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TSW-102-07-L-D Datasheet(PDF) 56 Page - Texas Instruments |
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TSW-102-07-L-D Datasheet(HTML) 56 Page - Texas Instruments |
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56 / 60 page  www.ti.com G.2 GPIO Capability G.3 Writing Scripts GPIO Capability The return packet should be [0] 0x21 [1] 0xA0 [2] 0x02 [3] 0x05 [4] 0xAA [5] 0x55 assuming that the values we wrote above starting at Register 5 were actually written to the device. The USB-MODEVM has seven GPIO lines. Access them by specifying the interface to be 0x08, and then using the standard format for packets—but addresses are unnecessary. The GPIO lines are mapped into one byte (see Table G-3): Table G-3. GPIO Pin Assignments Bit 7 6 5 4 3 2 1 0 x P3.5 P3.4 P3.3 P1.3 P1.2 P1.1 P1.0 Example: write P3.5 to a 1, set all others to 0: [0] 0x18 --> write, GPIO [1] 0x00 --> this value is ignored [2] 0x01 --> length - ALWAYS a 1 [3] 0x00 --> this value is ignored [4] 0x40 --> 01000000 The user may also read back from the GPIO to see the state of the pins. Let's say we just wrote the previous example to the port pins. Example: read the GPIO [0] 0x08 --> read, GPIO [1] 0x00 --> this value is ignored [2] 0x01 --> length - ALWAYS a 1 [3] 0x00 --> this value is ignored The return packet should be: [0] 0x28 [1] 0x00 [2] 0x01 [3] 0x00 [4] 0x40 A script is simply a text file that contains data to send to the serial control buses. The scripting language is quite simple, as is the parser for the language. Therefore, the program is not very forgiving about mistakes made in the source script file, but the formatting of the file is simple. Consequently, mistakes should be rare. 52 USB-MODEVM Protocol SLAU218 – August 2007 Submit Documentation Feedback |
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