I have a overlay problem: I've got one function who is called from main and from my interrupt service routine. When the interrupt calls the function my local variables point to an indefinite adress. I have the problem however I deactivate overlaing. My programm:
void main (void) { ... eventChannelPtr = XSDevice_GetEventChanByID( &XSIM_DeviceGroups, groupID, chanID)} } void task_1ms(void) interrupt 1 using 1 { ... eventChannelPtr = XSDevice_GetEventChanByID( &XSIM_DeviceGroups, groupID, chanID); } tXSEvent_ChannelPtr XSDevice_GetEventChanByID( tXSDevice_DeviceEntry* deviceEntryPtr, tXS_Group groupID, tXS_Channel chanID) { tXSEvent_SourcePtr eventSrcEntry; tXSEvent_ChannelPtr retVal; ... eventSrcEntry = &deviceEntryPtr->eventListPtr[groupID]; }
I have the problem however I deactivate overlaing. Deactivating overlaying only stops different functions from using the same memory address for their local variables. It does nothing to prevent reentrant calls to the same function from using the same memory address for each reentrant call, that is what the reentrant keyword is for.
My function is called 3 times at main (interrupts are disabled). Then the main is in a while(1) and only my interrupt use the function. But with the keyword reentrant the problem is solved. Do you expect eventSrcEntry to keep its value after the function returns until the next call ? No I don't expect this. My function get mi an adress (of an global variable) as return value and I don't work with eventSrcEntry.