* arch/xtensa/src/esp32s2/esp32s2_systemreset.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <nuttx/arch.h>
#include <nuttx/board.h>
#include "xtensa.h"
#include "hardware/esp32s2_rtccntl.h"
#include "esp32s2_systemreset.h"
* Pre-processor Definitions
****************************************************************************/
* of a system reset, for whatever reason.
*/
#define SHUTDOWN_HANDLERS_NO 4
* Private Data
****************************************************************************/
static shutdown_handler_t shutdown_handlers[SHUTDOWN_HANDLERS_NO];
* Public Functions
****************************************************************************/
* Name: esp32s2_register_shutdown_handler
*
* Description:
* This function allows you to register a handler that gets invoked before
* the application is restarted.
*
* Input Parameters:
* handler - Function to execute on restart
*
* Returned Value:
* OK on success (positive non-zero values are cmd-specific)
* Negated errno returned on failure.
*
****************************************************************************/
int esp32s2_register_shutdown_handler(shutdown_handler_t handler)
{
for (int i = 0; i < SHUTDOWN_HANDLERS_NO; i++)
{
if (shutdown_handlers[i] == handler)
{
return -EEXIST;
}
else if (shutdown_handlers[i] == NULL)
{
shutdown_handlers[i] = handler;
return OK;
}
}
return -ENOMEM;
}
* Name: esp32s2_unregister_shutdown_handler
*
* Description:
* This function allows you to unregister a handler which was previously
* registered using up_register_shutdown_handler function.
*
* Input Parameters:
* handler - Function to execute on restart
*
* Returned Value:
* OK on success (positive non-zero values are cmd-specific)
* Negated errno returned on failure.
*
****************************************************************************/
int esp32s2_unregister_shutdown_handler(shutdown_handler_t handler)
{
for (int i = 0; i < SHUTDOWN_HANDLERS_NO; i++)
{
if (shutdown_handlers[i] == handler)
{
shutdown_handlers[i] = NULL;
return OK;
}
}
return -EINVAL;
}
* Name: up_systemreset
*
* Description:
* Internal reset logic.
*
****************************************************************************/
void up_systemreset(void)
{
putreg32(RTC_CNTL_SW_SYS_RST, RTC_CNTL_OPTIONS0_REG);
for (; ; );
}