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updated usart code

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John Cobb
2015-02-05 16:26:11 -06:00
parent 9ec955eba4
commit 86eb8f94ef
8 changed files with 1076 additions and 6 deletions
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307
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/*
FreeRTOS V8.2.0 - Copyright (C) 2015 Real Time Engineers Ltd.
All rights reserved
VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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 on the following
link: http://www.freertos.org/a00114.html
***************************************************************************
* *
* FreeRTOS provides completely free yet professionally developed, *
* robust, strictly quality controlled, supported, and cross *
* platform software that is more than just the market leader, it *
* is the industry's de facto standard. *
* *
* Help yourself get started quickly while simultaneously helping *
* to support the FreeRTOS project by purchasing a FreeRTOS *
* tutorial book, reference manual, or both: *
* http://www.FreeRTOS.org/Documentation *
* *
***************************************************************************
http://www.FreeRTOS.org/FAQHelp.html - Having a problem? Start by reading
the FAQ page "My application does not run, what could be wrong?". Have you
defined configASSERT()?
http://www.FreeRTOS.org/support - In return for receiving this top quality
embedded software for free we request you assist our global community by
participating in the support forum.
http://www.FreeRTOS.org/training - Investing in training allows your team to
be as productive as possible as early as possible. Now you can receive
FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers
Ltd, and the world's leading authority on the world's leading RTOS.
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.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.
http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High
Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS
licenses offer ticketed support, indemnification and commercial 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!
*/
/*
* This version of comtest. c is for use on systems that have limited stack
* space and no display facilities. The complete version can be found in
* the Demo/Common/Full directory.
*
* Creates two tasks that operate on an interrupt driven serial port. A
* loopback connector should be used so that everything that is transmitted is
* also received. The serial port does not use any flow control. On a
* standard 9way 'D' connector pins two and three should be connected together.
*
* The first task posts a sequence of characters to the Tx queue, toggling an
* LED on each successful post. At the end of the sequence it sleeps for a
* pseudo-random period before resending the same sequence.
*
* The UART Tx end interrupt is enabled whenever data is available in the Tx
* queue. The Tx end ISR removes a single character from the Tx queue and
* passes it to the UART for transmission.
*
* The second task blocks on the Rx queue waiting for a character to become
* available. When the UART Rx end interrupt receives a character it places
* it in the Rx queue, waking the second task. The second task checks that the
* characters removed from the Rx queue form the same sequence as those posted
* to the Tx queue, and toggles an LED for each correct character.
*
* The receiving task is spawned with a higher priority than the transmitting
* task. The receiver will therefore wake every time a character is
* transmitted so neither the Tx or Rx queue should ever hold more than a few
* characters.
*
*/
/* Scheduler include files. */
#include <stdlib.h>
#include "FreeRTOS.h"
#include "task.h"
/* Demo program include files. */
#include "serial.h"
#include "comtest.h"
#include "partest.h"
#define comSTACK_SIZE configMINIMAL_STACK_SIZE
#define comTX_LED_OFFSET ( 0 )
#define comRX_LED_OFFSET ( 1 )
#define comTOTAL_PERMISSIBLE_ERRORS ( 2 )
/* The Tx task will transmit the sequence of characters at a pseudo random
interval. This is the maximum and minimum block time between sends. */
#define comTX_MAX_BLOCK_TIME ( ( TickType_t ) 0x96 )
#define comTX_MIN_BLOCK_TIME ( ( TickType_t ) 0x32 )
#define comOFFSET_TIME ( ( TickType_t ) 3 )
/* We should find that each character can be queued for Tx immediately and we
don't have to block to send. */
#define comNO_BLOCK ( ( TickType_t ) 0 )
/* The Rx task will block on the Rx queue for a long period. */
#define comRX_BLOCK_TIME ( ( TickType_t ) 0xffff )
/* The sequence transmitted is from comFIRST_BYTE to and including comLAST_BYTE. */
#define comFIRST_BYTE ( 'A' )
#define comLAST_BYTE ( 'X' )
#define comBUFFER_LEN ( ( UBaseType_t ) ( comLAST_BYTE - comFIRST_BYTE ) + ( UBaseType_t ) 1 )
#define comINITIAL_RX_COUNT_VALUE ( 0 )
/* Handle to the com port used by both tasks. */
static xComPortHandle xPort = NULL;
/* The transmit task as described at the top of the file. */
static portTASK_FUNCTION_PROTO( vComTxTask, pvParameters );
/* The receive task as described at the top of the file. */
static portTASK_FUNCTION_PROTO( vComRxTask, pvParameters );
/* The LED that should be toggled by the Rx and Tx tasks. The Rx task will
toggle LED ( uxBaseLED + comRX_LED_OFFSET). The Tx task will toggle LED
( uxBaseLED + comTX_LED_OFFSET ). */
static UBaseType_t uxBaseLED = 0;
/* Check variable used to ensure no error have occurred. The Rx task will
increment this variable after every successfully received sequence. If at any
time the sequence is incorrect the the variable will stop being incremented. */
static volatile UBaseType_t uxRxLoops = comINITIAL_RX_COUNT_VALUE;
/*-----------------------------------------------------------*/
void vAltStartComTestTasks( UBaseType_t uxPriority, uint32_t ulBaudRate, UBaseType_t uxLED )
{
/* Initialise the com port then spawn the Rx and Tx tasks. */
uxBaseLED = uxLED;
xSerialPortInitMinimal( ulBaudRate, comBUFFER_LEN );
/* The Tx task is spawned with a lower priority than the Rx task. */
xTaskCreate( vComTxTask, "COMTx", comSTACK_SIZE, NULL, uxPriority - 1, ( TaskHandle_t * ) NULL );
xTaskCreate( vComRxTask, "COMRx", comSTACK_SIZE, NULL, uxPriority, ( TaskHandle_t * ) NULL );
}
/*-----------------------------------------------------------*/
static portTASK_FUNCTION( vComTxTask, pvParameters )
{
char cByteToSend;
TickType_t xTimeToWait;
/* Just to stop compiler warnings. */
( void ) pvParameters;
for( ;; )
{
/* Simply transmit a sequence of characters from comFIRST_BYTE to
comLAST_BYTE. */
for( cByteToSend = comFIRST_BYTE; cByteToSend <= comLAST_BYTE; cByteToSend++ )
{
if( xSerialPutChar( xPort, cByteToSend, comNO_BLOCK ) == pdPASS )
{
vParTestToggleLED( uxBaseLED + comTX_LED_OFFSET );
}
}
/* Turn the LED off while we are not doing anything. */
vParTestSetLED( uxBaseLED + comTX_LED_OFFSET, pdFALSE );
/* We have posted all the characters in the string - wait before
re-sending. Wait a pseudo-random time as this will provide a better
test. */
xTimeToWait = xTaskGetTickCount() + comOFFSET_TIME;
/* Make sure we don't wait too long... */
xTimeToWait %= comTX_MAX_BLOCK_TIME;
/* ...but we do want to wait. */
if( xTimeToWait < comTX_MIN_BLOCK_TIME )
{
xTimeToWait = comTX_MIN_BLOCK_TIME;
}
vTaskDelay( xTimeToWait );
}
} /*lint !e715 !e818 pvParameters is required for a task function even if it is not referenced. */
/*-----------------------------------------------------------*/
static portTASK_FUNCTION( vComRxTask, pvParameters )
{
signed char cExpectedByte, cByteRxed;
BaseType_t xResyncRequired = pdFALSE, xErrorOccurred = pdFALSE;
/* Just to stop compiler warnings. */
( void ) pvParameters;
for( ;; )
{
/* We expect to receive the characters from comFIRST_BYTE to
comLAST_BYTE in an incrementing order. Loop to receive each byte. */
for( cExpectedByte = comFIRST_BYTE; cExpectedByte <= comLAST_BYTE; cExpectedByte++ )
{
/* Block on the queue that contains received bytes until a byte is
available. */
if( xSerialGetChar( xPort, &cByteRxed, comRX_BLOCK_TIME ) )
{
/* Was this the byte we were expecting? If so, toggle the LED,
otherwise we are out on sync and should break out of the loop
until the expected character sequence is about to restart. */
if( cByteRxed == cExpectedByte )
{
vParTestToggleLED( uxBaseLED + comRX_LED_OFFSET );
}
else
{
xResyncRequired = pdTRUE;
break; /*lint !e960 Non-switch break allowed. */
}
}
}
/* Turn the LED off while we are not doing anything. */
vParTestSetLED( uxBaseLED + comRX_LED_OFFSET, pdFALSE );
/* Did we break out of the loop because the characters were received in
an unexpected order? If so wait here until the character sequence is
about to restart. */
if( xResyncRequired == pdTRUE )
{
while( cByteRxed != comLAST_BYTE )
{
/* Block until the next char is available. */
xSerialGetChar( xPort, &cByteRxed, comRX_BLOCK_TIME );
}
/* Note that an error occurred which caused us to have to resync.
We use this to stop incrementing the loop counter so
sAreComTestTasksStillRunning() will return false - indicating an
error. */
xErrorOccurred++;
/* We have now resynced with the Tx task and can continue. */
xResyncRequired = pdFALSE;
}
else
{
if( xErrorOccurred < comTOTAL_PERMISSIBLE_ERRORS )
{
/* Increment the count of successful loops. As error
occurring (i.e. an unexpected character being received) will
prevent this counter being incremented for the rest of the
execution. Don't worry about mutual exclusion on this
variable - it doesn't really matter as we just want it
to change. */
uxRxLoops++;
}
}
}
} /*lint !e715 !e818 pvParameters is required for a task function even if it is not referenced. */
/*-----------------------------------------------------------*/
BaseType_t xAreComTestTasksStillRunning( void )
{
BaseType_t xReturn;
/* If the count of successful reception loops has not changed than at
some time an error occurred (i.e. a character was received out of sequence)
and we will return false. */
if( uxRxLoops == comINITIAL_RX_COUNT_VALUE )
{
xReturn = pdFALSE;
}
else
{
xReturn = pdTRUE;
}
/* Reset the count of successful Rx loops. When this function is called
again we expect this to have been incremented. */
uxRxLoops = comINITIAL_RX_COUNT_VALUE;
return xReturn;
}

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/*
FreeRTOS V8.2.0 - Copyright (C) 2015 Real Time Engineers Ltd.
All rights reserved
VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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 on the following
link: http://www.freertos.org/a00114.html
***************************************************************************
* *
* FreeRTOS provides completely free yet professionally developed, *
* robust, strictly quality controlled, supported, and cross *
* platform software that is more than just the market leader, it *
* is the industry's de facto standard. *
* *
* Help yourself get started quickly while simultaneously helping *
* to support the FreeRTOS project by purchasing a FreeRTOS *
* tutorial book, reference manual, or both: *
* http://www.FreeRTOS.org/Documentation *
* *
***************************************************************************
http://www.FreeRTOS.org/FAQHelp.html - Having a problem? Start by reading
the FAQ page "My application does not run, what could be wrong?". Have you
defined configASSERT()?
http://www.FreeRTOS.org/support - In return for receiving this top quality
embedded software for free we request you assist our global community by
participating in the support forum.
http://www.FreeRTOS.org/training - Investing in training allows your team to
be as productive as possible as early as possible. Now you can receive
FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers
Ltd, and the world's leading authority on the world's leading RTOS.
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.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.
http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High
Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS
licenses offer ticketed support, indemnification and commercial 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!
*/
#ifndef COMTEST_H
#define COMTEST_H
//#include "serial.h"
void vAltStartComTestTasks( UBaseType_t uxPriority, uint32_t ulBaudRate, UBaseType_t uxLED );
void vStartComTestTasks( UBaseType_t uxPriority, eCOMPort ePort, eBaud eBaudRate );
BaseType_t xAreComTestTasksStillRunning( void );
void vComTestUnsuspendTask( void );
#endif

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/*
FreeRTOS V8.2.0 - Copyright (C) 2015 Real Time Engineers Ltd.
All rights reserved
VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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 on the following
link: http://www.freertos.org/a00114.html
***************************************************************************
* *
* FreeRTOS provides completely free yet professionally developed, *
* robust, strictly quality controlled, supported, and cross *
* platform software that is more than just the market leader, it *
* is the industry's de facto standard. *
* *
* Help yourself get started quickly while simultaneously helping *
* to support the FreeRTOS project by purchasing a FreeRTOS *
* tutorial book, reference manual, or both: *
* http://www.FreeRTOS.org/Documentation *
* *
***************************************************************************
http://www.FreeRTOS.org/FAQHelp.html - Having a problem? Start by reading
the FAQ page "My application does not run, what could be wrong?". Have you
defined configASSERT()?
http://www.FreeRTOS.org/support - In return for receiving this top quality
embedded software for free we request you assist our global community by
participating in the support forum.
http://www.FreeRTOS.org/training - Investing in training allows your team to
be as productive as possible as early as possible. Now you can receive
FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers
Ltd, and the world's leading authority on the world's leading RTOS.
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.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.
http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High
Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS
licenses offer ticketed support, indemnification and commercial 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!
*/
/*
Changes from V2.0.0
+ Use scheduler suspends in place of critical sections.
Changes from V2.6.0
+ Replaced the inb() and outb() functions with direct memory
access. This allows the port to be built with the 20050414 build of
WinAVR.
*/
#include "FreeRTOS.h"
#include "task.h"
#include "partest.h"
/*-----------------------------------------------------------
* Simple parallel port IO routines.
*-----------------------------------------------------------*/
#define partstALL_BITS_OUTPUT ( ( unsigned char ) 0xff )
#define partstALL_OUTPUTS_OFF ( ( unsigned char ) 0xff )
#define partstMAX_OUTPUT_LED ( ( unsigned char ) 7 )
static volatile unsigned char ucCurrentOutputValue = partstALL_OUTPUTS_OFF; /*lint !e956 File scope parameters okay here. */
/*-----------------------------------------------------------*/
void vParTestInitialise( void )
{
ucCurrentOutputValue = partstALL_OUTPUTS_OFF;
/* Set port B direction to outputs. Start with all output off. */
DDRB = partstALL_BITS_OUTPUT;
PORTB = ucCurrentOutputValue;
}
/*-----------------------------------------------------------*/
void vParTestSetLED( unsigned portBASE_TYPE uxLED, signed portBASE_TYPE xValue )
{
unsigned char ucBit = ( unsigned char ) 1;
if( uxLED <= partstMAX_OUTPUT_LED )
{
ucBit <<= uxLED;
vTaskSuspendAll();
{
if( xValue == pdTRUE )
{
ucBit ^= ( unsigned char ) 0xff;
ucCurrentOutputValue &= ucBit;
}
else
{
ucCurrentOutputValue |= ucBit;
}
PORTB = ucCurrentOutputValue;
}
xTaskResumeAll();
}
}
/*-----------------------------------------------------------*/
void vParTestToggleLED( unsigned portBASE_TYPE uxLED )
{
unsigned char ucBit;
if( uxLED <= partstMAX_OUTPUT_LED )
{
ucBit = ( ( unsigned char ) 1 ) << uxLED;
vTaskSuspendAll();
{
if( ucCurrentOutputValue & ucBit )
{
ucCurrentOutputValue &= ~ucBit;
}
else
{
ucCurrentOutputValue |= ucBit;
}
PORTB = ucCurrentOutputValue;
}
xTaskResumeAll();
}
}

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/*
FreeRTOS V8.2.0 - Copyright (C) 2015 Real Time Engineers Ltd.
All rights reserved
VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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 on the following
link: http://www.freertos.org/a00114.html
***************************************************************************
* *
* FreeRTOS provides completely free yet professionally developed, *
* robust, strictly quality controlled, supported, and cross *
* platform software that is more than just the market leader, it *
* is the industry's de facto standard. *
* *
* Help yourself get started quickly while simultaneously helping *
* to support the FreeRTOS project by purchasing a FreeRTOS *
* tutorial book, reference manual, or both: *
* http://www.FreeRTOS.org/Documentation *
* *
***************************************************************************
http://www.FreeRTOS.org/FAQHelp.html - Having a problem? Start by reading
the FAQ page "My application does not run, what could be wrong?". Have you
defined configASSERT()?
http://www.FreeRTOS.org/support - In return for receiving this top quality
embedded software for free we request you assist our global community by
participating in the support forum.
http://www.FreeRTOS.org/training - Investing in training allows your team to
be as productive as possible as early as possible. Now you can receive
FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers
Ltd, and the world's leading authority on the world's leading RTOS.
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.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.
http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High
Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS
licenses offer ticketed support, indemnification and commercial 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!
*/
#ifndef PARTEST_H
#define PARTEST_H
#define partstDEFAULT_PORT_ADDRESS ( ( uint16_t ) 0x378 )
void vParTestInitialise( void );
void vParTestSetLED( UBaseType_t uxLED, BaseType_t xValue );
void vParTestToggleLED( UBaseType_t uxLED );
#endif

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/*
FreeRTOS V8.2.0 - Copyright (C) 2015 Real Time Engineers Ltd.
All rights reserved
VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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 on the following
link: http://www.freertos.org/a00114.html
***************************************************************************
* *
* FreeRTOS provides completely free yet professionally developed, *
* robust, strictly quality controlled, supported, and cross *
* platform software that is more than just the market leader, it *
* is the industry's de facto standard. *
* *
* Help yourself get started quickly while simultaneously helping *
* to support the FreeRTOS project by purchasing a FreeRTOS *
* tutorial book, reference manual, or both: *
* http://www.FreeRTOS.org/Documentation *
* *
***************************************************************************
http://www.FreeRTOS.org/FAQHelp.html - Having a problem? Start by reading
the FAQ page "My application does not run, what could be wrong?". Have you
defined configASSERT()?
http://www.FreeRTOS.org/support - In return for receiving this top quality
embedded software for free we request you assist our global community by
participating in the support forum.
http://www.FreeRTOS.org/training - Investing in training allows your team to
be as productive as possible as early as possible. Now you can receive
FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers
Ltd, and the world's leading authority on the world's leading RTOS.
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.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.
http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High
Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS
licenses offer ticketed support, indemnification and commercial 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!
*/
/*
Changes from V1.2.3
+ The function xPortInitMinimal() has been renamed to
xSerialPortInitMinimal() and the function xPortInit() has been renamed
to xSerialPortInit().
Changes from V2.0.0
+ Delay periods are now specified using variables and constants of
TickType_t rather than unsigned long.
+ xQueueReceiveFromISR() used in place of xQueueReceive() within the ISR.
Changes from V2.6.0
+ Replaced the inb() and outb() functions with direct memory
access. This allows the port to be built with the 20050414 build of
WinAVR.
*/
/* BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER. */
#include <stdlib.h>
#include <avr/interrupt.h>
#include "FreeRTOS.h"
#include "queue.h"
#include "task.h"
#include "serial.h"
#define serBAUD_DIV_CONSTANT ( ( unsigned long ) 16 )
/* Constants for writing to UCSRB. */
//#define serRX_INT_ENABLE ( ( unsigned char ) 0x80 )
//#define serRX_ENABLE ( ( unsigned char ) 0x10 )
//#define serTX_ENABLE ( ( unsigned char ) 0x08 )
//#define serTX_INT_ENABLE ( ( unsigned char ) 0x20 )
#define serRX_INT_ENABLE _BV(RXCIE0)
#define serRX_ENABLE _BV(RXEN0)
#define serTX_ENABLE _BV(TXEN0)
#define serTX_INT_ENABLE _BV(UDRIE0)
/* Constants for writing to UCSRC. */
//#define serUCSRC_SELECT ( ( unsigned char ) 0x80 )
//#define serEIGHT_DATA_BITS ( ( unsigned char ) 0x06 )
#define serUCSRC_SELECT _BV(UCSZ00)
#define serEIGHT_DATA_BITS _BV(UCSZ01)
static QueueHandle_t xRxedChars;
static QueueHandle_t xCharsForTx;
#define vInterruptOn() \
{ \
unsigned char ucByte; \
\
ucByte = UCSR0B; \
ucByte |= serTX_INT_ENABLE; \
UCSR0B = ucByte; \
}
/*-----------------------------------------------------------*/
#define vInterruptOff() \
{ \
unsigned char ucInByte; \
\
ucInByte = UCSR0B; \
ucInByte &= ~serTX_INT_ENABLE; \
UCSR0B = ucInByte; \
}
/*-----------------------------------------------------------*/
xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
{
unsigned long ulBaudRateCounter;
unsigned char ucByte;
portENTER_CRITICAL();
{
/* Create the queues used by the com test task. */
xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
xCharsForTx = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
/* Calculate the baud rate register value from the equation in the
data sheet. */
ulBaudRateCounter = ( configCPU_CLOCK_HZ / ( serBAUD_DIV_CONSTANT * ulWantedBaud ) ) - ( unsigned long ) 1;
/* Set the baud rate. */
ucByte = ( unsigned char ) ( ulBaudRateCounter & ( unsigned long ) 0xff );
UBRR0L = ucByte;
ulBaudRateCounter >>= ( unsigned long ) 8;
ucByte = ( unsigned char ) ( ulBaudRateCounter & ( unsigned long ) 0xff );
UBRR0H = ucByte;
/* Enable the Rx interrupt. The Tx interrupt will get enabled
later. Also enable the Rx and Tx. */
UCSR0B = ( serRX_INT_ENABLE | serRX_ENABLE | serTX_ENABLE );
/* Set the data bits to 8. */
UCSR0C = ( serUCSRC_SELECT | serEIGHT_DATA_BITS );
}
portEXIT_CRITICAL();
/* Unlike other ports, this serial code does not allow for more than one
com port. We therefore don't return a pointer to a port structure and can
instead just return NULL. */
return NULL;
}
/*-----------------------------------------------------------*/
signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, TickType_t xBlockTime )
{
/* Only one port is supported. */
( 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;
}
}
/*-----------------------------------------------------------*/
signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, TickType_t xBlockTime )
{
/* Only one port is supported. */
( void ) pxPort;
/* Return false if after the block time there is no room on the Tx queue. */
if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
{
return pdFAIL;
}
vInterruptOn();
return pdPASS;
}
/*-----------------------------------------------------------*/
void vSerialClose( xComPortHandle xPort )
{
unsigned char ucByte;
/* The parameter is not used. */
( void ) xPort;
/* Turn off the interrupts. We may also want to delete the queues and/or
re-install the original ISR. */
portENTER_CRITICAL();
{
vInterruptOff();
ucByte = UCSR0B;
ucByte &= ~serRX_INT_ENABLE;
UCSR0B = ucByte;
}
portEXIT_CRITICAL();
}
// http://www.nongnu.org/avr-libc/user-manual/group__avr__interrupts.html
/*-----------------------------------------------------------*/
// USART, Rx Complete
//SIGNAL( SIG_UART_RECV )
ISR(USART_RX_vect)
{
signed char cChar;
signed portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
/* Get the character and post it on the queue of Rxed characters.
If the post causes a task to wake force a context switch as the woken task
may have a higher priority than the task we have interrupted. */
cChar = UDR0;
xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
if( xHigherPriorityTaskWoken != pdFALSE )
{
taskYIELD();
}
}
/*-----------------------------------------------------------*/
// USART Data Register Empty
// SIGNAL( SIG_UART_DATA )
ISR(USART_UDRE_vect)
{
signed char cChar, cTaskWoken;
if( xQueueReceiveFromISR( xCharsForTx, &cChar, &cTaskWoken ) == pdTRUE )
{
/* Send the next character queued for Tx. */
UDR0 = cChar;
}
else
{
/* Queue empty, nothing to send. */
vInterruptOff();
}
}

140
Drivers/serial.h Normal file
View File

@ -0,0 +1,140 @@
/*
FreeRTOS V8.2.0 - Copyright (C) 2015 Real Time Engineers Ltd.
All rights reserved
VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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 on the following
link: http://www.freertos.org/a00114.html
***************************************************************************
* *
* FreeRTOS provides completely free yet professionally developed, *
* robust, strictly quality controlled, supported, and cross *
* platform software that is more than just the market leader, it *
* is the industry's de facto standard. *
* *
* Help yourself get started quickly while simultaneously helping *
* to support the FreeRTOS project by purchasing a FreeRTOS *
* tutorial book, reference manual, or both: *
* http://www.FreeRTOS.org/Documentation *
* *
***************************************************************************
http://www.FreeRTOS.org/FAQHelp.html - Having a problem? Start by reading
the FAQ page "My application does not run, what could be wrong?". Have you
defined configASSERT()?
http://www.FreeRTOS.org/support - In return for receiving this top quality
embedded software for free we request you assist our global community by
participating in the support forum.
http://www.FreeRTOS.org/training - Investing in training allows your team to
be as productive as possible as early as possible. Now you can receive
FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers
Ltd, and the world's leading authority on the world's leading RTOS.
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.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.
http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High
Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS
licenses offer ticketed support, indemnification and commercial 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!
*/
#ifndef SERIAL_COMMS_H
#define SERIAL_COMMS_H
typedef void * xComPortHandle;
typedef enum
{
serCOM1,
serCOM2,
serCOM3,
serCOM4,
serCOM5,
serCOM6,
serCOM7,
serCOM8
} eCOMPort;
typedef enum
{
serNO_PARITY,
serODD_PARITY,
serEVEN_PARITY,
serMARK_PARITY,
serSPACE_PARITY
} eParity;
typedef enum
{
serSTOP_1,
serSTOP_2
} eStopBits;
typedef enum
{
serBITS_5,
serBITS_6,
serBITS_7,
serBITS_8
} eDataBits;
typedef enum
{
ser50,
ser75,
ser110,
ser134,
ser150,
ser200,
ser300,
ser600,
ser1200,
ser1800,
ser2400,
ser4800,
ser9600,
ser19200,
ser38400,
ser57600,
ser115200
} eBaud;
xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength );
xComPortHandle xSerialPortInit( eCOMPort ePort, eBaud eWantedBaud, eParity eWantedParity, eDataBits eWantedDataBits, eStopBits eWantedStopBits, unsigned portBASE_TYPE uxBufferLength );
void vSerialPutString( xComPortHandle pxPort, const signed char * const pcString, unsigned short usStringLength );
signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, TickType_t xBlockTime );
signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, TickType_t xBlockTime );
portBASE_TYPE xSerialWaitForSemaphore( xComPortHandle xPort );
void vSerialClose( xComPortHandle xPort );
#endif

4
FreeRTOSConfig.h
View File

@ -85,7 +85,7 @@
*----------------------------------------------------------*/ *----------------------------------------------------------*/
#define configUSE_PREEMPTION 1 #define configUSE_PREEMPTION 1
#define configUSE_IDLE_HOOK 0 #define configUSE_IDLE_HOOK 1
#define configUSE_TICK_HOOK 0 #define configUSE_TICK_HOOK 0
#define configCPU_CLOCK_HZ ( ( unsigned long ) F_CPU) #define configCPU_CLOCK_HZ ( ( unsigned long ) F_CPU)
#define configTICK_RATE_HZ ( ( TickType_t ) 1000 ) #define configTICK_RATE_HZ ( ( TickType_t ) 1000 )
@ -107,7 +107,7 @@ to exclude the API function. */
#define INCLUDE_vTaskPrioritySet 0 #define INCLUDE_vTaskPrioritySet 0
#define INCLUDE_uxTaskPriorityGet 0 #define INCLUDE_uxTaskPriorityGet 0
#define INCLUDE_vTaskDelete 0 #define INCLUDE_vTaskDelete 1
#define INCLUDE_vTaskCleanUpResources 0 #define INCLUDE_vTaskCleanUpResources 0
#define INCLUDE_vTaskSuspend 0 #define INCLUDE_vTaskSuspend 0
#define INCLUDE_vTaskDelayUntil 1 #define INCLUDE_vTaskDelayUntil 1

32
main.c
View File

@ -8,16 +8,40 @@
#include "FreeRTOS.h" #include "FreeRTOS.h"
#include "task.h" #include "task.h"
#include "tasks.h" // local tasks defined for os #include "tasks.h" // local tasks defined for os
#include "Drivers/partest.h"
#include "Drivers/serial.h"
#include "Drivers/comtest.h"
#include "Drivers/partest.h"
#define mainLED_TASK_PRIORITY (tskIDLE_PRIORITY)
#define mainLED_TASK_PRIORITY (tskIDLE_PRIORITY)
#define mainCOM_TEST_PRIORITY (tskIDLE_PRIORITY+1)
#define mainCOM_TEST_LED (tskIDLE_PRIORITY+2)
//#define mainLED_TASK_PRIORITY (tskIDLE_PRIORITY)
/* Baud rate used by the serial port tasks. */
#define mainCOM_TEST_BAUD_RATE (( unsigned long )38400)
void vApplicationIdleHook( void );
portSHORT main(void) portSHORT main(void)
{ {
xTaskCreate(vLEDFlashTask, (int8_t*) "LED", configMINIMAL_STACK_SIZE, NULL, mainLED_TASK_PRIORITY, NULL); //xTaskCreate(vLEDFlashTask, (int8_t*) "LED", configMINIMAL_STACK_SIZE, NULL, mainLED_TASK_PRIORITY, NULL);
vTaskStartScheduler();
while(1){} vParTestInitialise();
vAltStartComTestTasks(mainCOM_TEST_PRIORITY, mainCOM_TEST_BAUD_RATE, mainCOM_TEST_LED);
vTaskStartScheduler();
return 0; return 0;
} }
void vApplicationIdleHook( void )
{
//vCoRoutineSchedule();
}