/*
	FreeRTOS.org V5.3.1 - Copyright (C) 2003-2009 Richard Barry.

	This file is part of the FreeRTOS.org distribution.

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	under the terms of the GNU General Public License (version 2) as published
	by the Free Software Foundation and modified by the FreeRTOS exception.
	**NOTE** The exception to the GPL is included to allow you to distribute a
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	licensing section of http://www.FreeRTOS.org for full details.

	FreeRTOS.org is distributed in the hope that it will be useful,	but WITHOUT
	ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
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	You should have received a copy of the GNU General Public License along
	with FreeRTOS.org; if not, write to the Free Software Foundation, Inc., 59
	Temple Place, Suite 330, Boston, MA  02111-1307  USA.


	***************************************************************************
	*                                                                         *
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	*                                                                         *
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	* general multitasking concepts and FreeRTOS specifics. It presents and   *
	* explains numerous examples that are written using the FreeRTOS API.     *
	* Full source code for all the examples is provided in an accompanying    *
	* .zip file.                                                              *
	*                                                                         *
	***************************************************************************

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	Please ensure to read the configuration and relevant port sections of the
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	http://www.FreeRTOS.org - Documentation, latest information, license and
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*/

/*
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 xQueueHandle 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 portCHAR				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 */