let's assume a function with a pointer in input (a struct of pointers exactly)
how can i resolve these pointers and create the same struct locally so that changes to the pointers won't affect my local struct?
Please post a simple but complete sketch illustrating what you are trying to do
sample sketch from esp32 dove:
// Task to be created.
void vTaskCode( void * pvParameters )
{
for( ;; )
{
// Task code goes here.
}
}
// Function that creates a task.
void vOtherFunction( void )
{
static uint8_t ucParameterToPass;
TaskHandle_t xHandle = NULL;
// Create the task, storing the handle. Note that the passed parameter ucParameterToPass
// must exist for the lifetime of the task, so in this case is declared static. If it was just an
// an automatic stack variable it might no longer exist, or at least have been corrupted, by the time
// the new task attempts to access it.
xTaskCreate( vTaskCode, "NAME", STACK_SIZE, &ucParameterToPass, tskIDLE_PRIORITY, &xHandle );
configASSERT( xHandle );
// Use the handle to delete the task.
if( xHandle != NULL )
{
vTaskDelete( xHandle );
}
}
inside vTaskCode i only have a pointer to the arguments. i need to dereference them and keep locally (inside the task)
i can post a Better code in a couple of hours
Are these actual void pointers, or are they pointers to simple types or classes with a proper copy constructor?
i could do both.
best way would be to pass a struct with 2 or 3 pointers inside, in example 2 strings and 1 integer
I use pointers in a task like so.
void fProcessAirPressure ( void *pvParemeters )
{
int Ticks = 118; // Tick counter
bool Filled = false; // array has been filled before?
float *ptr = CollectionPressure; // pointer to the array
const int ticksTrigger = 120; // triggered at 1 minute intervals
for (;;)
{
//triggered by BME which is triggered by the 1 minute hardware timer.
xEventGroupWaitBits (eg, evtStoreAirPressure, pdTRUE, pdTRUE, portMAX_DELAY );
xSemaphoreTake( sema_CollectPressure, portMAX_DELAY );
xSemaphoreTake ( sema_eData, portMAX_DELAY );
if ( !Filled )
{
//if array has not been filled before, fill array with the same base value
for ( int j = 0; j < BufferCount; j++ )
{
*( ptr + j ) = x_eData.oPressure;
}
Filled = true;// array has been initially filled
} else {
if ( Ticks == ticksTrigger )
{
//when tick counter reaches the trigger level
//shift contents left and insert new value at the end
for ( int i = 0; i <= BufferCount - 2; i++ )
{
*( ptr + i ) = *( ptr + (i + 1) );
}
}
*( ptr + (BufferCount - 1) ) = x_eData.oPressure;//new value to be inserted
}
// find and store highest and lowest value
if ( x_eData.oPressure > x_eData.PressureH )
{
x_eData.PressureH = x_eData.oPressure;
}
if ( x_eData.oPressure < x_eData.PressureL )
{
x_eData.PressureL = x_eData.oPressure;
}
Ticks++;
if ( Ticks > ticksTrigger )
{
Ticks = 1;
}
//log_i( "ticks %d" , Ticks );
x_eData.cngPress = CalculatePressureFactors( *( ptr + 57), *( ptr + 59) ); // going back 4 hours
xSemaphoreGive( sema_eData );
xSemaphoreGive( sema_CollectPressure );
//
//log_i( " high watermark % d", uxTaskGetStackHighWaterMark( NULL ) );
} //for (;;)
vTaskDelete( NULL );
} //void fStoreAirPressure ( void *pvParemeters )
////
but you don't make use of pvParemeters inside the task...
@gandalfthegray, you apparently missed the word COMPLETE in @UKHeliBob's request. In this sense, "complete" means something that actually compiles in the Arduino IDE.
Post an example of what you are trying to do.
Most likely passing a parameter to a task that will be running continuously will not work. Instead consider sending info from one task to another via a Queue that sends a copy of the original data.
you apparently missed the phrase i can post a Better code in a couple of hours
the task is not running cintinuosly, is started on demand, does a single job then exits
So call the task, passing a parameter to the task and in the task cast the parameter to the proper data type.
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