Component: I2C Slave (Comms: Interface): Difference between revisions

Latest revision as of 14:37, 13 July 2026

Author	Matrix Ltd.
Version	1.3
Category	Comms: Interface

I2C Slave component

Generic Two Wire I2C Communications Interface

Component Source Code

Please click here to download the component source project: FC_Comp_Source_I2C_Slave.fcfx

Please click here to view the component source code (Beta): FC_Comp_Source_I2C_Slave.fcfx

Detailed description

No detailed description exists yet for this component

Examples

No additional examples

Macro reference

Check_Status

	Check_Status
Returns the Slave Status. Bit 0 = 1 Indicates address/data byte available in the buffer to read Bit 5 = 1 Indicates that the last byte received or transmitted was data (else address)
- BYTE	Return

Initialise

	Initialise
Enables the I²C hardware and performs some initialization. Should be called at the start of the program or at least before any of the other I²C functions are called.
- VOID	Return

ReceiveByte

	ReceiveByte
Receives a byte from the I²C bus. Returns the data received, and sends either Ack or Nak Set parameter Last as: 1=Last=Nak, 0=Ack=More
- BYTE	Last
Used to signify the last byte when streaming incoming data. 0=Not last byte, 1=Last Byte
- BYTE	Return

TransmitByte

	TransmitByte
Sends a byte on the I²C bus. Returns the acknowledge if any. 0 represents that data was acknowledged and 1 represents no acknowledge was detected.
- BYTE	Data
Data byte to send on the I²C bus.
- BYTE	Return

Property reference

	Properties
	Bus Settings
	Channel
Channel selection
	Baud Select
Baud rate option selector
	Baud Rate
Baud rate to be used
	Stop Delay
On older microcontroller devices there is a potential for the I2C hardware channel to lock up if there is not a 10ms delay between an I2C stop event and the next I2C start event. Most modern microcontrollers will not have a problem so this property can be disabled to speed up the I2C communications.
	Slave Setttings
	Slave Address

	Mask
0 - don't care; 1 - perform match; So address of 0x30 and mask of 0xF0 will allow the slave to respond to addresses of 0x30, 0x31, 0x32, …, 0x3F
	Connections
	SDA
Pin used for SDA (data signal)
	SCL
Pin used for SCL (clock signal)
	Simulation
	Label
Label shown on the comms flasher on the simulation panel.
	Scope Traces
Selects if the scope traces are automatically generated or not
	Console Data
Selects if the console data is automatically generated or not
	API

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-| width="10%" align="center" style="background-color:#EAE1EA;" | [[File:Fc9-conn-icon.png]]
+| width="10%" align="center" class="mtx-class-propfolder" | [[File:Fc9-conn-icon.png]]
 | width="90%" class="mtx-class-propfolder" | Bus Settings
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 | colspan="2" | On older microcontroller devices there is a potential for the I2C hardware channel to lock up if there is not  a 10ms delay between an I2C stop event and the next I2C start event.  Most modern microcontrollers will not have a problem so this property can be disabled to speed up the  I2C communications. &nbsp;
 |-
-| width="10%" align="center" style="background-color:#EAE1EA;" | [[File:Fc9-conn-icon.png]]
+| width="10%" align="center" class="mtx-class-propfolder" | [[File:Fc9-conn-icon.png]]
 | width="90%" class="mtx-class-propfolder" | Slave Setttings
 |-
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 | colspan="2" | 0 - don't care; 1 - perform match; So address of 0x30 and mask of 0xF0 will allow the slave to respond to addresses of 0x30, 0x31, 0x32, …, 0x3F&nbsp;
 |-
-| width="10%" align="center" style="background-color:#EAE1EA;" | [[File:Fc9-conn-icon.png]]
+| width="10%" align="center" class="mtx-class-propfolder" | [[File:Fc9-conn-icon.png]]
 | width="90%" class="mtx-class-propfolder" | Connections
 |-
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 | colspan="2" | Pin used for SCL (clock signal)&nbsp;
 |-
-| width="10%" align="center" style="background-color:#EAE1EA;" | [[File:Fc9-conn-icon.png]]
+| width="10%" align="center" class="mtx-class-propfolder" | [[File:Fc9-conn-icon.png]]
 | width="90%" class="mtx-class-propfolder" | Simulation
 |-

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