Incrementing array names

Hello guys,

Sorryto interrupt, but I have a problem what is driving me nuts.
First of all, I have some programming background, but I am not a professional.
I learned C & C++ just by doing and informing myself. Not classes visited in college whatsoever.

So, I try to program a Atmel microcontroller using WINAVR libs and wxDevC++ (GCC compiler based).
In my coding, I have a function:


->

Code:

---

void partPicTransfer(volatile uint16_t startAddress,
                                    volatile uint8_t xSize,
                                    volatile uint16_t picSize,
                                    const uint8_t picture[]);

---

As you can see, "const uint8_t picture[]" is a unsigned int array of variable size.
While I go through the code, at one point I use a for loop and try to use global varibles to modify the array name in that function in order to get the right array at a given point.
Example:

-> Array I try to access:

Code:

---

const uint8_t GBNum1[] PROGMEM = {.....};

---

-> Global variable:

Code:

---

unsigned int thr = 0;

---

-> Execution:

Code:

---

partPicTransfer(0x681, 4, 128, GBNum(thr));

---

"thr" is the value, which should increment the array name in the loop.
That way, I get of course linker problems, since GBNum is unknown.
So, how can I make the program to recognize my operation?

Again, sorry if this is annoying you, but I worked the last 3 hours on that and still am lacking some C background.
´
I would really appreciate it, if you could give me a hand here.
Greetings,

Thomas. (LFrieza)

Code:

---

partPicTransfer(0x681, 4, 128, &GBNum[thr]);

---

perhaps?

--
Mats

Nope.
The compiler tells me that GBNum is undeclared, which is understandable, since the arraysnames are the ones I try to increment.

Array names I try to access that way (listup):

Code:

---

const uint8_t GBNum0[] PROGMEM = {.....}

to

const uint8_t GBNum9[] PROGMEM = {.....}

---

As you can see, I try actually to access the array named "GBNum0" - "GBNum9".
"thr" should therfore only increment the last part of the arrayname.

Thanks for the try though.

Greetings,
Thomas

make it 2-dimentional array instead. GBNum[9][]
If you cannot do it - use array of pointers
GBNum[9], initialize pointer to point to the corresponding arrays GBNum1, ..., GBNum9

Quote:

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Originally Posted by LFrieza

I learned C & C++ just by doing and informing myself.

---

I.e., the usual way.

You need a 2-dim array, like vart says. Or something like:

Code:

---

uint8_t **GBNum[9];
GBNum[0] = GBNum0;
...

---

Hello again,

thank you all very much for your help!
Finally, I got that problem out of my code...

Adding:

Code:

---

uint8_t *GBNumbers[10] = {GBNum0, GBNum1, GBNum2, GBNum3, GBNum4, GBNum5, GBNum6, GBNum7, GBNum8, GBNum9};

---

Using as follows:

Code:

---

      partPicTransfer(0x68C, 4, 128, GBNumbers[7]);
      partPicTransfer(0x68F, 4, 128, GBNumbers[0]);

---

Now I get to the information I wanted; thanks again for your time!
Hopefully, I will be able to help you also in the near future!

Have good nights,
Thomas