int main(void)

 {

     ...

     串口初始化

     printf("Flashwrite example\r\n");

     patold  = ;

     pg_size = NRF_FICR->CODEPAGESIZE;

     pg_num  = NRF_FICR->CODESIZE - ;  // Use last page in flash

     while (true)

     {

         // Start address:

15         addr = (uint32_t *)(pg_size * pg_num);//计算地址并擦除一页

16         // Erase page:

17         flash_page_erase(addr);

         i = ;

         do

         {

             printf("Enter char to write to flash\r\n");

             // Read char from uart, and write it to flash:

25             do

26             {

27                 err_code = app_uart_get(&patwr);

28             }

29             while(err_code == NRF_ERROR_NOT_FOUND);//从串口获得1byte数据



31             if (patold != patwr)//将1byte写入flash

32             {

33                 patold = patwr;

34                 flash_word_write(++addr, (uint32_t)patwr);

35                 i += 4;

36                 printf("'%c' was write to flash\r\n", patwr);

37             }

             // Read pattern from flash and send it back:

             patrd = (uint8_t) * addr;

             printf("'%c' was read from flash\r\n", patrd);

         }

         while (i < pg_size);

     }

 }