Renesas SH7286 Informazioni Techniche Scaricare il pdf (Pagina 20)

1. The “Toggle LED” button enables a LED on the RSK to be toggled on and off.

2. The “Read ADC” button will command the RSK to read its ADC and return the value back to the host where it will be

displayed.

3. The “Set LCD” button allows the text of the LCD on the RSK to be changed.

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 SH7286 Informazioni Techniche Pagina 20