Dear all,
I have this ultra simple strcture
typedef struct { uint8_t Hora; uint16_t Data1; } EEpromPaqueteDatosS;
When I do sizeof(EEpromPaqueteDatosS) it returns 4!!! But if I do the sizeof of the same structure with only one variable, in other words, with uint8_t variable it returns 1 and with uint16_t it returns 2.. but if the structure have the two variables it returns 4!!
Also if I copy the structure to a uint8_t vector I can found a strange byte in the middle.. like this:
EEpromPaqueteDatosS EEpromPaqueteDatos; uint8 data[4];
EEpromPaqueteDatos.Hora = 0x10; EEpromPaqueteDatos.Data1= 0x1020;
When I copy the structure to data, data is like 0x10, 0x??, 0x20, 0x10.. why this extra byte!!!!
Can anybody help me with this???
Thanks
"Is curious that the people try to say absolute solutions without knowing at all the question like use "write" o r "read" like stream or other "solutions" posted here without know other things related to the device or its operation.."
It is "curious" that the compiler must implement code to serialize read and write if you play with a packed structure. Which is a reason why the general recommendation is to not use a compiler-specific attribute to hide an issue in a way that fools other developers and can result in huge problems with concurrency etc.
It is "curious" that the normal solution is to explicitly call code that does the pack/unpack, where what happens is visible and can be debugged or potentially optimized depending on the specific needs.
That you did write the answer you did, indicates that you did not spend some time really thinking through the answers you have received. If you had, and didn't agree with some of it, you would have posted specific follow-up questions or "wouldn't this ..." comments instead.
Well, you are free to run into walls if that makes you happy. We don't care if you use problematic structures. We can suggest reasons to avoid doing it, but it is still up to you to ignore recommendations if you think maybe 3-digit years of experience isn't relevant.
Is curious that the people try to say absolute solutions without knowing at all the question like use "write" o r "read" like stream or other "solutions" posted here without know other things related to the device or its operation..
the usual reason for this is that the question was formulated in a vague way
Erik