Hi,
I'm converting a USB CDC sample that I found in the net to run on my 18F4550.
At preset the code is too big to fit into my memory, so I need to squeeze it
a bit. On inspecting the source code and generated code I noticed
quite a bit of code gets emitter because of the use of generic pointers.
For example there is:
static unsigned char *out_ptr; // Data to send to the host
static unsigned char *in_ptr; // Data from the host
which gets used like:
for (i=0;i<bufferSize;i++)
{
*in_ptr++ = *out_ptr++;
}
and like:
code config_struct config_descriptor = {
<snip>
out_ptr = (unsigned char *)&config_descriptor;
count = *(out_ptr + 2);
So the data pointed to is sometimes in ROM/code (the USB descriptors)
and some times in RAM.
Quite a lot of code and some library calls gets emitted for all this.
What would be my best strategy to rework this?
br Kusti
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