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/*

    FreeRTOS V6.1.1 - Copyright (C) 2011 Real Time Engineers Ltd.

    ***************************************************************************

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    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 exception 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.  See the GNU General Public License for

    more details. You should have received a copy of the GNU General Public

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    by writing to Richard Barry, contact details for whom are available on the

    FreeRTOS WEB site.

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*/

/*

        BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART0.

*/

/* Scheduler includes. */

#include "FreeRTOS.h"

#include "queue.h"

#include "semphr.h"

/* Library includes. */

#include "stm32f10x_lib.h"

/* Demo application includes. */

#include "serial.h"

/*-----------------------------------------------------------*/

/* Misc defines. */

#define serINVALID_QUEUE                                ( ( xQueueHandle ) 0 )

#define serNO_BLOCK                                             ( ( portTickType ) 0 )

#define serTX_BLOCK_TIME                                ( 40 / portTICK_RATE_MS )

/*-----------------------------------------------------------*/

/* The queue used to hold received characters. */

static xQueueHandle xRxedChars;

static xQueueHandle xCharsForTx;

/*-----------------------------------------------------------*/

/* UART interrupt handler. */

void vUARTInterruptHandler( void );

/*-----------------------------------------------------------*/

/*

 * See the serial2.h header file.

 */

xComPortHandle xSerialPortInitMinimal( unsigned portLONG ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )

{

xComPortHandle xReturn;

USART_InitTypeDef USART_InitStructure;

NVIC_InitTypeDef NVIC_InitStructure;

GPIO_InitTypeDef GPIO_InitStructure;

        /* Create the queues used to hold Rx/Tx characters. */

        xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );

        xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );

        /* If the queue/semaphore was created correctly then setup the serial port

        hardware. */

        if( ( xRxedChars != serINVALID_QUEUE ) && ( xCharsForTx != serINVALID_QUEUE ) )

        {

                /* Enable USART1 clock */

                RCC_APB2PeriphClockCmd( RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE );

                /* Configure USART1 Rx (PA10) as input floating */

                GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;

                GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;

                GPIO_Init( GPIOA, &GPIO_InitStructure );

                /* Configure USART1 Tx (PA9) as alternate function push-pull */

                GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;

                GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

                GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;

                GPIO_Init( GPIOA, &GPIO_InitStructure );

                USART_InitStructure.USART_BaudRate = ulWantedBaud;

                USART_InitStructure.USART_WordLength = USART_WordLength_8b;

                USART_InitStructure.USART_StopBits = USART_StopBits_1;

                USART_InitStructure.USART_Parity = USART_Parity_No ;

                USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;

                USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;

                USART_InitStructure.USART_Clock = USART_Clock_Disable;

                USART_InitStructure.USART_CPOL = USART_CPOL_Low;

                USART_InitStructure.USART_CPHA = USART_CPHA_2Edge;

                USART_InitStructure.USART_LastBit = USART_LastBit_Disable;

                USART_Init( USART1, &USART_InitStructure );

                USART_ITConfig( USART1, USART_IT_RXNE, ENABLE );

                NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQChannel;

                NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = configLIBRARY_KERNEL_INTERRUPT_PRIORITY;

                NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;

                NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

                NVIC_Init( &NVIC_InitStructure );

                USART_Cmd( USART1, ENABLE );

        }

        else

        {

                xReturn = ( xComPortHandle ) 0;

        }

        /* This demo file only supports a single port but we have to return

        something to comply with the standard demo header file. */

        return xReturn;

}

/*-----------------------------------------------------------*/

signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed portCHAR *pcRxedChar, portTickType xBlockTime )

{

        /* The port handle is not required as this driver only supports one port. */

        ( void ) pxPort;

        /* Get the next character from the buffer.  Return false if no characters

        are available, or arrive before xBlockTime expires. */

        if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )

        {

                return pdTRUE;

        }

        else

        {

                return pdFALSE;

        }

}

/*-----------------------------------------------------------*/

void vSerialPutString( xComPortHandle pxPort, const signed portCHAR * const pcString, unsigned portSHORT usStringLength )

{

signed portCHAR *pxNext;

        /* A couple of parameters that this port does not use. */

        ( void ) usStringLength;

        ( void ) pxPort;

        /* NOTE: This implementation does not handle the queue being full as no

        block time is used! */

        /* The port handle is not required as this driver only supports UART1. */

        ( void ) pxPort;

        /* Send each character in the string, one at a time. */

        pxNext = ( signed portCHAR * ) pcString;

        while( *pxNext )

        {

                xSerialPutChar( pxPort, *pxNext, serNO_BLOCK );

                pxNext++;

        }

}

/*-----------------------------------------------------------*/

signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed portCHAR cOutChar, portTickType xBlockTime )

{

signed portBASE_TYPE xReturn;

        if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) == pdPASS )

        {

                xReturn = pdPASS;

                USART_ITConfig( USART1, USART_IT_TXE, ENABLE );

        }

        else

        {

                xReturn = pdFAIL;

        }

        return xReturn;

}

/*-----------------------------------------------------------*/

void vSerialClose( xComPortHandle xPort )

{

        /* Not supported as not required by the demo application. */

}

/*-----------------------------------------------------------*/

void vUARTInterruptHandler( void )

{

portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;

portCHAR cChar;

        if( USART_GetITStatus( USART1, USART_IT_TXE ) == SET )

        {

                /* The interrupt was caused by the THR becoming empty.  Are there any

                more characters to transmit? */

                if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )

                {

                        /* A character was retrieved from the queue so can be sent to the

                        THR now. */

                        USART_SendData( USART1, cChar );

                }

                else

                {

                        USART_ITConfig( USART1, USART_IT_TXE, DISABLE );

                }

        }

        if( USART_GetITStatus( USART1, USART_IT_RXNE ) == SET )

        {

                cChar = USART_ReceiveData( USART1 );

                xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );

        }

        portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );

}