UM10462 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2016. All rights reserved.
User manual Rev. 5.5 — 21 December 2016 199 of 523
NXP Semiconductors
UM10462
Chapter 10: LPC11U3x/2x/1x USB on-chip drivers
wTransferSize
uint16_t USBD_DFU_INIT_PARAM::wTransferSize
DFU transfer block size in number of bytes. This value should match the value set in DFU descriptor
provided as part of the descriptor array (
pad
uint16_t USBD_DFU_INIT_PARAM::pad
intf_desc
uint8_t * USBD_DFU_INIT_PARAM::intf_desc
Pointer to the DFU interface descriptor within the descriptor array (
DFU_Write
uint8_t(*uint8_t(* USBD_DFU_INIT_PARAM::DFU_Write)(uint32_t block_num, uint8_t **src, uint32_t length, uint8_t
*bwPollTimeout))(uint32_t block_num, uint8_t **src, uint32_t length, uint8_t *bwPollTimeout)
DFU Write callback function.
This function is provided by the application software. This function gets called when host sends a write
command. For application using zero-copy buffer scheme this function is called for the first time with
Parameters:
1. block_num = Destination start address.
2. src = Pointer to a pointer to the source of data. Pointer-to-pointer is used to implement zero-copy
buffers. See Zero-Copy Data Transfer model for more details on zero-copy concept.
3. bwPollTimeout = Pointer to a 3 byte buffer which the callback implementer should fill with the
amount of minimum time, in milliseconds, that the host should wait before sending a subsequent
DFU_GETSTATUS request.
4. length = Number of bytes to be written.
Returns:
Returns DFU_STATUS_ values defined in mw_usbd_dfu.h.
DFU_Read
uint32_t(*uint32_t(* USBD_DFU_INIT_PARAM::DFU_Read)(uint32_t block_num, uint8_t **dst, uint32_t length))(uint32_t
block_num, uint8_t **dst, uint32_t length)
DFU Read callback function.
This function is provided by the application software. This function gets called when host sends a read
command.
Parameters:
1. block_num = Destination start address.
2. dst = Pointer to a pointer to the source of data. Pointer-to-pointer is used to implement zero-copy
buffers. See Zero-Copy Data Transfer model for more details on zero-copy concept.
3. length = Amount of data copied to destination buffer.
Returns:
Returns DFU_STATUS_ values defined in mw_usbd_dfu.h.
DFU_Done
void(*USBD_DFU_INIT_PARAM::DFU_Done)(void)
DFU done callback function.
This function is provided by the application software. This function gets called after download is
finished.
Nothing.
Returns:
Nothing.
Table 205. USBD_DFU_INIT_PARAM class structure
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