flash.c

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#include "dev/flash.h"

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

/*---------------------------------------------------------------------------*/
/*
 * The following code was taken from the avr-libc manual:
 */
void
flash_write_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;
}
/*---------------------------------------------------------------------------*/