/*
    FreeRTOS V7.5.3 - Copyright (C) 2013 Real Time Engineers Ltd. 
    All rights reserved

    VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.

    ***************************************************************************
     *                                                                       *
     *    FreeRTOS provides completely free yet professionally developed,    *
     *    robust, strictly quality controlled, supported, and cross          *
     *    platform software that has become a de facto standard.             *
     *                                                                       *
     *    Help yourself get started quickly and support the FreeRTOS         *
     *    project by purchasing a FreeRTOS tutorial book, reference          *
     *    manual, or both from: http://www.FreeRTOS.org/Documentation        *
     *                                                                       *
     *    Thank you!                                                         *
     *                                                                       *
    ***************************************************************************

    This file is part of the FreeRTOS distribution.

    FreeRTOS is free software; you can redistribute it and/or modify it 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 modification to the GPL is included to allow you to distribute
    >>! a combined work that includes FreeRTOS without being obliged to provide
    >>! the source code for proprietary components outside of the FreeRTOS
    >>! kernel.

    FreeRTOS 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.  Full license text is available from the following
    link: http://www.freertos.org/a00114.html

    1 tab == 4 spaces!

    ***************************************************************************
     *                                                                       *
     *    Having a problem?  Start by reading the FAQ "My application does   *
     *    not run, what could be wrong?"                                     *
     *                                                                       *
     *    http://www.FreeRTOS.org/FAQHelp.html                               *
     *                                                                       *
    ***************************************************************************

    http://www.FreeRTOS.org - Documentation, books, training, latest versions,
    license and Real Time Engineers Ltd. contact details.

    http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
    including FreeRTOS+Trace - an indispensable productivity tool, a DOS
    compatible FAT file system, and our tiny thread aware UDP/IP stack.

    http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
    Integrity Systems to sell under the OpenRTOS brand.  Low cost OpenRTOS
    licenses offer ticketed support, indemnification and middleware.

    http://www.SafeRTOS.com - High Integrity Systems also provide a safety
    engineered and independently SIL3 certified version for use in safety and
    mission critical applications that require provable dependability.

    1 tab == 4 spaces!
*/

#include <device.h>
#include "FreeRTOS.h"
#include "queue.h"
#include "task.h"
#include "serial.h"
/*---------------------------------------------------------------------------*/

#define serialSTRING_DELAY_TICKS		( portMAX_DELAY )
/*---------------------------------------------------------------------------*/

CY_ISR_PROTO( vUartRxISR );
CY_ISR_PROTO( vUartTxISR );
/*---------------------------------------------------------------------------*/

static xQueueHandle xSerialTxQueue = NULL;
static xQueueHandle xSerialRxQueue = NULL;
/*---------------------------------------------------------------------------*/

xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
{
	/* Configure Rx. */
	xSerialRxQueue = xQueueCreate( uxQueueLength, sizeof( signed char ) );	
	isr_UART1_RX_BYTE_RECEIVED_ClearPending();
	isr_UART1_RX_BYTE_RECEIVED_StartEx(vUartRxISR);

	/* Configure Tx */
	xSerialTxQueue = xQueueCreate( uxQueueLength, sizeof( signed char ) );
	isr_UART1_TX_BYTE_COMPLETE_ClearPending() ;
	isr_UART1_TX_BYTE_COMPLETE_StartEx(vUartTxISR);

	/* Clear the interrupt modes for the Tx for the time being. */
	UART_1_SetTxInterruptMode( 0 );

	/* Both configured successfully. */
	return ( xComPortHandle )( xSerialTxQueue && xSerialRxQueue );
}
/*---------------------------------------------------------------------------*/

void vSerialPutString( xComPortHandle pxPort, const signed char * const pcString, unsigned short usStringLength )
{
unsigned short usIndex = 0;

	for( usIndex = 0; usIndex < usStringLength; usIndex++ )
	{
		/* Check for pre-mature end of line. */
		if( '\0' == pcString[ usIndex ] )
		{
			break;
		}
		
		/* Send out, one character at a time. */
		if( pdTRUE != xSerialPutChar( NULL, pcString[ usIndex ], serialSTRING_DELAY_TICKS ) )
		{
			/* Failed to send, this will be picked up in the receive comtest task. */
		}
	}
}
/*---------------------------------------------------------------------------*/

signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, portTickType xBlockTime )
{
portBASE_TYPE xReturn = pdFALSE;

	if( pdTRUE == xQueueReceive( xSerialRxQueue, pcRxedChar, xBlockTime ) )
	{
		/* Picked up a character. */
		xReturn = pdTRUE;
	}
	return xReturn;
}
/*---------------------------------------------------------------------------*/

signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, portTickType xBlockTime )
{
portBASE_TYPE xReturn = pdFALSE;

	/* The ISR is processing characters is so just add to the end of the queue. */
	if( pdTRUE == xQueueSend( xSerialTxQueue, &cOutChar, xBlockTime ) )
	{	
		xReturn = pdTRUE;
	}
	else
	{
		/* The queue is probably full. */
		xReturn = pdFALSE;
	}

	/* Make sure that the interrupt will fire in the case where:
	    Currently sending so the Tx Complete will fire.
	    Not sending so the Empty will fire.	*/
	taskENTER_CRITICAL();
		UART_1_SetTxInterruptMode( UART_1_TX_STS_COMPLETE | UART_1_TX_STS_FIFO_EMPTY );
	taskEXIT_CRITICAL();
	
	return xReturn;
}
/*---------------------------------------------------------------------------*/

CY_ISR(vUartRxISR)
{
portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
volatile unsigned char ucStatus = 0;
signed char cInChar = 0;
unsigned long ulMask = 0;

	/* Read the status to acknowledge. */
	ucStatus = UART_1_ReadRxStatus();

	/* Only interested in a character being received. */
	if( 0 != ( ucStatus & UART_1_RX_STS_FIFO_NOTEMPTY ) )
	{
		/* Get the character. */
		cInChar = UART_1_GetChar();
		
		/* Mask off the other RTOS interrupts to interact with the queue. */
		ulMask = portSET_INTERRUPT_MASK_FROM_ISR();
		{
			/* Try to deliver the character. */
			if( pdTRUE != xQueueSendFromISR( xSerialRxQueue, &cInChar, &xHigherPriorityTaskWoken ) )
			{
				/* Run out of space. */
			}
		}
		portCLEAR_INTERRUPT_MASK_FROM_ISR( ulMask );
	}

	/* If we delivered the character then a context switch might be required.
	xHigherPriorityTaskWoken was set to pdFALSE on interrupt entry.  If calling 
	xQueueSendFromISR() caused a task to unblock, and the unblocked task has
	a priority equal to or higher than the currently running task (the task this
	ISR interrupted), then xHigherPriorityTaskWoken will have been set to pdTRUE and
	portEND_SWITCHING_ISR() will request a context switch to the newly unblocked
	task. */
	portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
}
/*---------------------------------------------------------------------------*/

CY_ISR(vUartTxISR)
{
portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
volatile unsigned char ucStatus = 0;
signed char cOutChar = 0;
unsigned long ulMask = 0;

	/* Read the status to acknowledge. */
	ucStatus = UART_1_ReadTxStatus();
	
	/* Check to see whether this is a genuine interrupt. */
	if( ( 0 != ( ucStatus & UART_1_TX_STS_COMPLETE ) ) || ( 0 != ( ucStatus & UART_1_TX_STS_FIFO_EMPTY ) ) )
	{	
		/* Mask off the other RTOS interrupts to interact with the queue. */
		ulMask = portSET_INTERRUPT_MASK_FROM_ISR();
		{
			if( pdTRUE == xQueueReceiveFromISR( xSerialTxQueue, &cOutChar, &xHigherPriorityTaskWoken ) )
			{
				/* Send the next character. */
				UART_1_PutChar( cOutChar );			

				/* If we are firing, then the only interrupt we are interested in
				is the Complete. The application code will add the Empty interrupt
				when there is something else to be done. */
				UART_1_SetTxInterruptMode( UART_1_TX_STS_COMPLETE );
			}
			else
			{
				/* There is no work left so disable the interrupt until the application 
				puts more into the queue. */
				UART_1_SetTxInterruptMode( 0 );
			}
		}
		portCLEAR_INTERRUPT_MASK_FROM_ISR( ulMask );
	}

	/* If we delivered the character then a context switch might be required.
	xHigherPriorityTaskWoken was set to pdFALSE on interrupt entry.  If calling 
	xQueueSendFromISR() caused a task to unblock, and the unblocked task has
	a priority equal to or higher than the currently running task (the task this
	ISR interrupted), then xHigherPriorityTaskWoken will have been set to pdTRUE and
	portEND_SWITCHING_ISR() will request a context switch to the newly unblocked
	task. */
	portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
}
/*---------------------------------------------------------------------------*/