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Os motores de busca de Datasheet de Componentes eletrônicos |
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Os motores de busca de Datasheet de Componentes eletrônicos |
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AT89C5132-ROTIL Folha de dados(PDF) 12 Page - ATMEL Corporation |
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AT89C5132-ROTIL Folha de dados(HTML) 12 Page - ATMEL Corporation |
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12 / 33 page  12 4256B–USB–03/06 AT89C5132 Protocol Device Firmware Upgrade Introduction Device Firmware Upgrade is the mechanism for accomplishing the task of upgrading the device firmware. Any class of USB device can exploit this capability by supporting the requirements specified in this document. Because it is impractical for a device to concurrently perform both DFU operations and its nor- mal run-time activities, those normal activities must cease for the duration of the DFU operations. Doing so means that the device must change its operating mode; i.e., a printer is not a printer while it is undergoing a firmware upgrade; it is a PROM programmer. However, a device that supports DFU is not capable of changing its mode of operation on its own. External (human or host operating system) intervention is required. DFU Specific Requests In addition of the USB standard requests, 7 DFU class-specific requests are employed to accomplish the upgrade operations, see Figure 4. DFU Descriptors Set The device exports the DFU descriptor set, which contains: • A DFU device descriptor • A single configuration descriptor • A single interface descriptor (including descriptors for alternate settings, if present) • A single functional descriptor DFU Device Descriptor This descriptor is only present in the DFU mode descriptor set. The DFU class code is reported in the bDeviceClass field of this descriptor. Table 9. USB Parameters Table 8. DFU Class-specific Requests bmRequestType bRequest wValue wIndex wLength Data 0010 0001b DFU_DETACH (0) wTimeout Interface (4) Zero none 0010 0001b DFU_DNLOAD (1) wBlock Interface (4) Length Firmware 1010 0001b DFU_UPLOAD (2) wBlock Interface (4) Length Firmware 1010 0001b DFU_GETSTATUS (3) Zero Interface (4) 6 Status 0010 0001b DFU_CLRSTATUS (4) Zero Interface (4) Zero none 1010 0001b DFU_GETSTATE (5) Zero Interface (4) 1 State 0010 0001b DFU_ABORT (6) Zero Interface (4) Zero none Parameter ATMEL – AT89C5132 Bootloader Vendor ID 0x03EB Product ID 0x2FFF Release Number 0x0000 |
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