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USB-TO-GPIO Datenblatt(PDF) 14 Page - Texas Instruments

Teilenummer USB-TO-GPIO
Bauteilbeschribung  USB Interface Adapter Evaluation Module
PDF  50 Pages
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Hersteller  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
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USB-TO-GPIO Datenblatt(HTML) 14 Page - Texas Instruments

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3.3
I2C Write Command and Response
3.4
I2C Read Command and Response
I2C Write Command and Response
USB PACKET
COMMAND
BYTE 0
USB PACKET USB PACKET
USB PACKET USB PACKET USB PACKET
USB PACKET
COMMENTS
DESCRIPTION
COMMAND
BYTE 1
BYTE 2
BYTE 3
BYTE 4
BYTE 5
BYTES 6–63
CODE
C number of bytes (from 1 up to 60 bytes) to
0x14
A
B
C
I2C Write
write
USB PACKET
COMMAND
BYTE 0
USB PACKET USB PACKET
USB PACKET USB PACKET USB PACKET
USB PACKET
COMMENTS
DESCRIPTION
COMMAND
BYTE 1
BYTE 2
BYTE 3
BYTE 4
BYTE 5
BYTES 6–63
CODE
Response from
Success: 0
0x94
Fail: 1
I2C Write
The following describes the detailed bit banking of this command: I2C Start
→ write A (= slave address
shifted left by 1 bit + write bit of 0)
→ slave ACK → write B (which is usually either a command
byte or a register address byte)
→ slave ACK → repeat (write 1 byte → slave ACK) for C number of
times
→ I2C stop. There is another more generic I2C Write transaction command in Section 3.10.
USB PACKET
COMMAND
BYTE 0
USB PACKET USB PACKET
USB PACKET USB PACKET USB PACKET
USB PACKET
COMMENTS
DESCRIPTION
COMMAND
BYTE 1
BYTE 2
BYTE 3
BYTE 4
BYTE 5
BYTES 6–63
CODE
D (from 1 to
0x15
A
B
C
I2C Read
62 bytes)
USB PACKET
COMMAND
BYTE 0
USB PACKET USB PACKET
USB PACKET USB PACKET USB PACKET
USB PACKET
COMMENTS
DESCRIPTION
COMMAND
BYTE 1
BYTE 2
BYTE 3
BYTE 4
BYTE 5
BYTES 6–63
CODE
Response from
Success: 0
0x95
D number of bytes read
Fail: 1
I2C Read
The following describes the detailed bit banking of this command: I2C start
→ write A (= slave address
shifted left by 1 bit + write bit of 0)
→ slave ACK → write B (which is usually either a command
byte or a register address byte)
→ slave ACK → repeated start → write C (= slave address shifted
left by 1 bit + read bit of 1)
→ slave ACK → read D number of bytes (with master ACKs in between)
from a slave
→ master NACK → I2C stop. There is another more generic I2C Read transaction
command in Section 3.11.
Firmware Programming and Communications Protocol
14
SLLU093 – August 2006
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