Renesas CPU Board M3A-HS19 Manuel d'utilisateur télécharger pdf (Page 22)

SH7285/SH7286 USB Function Module

USB to Serial Conversion Application Note

Table 3.1 Specifications

Features Description

Detect a connection to the USB host After the hardware detects a connection, the port pulls up the D+ pin.

Control transfer

(USB standard request)

• Decode requests, processes the Data stage and Status stage of

the USB request transmitted from the USB host in the control

transfer.

• Sends the descriptor information shown in

Figure 3.2 through

Figure 3.4 to Get Descriptor command to connect with the USB

host PC as a USB communication class.

• Descriptor samples to send to the USB host are shown in the

SetUsbInfo.h file.

Figure 3.2 shows the device descriptor sample,

Figure 3.3 and Figure 3.4 shows the configuration descriptor

samples.

Table 3.2 lists Vendor ID and Product ID of the sample.

Control transfer

(USB communication class request)

Executes the following USB communication class commands:

Get Line Coding, Set Line Coding, Set Control Line State, and Send

Break

Bulk IN/OUT transfer Executes the bulk IN/OUT transfer.

Serial/USB communication

conversion

(1) Sends the received data from the USB host in bulk OUT transfer

to the serial device by serial OUT communication.

(2) Sends the received data from the serial device by serial IN

communication to the USB host in bulk IN transfer.

Figure 3.2 Device Descriptor Sample

Note:

Table 3.2 lists the default value of the vendor ID and product ID in the device descriptor sample. These values MUST

be changed when applied to the user system.

Table 3.2 Vendor ID and Product ID Sample

ID Value Description

Vendor ID 0x045B Renesas Technology

Product ID 0x0020 Renesas SH7285 Serial-USB

/* Descriptor Information */

/* Device Descriptor */

unsigned char DeviceItem[] = {

0x12,0x01,0x10,0x01,

0x02, /* Communication Class */

0x00,0x00,0x08,

0x5B, /* Vendor = Renesas Technology */

0x04, /* ""Attention"" Please use your company Vendor ID */

0x20, /* Product ID 0x0020 */

0x00,0x00,0x01,0x00,0x00,

0x03, /* Strings Descriptor iSerialNumber */

0x01

};

DeviceType deviceDiscriptorGVar[] = {

{18,DeviceItem}

};

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Renesas CPU Board M3A-HS19 Manuel d'utilisateur Page 22

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