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AT90USB162 Arkusz danych(PDF) 16 Page - ATMEL Corporation |
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AT90USB162 Arkusz danych(HTML) 16 Page - ATMEL Corporation |
16 / 28 page 16 7618C–AVR–07/08 The API are located at absolute addresses in the USB bootloader firmware and accept specific registers values as parameters. These parameters are compatible with a C compiler calling con- vention and thus can be called directly with function pointer declared as in the example below: The full assembly code for the flash API drivers is given in “Appendix-B” on page 20. C Code Example #if (FLASH_END==0x1FFFF) //128K bytes parts #define LAST_BOOT_ENTRY 0xFFFE #elif (FLASH_END==0xFFFF)//64K bytes parts #define LAST_BOOT_ENTRY 0x7FFE #else #error You must define FLASH_END in bytes. #endif // These functions pointers are used to call functions entry points in bootloader void (*boot_flash_page_erase_and_write)(unsigned long adr)=(void (*)(unsigned long))(LAST_BOOT_ENTRY-12); U8 (*boot_flash_read_sig) (unsigned long adr)=(U8 (*)(unsigned long))(LAST_BOOT_ENTRY-10); U8 (*boot_flash_read_fuse) (unsigned long adr)=(U8 (*)(unsigned long))(LAST_BOOT_ENTRY-8); void (*boot_flash_fill_temp_buffer) (unsigned int data,unsigned int adr)=(void (*)(unsigned int, unsigned int))(LAST_BOOT_ENTRY-6); void (*boot_flash_prg_page) (unsigned long adr)=(void (*)(unsigned long))(LAST_BOOT_ENTRY-4); void (*boot_flash_page_erase) (unsigned long adr)=(void (*)(unsigned long))(LAST_BOOT_ENTRY-2); void (*boot_lock_wr_bits) (unsigned char val)=(void (*)(unsigned char))(LAST_BOOT_ENTRY); // This function writes 0x55AA @ 0x1200 in the on-flash calling flash drivers located in USB bootloader void basic_flash_access(void) { unsigned long address; unsigned int temp16; temp16=0x55AA; address=0x12000; (*boot_flash_fill_temp_buffer)(temp16,address); (*boot_flash_page_erase)(address); (*boot_flash_prg_page)(address); } |
Podobny numer części - AT90USB162 |
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Podobny opis - AT90USB162 |
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