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[FreeRTOS Home] [Live FreeRTOS Forum] [FAQ] [Archive Top] [January 2008 Threads] vTaskStartTrace buffer sizePosted by natanel on January 18, 2008 Hi first sorryfor posting it in another thread, this question should be new thread
I am using vTaskStartTrace to trace tasks switch. and sending the data through the usb port which then is read and plot in matlab.
code: #if ( configUSE_TRACE_FACILITY == 1 ) //debug if((sxUSBMessage.sValue1 & TASKS_TRACE_DEBUG)==TASKS_TRACE_DEBUG) { void * pvBuffer; unsigned portLONG ulBufLength;
// write task list vTaskList( ( (signed portCHAR *)(&(scDebugBuff[0])) ) );
// length of written data ulBufLength=ulGetBufferLength(); //just return trace buf length in byte with out stoping trace
// place of putting length of data pvBuffer=((void *)(&(scDebugBuff[DEBUG_BUF_LENGTH-sizeof( unsigned portLONG )]))); // putting length of data *( unsigned portLONG * ) pvBuffer = ( unsigned portLONG ) ulBufLength;
// start new trace ulTaskEndTrace(); pvBuffer=((void *)(&(scDebugBuff[DELTA_TASK_LIST]))); vTaskStartTrace( ((signed portCHAR *)(pvBuffer)),DEBUG_BUF_LENGTH-DELTA_TASK_LIST-sizeof( unsigned portLONG ));
// send trough USB Usb_write_endpoint_in( (unsigned char *)scDebugBuff, DEBUG_BUF_LENGTH, DEBUG_BUF_LENGTH, ONE_SEC_TIMERATE>>2); } break; #endif
from matlab size it look like that dummy request for debug pause 200 msec request for debug pause 200 msec request for debug pause 200 msec request for debug pause 200 msec request for debug pause 200 msec request for debug
getting 1 around sec of tasks switch trace
then looking on the data at matlab it is two 32 bit size numbers one tick time/number and second tasks num which is a waste of space (for up to 6 tasks switch in one msec and tracing for up to 500 msec it is 8*6*500=24000 byte in mcu RAM) task num can be 8 bit size (up to 255 tasks) (and time can be one 32 bit start time and then 16 bit delta times)
I tried to modify it by changing the define
/* * Macro that writes a trace of scheduler activity to a buffer. This trace * shows which task is running when and is very useful as a debugging tool. * As this macro is called each context switch it is a good idea to undefine * it if not using the facility. */ #if ( configUSE_TRACE_FACILITY == 1 ) #define vWriteTraceToBuffer()\ {\ if( xTracing )\ {\ static unsigned portBASE_TYPE uxPreviousTask = 255;\\ if( uxPreviousTask != pxCurrentTCB->uxTCBNumber )\ {\ if( ( pcTraceBuffer + tskSIZE_OF_EACH_TRACE_LINE ) < pcTraceBufferEnd ) \ {\ uxPreviousTask = pxCurrentTCB->uxTCBNumber;\ *( unsigned portLONG * ) pcTraceBuffer = ( unsigned portLONG ) xTickCount;\ pcTraceBuffer += sizeof( unsigned portCHAR ); /* was portLONG */ \ *( unsigned portCHAR * ) pcTraceBuffer = ( unsigned portCHAR )uxPreviousTask;/* was portLONG */ \ pcTraceBuffer += sizeof( unsigned portLONG );\ }\ else \ { \ xTracing = pdFALSE; \ }\ }\ }\ }
#else
#define vWriteTraceToBuffer()
#endif
in task.c
but this just freeze my MCU (evk110 board-atmel 32bit U3A)
any ideas were and how to do it right
regards Natanel
RE: vTaskStartTrace buffer sizePosted by natanel on January 18, 2008 some how I keep see my question post as comment to another thread - sorry for the mess
RE: vTaskStartTrace buffer sizePosted by natanel on January 18, 2008 copy past mistake pcTraceBuffer += sizeof( unsigned portLONG ); \ is pcTraceBuffer += sizeof( unsigned portCHAR ); \
RE: vTaskStartTrace buffer sizePosted by sotd on January 18, 2008 Do you mean this fixes your problem or simple that this was just a mistake in your post and you still have a problem?
RE: vTaskStartTrace buffer sizePosted by natanel on January 18, 2008 mistake in my post still have a problem
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