I2C Master Read/ Write

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I2C Master Read/ Write

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User Interface

How this block appears in a Simulink model?


What can be configured?


Configuration item

Selectable option/ Value


I2C Module

1 | 2 | 3

Select I2C module for Read/ Write transaction.

Bytes write count

(Positive number)

Specify number of bytes to write to I2C in a transaction. This number including command bytes but not include slave address.

Bytes read count

(Positive number)

Specify number of bytes to read from I2C in a transaction.

Wait write time (ms)

(Positive number)

This delay time is optional, can be used for add some delay after write a value to I2C before process next transaction.

Warning: this wait time is blocking delay, it may slow down overall process.

Generate STOP before Re-START for READ

Checked | Unchecked

Optional, for device which not support random read format.

Sample time (sec)

-1 (Inherited) or specify.

Specify sample time for this block.

Input port

1. SlvAddr, input the device address in left justify format (shift 7 bit address 1 bit to left).

2. Data to write to I2C.

Output port

1. Status, indicate status of I2C transaction.

 1.1 Status 0 indicates success,

 1.2 Status 1 - NAK. Slave device did not acknowledge, mostly can be from Address not match or Slave not connected.

 1.3 Status 2- TIMEOUT. Communication timeout, mostly from I2C bus is low longer than timeout setting. Since I2C port is open drain, missing Pull-up resister can cause I2C bus low.

2. Data reading from device, valid only when Status is success.