Difference between revisions of "Component: IO Expander (PCF8574) (PCF8574) (General Input)"

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==Component Source Code==
 
==Component Source Code==
  
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Please click here for the component source code: [https://www.flowcode.co.uk/wikicopy/componentsource/FC_Comp_Source_IOEXP_PCF8574.fcfx FC_Comp_Source_IOEXP_PCF8574.fcfx]
+
Please click here to view the component source code (Beta): [https://www.flowcode.co.uk/FlowchartView/?wfile=componentsource/FC_Comp_Source_IOEXP_PCF8574.fcfx FC_Comp_Source_IOEXP_PCF8574.fcfx]
  
 
==Detailed description==
 
==Detailed description==
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 +
  
  
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==Examples==
 
==Examples==
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 +
  
  
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==Macro reference==
 
==Macro reference==
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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]]
 +
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''ReadPort'''
 +
|-
 +
| colspan="2" | Reads the value of the IO pins. 
 +
|-
 +
|-
 +
| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:Fc9-u8-icon.png]] - BYTE
 +
| width="90%" style="border-top: 2px solid #000;" | ''Return''
 +
|}
 +
 +
 +
{| 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;" | '''WritePort'''
 +
|-
 +
| colspan="2" | Writes a value to the IO pins. 
 +
|-
 +
|-
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| width="10%" align="center" | [[File:Fc9-u8-icon.png]] - BYTE
 +
| width="90%" | Value
 +
|-
 +
| colspan="2" | Value to write. Range 0-255 
 +
|-
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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''
 +
|}
 +
 +
 +
{| 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;" | '''Initialise'''
 +
|-
 +
| colspan="2" |  
 +
|-
 +
|-
 +
| width="10%" align="center" style="border-top: 2px solid #000;" | [[File:Fc9-void-icon.png]] - VOID
 +
| width="90%" style="border-top: 2px solid #000;" | ''Return''
 +
|}
 +
 +
 +
 +
 +
==Property reference==
 +
 +
{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
 +
|-
 +
| width="10%" align="center" style="background-color:#D8C9D8;" | [[File:Fc9-prop-icon.png]]
 +
| width="90%" style="background-color:#D8C9D8; color:#4B008D;" | '''Properties'''
 +
|-
 +
|-
 +
| width="10%" align="center" style="background-color:#EAE1EA;" | [[File:Fc9-conn-icon.png]]
 +
| width="90%" style="background-color:#EAE1EA; color:#4B008D;" | I²C Communications
 +
|-
 +
|-
 +
| width="10%" align="center" | [[File:Fc9-type-16-icon.png]]
 +
| width="90%" | Device Type
 +
|-
 +
| colspan="2" |  
 +
|-
 +
| width="10%" align="center" | [[File:Fc9-type-16-icon.png]]
 +
| width="90%" | External Address
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|-
 +
| colspan="2" | Selects the value of the three address pins for the MCP23S17. 
 +
|-
 +
| width="10%" align="center" | [[File:Fc9-type-16-icon.png]]
 +
| width="90%" | Channel
 +
|-
 +
| colspan="2" | Channel selection 
 +
|-
 +
| width="10%" align="center" | [[File:Fc9-type-7-icon.png]]
 +
| width="90%" | Stop Delay
 +
|-
 +
| 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.  
 +
|-
 +
| width="10%" align="center" | [[File:Fc9-type-16-icon.png]]
 +
| width="90%" | Baud Select
 +
|-
 +
| colspan="2" | Baud rate option selector 
 +
|-
 +
| width="10%" align="center" | [[File:Fc9-type-14-icon.png]]
 +
| width="90%" | Baud Rate
 +
|-
 +
| colspan="2" | Baud rate to be used 
 +
|-
 +
| width="10%" align="center" | [[File:Fc9-type-5-icon.png]]
 +
| width="90%" | SDA
 +
|-
 +
| colspan="2" | Pin used for SDA (data signal) 
 +
|-
 +
| width="10%" align="center" | [[File:Fc9-type-5-icon.png]]
 +
| width="90%" | SCL
 +
|-
 +
| colspan="2" | Pin used for SCL (clock signal) 
 +
|-
 +
| width="10%" align="center" style="background-color:#EAE1EA;" | [[File:Fc9-conn-icon.png]]
 +
| width="90%" style="background-color:#EAE1EA; color:#4B008D;" | Simulation
 +
|-
 +
|-
 +
| width="10%" align="center" | [[File:Fc9-type-10-icon.png]]
 +
| width="90%" | Label
 +
|-
 +
| colspan="2" |  
 +
|-
 +
| width="10%" align="center" | [[File:Fc9-type-7-icon.png]]
 +
| width="90%" | Scope Traces
 +
|-
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| colspan="2" | Selects if the scope traces are automatically generated or not 
 +
|-
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| width="10%" align="center" | [[File:Fc9-type-7-icon.png]]
 +
| width="90%" | Console Data
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|-
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| colspan="2" | Selects if the console data is automatically generated or not 
 +
|-
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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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|-
 +
| colspan="2" |  
 +
|}==Macro reference==
  
 
{| class="wikitable" style="width:60%; background-color:#FFFFFF;"
 
{| class="wikitable" style="width:60%; background-color:#FFFFFF;"

Revision as of 15:15, 20 January 2023

Author Matrix TSL
Version 1.0
Category General Input


IO Expander (PCF8574) component

Provides 8 digital input/output pins arranged into an 8-bit port using a I2C bus connection. Up to eight expanders can be connected to the same I2C peripheral by means of three address pins. Supports the PCF8574 and PCF8574A devices allowing up to 16 expanders to be connected to the same I2C bus ( 8 x PCF8574 + 8 x PCF8574A ).

Component Source Code

Please click here to view the component source code (Beta): FC_Comp_Source_IOEXP_PCF8574.fcfx

Detailed description

No detailed description exists yet for this component

Examples

No additional examples


Macro reference

Fc9-comp-macro.png ReadPort
Reads the value of the IO pins. 
Fc9-u8-icon.png - BYTE Return


Fc9-comp-macro.png WritePort
Writes a value to the IO pins. 
Fc9-u8-icon.png - BYTE Value
Value to write. Range 0-255 
Fc9-void-icon.png - VOID Return


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



Property reference

Fc9-prop-icon.png Properties
Fc9-conn-icon.png I²C Communications
Fc9-type-16-icon.png Device Type
 
Fc9-type-16-icon.png External Address
Selects the value of the three address pins for the MCP23S17. 
Fc9-type-16-icon.png Channel
Channel selection 
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-type-16-icon.png Baud Select
Baud rate option selector 
Fc9-type-14-icon.png Baud Rate
Baud rate to be used 
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
 
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
 

==Macro reference==

Fc9-comp-macro.png ReadPort
Reads the value of the IO pins. 
Fc9-u8-icon.png - BYTE Return


Fc9-comp-macro.png WritePort
Writes a value to the IO pins. 
Fc9-u8-icon.png - BYTE Value
Value to write. Range 0-255 
Fc9-void-icon.png - VOID Return


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



Property reference

Fc9-prop-icon.png Properties
Fc9-conn-icon.png I²C Communications
Fc9-type-16-icon.png Device Type
 
Fc9-type-16-icon.png External Address
Selects the value of the three address pins for the MCP23S17. 
Fc9-type-16-icon.png Channel
Channel selection 
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-type-16-icon.png Baud Select
Baud rate option selector 
Fc9-type-14-icon.png Baud Rate
Baud rate to be used 
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
 
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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