C / C++ / MFC

Leon, Thank you for all your help with getting this working. Jim

It's memory allocation problem. the MCU has 2 cpu inside, and one set of peripheral units, compiler put str123 in DMA Access prohibited area. Embedded programming, too many tricks. :)

It actually more complex than that because on a Pi2,Pi3 you have 4 cores so you will have spinlocks/semaphores on all the devices. What are you doing with cores 1,2,3 at the moment are they still parked or in use? I assume your code isn't under linux given you have dragged the devices out to objects :-) Assuming baremetal I would strongly suggest you look at circle GitHub - rsta2/circle: A C++ bare metal environment for Raspberry Pi with USB[^] I am not sure you can develop much of a hierarchy it all needs to be fairly flat if you want to use the multicores, welcome to multicore programming :-) In vino veritas

I just like to see the value passed to struct pointer. I can deal with what the functio0n does with it myself. Perhaps it is all working correctly and my problems are elsewhere.

Thanks for the help David!

wrap_funcref(&p,&nn); //not sure does not work Where is p defined, and what is it? And where is the missing parameter that should be included per the declaration: extern "C" wrapper_API void wrap_funcref(wrap_t *m, int *h, BSTR* b); //? Some of this might also make a bit more sense if it was properly formatted between <pre lang="c++"></pre> tags, as my samples above. And the use of single letters for variable names is confusing.

Lapmangfpt wrote: j = find(MyList[i].key.begin(), MyList[i].key.end(), tkey); // ERROR 1 // If not, add key and content if (j == -1) // ERROR 2 You have to compare not wit -1, but with MyList[i].key.end()

Richard I tried for the life of me to figure out why is wasn't being rebuilt I ended up using the option allow source to be different thanks

The problem is simple Serial.println won't necessarily clear the buffer in your small 10ms delay. There is a guaranteed Line Feed character "\n" on the output with this line Serial.println(dataToSend); So you have a guaranteed packet end marker. On that poll routine you could simply also insert a timeout error handler. However the only basic requirement is the read poll loops keeping all characters it see's before a LF character. At the moment your crazy reading poll runs around a million times instead of just looking for the LF character :-) In vino veritas

Yes, that is a doc I have been using. I seems to have to run the app twice before the new device shows up as replacement for the SPI 0. Also system("ls -l /dev/fb*") does not show the fb1 on first try. Maybe I need to do some kind of "update". Just a note - perhaps fbtft is good only for fb0 / fb1. But taht doe snot matter now. It's good to know about the "speed" . It just shows to pay attention to every detail.

Sorry those three statements don't make much sense. The general way of handling situations like yours is to have the definition of the struct in a header file that multiple source modules can then include. Each source module would then declare an instance of the struct in what ever location they required, but not as a global. Having said that, there may be cases where declaring such a variable as global is the right thing to do, as its contents are shared between different modules. Only you (the application designer) can decide which is the right option.

Hi, 0xfeeefeee is a magic number[^] used by the debug heap for marking memory that's been freed. So it looks like the data at pData->pData[nSlot]; has already been freed by the time you try to read it. This probably means that the bug also exists in your 'Retail build'. A retail build with a normal heap may happily read garbage data and keep on going. You can probably debug this by setting up a memory watch[^] for &pData->pData[nSlot]; Best Wishes, -David Delaune

Yes, but it is complicated. Since you asked- I am using PC to remotely compile C++ code for Raspberry Pi. No MFC needed. My OS is Ubuntu and my IDE is Eclipse. I have no problem using String on PC locally, but the OS on Raspberry Raspbian complains about wrong version of some library. When I check the version in question it is current. Instead of trying to figure out something over my head I simply do no use String. My application is pretty much "low level bits" communication anyway. Problem solved.

I already explained that we do not have enough information. We have no idea what this code is for or how it is accessed from other applications.