[avr-gcc-list] How to use pointers to program memory?

[Anich Gregor]

Hi!

I have a function to transmit data, but it is able to transmit only up to a 
maximum of 8 bytes at once. I have another function which shall now take data 
from the .text section, put it into RAM and then tell the other function to 
send that RAM.
How do i tell the compiler that the input to my function is a pointer to data 
which is stored in the .text section that it uses the right instructions to 
load bytes?
Do i have to put __attribute__(( section( ".text" ) )) somewhere onto const 
unsigned char *data?

Thanks,
  Gregor

The function:
static void usb_send_descriptor( const unsigned char *data, unsigned char 
length )
{
        volatile unsigned char *p;
        unsigned char l;

        // wait until buffer is empty
        while (ep0_send_size != 0)
                __asm__ volatile ( "nop" );

        // send data
        *ep0_send_buf = PID_DATA0;
        while (length >= 8)
        {
                p = ep0_send_buf+1;

                // copy 8 bytes
                *p++ = *data++;
                *p++ = *data++;
                *p++ = *data++;
                *p++ = *data++;
                *p++ = *data++;
                *p++ = *data++;
                *p++ = *data++;
                *p++ = *data++;

                // send 8 bytes
                ep0_send_size = 9;
                while (ep0_send_size != 0)
                        __asm__ volatile ( "nop" );
                length -= 8;
        }

        p = ep0_send_buf+1;
        l = length;
        do
                *p++ = *data++;
        while (--l);
        ep0_send_size = length+1;
}