Renesas Single-Chip Microcomputer M38C89T-ADF Informazioni Techniche Scaricare il pdf (Pagina 21)

To demonstrate that the RSK can also instigate communications you can press a switch on the RSK and this will be indicated back to the

host resulting in a message being displayed on the dialog.

This demonstrates that data can be sent successfully between the RSK and the PC. A fixed sized format of data has been chosen for all

messages, one for OUT and one for IN:

IN Message: (RSK to PC)

Byte 1

Bit 0 = LED status.

Bit 1 = ADC value valid indicator.

Bit 2 = Switch pressed indicator.

Byte 2-5 = 32 bit, little endian ADC Value.

OUT Message: (PC to RSK)

Byte 1

Bit 0 = LED toggle request.

Bit 1 = ADC read request.

Bit 2 = LCD set request.

Byte 2-17 = 16 ASCII Characters for LCD.

An IN message is sent whenever a switch on the RSK is pressed, an Interrupt IN transfer is used for this. An IN message is also sent in

response to certain OUT messages, a BULK IN transfer is used for this.

An OUT message is sent whenever a user clicks on one of the dialog buttons, a BULK OUT transfer is used for this.

The LibUSB application consists of the following files:-

Target:

libusb_app.c

libusb_app.h

usbdescriptors.c

Host:

\PC\RSK_LibUSB\...

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Renesas Single-Chip Microcomputer M38C89T-ADF Informazioni Techniche Pagina 21