boot.c

#include <avr/boot.h>
#include <avr/interrupt.h>

/* This is called "boot_program_page" in the main code,
 * but as that's a non-weak symbol this would clash.
 */
void _boot_program_page (uint32_t page, uint8_t *buf)
{
    uint16_t i;
    uint8_t sreg;
 
    /* Disable interrupts.*/
    sreg = SREG;
    cli();
 
    eeprom_busy_wait ();
 
    boot_page_erase (page);
    boot_spm_busy_wait ();      /* Wait until the memory is erased. */
 
    for (i=0; i<SPM_PAGESIZE; i+=2)
    {
        /* Set up little-endian word. */
        uint16_t w = *buf++;
        w += (*buf++) << 8;
 
        boot_page_fill (page + i, w);
    }
    boot_page_write (page);     /* Store buffer in flash page.		*/
    boot_spm_busy_wait();       /* Wait until the memory is written.*/
 
    /* Reenable RWW-section again. We need this if we want to jump back */
    /* to the application after bootloading. */
    boot_rww_enable ();
 
    /* Re-enable interrupts (if they were ever enabled). */
    SREG = sreg;
}