Difference between revisions of "Unit RPIGPIOEXPANDER"

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----
 
----
  
−
'''Raspberry Pi Firmware GPIO Expander Driver'''
+
'''Raspberry Pi Firmware GPIO Expander Driver unit'''
  
−
As of February 2017 the Raspberry Pi firmware contains a mailbox interface to allow control of the GPIO expander on the Raspberry Pi 3 and Compute Module 3.
+
As of February 2017 the Raspberry Pi firmware contains a mailbox interface to allow control of the GPIO expander on the Raspberry Pi 3/4 and Compute Module 3/4.
  
 
Unlike the earlier virtual GPIO interface this mailbox service now supports most GPIO functionality including getting and setting a pin value, getting and changing the pin function and getting or changing the pull up/down options.
 
Unlike the earlier virtual GPIO interface this mailbox service now supports most GPIO functionality including getting and setting a pin value, getting and changing the pin function and getting or changing the pull up/down options.
Line 13: Line 13:
 
This driver implements most of the functionality available in the new mailbox service as a standard Ultibo GPIO device and also provides direct mailbox calls to allow access to any additional options not covered by the GPIO device API.
 
This driver implements most of the functionality available in the new mailbox service as a standard Ultibo GPIO device and also provides direct mailbox calls to allow access to any additional options not covered by the GPIO device API.
 
   
 
   
−
When included in a project this driver replaces the Virtual GPIO functions provided by the PlatformRPi2 and PlatformRPi3 units.
+
When included in a project this driver replaces the Virtual GPIO functions provided by the PlatformRPi2, PlatformRPi3, PlatformRPi4 units.
 
    
 
    
 
According to /arch/arm/boot/dts/bcm2710-rpi-3-b.dts the following pin assignments are known:
 
According to /arch/arm/boot/dts/bcm2710-rpi-3-b.dts the following pin assignments are known:
Line 21: Line 21:
 
* GPIO_PIN_7 = Power LED (Input / Active Low)
 
* GPIO_PIN_7 = Power LED (Input / Active Low)
  
−
Note that this driver requires the most recent firmware (later than February 2017) and has been tested successfully with the firmware release from 22 May 2017.
+
For the Raspberry Pi 3B+ the assignments shown in /arch/arm/boot/dts/bcm2710-rpi-3-b.dts have changed as follows:
 +
 
 +
*GPIO_PIN_2 = Power LED (Active Low)
 +
*GPIO_PIN_4 = HDMI Detect (Input / Active Low)
 +
 
 +
For the Raspberry Pi 4B the assignments shown in /arch/arm/boot/dts/bcm2711-rpi-4-b.dts are:
 +
 +
*GPIO_PIN_0 = Bluetooth Power (Active High) (BT_ON)
 +
*GPIO_PIN_1 = WiFi Power Sequencer (Active Low) (WL_ON)
 +
*GPIO_PIN_2 = Power LED (Active Low) (PWR_LED_OFF)
 +
*GPIO_PIN_3 = (GLOBAL_RESET) (ANT1 on CM4)
 +
*GPIO_PIN_4 = SDIO 1.8V regulator (Active High) (VDD_SD_IO_SEL)
 +
*GPIO_PIN_5 = CAM1 regulator (Active High) (CAM_GPIO)
 +
*GPIO_PIN_6 = SD VCC regulator (Active High) (SD_PWR_ON)
 +
*GPIO_PIN_7 = (SD_OC_N) (ANT2 on CM4)
 +
 
 +
The Pi 400 and CM4 files at bcm2711-rpi-400.dts and bcm2711-rpi-cm4.dts show identical assignments as the Pi 4B.
 +
 
 +
Note that this driver requires recent firmware (later than February 2017) and has been tested successfully with the firmware release from 8 October 2020.
 
   
 
   
 
The latest version of the firmware is available from https://github.com/raspberrypi/firmware
 
The latest version of the firmware is available from https://github.com/raspberrypi/firmware
Line 80: Line 98:
 
----
 
----
  
−
''To be documented''
+
 
 +
'''RPiGPIO expander specific types'''
 +
 
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial;">
 +
<code>PRPiGPIOExpander = ^TRPiGPIOExpander;</code>
 +
 
 +
<code>TRPiGPIOExpander = record</code>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
|colspan="2"|''GPIO Properties''
 +
|-
 +
| <code>GPIO:TGPIODevice;</code>
 +
| style="width: 50%;"|&nbsp;
 +
|-
 +
|colspan="2"|''RPiGPIO Expander Properties''
 +
|-
 +
| &nbsp;
 +
| &nbsp;
 +
|-
 +
|}
 +
</div></div>
 +
<br />
  
 
=== Public variables ===
 
=== Public variables ===
Line 90: Line 130:
 
----
 
----
  
−
''To be documented''
 
  
 +
'''Initialization functions'''
 +
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 +
<pre style="border: 0; padding-bottom:0px;">procedure RPiGPIOExpanderInit;</pre>
 +
<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Initialize the RPiGPIO Expander unit and create, register and start the device</div>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
! Note
 +
| Called only during system startup
 +
|-
 +
|}
 +
</div></div>
 +
<br />
 +
 +
'''RPiGPIO expander GPIO functions'''
 +
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 +
<pre style="border: 0; padding-bottom:0px;">function RPiGPIOExpanderStart(GPIO:PGPIODevice):LongWord;</pre>
 +
<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Implementation of GPIODeviceStart API for RPiGPIO Expander</div>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
! Note
 +
| Not intended to be called directly by applications, use GPIODeviceStart instead.
 +
|-
 +
|}
 +
</div></div>
 +
<br />
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 +
<pre style="border: 0; padding-bottom:0px;">function RPiGPIOExpanderStop(GPIO:PGPIODevice):LongWord;</pre>
 +
<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Implementation of GPIODeviceStop API for RPiGPIO Expander</div>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
! Note
 +
| Not intended to be called directly by applications, use GPIODeviceStop instead.
 +
|-
 +
|}
 +
</div></div>
 +
<br />
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 +
<pre style="border: 0; padding-bottom:0px;">function RPiGPIOExpanderInputGet(GPIO:PGPIODevice; Pin:LongWord):LongWord;</pre>
 +
<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Implementation of GPIODeviceInputGet API for RPiGPIO Expander</div>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
! Note
 +
| Not intended to be called directly by applications, use GPIODeviceInputGet instead.
 +
|-
 +
|}
 +
</div></div>
 +
<br />
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 +
<pre style="border: 0; padding-bottom:0px;">function RPiGPIOExpanderOutputSet(GPIO:PGPIODevice; Pin,Level:LongWord):LongWord;</pre>
 +
<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Implementation of GPIODeviceOutputSet API for RPiGPIO Expander</div>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
! Note
 +
| Not intended to be called directly by applications, use GPIODeviceOutputSet instead.
 +
|-
 +
|}
 +
</div></div>
 +
<br />
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 +
<pre style="border: 0; padding-bottom:0px;">function RPiGPIOExpanderPullGet(GPIO:PGPIODevice; Pin:LongWord):LongWord;</pre>
 +
<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Implementation of GPIODevicePullGet API for RPiGPIO Expander</div>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
! Note
 +
| Not intended to be called directly by applications, use GPIODevicePullGet instead.
 +
|-
 +
|}
 +
</div></div>
 +
<br />
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 +
<pre style="border: 0; padding-bottom:0px;">function RPiGPIOExpanderPullSelect(GPIO:PGPIODevice; Pin,Mode:LongWord):LongWord;</pre>
 +
<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Implementation of GPIODevicePullSelect API for RPiGPIO Expander</div>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
! Note
 +
| Not intended to be called directly by applications, use GPIODevicePullSelect instead.
 +
|-
 +
|}
 +
</div></div>
 +
<br />
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 +
<pre style="border: 0; padding-bottom:0px;">function RPiGPIOExpanderFunctionGet(GPIO:PGPIODevice; Pin:LongWord):LongWord;</pre>
 +
<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Implementation of GPIODeviceFunctionGet API for RPiGPIO Expander</div>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
! Note
 +
| Not intended to be called directly by applications, use GPIODeviceFunctionGet instead.
 +
|-
 +
|}
 +
</div></div>
 +
<br />
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 +
<pre style="border: 0; padding-bottom:0px;">function RPiGPIOExpanderFunctionSelect(GPIO:PGPIODevice; Pin,Mode:LongWord):LongWord;</pre>
 +
<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Implementation of GPIODeviceFunctionSelect API for RPiGPIO Expander</div>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
! Note
 +
| Not intended to be called directly by applications, use GPIODeviceFunctionSelect instead.
 +
|-
 +
|}
 +
</div></div>
 +
<br />
 +
 +
'''RTL virtual GPIO functions'''
 +
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 +
<pre style="border: 0; padding-bottom:0px;">function SysVirtualGPIOInputGet(Pin:LongWord):LongWord;</pre>
 +
<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Get the current state of a virtual GPIO input pin</div>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
! Pin
 +
| The pin to get the state for (eg VIRTUAL_GPIO_PIN_1)
 +
|-
 +
! Return
 +
| The current state (eg GPIO_LEVEL_HIGH) or GPIO_LEVEL_UNKNOWN on failure
 +
|-
 +
|}
 +
</div></div>
 +
<br />
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 +
<pre style="border: 0; padding-bottom:0px;">function SysVirtualGPIOOutputSet(Pin,Level:LongWord):LongWord;</pre>
 +
<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Set the state of a virtual GPIO output pin</div>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
! Pin
 +
| The pin to set the state for (eg GPIO_PIN_1)
 +
|-
 +
! Level
 +
| The state to set the pin to (eg GPIO_LEVEL_HIGH)
 +
|-
 +
! Return
 +
| ERROR_SUCCESS if completed successfully or another error code on failure
 +
|-
 +
|}
 +
</div></div>
 +
<br />
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 +
<pre style="border: 0; padding-bottom:0px;">function SysVirtualGPIOFunctionGet(Pin:LongWord):LongWord;</pre>
 +
<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Get the current function of a virtual GPIO pin</div>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
! Pin
 +
| The pin to get the function for (eg GPIO_PIN_1)
 +
|-
 +
! Return
 +
| The current function of the pin (eg GPIO_FUNCTION_IN) or GPIO_FUNCTION_UNKNOWN on failure
 +
|-
 +
|}
 +
</div></div>
 +
<br />
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 +
<pre style="border: 0; padding-bottom:0px;">function SysVirtualGPIOFunctionSelect(Pin,Mode:LongWord):LongWord;</pre>
 +
<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Change the function of a virtual GPIO pin</div>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
! Pin
 +
| The pin to change the function for (eg GPIO_PIN_1)
 +
|-
 +
! Mode
 +
| The function to set for the pin (eg GPIO_FUNCTION_OUT)
 +
|-
 +
! Return
 +
| ERROR_SUCCESS if completed successfully or another error code on failure
 +
|-
 +
|}
 +
</div></div>
 +
<br />
 +
 +
'''RPiGPIO expander helper functions'''
 +
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 +
<pre style="border: 0; padding-bottom:0px;">function RPiGPIOExpanderGetState(GPIO:LongWord; var State:LongWord):LongWord;</pre>
 +
<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Raspberry Pi Firmware Mailbox call for Get GPIO State</div>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
! Note
 +
| None documented
 +
|-
 +
|}
 +
</div></div>
 +
<br />
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 +
<pre style="border: 0; padding-bottom:0px;">function RPiGPIOExpanderSetState(GPIO,State:LongWord):LongWord;</pre>
 +
<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Raspberry Pi Firmware Mailbox call for Set GPIO State</div>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
! Note
 +
| None documented
 +
|-
 +
|}
 +
</div></div>
 +
<br />
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 +
<pre style="border: 0; padding-bottom:0px;">function RPiGPIOExpanderGetConfig(GPIO:LongWord; var Direction,Polarity,Terminator,PullUp:LongWord):LongWord;</pre>
 +
<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Raspberry Pi Firmware Mailbox call for Get GPIO Config</div>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
! Note
 +
| None documented
 +
|-
 +
|}
 +
</div></div>
 +
<br />
 +
<div class="toccolours mw-collapsible mw-collapsed" style="border: 1; font-family: arial; padding-top: 0px; padding-bottom: 15px;">
 +
<pre style="border: 0; padding-bottom:0px;">function RPiGPIOExpanderSetConfig(GPIO,Direction,Polarity,Terminator,PullUp,State:LongWord):LongWord;</pre>
 +
<div style="font-size: 14px; padding-left: 12px;">'''Description:''' Raspberry Pi Firmware Mailbox call for Set GPIO Config</div>
 +
<div class="mw-collapsible-content" style="text-align: left; padding-left: 5px;">
 +
{| class="wikitable" style="font-size: 14px; background: white;"
 +
|-
 +
! Note
 +
| None documented
 +
|-
 +
|}
 +
</div></div>
 +
<br />
  
 
Return to [[Unit_Reference|Unit Reference]]
 
Return to [[Unit_Reference|Unit Reference]]

Latest revision as of 05:19, 17 June 2021

Return to Unit Reference


Description

Raspberry Pi Firmware GPIO Expander Driver unit

As of February 2017 the Raspberry Pi firmware contains a mailbox interface to allow control of the GPIO expander on the Raspberry Pi 3/4 and Compute Module 3/4.

Unlike the earlier virtual GPIO interface this mailbox service now supports most GPIO functionality including getting and setting a pin value, getting and changing the pin function and getting or changing the pull up/down options.

This driver implements most of the functionality available in the new mailbox service as a standard Ultibo GPIO device and also provides direct mailbox calls to allow access to any additional options not covered by the GPIO device API.

When included in a project this driver replaces the Virtual GPIO functions provided by the PlatformRPi2, PlatformRPi3, PlatformRPi4 units.

According to /arch/arm/boot/dts/bcm2710-rpi-3-b.dts the following pin assignments are known:

  • GPIO_PIN_2 = Activity LED
  • GPIO_PIN_4 = HDMI Detect (Input / Active Low)
  • GPIO_PIN_7 = Power LED (Input / Active Low)

For the Raspberry Pi 3B+ the assignments shown in /arch/arm/boot/dts/bcm2710-rpi-3-b.dts have changed as follows:

  • GPIO_PIN_2 = Power LED (Active Low)
  • GPIO_PIN_4 = HDMI Detect (Input / Active Low)

For the Raspberry Pi 4B the assignments shown in /arch/arm/boot/dts/bcm2711-rpi-4-b.dts are:

  • GPIO_PIN_0 = Bluetooth Power (Active High) (BT_ON)
  • GPIO_PIN_1 = WiFi Power Sequencer (Active Low) (WL_ON)
  • GPIO_PIN_2 = Power LED (Active Low) (PWR_LED_OFF)
  • GPIO_PIN_3 = (GLOBAL_RESET) (ANT1 on CM4)
  • GPIO_PIN_4 = SDIO 1.8V regulator (Active High) (VDD_SD_IO_SEL)
  • GPIO_PIN_5 = CAM1 regulator (Active High) (CAM_GPIO)
  • GPIO_PIN_6 = SD VCC regulator (Active High) (SD_PWR_ON)
  • GPIO_PIN_7 = (SD_OC_N) (ANT2 on CM4)

The Pi 400 and CM4 files at bcm2711-rpi-400.dts and bcm2711-rpi-cm4.dts show identical assignments as the Pi 4B.

Note that this driver requires recent firmware (later than February 2017) and has been tested successfully with the firmware release from 8 October 2020.

The latest version of the firmware is available from https://github.com/raspberrypi/firmware

Constants


RPiGPIO expander specific constants RPIGPIOEXP_GPIO_*
RPIGPIOEXP_GPIO_DESCRIPTION = 'Raspberry Pi Firmware GPIO Expander'; Description of RPiGPIO Expander device
 
RPIGPIOEXP_GPIO_MIN_PIN = GPIO_PIN_0;  
RPIGPIOEXP_GPIO_MAX_PIN = GPIO_PIN_7;  
 
RPIGPIOEXP_GPIO_PIN_COUNT = 8;  
 
RPIGPIOEXP_GPIO_PIN_OFFSET = 128;  
 
RPIGPIOEXP_GPIO_MAX_LEVEL = GPIO_LEVEL_HIGH;  
 
RPIGPIOEXP_GPIO_MAX_PULL = GPIO_PULL_DOWN;  
 
RPIGPIOEXP_GPIO_MIN_FUNCTION = GPIO_FUNCTION_IN;  
RPIGPIOEXP_GPIO_MAX_FUNCTION = GPIO_FUNCTION_OUT;  


Type definitions


RPiGPIO expander specific types

PRPiGPIOExpander = ^TRPiGPIOExpander;

TRPiGPIOExpander = record

GPIO Properties
GPIO:TGPIODevice;  
RPiGPIO Expander Properties
   


Public variables

None defined

Function declarations


Initialization functions 

procedure RPiGPIOExpanderInit;
Description: Initialize the RPiGPIO Expander unit and create, register and start the device
Note Called only during system startup


RPiGPIO expander GPIO functions 

function RPiGPIOExpanderStart(GPIO:PGPIODevice):LongWord;
Description: Implementation of GPIODeviceStart API for RPiGPIO Expander
Note Not intended to be called directly by applications, use GPIODeviceStart instead. 


function RPiGPIOExpanderStop(GPIO:PGPIODevice):LongWord;
Description: Implementation of GPIODeviceStop API for RPiGPIO Expander
Note Not intended to be called directly by applications, use GPIODeviceStop instead. 


function RPiGPIOExpanderInputGet(GPIO:PGPIODevice; Pin:LongWord):LongWord;
Description: Implementation of GPIODeviceInputGet API for RPiGPIO Expander
Note Not intended to be called directly by applications, use GPIODeviceInputGet instead. 


function RPiGPIOExpanderOutputSet(GPIO:PGPIODevice; Pin,Level:LongWord):LongWord;
Description: Implementation of GPIODeviceOutputSet API for RPiGPIO Expander
Note Not intended to be called directly by applications, use GPIODeviceOutputSet instead. 


function RPiGPIOExpanderPullGet(GPIO:PGPIODevice; Pin:LongWord):LongWord;
Description: Implementation of GPIODevicePullGet API for RPiGPIO Expander
Note Not intended to be called directly by applications, use GPIODevicePullGet instead. 


function RPiGPIOExpanderPullSelect(GPIO:PGPIODevice; Pin,Mode:LongWord):LongWord;
Description: Implementation of GPIODevicePullSelect API for RPiGPIO Expander
Note Not intended to be called directly by applications, use GPIODevicePullSelect instead. 


function RPiGPIOExpanderFunctionGet(GPIO:PGPIODevice; Pin:LongWord):LongWord;
Description: Implementation of GPIODeviceFunctionGet API for RPiGPIO Expander
Note Not intended to be called directly by applications, use GPIODeviceFunctionGet instead. 


function RPiGPIOExpanderFunctionSelect(GPIO:PGPIODevice; Pin,Mode:LongWord):LongWord;
Description: Implementation of GPIODeviceFunctionSelect API for RPiGPIO Expander
Note Not intended to be called directly by applications, use GPIODeviceFunctionSelect instead.


RTL virtual GPIO functions 

function SysVirtualGPIOInputGet(Pin:LongWord):LongWord;
Description: Get the current state of a virtual GPIO input pin
Pin The pin to get the state for (eg VIRTUAL_GPIO_PIN_1)
Return The current state (eg GPIO_LEVEL_HIGH) or GPIO_LEVEL_UNKNOWN on failure 


function SysVirtualGPIOOutputSet(Pin,Level:LongWord):LongWord;
Description: Set the state of a virtual GPIO output pin
Pin The pin to set the state for (eg GPIO_PIN_1)
Level The state to set the pin to (eg GPIO_LEVEL_HIGH)
Return ERROR_SUCCESS if completed successfully or another error code on failure 


function SysVirtualGPIOFunctionGet(Pin:LongWord):LongWord;
Description: Get the current function of a virtual GPIO pin
Pin The pin to get the function for (eg GPIO_PIN_1)
Return The current function of the pin (eg GPIO_FUNCTION_IN) or GPIO_FUNCTION_UNKNOWN on failure 


function SysVirtualGPIOFunctionSelect(Pin,Mode:LongWord):LongWord;
Description: Change the function of a virtual GPIO pin
Pin The pin to change the function for (eg GPIO_PIN_1)
Mode The function to set for the pin (eg GPIO_FUNCTION_OUT)
Return ERROR_SUCCESS if completed successfully or another error code on failure


RPiGPIO expander helper functions 

function RPiGPIOExpanderGetState(GPIO:LongWord; var State:LongWord):LongWord;
Description: Raspberry Pi Firmware Mailbox call for Get GPIO State
Note None documented 


function RPiGPIOExpanderSetState(GPIO,State:LongWord):LongWord;
Description: Raspberry Pi Firmware Mailbox call for Set GPIO State
Note None documented 


function RPiGPIOExpanderGetConfig(GPIO:LongWord; var Direction,Polarity,Terminator,PullUp:LongWord):LongWord;
Description: Raspberry Pi Firmware Mailbox call for Get GPIO Config
Note None documented 


function RPiGPIOExpanderSetConfig(GPIO,Direction,Polarity,Terminator,PullUp,State:LongWord):LongWord;
Description: Raspberry Pi Firmware Mailbox call for Set GPIO Config
Note None documented


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