOCK_KEY;
+
+    return E_NO_ERROR;
+}
+
+/******************************************************************************/
+int WDT_DisableWait(mxc_wdt_regs_t *wdt, uint8_t unlock_key)
+{
+    //unlock register to be writable
+    wdt->lock_ctrl = unlock_key;
+
+    //check to make sure it unlocked
+    if (wdt->lock_ctrl & 0x01)
+        return E_BAD_STATE;
+
+    //disable wait interrupt
+    interruptEnable &= ~MXC_F_WDT_ENABLE_PRE_WIN;
+    wdt->enable = interruptEnable;
+
+    //lock register to read-only
+    wdt->lock_ctrl = MXC_V_WDT_LOCK_KEY;
+
+    return E_NO_ERROR;
+}
+
+/******************************************************************************/
+int WDT_EnableReset(mxc_wdt_regs_t *wdt, wdt_period_t rst_period, uint8_t unlock_key)
+{
+    // Make sure wait_period is valid
+    if (rst_period >= WDT_PERIOD_MAX)
+        return E_INVALID;
+
+    //unlock ctrl to be writable
+    wdt->lock_ctrl = unlock_key;
+
+    //check to make sure it unlocked
+    if (wdt->lock_ctrl & 0x01)
+        return E_BAD_STATE;
+
+    //stop timer and clear reset period
+    wdt->ctrl &= ~(MXC_F_WDT_CTRL_RST_PERIOD | MXC_F_WDT_CTRL_EN_TIMER);
+
+    //set reset period
+    wdt->ctrl |= (rst_period << MXC_F_WDT_CTRL_RST_PERIOD_POS);
+
+    //enable reset0
+    interruptEnable |= MXC_F_WDT_ENABLE_RESET_OUT;
+
+    //lock ctrl to read-only
+    wdt->lock_ctrl = MXC_V_WDT_LOCK_KEY;
+
+    return E_NO_ERROR;
+}
+
+/******************************************************************************/
+int WDT_DisableReset(mxc_wdt_regs_t *wdt, uint8_t unlock_key)
+{
+    //unlock register to be writable
+    wdt->lock_ctrl = unlock_key;
+
+    //check to make sure it unlocked
+    if (wdt->lock_ctrl & 0x01)
+        return E_BAD_STATE;
+
+    //disable reset0
+    interruptEnable &= ~MXC_F_WDT_ENABLE_RESET_OUT;
+    wdt->enable = interruptEnable;
+
+    //lock register to read-only
+    wdt->lock_ctrl = MXC_V_WDT_LOCK_KEY;
+
+    return E_NO_ERROR;
+}
+
+/******************************************************************************/
+int WDT_Start(mxc_wdt_regs_t *wdt, uint8_t unlock_key)
+{
+    //check if watchdog is already running
+    if(WDT_IsActive(wdt))
+        return E_BAD_STATE;
+
+    //unlock ctrl to be writable
+    wdt->lock_ctrl = unlock_key;
+
+    //check to make sure it unlocked
+    if (wdt->lock_ctrl & 0x01)
+        return E_BAD_STATE;
+
+    WDT_Reset(wdt);
+
+    //enable interrupts
+    wdt->enable = interruptEnable;
+
+    //start timer
+    wdt->ctrl |= MXC_F_WDT_CTRL_EN_TIMER;
+
+    //lock ctrl to read-only
+    wdt->lock_ctrl = MXC_V_WDT_LOCK_KEY;
+
+    return E_NO_ERROR;
+}
+
+/******************************************************************************/
+void WDT_Reset(mxc_wdt_regs_t *wdt)
+{
+    //reset the watchdog counter
+    wdt->clear = MXC_V_WDT_RESET_KEY_0;
+    wdt->clear = MXC_V_WDT_RESET_KEY_1;
+
+    //clear all interrupt flags
+    wdt->flags = WDT_FLAGS_CLEAR_ALL;
+
+    //wait for all interrupts to clear
+    while(wdt->flags != 0) {
+        wdt->flags = WDT_FLAGS_CLEAR_ALL;
+    }
+
+    return;
+}
+
+/******************************************************************************/
+int WDT_Stop(mxc_wdt_regs_t *wdt, uint8_t unlock_key)
+{
+    //unlock ctrl to be writable
+    wdt->lock_ctrl = unlock_key;
+
+    //check to make sure it unlocked
+    if (wdt->lock_ctrl & 0x01)
+        return E_BAD_STATE;
+
+    //disabled the timer and interrupts
+    wdt->enable = 0;
+    wdt->ctrl &= ~(MXC_F_WDT_CTRL_EN_TIMER);
+
+    //lock ctrl to read-only
+    wdt->lock_ctrl = MXC_V_WDT_LOCK_KEY;
+
+    return E_NO_ERROR;
+}