/* | |
FreeRTOS V8.0.1 - Copyright (C) 2014 Real Time Engineers Ltd. | |
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*************************************************************************** | |
* * | |
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*************************************************************************** | |
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>>! distribute a combined work that includes FreeRTOS without being !<< | |
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>>! 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 | |
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* * | |
* Having a problem? Start by reading the FAQ "My application does * | |
* not run, what could be wrong?" * | |
* * | |
* http://www.FreeRTOS.org/FAQHelp.html * | |
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*/ | |
/* | |
* Creates all the demo application tasks, then starts the scheduler. | |
* | |
* Main. c also creates a task called "Print". This only executes every five | |
* seconds but has the highest priority so is guaranteed to get processor time. | |
* Its main function is to check that all the other tasks are still operational. | |
* Nearly all the tasks in the demo application maintain a unique count that is | |
* incremented each time the task successfully completes its function. Should any | |
* error occur within the task the count is permanently halted. The print task | |
* checks the count of each task to ensure it has changed since the last time the | |
* print task executed. If any count is found not to have changed the print task | |
* displays an appropriate message, halts, and flashes the on board LED rapidly. | |
* If all the tasks are still incrementing their unique counts the print task | |
* displays an "OK" message. | |
* | |
* The LED flash tasks do not maintain a count as they already provide visual | |
* feedback of their status. | |
* | |
* The print task blocks on the queue into which messages that require displaying | |
* are posted. It will therefore only block for the full 5 seconds if no messages | |
* are posted onto the queue. | |
* | |
* Main. c also provides a demonstration of how the trace visualisation utility can | |
* be used, and how the scheduler can be stopped. | |
* | |
* On the Flashlite it is preferable not to try to write to the console during | |
* real time operation. The built in LED is toggled every cycle of the print task | |
* that does not encounter any errors, so the console IO may be removed if required. | |
* The build in LED will start flashing rapidly if any task reports an error. | |
*/ | |
/* | |
Changes from V1.01: | |
+ Previously, if an error occurred in a task the on board LED was stopped from | |
toggling. Now if an error occurs the check task enters an infinite loop, | |
toggling the LED rapidly. | |
Changes from V1.2.3 | |
+ The integer and comtest tasks are now used when the cooperative scheduler | |
is being used. Previously they were only used with the preemptive | |
scheduler. | |
Changes from V1.2.5 | |
+ Made the communications RX task a higher priority. | |
Changes from V2.0.0 | |
+ Delay periods are now specified using variables and constants of | |
TickType_t rather than unsigned long. | |
*/ | |
#include <stdlib.h> | |
#include <conio.h> | |
#include "FreeRTOS.h" | |
#include "task.h" | |
#include "partest.h" | |
#include "serial.h" | |
/* Demo file headers. */ | |
#include "BlockQ.h" | |
#include "PollQ.h" | |
#include "death.h" | |
#include "flash.h" | |
#include "integer.h" | |
#include "print.h" | |
#include "comtest.h" | |
#include "fileio.h" | |
#include "semtest.h" | |
/* Priority definitions for all the tasks in the demo application. */ | |
#define mainLED_TASK_PRIORITY ( tskIDLE_PRIORITY + 1 ) | |
#define mainCREATOR_TASK_PRIORITY ( tskIDLE_PRIORITY + 3 ) | |
#define mainPRINT_TASK_PRIORITY ( tskIDLE_PRIORITY + 5 ) | |
#define mainQUEUE_POLL_PRIORITY ( tskIDLE_PRIORITY + 2 ) | |
#define mainQUEUE_BLOCK_PRIORITY ( tskIDLE_PRIORITY + 3 ) | |
#define mainCOM_TEST_PRIORITY ( tskIDLE_PRIORITY + 3 ) | |
#define mainSEMAPHORE_TASK_PRIORITY ( tskIDLE_PRIORITY + 1 ) | |
#define mainPRINT_STACK_SIZE ( ( unsigned short ) 256 ) | |
#define mainDEBUG_LOG_BUFFER_SIZE ( ( unsigned short ) 20480 ) | |
/* Constant definitions for accessing the build in LED on the Flashlite 186. */ | |
#define mainLED_REG_DIR ( ( unsigned short ) 0xff78 ) | |
#define mainLED_REG ( ( unsigned short ) 0xff7a ) | |
/* If an error is detected in a task then the vErrorChecks() task will enter | |
an infinite loop flashing the LED at this rate. */ | |
#define mainERROR_FLASH_RATE ( ( TickType_t ) 100 / portTICK_PERIOD_MS ) | |
/* Task function for the "Print" task as described at the top of the file. */ | |
static void vErrorChecks( void *pvParameters ); | |
/* Function that checks the unique count of all the other tasks as described at | |
the top of the file. */ | |
static void prvCheckOtherTasksAreStillRunning( void ); | |
/* Functions to setup and use the built in LED on the Flashlite 186 board. */ | |
static void prvToggleLED( void ); | |
static void prvInitLED( void ); | |
/* Key presses can be used to start/stop the trace visualisation utility or stop | |
the scheduler. */ | |
static void prvCheckForKeyPresses( void ); | |
/* Buffer used by the trace visualisation utility. */ | |
static char pcWriteBuffer[ mainDEBUG_LOG_BUFFER_SIZE ]; | |
/*-----------------------------------------------------------*/ | |
short main( void ) | |
{ | |
/* Initialise hardware and utilities. */ | |
vParTestInitialise(); | |
vPrintInitialise(); | |
prvInitLED(); | |
/* CREATE ALL THE DEMO APPLICATION TASKS. */ | |
vStartComTestTasks( mainCOM_TEST_PRIORITY, serCOM2, ser38400 ); | |
vStartIntegerMathTasks( tskIDLE_PRIORITY ); | |
vStartPolledQueueTasks( mainQUEUE_POLL_PRIORITY ); | |
vStartBlockingQueueTasks( mainQUEUE_BLOCK_PRIORITY ); | |
vStartLEDFlashTasks( mainLED_TASK_PRIORITY ); | |
vStartSemaphoreTasks( mainSEMAPHORE_TASK_PRIORITY ); | |
/* Create the "Print" task as described at the top of the file. */ | |
xTaskCreate( vErrorChecks, "Print", mainPRINT_STACK_SIZE, NULL, mainPRINT_TASK_PRIORITY, NULL ); | |
/* This task has to be created last as it keeps account of the number of tasks | |
it expects to see running. */ | |
vCreateSuicidalTasks( mainCREATOR_TASK_PRIORITY ); | |
/* Set the scheduler running. This function will not return unless a task | |
calls vTaskEndScheduler(). */ | |
vTaskStartScheduler(); | |
return 1; | |
} | |
/*-----------------------------------------------------------*/ | |
static void vErrorChecks( void *pvParameters ) | |
{ | |
TickType_t xExpectedWakeTime; | |
const TickType_t xPrintRate = ( TickType_t ) 5000 / portTICK_PERIOD_MS; | |
const long lMaxAllowableTimeDifference = ( long ) 0; | |
TickType_t xWakeTime; | |
long lTimeDifference; | |
const char *pcReceivedMessage; | |
const char * const pcTaskBlockedTooLongMsg = "Print task blocked too long!\r\n"; | |
/* Stop warnings. */ | |
( void ) pvParameters; | |
/* Loop continuously, blocking, then checking all the other tasks are still | |
running, before blocking once again. This task blocks on the queue of messages | |
that require displaying so will wake either by its time out expiring, or a | |
message becoming available. */ | |
for( ;; ) | |
{ | |
/* Calculate the time we will unblock if no messages are received | |
on the queue. This is used to check that we have not blocked for too long. */ | |
xExpectedWakeTime = xTaskGetTickCount(); | |
xExpectedWakeTime += xPrintRate; | |
/* Block waiting for either a time out or a message to be posted that | |
required displaying. */ | |
pcReceivedMessage = pcPrintGetNextMessage( xPrintRate ); | |
/* Was a message received? */ | |
if( pcReceivedMessage == NULL ) | |
{ | |
/* A message was not received so we timed out, did we unblock at the | |
expected time? */ | |
xWakeTime = xTaskGetTickCount(); | |
/* Calculate the difference between the time we unblocked and the | |
time we should have unblocked. */ | |
if( xWakeTime > xExpectedWakeTime ) | |
{ | |
lTimeDifference = ( long ) ( xWakeTime - xExpectedWakeTime ); | |
} | |
else | |
{ | |
lTimeDifference = ( long ) ( xExpectedWakeTime - xWakeTime ); | |
} | |
if( lTimeDifference > lMaxAllowableTimeDifference ) | |
{ | |
/* We blocked too long - create a message that will get | |
printed out the next time around. */ | |
vPrintDisplayMessage( &pcTaskBlockedTooLongMsg ); | |
} | |
/* Check the other tasks are still running, just in case. */ | |
prvCheckOtherTasksAreStillRunning(); | |
} | |
else | |
{ | |
/* We unblocked due to a message becoming available. Send the message | |
for printing. */ | |
vDisplayMessage( pcReceivedMessage ); | |
} | |
/* Key presses are used to invoke the trace visualisation utility, or | |
end the program. */ | |
prvCheckForKeyPresses(); | |
} | |
} /*lint !e715 !e818 pvParameters is not used but all task functions must take this form. */ | |
/*-----------------------------------------------------------*/ | |
static void prvCheckForKeyPresses( void ) | |
{ | |
#ifdef USE_STDIO | |
short sIn; | |
taskENTER_CRITICAL(); | |
sIn = kbhit(); | |
taskEXIT_CRITICAL(); | |
if( sIn ) | |
{ | |
unsigned long ulBufferLength; | |
/* Key presses can be used to start/stop the trace utility, or end the | |
program. */ | |
sIn = getch(); | |
switch( sIn ) | |
{ | |
/* Only define keys for turning on and off the trace if the trace | |
is being used. */ | |
#if configUSE_TRACE_FACILITY == 1 | |
case 't' : vTaskList( pcWriteBuffer ); | |
vWriteMessageToDisk( pcWriteBuffer ); | |
break; | |
/* The legacy trace is no longer supported. Use FreeRTOS+Trace instead. | |
case 's' : vTaskStartTrace( pcWriteBuffer, mainDEBUG_LOG_BUFFER_SIZE ); | |
break; | |
case 'e' : ulBufferLength = ulTaskEndTrace(); | |
vWriteBufferToDisk( pcWriteBuffer, ulBufferLength ); | |
break;*/ | |
#endif | |
default : vTaskEndScheduler(); | |
break; | |
} | |
} | |
#else | |
( void ) pcWriteBuffer; | |
#endif | |
} | |
/*-----------------------------------------------------------*/ | |
static void prvCheckOtherTasksAreStillRunning( void ) | |
{ | |
short sErrorHasOccurred = pdFALSE; | |
if( xAreComTestTasksStillRunning() != pdTRUE ) | |
{ | |
vDisplayMessage( "Com test count unchanged!\r\n" ); | |
sErrorHasOccurred = pdTRUE; | |
} | |
if( xAreIntegerMathsTaskStillRunning() != pdTRUE ) | |
{ | |
vDisplayMessage( "Integer maths task count unchanged!\r\n" ); | |
sErrorHasOccurred = pdTRUE; | |
} | |
if( xAreBlockingQueuesStillRunning() != pdTRUE ) | |
{ | |
vDisplayMessage( "Blocking queues count unchanged!\r\n" ); | |
sErrorHasOccurred = pdTRUE; | |
} | |
if( xArePollingQueuesStillRunning() != pdTRUE ) | |
{ | |
vDisplayMessage( "Polling queue count unchanged!\r\n" ); | |
sErrorHasOccurred = pdTRUE; | |
} | |
if( xIsCreateTaskStillRunning() != pdTRUE ) | |
{ | |
vDisplayMessage( "Incorrect number of tasks running!\r\n" ); | |
sErrorHasOccurred = pdTRUE; | |
} | |
if( xAreSemaphoreTasksStillRunning() != pdTRUE ) | |
{ | |
vDisplayMessage( "Semaphore take count unchanged!\r\n" ); | |
sErrorHasOccurred = pdTRUE; | |
} | |
if( sErrorHasOccurred == pdFALSE ) | |
{ | |
vDisplayMessage( "OK " ); | |
/* Toggle the LED if everything is okay so we know if an error occurs even if not | |
using console IO. */ | |
prvToggleLED(); | |
} | |
else | |
{ | |
for( ;; ) | |
{ | |
/* An error has occurred in one of the tasks. Don't go any further and | |
flash the LED rapidly in case console IO is not being used. */ | |
prvToggleLED(); | |
vTaskDelay( mainERROR_FLASH_RATE ); | |
} | |
} | |
} | |
/*-----------------------------------------------------------*/ | |
static void prvInitLED( void ) | |
{ | |
unsigned short usPortDirection; | |
const unsigned short usLEDOut = 0x400; | |
/* Set the LED bit to an output. */ | |
usPortDirection = inpw( mainLED_REG_DIR ); | |
usPortDirection &= ~usLEDOut; | |
outpw( mainLED_REG_DIR, usPortDirection ); | |
} | |
/*-----------------------------------------------------------*/ | |
static void prvToggleLED( void ) | |
{ | |
static short sLED = pdTRUE; | |
unsigned short usLEDState; | |
const unsigned short usLEDBit = 0x400; | |
/* Flip the state of the LED. */ | |
usLEDState = inpw( mainLED_REG ); | |
if( sLED ) | |
{ | |
usLEDState &= ~usLEDBit; | |
} | |
else | |
{ | |
usLEDState |= usLEDBit; | |
} | |
outpw( mainLED_REG, usLEDState ); | |
sLED = !sLED; | |
} | |