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<HTML
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><HEAD
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><TITLE
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>NEC uPD985xx USB Device Driver</TITLE
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WIDTH="100%"></DIV
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><H1
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><A
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NAME="DEVS-USB-NEC-UPD985XX">NEC uPD985xx USB Device Driver</H1
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><DIV
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CLASS="REFNAMEDIV"
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><A
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NAME="AEN18819"
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></A
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><H2
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>Name</H2
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>NEC uPD985xx USB Support -- Device driver for the on-chip NEC uPD985xx USB device</DIV
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><DIV
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CLASS="REFSECT1"
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><A
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NAME="AEN18822"
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></A
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><H2
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>NEC uPD985xx USB Hardware</H2
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><P
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>The NEC uPD985xx family of processors is supplied with an on-chip USB
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slave device, the UDC (USB Device Controller). This supports seven
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endpoints. Endpoint 0 can only be used for control messages. Endpoints
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1 and 2 are for isochronous transmits and receives respectively.
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Endpoints 3 and 4 support bulk transmits and receives. Endpoints 5 and
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6 normally support interrupt transmits and receives, but endpoint 5 can
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also be configured to support bulk transmits. At this time only the
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control endpoint 0, the bulk endpoints 3 and 4, and the interrupt
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endpoint 5 are supported.</P
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></DIV
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><DIV
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CLASS="REFSECT1"
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><A
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NAME="AEN18825"
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></A
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><H2
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>Endpoint Data Structures</H2
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><P
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>The uPD985xx USB device driver can provide up to four data structures
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corresponding to the four supported endpoints: a
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<SPAN
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CLASS="STRUCTNAME"
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>usbs_control_endpoint</SPAN
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> structure
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<TT
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CLASS="VARNAME"
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>usbs_upd985xx_ep0</TT
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>;
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<SPAN
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CLASS="STRUCTNAME"
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>usbs_tx_endpoint</SPAN
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> structures
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<TT
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CLASS="VARNAME"
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>usbs_upd985xx_ep3</TT
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> and
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<TT
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CLASS="VARNAME"
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>usbs_upd985xx_ep5</TT
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>; and a
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<SPAN
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CLASS="STRUCTNAME"
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>usbs_rx_endpoint</SPAN
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>
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<TT
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CLASS="VARNAME"
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>usbs_upd985xx_ep4</TT
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>. The header file
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<TT
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CLASS="FILENAME"
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>cyg/io/usb/usbs_nec_upd985xx.h</TT
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>
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provides declarations for these.</P
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><P
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>Not all applications will require support for all the endpoints. For
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example, if the intended use of the UDC only involves peripheral to
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host transfers then <TT
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CLASS="LITERAL"
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>usbs_upd985xx_ep4</TT
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> is redundant.
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The device driver provides configuration options to control the
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presence of each endpoint:</P
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><P
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></P
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><OL
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TYPE="1"
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><LI
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><P
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>Endpoint 0 is controlled by
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<TT
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CLASS="LITERAL"
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>CYGFUN_DEVS_USB_UPD985XX_EP0</TT
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>. This defaults to
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enabled if there are any higher-level packages that require USB
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hardware or if the global preference
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<TT
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CLASS="LITERAL"
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>CYGGLO_IO_USB_SLAVE_APPLICATION</TT
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> is enabled,
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otherwise it is disabled. Usually this has the desired effect. It may
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be necessary to override this in special circumstances, for example if
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the target board uses an external USB chip in preference to the UDC
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and it is that external chip's device driver that should be used
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rather than the on-chip UDC. It is not possible to disable endpoint 0
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and at the same time enable one or both of the other endpoints, since
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a USB device is only usable if it can process the standard control
|
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messages.</P
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></LI
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><LI
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><P
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>Endpoint 3 is controlled by
|
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<TT
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CLASS="LITERAL"
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>CYGPKG_DEVS_USB_UPD985XX_EP3</TT
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>. By default this
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endpoint is disabled: according to NEC erratum U3 there may be
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problems when attempting bulk transfers of 192 bytes or greater. As an
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alternative the device driver provides support for endpoint 5,
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configured to allow bulk transfers. Endpoint 3 can be enabled if the
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application only requires bulk transfers of less than 192 bytes, or if
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this erratum is not applicable to the system being developed for other
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reasons.</P
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></LI
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| 202 |
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><LI
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| 203 |
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><P
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| 204 |
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>Endpoint 4 is controlled by
|
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<TT
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CLASS="LITERAL"
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|
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>CYGPKG_DEVS_USB_UPD985XX_EP4</TT
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>. This is enabled by
|
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default whenever endpoint 0 is enabled, but it can be disabled
|
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manually.</P
|
| 211 |
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></LI
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| 212 |
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><LI
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| 213 |
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><P
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| 214 |
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>Endpoint 5 is controlled by
|
| 215 |
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<TT
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| 216 |
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CLASS="LITERAL"
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>CYGPKG_DEVS_USB_UPD985XX_EP5</TT
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| 218 |
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>. This is enabled by
|
| 219 |
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default whenever endpoint 0 is enabled, but it can be disabled
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manually. There is also a configuration option
|
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<TT
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| 222 |
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CLASS="LITERAL"
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| 223 |
|
|
>CYGIMP_DEVS_USB_UPD985XX_EP5_BULK</TT
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| 224 |
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>, enabled by
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default. This option allows the endpoint to be used for bulk
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transfers rather than interrupt transfers.</P
|
| 227 |
|
|
></LI
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| 228 |
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></OL
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| 229 |
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><P
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| 230 |
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>The uPD985xx USB device driver implements the interface specified by the
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common eCos USB Slave Support package. The documentation for that
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package should be consulted for further details. </P
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| 233 |
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><P
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>The device driver assumes a bulk packet size of 64 bytes, so this
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value should be used in the endpoint descriptors in the enumeration
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data provided by application code. The device driver also assumes
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a control packet size of eight bytes, and again this should be
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reflected in the enumeration data. If endpoint 5 is configured for
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interrupt rather than bulk transfers then the maximum packet size is
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| 240 |
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limited to 64 bytes by the USB standard.</P
|
| 241 |
|
|
></DIV
|
| 242 |
|
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><DIV
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| 243 |
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|
CLASS="REFSECT1"
|
| 244 |
|
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><A
|
| 245 |
|
|
NAME="AEN18855"
|
| 246 |
|
|
></A
|
| 247 |
|
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><H2
|
| 248 |
|
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>Devtab Entries</H2
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| 249 |
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><P
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| 250 |
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>In addition to the endpoint data structures the uPD985xx USB device
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| 251 |
|
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driver can also provide devtab entries for each endpoint. This allows
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| 252 |
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higher-level code to use traditional I/O operations such as
|
| 253 |
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<TT
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| 254 |
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|
CLASS="FUNCTION"
|
| 255 |
|
|
>open</TT
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| 256 |
|
|
>/<TT
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| 257 |
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CLASS="FUNCTION"
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| 258 |
|
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>read</TT
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| 259 |
|
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>/<TT
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| 260 |
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CLASS="FUNCTION"
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| 261 |
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>write</TT
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| 262 |
|
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>
|
| 263 |
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rather than the USB-specific non-blocking functions like
|
| 264 |
|
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<TT
|
| 265 |
|
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CLASS="FUNCTION"
|
| 266 |
|
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>usbs_start_rx_buffer</TT
|
| 267 |
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|
>. These devtab entries are
|
| 268 |
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optional since they are not always required. The relevant
|
| 269 |
|
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configuration options are
|
| 270 |
|
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<TT
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| 271 |
|
|
CLASS="LITERAL"
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| 272 |
|
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>CYGVAR_DEVS_USB_UPD985XX_EP0_DEVTAB_ENTRY</TT
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| 273 |
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>,
|
| 274 |
|
|
<TT
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| 275 |
|
|
CLASS="LITERAL"
|
| 276 |
|
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>CYGVAR_DEVS_USB_UPD985XX_EP3_DEVTAB_ENTRY</TT
|
| 277 |
|
|
>,
|
| 278 |
|
|
<TT
|
| 279 |
|
|
CLASS="LITERAL"
|
| 280 |
|
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>CYGVAR_DEVS_USB_UPD985XX_EP4_DEVTAB_ENTRY</TT
|
| 281 |
|
|
>, and
|
| 282 |
|
|
<TT
|
| 283 |
|
|
CLASS="LITERAL"
|
| 284 |
|
|
>CYGVAR_DEVS_USB_UPD985XX_EP5_DEVTAB_ENTRY</TT
|
| 285 |
|
|
>. By
|
| 286 |
|
|
default these devtab entries are provided if the global preference
|
| 287 |
|
|
<TT
|
| 288 |
|
|
CLASS="LITERAL"
|
| 289 |
|
|
>CYGGLO_USB_SLAVE_PROVIDE_DEVTAB_ENTRIES</TT
|
| 290 |
|
|
> is enabled,
|
| 291 |
|
|
which is usually the case. Obviously a devtab entry for a given
|
| 292 |
|
|
endpoint will only be provided if the underlying endpoint is enabled.
|
| 293 |
|
|
For example, there will not be a devtab entry for endpoint 4 if
|
| 294 |
|
|
<TT
|
| 295 |
|
|
CLASS="LITERAL"
|
| 296 |
|
|
>CYGPKG_DEVS_USB_UPD985XX_EP4</TT
|
| 297 |
|
|
> is disabled.</P
|
| 298 |
|
|
><P
|
| 299 |
|
|
>The names for the devtab entries are determined by using a
|
| 300 |
|
|
configurable base name and appending <TT
|
| 301 |
|
|
CLASS="LITERAL"
|
| 302 |
|
|
>0c</TT
|
| 303 |
|
|
>,
|
| 304 |
|
|
<TT
|
| 305 |
|
|
CLASS="LITERAL"
|
| 306 |
|
|
>3w</TT
|
| 307 |
|
|
>, <TT
|
| 308 |
|
|
CLASS="LITERAL"
|
| 309 |
|
|
>4r</TT
|
| 310 |
|
|
> or <TT
|
| 311 |
|
|
CLASS="LITERAL"
|
| 312 |
|
|
>5w</TT
|
| 313 |
|
|
>.
|
| 314 |
|
|
The base name is determined by the configuration option
|
| 315 |
|
|
<TT
|
| 316 |
|
|
CLASS="LITERAL"
|
| 317 |
|
|
>CYGDAT_DEVS_USB_UPD985XX_DEVTAB_BASENAME</TT
|
| 318 |
|
|
> and has a
|
| 319 |
|
|
default value of <TT
|
| 320 |
|
|
CLASS="LITERAL"
|
| 321 |
|
|
>/dev/usbs</TT
|
| 322 |
|
|
>, so the devtab entry for
|
| 323 |
|
|
endpoint 4 would default to <TT
|
| 324 |
|
|
CLASS="LITERAL"
|
| 325 |
|
|
>/dev/usbs4r</TT
|
| 326 |
|
|
>. If the
|
| 327 |
|
|
target hardware involves multiple USB devices then application
|
| 328 |
|
|
developers may have to change the base name to prevent a name clash
|
| 329 |
|
|
with other USB device drivers.</P
|
| 330 |
|
|
></DIV
|
| 331 |
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><DIV
|
| 332 |
|
|
CLASS="REFSECT1"
|
| 333 |
|
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><A
|
| 334 |
|
|
NAME="AEN18876"
|
| 335 |
|
|
></A
|
| 336 |
|
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><H2
|
| 337 |
|
|
>Restrictions</H2
|
| 338 |
|
|
><P
|
| 339 |
|
|
>The current device driver imposes a restriction on certain bulk
|
| 340 |
|
|
receives on endpoint 4. If the protocol being used involves
|
| 341 |
|
|
variable-length transfers, in other words if the host is allowed to
|
| 342 |
|
|
send less data than a maximum-sized transfer, then the buffer passed
|
| 343 |
|
|
to the device driver for receives must be aligned to a 16-byte
|
| 344 |
|
|
cacheline boundary and it must be a multiple of this 16-byte cacheline
|
| 345 |
|
|
size. This restriction does not apply if the protocol only involves
|
| 346 |
|
|
fixed-size transfers.</P
|
| 347 |
|
|
></DIV
|
| 348 |
|
|
><DIV
|
| 349 |
|
|
CLASS="REFSECT1"
|
| 350 |
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><A
|
| 351 |
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NAME="AEN18879"
|
| 352 |
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></A
|
| 353 |
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|
><H2
|
| 354 |
|
|
>Optional Hardware Workarounds</H2
|
| 355 |
|
|
><P
|
| 356 |
|
|
>The NEC errata list a number of other problems that affect the USB
|
| 357 |
|
|
device driver. The device driver contains workarounds for these, which
|
| 358 |
|
|
are enabled by default but can be disabled if the application
|
| 359 |
|
|
developer knows that the errata are not relevant to the system being
|
| 360 |
|
|
developed.</P
|
| 361 |
|
|
><P
|
| 362 |
|
|
>Erratum S1 lists a possible problem if the device driver attempts
|
| 363 |
|
|
multiple writes to the USB hardware. This is circumvented by a
|
| 364 |
|
|
dummy read operation after every write. If the workaround is not
|
| 365 |
|
|
required then the configuration option
|
| 366 |
|
|
<TT
|
| 367 |
|
|
CLASS="LITERAL"
|
| 368 |
|
|
>CYGIMP_DEVS_USB_UPD985XX_IBUS_WRITE_LIMIT</TT
|
| 369 |
|
|
> can be disabled.</P
|
| 370 |
|
|
><P
|
| 371 |
|
|
>Errata U3 and U4 describe various problems related to concurrent
|
| 372 |
|
|
transmissions on different endpoints. By default the device driver
|
| 373 |
|
|
works around this by serializing all transmit operations. For example
|
| 374 |
|
|
if the device driver needs to send a response to a control message on
|
| 375 |
|
|
endpoint 0 while there is an ongoing bulk transfer on endpoint 5, the
|
| 376 |
|
|
response is delayed until the bulk transfer has completed. Under
|
| 377 |
|
|
typical operating conditions this does not cause any problems:
|
| 378 |
|
|
endpoint 0 traffic usually happens only during initialization, when
|
| 379 |
|
|
the target is connected to the host, while endpoint 5 traffic only
|
| 380 |
|
|
happens after initialization. However if transmit serialization is
|
| 381 |
|
|
inappropriate for the system being developed then it can be disabled
|
| 382 |
|
|
using the configuration option
|
| 383 |
|
|
<TT
|
| 384 |
|
|
CLASS="LITERAL"
|
| 385 |
|
|
>CYGIMP_DEVS_USB_UPD985XX_SERIALIZE_TRANSMITS</TT
|
| 386 |
|
|
>. </P
|
| 387 |
|
|
></DIV
|
| 388 |
|
|
><DIV
|
| 389 |
|
|
CLASS="REFSECT1"
|
| 390 |
|
|
><A
|
| 391 |
|
|
NAME="AEN18886"
|
| 392 |
|
|
></A
|
| 393 |
|
|
><H2
|
| 394 |
|
|
>Platform Dependencies</H2
|
| 395 |
|
|
><P
|
| 396 |
|
|
>On some platforms it is necessary for the low-level USB device driver
|
| 397 |
|
|
to perform some additional operations during start-up. For example it
|
| 398 |
|
|
may be necessary to manipulate one of the processor's GPIO lines
|
| 399 |
|
|
before the host can detect a new USB peripheral and attempt to
|
| 400 |
|
|
communicate with it. This avoids problems if the target involves a
|
| 401 |
|
|
significant amount of work prior to device driver initialization, for
|
| 402 |
|
|
example a power-on self-test sequence. If the USB host attempted to
|
| 403 |
|
|
contact the target before the USB device driver had been initialized,
|
| 404 |
|
|
it would fail to get the expected responses and conclude that the
|
| 405 |
|
|
target was not a functional USB peripheral.</P
|
| 406 |
|
|
><P
|
| 407 |
|
|
>Platform-specific initialization code can be provided via a macro
|
| 408 |
|
|
<TT
|
| 409 |
|
|
CLASS="FUNCTION"
|
| 410 |
|
|
>UPD985XX_USB_PLATFORM_INIT</TT
|
| 411 |
|
|
>. Typically this macro
|
| 412 |
|
|
would be defined in the platform HAL's header file
|
| 413 |
|
|
<TT
|
| 414 |
|
|
CLASS="FILENAME"
|
| 415 |
|
|
>cyg/hal/plf_io.h</TT
|
| 416 |
|
|
>. If the
|
| 417 |
|
|
current platform defines such a macro, the USB device driver will
|
| 418 |
|
|
invoke it during the endpoint 0 start-up operation.</P
|
| 419 |
|
|
></DIV
|
| 420 |
|
|
><DIV
|
| 421 |
|
|
CLASS="NAVFOOTER"
|
| 422 |
|
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|
| 429 |
|
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|
| 430 |
|
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|
| 431 |
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><TD
|
| 432 |
|
|
WIDTH="33%"
|
| 433 |
|
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ALIGN="left"
|
| 434 |
|
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VALIGN="top"
|
| 435 |
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><A
|
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HREF="devs-usb-nec-upd985xx-ref.html"
|
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ACCESSKEY="P"
|
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>Prev</A
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WIDTH="34%"
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| 442 |
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ALIGN="center"
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VALIGN="top"
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HREF="ecos-ref.html"
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>Home</A
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VALIGN="top"
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>NEC uPD985xx USB Device Driver</TD
|
| 465 |
|
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><TD
|
| 466 |
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WIDTH="34%"
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| 467 |
|
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ALIGN="center"
|
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ALIGN="right"
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| 477 |
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VALIGN="top"
|
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>Synthetic Target Ethernet Driver</TD
|
| 479 |
|
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|
| 480 |
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|
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|
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