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targets/TARGET_Maxim/TARGET_MAX32625/mxc/wdt.c
- Committer:
- amithy
- Date:
- 2017-11-09
- Revision:
- 178:c26431f84b0d
- Parent:
- 150:02e0a0aed4ec
File content as of revision 178:c26431f84b0d:
/******************************************************************************* * 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; }