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TSW-102-07-L-D Datasheet(PDF) 53 Page - Texas Instruments |
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TSW-102-07-L-D Datasheet(HTML) 53 Page - Texas Instruments |
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53 / 60 page  www.ti.com Appendix G USB-MODEVM Protocol G.1 USB-MODEVM Protocol Appendix G The USB-MODEVM is defined to be a Vendor-Specific class, and is identified on the PC system as an NI-VISA device. Because the TAS1020 has several routines in its ROM which are designed for use with HID-class devices, HID-like structures are used, even though the USB-MODEVM is not an HID-class device. Data is passed from the PC to the TAS1020 using the control endpoint. Data is sent in an HIDSETREPORT (see Table G-1): Table G-1. USB Control Endpoint HIDSETREPORT Request Part Value Description bmRequestType 0x21 00100001 bRequest 0x09 SET_REPORT wValue 0x00 don't care wIndex 0x03 HID interface is index 3 wLength calculated by host Data Data packet as described below The data packet consists of the following bytes, shown in Table G-2: Table G-2. Data Packet Configuration BYTE NUMBER TYPE DESCRIPTION 0 Interface Specifies serial interface and operation. The two values are logically ORed. Operation: READ 0x00 WRITE 0x10 Interface: GPIO 0x08 SPI_16 0x04 I2C_FAST 0x02 I2C_STD 0x01 SPI_8 0x00 1 I2C Slave Slave address of I2C device or MSB of 16-bit reg addr for SPI Address 2 Length Length of data to write/read (number of bytes) 3 Register address Address of register for I2C or 8-bit SPI; LSB of 16-bit address for SPI 4..64 Data Up to 60 data bytes could be written at a time. EP0 maximum length is 64. The return packet is limited to 42 bytes, so advise only sending 32 bytes at any one time. Example usage: Write two bytes (AA, 55) to device starting at register 5 of an I2C device with address A0: [0] 0x11 [1] 0xA0 [2] 0x02 [3] 0x05 [4] 0xAA [5] 0x55 SLAU218 – August 2007 USB-MODEVM Protocol 49 Submit Documentation Feedback |
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