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/*
* FreeRTOS Kernel V10.2.1
* Copyright (C) 2019 Amazon.com, Inc. or its affiliates. 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 THE AUTHORS OR
* COPYRIGHT HOLDERS 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.
*
* http://www.FreeRTOS.org
* http://aws.amazon.com/freertos
*
* 1 tab == 4 spaces!
*/
/*
Changes from V3.0.0
+ ISRcode pulled inline to reduce stack-usage.
+ Added functionality to only call vTaskSwitchContext() once
when handling multiple interruptsources in a single interruptcall.
+ Filename changed to a .c extension to allow stepping through code
using F7.
Changes from V3.0.1
*/
#ifndef _FREERTOS_SERIAL_ISRSERIALTX_C
#define _FREERTOS_SERIAL_ISRSERIALTX_C
#define serINTERRUPT_DISABLED ( 0 )
{
/*
* Was the interrupt the Tx register becoming empty?
*/
if( bTXIF && bTXIE)
{
/*
* Queue to interface between comms API and interrupt routine.
*/
extern QueueHandle_t xCharsForTx;
/*
* Because we are not allowed to use local variables here,
* PRODL and PRODH are (ab)used as temporary storage. This
* is allowed because these SFR's will be restored before
* exiting the ISR.
*/
extern char cChar;
#pragma locate cChar &PRODL
extern portBASE_TYPE pxTaskWoken;
#pragma locate pxTaskWoken &PRODH
if( xQueueReceiveFromISR( xCharsForTx, &cChar, &pxTaskWoken ) == pdTRUE )
{
/*
* Send the next character queued for Tx.
*/
TXREG = cChar;
}
else
{
/*
* Queue empty, nothing to send.
*/
bTXIE = serINTERRUPT_DISABLED;
}
/*
* If we woke another task, ask for a contextswitch
*/
if( pxTaskWoken == pdTRUE )
{
uxSwitchRequested = pdTRUE;
}
}
}
#endif /* _FREERTOS_SERIAL_ISRSERIALTX_C */
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