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mbed-os/targets/TARGET_Maxim/TARGET_MAX32625/mxc/wdt.c

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/*******************************************************************************
* 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;
}
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