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AT90USB128X Datasheet(PDF) 8 Page - ATMEL Corporation |
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AT90USB128X Datasheet(HTML) 8 Page - ATMEL Corporation |
8 / 28 page 8 7618C–AVR–07/08 4.5.3 Device State The state reported is the current state of the device up to transmission of the response. The val- ues specified in the bState field are identical to those reported in DFU_GETSTATUS. 4.5.4 DFU_ABORT request The DFU_ABORT request forces the device to exit from any other state and return to the DFU_IDLE state. The device sets the OK status on receipt of this request. For more information, see the corresponding state transition summary. 4.6 Programming the Flash or EEPROM Data The firmware image is downloaded via control-write transfers initiated by the DFU_DNLOAD class-specific request. The host sends between bMaxPacketSize0 and wTransferSize bytes to the device in a control-write transfer. Following each downloaded block, the host solicits the device status with the DFU_GETSTATUS request. As described in the USB DFU Specification, "Firmware images for specific devices are, by defi- nition, vendor specific. It is therefore required that target addresses, record sizes, and all other information relative to supporting an upgrade are encapsulated within the firmware image file. It is the responsibility of the device manufacturer and the firmware developer to ensure that their devices can process these encapsulated data. With the exception of the DFU file suffix, the con- tent of the firmware image file is irrelevant to the host." Firmware image: • 32 bytes: Command • X bytes: X is the number of byte (00h) added before the first significant byte of the firmware. The X number is calculated to align the beginning of the firmware with the flash page. X = start_address [32]. For example, if the start address is 00AFh (175d), X = 175 [32] = 15. • The firmware • The DFU Suffix on 16 Bytes. Table 4-7. DFU File Suffix bmRequestType bRequest wValue wIndex wLength Data 1010 0001b DFU_GETSTATE (5) Zero Interface (4) 1 State bmRequestType bRequest wValue wIndex wLength Data 1010 0001b DFU_ABORT (6) Zero Interface (4) 0 None Offset Field Size Value Description -0 dwCRC 4 Number The CRC of the entire file, excluding dwCRC -4 bLength 1 16 The length of this DFU suffix including dwCRC -5 ucDfuSignature 3 5 : 44h 6 : 46h 7 : 55h The unique DFU signature field -8 bcdDFU 2 BCD 0100h DFU specification number |
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