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

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| width="20%" style="color: gray;" | Author
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| width="20%" style="color:gray;" | Author
 
| Matrix Ltd.
 
| Matrix Ltd.
 
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| width="20%" style="color: gray;" | Version
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| width="20%" style="color:gray;" | Version
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| 1.2 (Release)
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| 1.3
 
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| width="20%" style="color: gray;" | Category
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| width="20%" style="color:gray;" | Category
 
| Comms: Interface
 
| Comms: Interface
 
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|}
  
  
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==I2C Slave component==
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==[[File:Component Icon eac43fda_0bc5_4b08_881c_6d3e364f2eff.png|Image]] I2C Slave component==
 
 
Generic Two Wire I2C Communications Interface
 
Generic Two Wire I2C Communications Interface
  
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==Examples==
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==Component Source Code==
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===PIC16F1937 Examples===
 
  
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The slave device is connected to a bank of switches, the master device to a bank of LEDs. The value of the switches is passed to the master LEDs.
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Please click here to download the component source project: [https://www.flowcode.co.uk/wiki/componentsource/FC_Comp_Source_I2C_Slave.fcfx FC_Comp_Source_I2C_Slave.fcfx]
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{{Fcfile|1. I2C Master Read.fcfx|Master Read Example}}
 
  
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{{Fcfile|1. I2C Slave switches.fcfx|Slave Switches Example}}
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Please click here to view the component source code (Beta): [https://www.flowcode.co.uk/FlowchartView/?wfile=componentsource/FC_Comp_Source_I2C_Slave.fcfx FC_Comp_Source_I2C_Slave.fcfx]
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The slave device is connected to a bank of LEDs, the master device to a bank of switches. The value of the switches is passed to the slave LEDs.
 
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{{Fcfile|2. I2C Master Switches.fcfx|Master Send Example}}
 
  
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{{Fcfile|2. I2C Slave LEDs.fcfx|Slave LEDs Example}}
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==Detailed description==
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===Arduino Uno Examples===
 
  
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Example program showing how to use the I2C Slave on an AVR Arduino device.
 
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{{Fcfile|I2C Uno slave.fcfx|I2C Slave Arduino Uno Example}}
 
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===ECIO40P Examples===
 
  
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Example program showing how to use the I2C Slave on an ECIO40P device.
 
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{{Fcfile|ECIO40P_I2C_Master.fcfx|Master Example}}
 
  
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{{Fcfile|ECIO40P_I2C_Slave.fcfx|Slave Example}}
 
  
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==Downloadable macro reference==
 
  
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===<span style="font-weight: normal;"><u><tt>ReceiveByte</tt></u></span>===
 
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Receives a byte from the I²C bus.
 
  
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'''Parameters'''
 
  
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:[[Variable Types|BYTE]] ''Last''
 
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::Used to signify the last byte when streaming incoming data. 0=Not last byte, 1=Last Byte
 
  
  
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'''Return value'''
 
  
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:[[Variable Types|BYTE]]
 
  
  
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===<span style="font-weight: normal;"><u><tt>TransmitByte</tt></u></span>===
 
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Sends a byte on the I²C bus. Returns the acknowledge if any.
 
  
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0 represents that data was acknowledged and 1 represents no acknowledge was detected.
 
  
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'''Parameters'''
 
  
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:[[Variable Types|BYTE]] ''Data''
 
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::Data byte to send on the I²C bus.
 
  
  
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'''Return value'''
 
  
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:[[Variable Types|BYTE]]
 
  
  
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===<span style="font-weight: normal;"><u><tt>Initialise</tt></u></span>===
 
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Enables the I²C hardware and performs some initialization.
 
  
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Should be called at the start of the program or at least before any of the other I²C functions are called.
 
  
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'''Parameters'''
 
  
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:''This macro has no parameters''
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''No detailed description exists yet for this component''
  
 +
==Examples==
  
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'''Return value'''
 
  
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:''This call does not return a value''
 
  
  
  
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==Simulation macro reference==
 
  
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''This component does not contain any simulation macros''
 
  
  
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==Property reference==
 
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<span style="font-weight: normal;"><u>Channel</u></span>
 
  
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This property is of type ''Fixed list of ints'' and can be referenced with the variable name ''CHANNEL''.
 
  
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Specifies the I2C peripheral used by the component.
 
  
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Hardware channels are defined by the number of I2C peripherals available onboard your target microcontroller.
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''<span style="color:red;">No additional examples</span>''
  
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Software channels use standard I/O pins allowing you to connect the I2C bus to pretty much any pin.
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==Macro reference==
  
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<span style="font-weight: normal;"><u>Baud Select</u></span>
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===Check_Status===
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{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
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|-
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| width="10%" align="center" style="background-color:#D8C9D8;" align="center" | [[File:Fc9-comp-macro.png]]
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| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''Check_Status'''
 +
|-
 +
| colspan="2" | 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)&nbsp;
 +
|-
 +
|-
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| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:Fc9-u8-icon.png]] - BYTE
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| width="90%" style="border-top: 2px solid #000;" | ''Return''
 +
|}
  
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This property is of type ''Fixed list of ints'' and can be referenced with the variable name ''BAUD_LIST''.
 
  
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Sets the rate of the I2C clock which sets the maximum number of bits per second that can be sent or received.
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===Initialise===
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{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
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|-
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| width="10%" align="center" style="background-color:#D8C9D8;" align="center" | [[File:Fc9-comp-macro.png]]
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| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''Initialise'''
 +
|-
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| colspan="2" | 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.&nbsp;
 +
|-
 +
|-
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| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:Fc9-void-icon.png]] - VOID
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| width="90%" style="border-top: 2px solid #000;" | ''Return''
 +
|}
  
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<span style="font-weight: normal;"><u>Slew Rate Control</u></span>
 
  
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This property is of type ''Fixed list of ints'' and can be referenced with the variable name ''SRC''.
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===ReceiveByte===
 +
{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
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|-
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| width="10%" align="center" style="background-color:#D8C9D8;" align="center" | [[File:Fc9-comp-macro.png]]
 +
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''ReceiveByte'''
 +
|-
 +
| colspan="2" | 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&nbsp;
 +
|-
 +
|-
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| width="10%" align="center" | [[File:Fc9-u8-icon.png]] - BYTE
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| width="90%" | Last
 +
|-
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| colspan="2" | Used to signify the last byte when streaming incoming data. 0=Not last byte, 1=Last Byte&nbsp;
 +
|-
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| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:Fc9-u8-icon.png]] - BYTE
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| width="90%" style="border-top: 2px solid #000;" | ''Return''
 +
|}
  
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The slew rate control only works with hardware I2C channels but acts to modify the overall baud to ensure
 
  
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that signals are being transferred correctly based on how fast the control signals are able to rise and fall.
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===TransmitByte===
 +
{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
 +
|-
 +
| width="10%" align="center" style="background-color:#D8C9D8;" align="center" | [[File:Fc9-comp-macro.png]]
 +
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''TransmitByte'''
 +
|-
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| colspan="2" | 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.&nbsp;
 +
|-
 +
|-
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| width="10%" align="center" | [[File:Fc9-u8-icon.png]] - BYTE
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| width="90%" | Data
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|-
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| colspan="2" | Data byte to send on the I²C bus.&nbsp;
 +
|-
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| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:Fc9-u8-icon.png]] - BYTE
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| width="90%" style="border-top: 2px solid #000;" | ''Return''
 +
|}
  
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<span style="font-weight: normal;"><u>SMBus Inputs</u></span>
 
  
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This property is of type ''Fixed list of ints'' and can be referenced with the variable name ''SMB''.
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==Property reference==
  
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The SMBus Inputs only works with hardware I2C channels but acts to modify the I2C driver to be compatible with SM Bus.
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{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
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|-
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<span style="font-weight: normal;"><u>Data (SDA)</u></span>
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| width="10%" align="center" style="background-color:#D8C9D8;" | [[File:Fc9-prop-icon.png]]
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| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''Properties'''  
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This property is of type ''Single digital pin'' and can be referenced with the variable name ''SDA''.
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|-
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|-
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I2C data pin commonly referred to as SDA which represents serial data
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| width="10%" align="center" style="background-color:#EAE1EA;" | [[File:Fc9-conn-icon.png]]
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| width="90%" style="background-color:#EAE1EA; color:#4B008D;" | Bus Settings
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<span style="font-weight: normal;"><u>Clock (SCL)</u></span>
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|-
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|-
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This property is of type ''Single digital pin'' and can be referenced with the variable name ''SCL''.
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| width="10%" align="center" | [[File:Fc9-type-16-icon.png]]
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| width="90%" | Channel
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I2C clock pin commonly referred to as SCL which represents serial clock
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|-
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| colspan="2" | Channel selection&nbsp;
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<span style="font-weight: normal;"><u>Label</u></span>
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|-
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| width="10%" align="center" | [[File:Fc9-type-16-icon.png]]
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This property is of type ''Line of text'' and can be referenced with the variable name ''label''.
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| width="90%" | Baud Select
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|-
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Label shown on the comms flasher on the simulation panel.
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| colspan="2" | Baud rate option selector&nbsp;
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|-
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<span style="font-weight: normal;"><u>Injector</u></span>
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| width="10%" align="center" | [[File:Fc9-type-14-icon.png]]
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| width="90%" | Baud Rate
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This property is of type ''Fixed list of ints'' and can be referenced with the variable name ''Injector''.
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|-
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| colspan="2" | Baud rate to be used&nbsp;
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Lists all the available injector components on the panel to allow the I2C data to have meaning.
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|-
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| width="10%" align="center" | [[File:Fc9-type-7-icon.png]]
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Injectors are available to let you directly type in values, simulate devices and communicate between multiple instances of Flowcode.
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| width="90%" | Stop Delay
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|-
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<span style="font-weight: normal;"><u>Slave Address</u></span>
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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;
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+
|-
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This property is of type ''Signed integer'' and can be referenced with the variable name ''Slave_Address''.
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| width="10%" align="center" style="background-color:#EAE1EA;" | [[File:Fc9-conn-icon.png]]
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| width="90%" style="background-color:#EAE1EA; color:#4B008D;" | Slave Setttings
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''<span style="color:red;">No additional information</span>''
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|-
−
 
+
|-
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| width="10%" align="center" | [[File:Fc9-type-21-icon.png]]
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| width="90%" | Slave Address
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<span style="font-weight: normal;"><u>Mask</u></span>
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|-
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| colspan="2" | &nbsp;
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This property is of type ''Signed integer'' and can be referenced with the variable name ''Mask''.
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|-
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| width="10%" align="center" | [[File:Fc9-type-21-icon.png]]
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0 - don't care;
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| width="90%" | Mask
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|-
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1 - perform match;
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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;
−
 
+
|-
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So address of 0x30 and mask of 0xF0 will allow the slave to respond to addresses of 0x30, 0x31, 0x32, …, 0x3F
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| width="10%" align="center" style="background-color:#EAE1EA;" | [[File:Fc9-conn-icon.png]]
 +
| width="90%" style="background-color:#EAE1EA; color:#4B008D;" | Connections
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|-
 +
|-
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| width="10%" align="center" | [[File:Fc9-type-5-icon.png]]
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| width="90%" | SDA
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|-
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| colspan="2" | Pin used for SDA (data signal)&nbsp;
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|-
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| width="10%" align="center" | [[File:Fc9-type-5-icon.png]]
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| width="90%" | SCL
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|-
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| colspan="2" | Pin used for SCL (clock signal)&nbsp;
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|-
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| width="10%" align="center" style="background-color:#EAE1EA;" | [[File:Fc9-conn-icon.png]]
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| width="90%" style="background-color:#EAE1EA; color:#4B008D;" | Simulation
 +
|-
 +
|-
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| width="10%" align="center" | [[File:Fc9-type-10-icon.png]]
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| width="90%" | Label
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|-
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| colspan="2" | Label shown on the comms flasher on the simulation panel.&nbsp;
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|-
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| width="10%" align="center" | [[File:Fc9-type-7-icon.png]]
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| width="90%" | Scope Traces
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|-
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| colspan="2" | Selects if the scope traces are automatically generated or not&nbsp;
 +
|-
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| width="10%" align="center" | [[File:Fc9-type-7-icon.png]]
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| width="90%" | Console Data
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|-
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| colspan="2" | Selects if the console data is automatically generated or not&nbsp;
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|-
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| width="10%" align="center" | [[File:Fc9-type-16-icon.png]]
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| width="90%" | API
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|-
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| colspan="2" | &nbsp;
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|}

Latest revision as of 10:16, 16 January 2024

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

Fc9-comp-macro.png 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) 
Fc9-u8-icon.png - BYTE Return


Initialise

Fc9-comp-macro.png 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. 
Fc9-void-icon.png - VOID Return


ReceiveByte

Fc9-comp-macro.png 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 
Fc9-u8-icon.png - BYTE Last
Used to signify the last byte when streaming incoming data. 0=Not last byte, 1=Last Byte 
Fc9-u8-icon.png - BYTE Return


TransmitByte

Fc9-comp-macro.png 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. 
Fc9-u8-icon.png - BYTE Data
Data byte to send on the I²C bus. 
Fc9-u8-icon.png - BYTE Return


Property reference

Fc9-prop-icon.png Properties
Fc9-conn-icon.png Bus Settings
Fc9-type-16-icon.png Channel
Channel selection 
Fc9-type-16-icon.png Baud Select
Baud rate option selector 
Fc9-type-14-icon.png Baud Rate
Baud rate to be used 
Fc9-type-7-icon.png 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.  
Fc9-conn-icon.png Slave Setttings
Fc9-type-21-icon.png Slave Address
 
Fc9-type-21-icon.png 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 
Fc9-conn-icon.png Connections
Fc9-type-5-icon.png SDA
Pin used for SDA (data signal) 
Fc9-type-5-icon.png SCL
Pin used for SCL (clock signal) 
Fc9-conn-icon.png Simulation
Fc9-type-10-icon.png Label
Label shown on the comms flasher on the simulation panel. 
Fc9-type-7-icon.png Scope Traces
Selects if the scope traces are automatically generated or not 
Fc9-type-7-icon.png Console Data
Selects if the console data is automatically generated or not 
Fc9-type-16-icon.png API
 
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