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gpio-mod: ./trunk/gpiomod/GPIOMods.library.md ^{Bash bash (Bash)}
--- This FB can be used to sample analog data by using two GPIO Pins: - one digital input - one digital output There are also other circuits out there, which only need one single GPIO. But they have the clear disadvantage that they need to reconfigure this GPIO constantly. Additionally you have to take care about the VRef, which you are using, as it will be pulled to ground by the GPIO acting as an output. You need to take care to not destroy your board with that. In the Circuit, recommended here, it is to my understanding much safer, as we simply use the digital output as our VRef. Therefore we can easily and safely pull it to ground. Wirering:: Digital Output (VRef) v R1 (2,2kOhm) v Transistor / Poti / LDR / ... |---> Input Pin C1 (1uF) v GND Scheduling: The accuracy of the measurement relies in some aspects on the scheduling. So it is recommended to schedule the task, which is driving this FB, as frequent as possible. It is generally OK to combine this FB with the SoftPWM. Just the sampling accuracy will slightly vary, depending on the frequency of the PWM. ~~~ST FUNCTION_BLOCK SoftAIN VAR_INPUT xInput: BOOL; END_VAR VAR_OUTPUT xOutput: BOOL; rVal: REAL; END_VAR VAR xSampling: BOOL; tStart: SYSTIME; tCurrent: SYSTIME; xInit: BOOL; END_VAR VAR ctDischarge: SYSTIME; crScale: REAL; END_VAR ~~~ ~~~ST SysTimeGetUs(tCurrent); IF xInit THEN xInit := FALSE; tStart := tCurrent; END_IF IF xSampling THEN // Reading the sampling pin, and measure the time IF xInput THEN /// capacitor is full, stop sampling, and discharge xSampling := FALSE; rVal := LWORD_TO_REAL(tCurrent - tStart) * crScale; tStart := tCurrent; END_IF ELSE // Discharge the capacitor IF tCurrent - tStart > ctDischarge THEN // start sampling tStart := tCurrent; xOutput := TRUE; END_IF END_IF ~~~ --- This FB can be used to implement a Soft PWM, based on the scheduler of a Linux system. Note, that this function block should be used in a a high priority task. The interval of the task will constantly change. ~~~ST FUNCTION_BLOCK SoftPWM VAR_INPUT dwFrequ: DWORD; rDutyCycle: REAL; END_VAR VAR_OUTPUT xPWM: BOOL; END_VAR VAR hTask: SysTask.RTS_IEC_HANDLE; ulInterval: DWORD; END_VAR VAR cMinInterval: DWORD; END_VAR ~~~ ~~~ST (* If current task is not, yet, determined, get it *) IF hTask = SysTask.RTS_INVALID_HANDLE THEN SysTask.SysTaskGetCurrent(ADR(hTask)); END_IF (* if task is determined, adjust next cycle *) IF hTask <> SysTask.RTS_INVALID_HANDLE THEN IF xPWM THEN ulInterval := LREAL_TO_DWORD((LREAL#1000000 / DWORD_TO_LREAL(dwFrequ)) * rDutyCycle); ELSE ulInterval := LREAL_TO_DWORD((LREAL#1000000 / DWORD_TO_LREAL(dwFrequ)) * (LREAL#1 - rDutyCycle)); END_IF (* if we are near the boundary values, we snap the output either to TRUE or FALSE *) IF ulInterval < cMinInterval THEN SysTask.SysTaskSetInterval(hTask, DWORD#1000000 / dwFrequ); ELSE SysTask.SysTaskSetInterval(hTask, ulInterval); xPWM := NOT xPWM; END_IF END_IF ~~~
Last updated: 2018-09-18

gpio-mod: ./trunk/gpiomod/license.txt ^{Bash bash (Bash)}
MIT License Copyright (c) [year] [fullname] Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Last updated: 2018-08-22

gpio-mod: ./trunk/gpiomod/package.manifest ^{Bash bash (Bash)}
<?xml version="1.0" encoding="ISO-8859-1"?> <Package> <Strings> <String Id="GeneralName"> <Neutral>GPIO Mods</Neutral> </String> <String Id="GeneralVendor"> <Neutral>Open Source Software</Neutral> </String> <String Id="GeneralCopyright"> <Neutral>all rights reserved</Neutral> </String> <String Id="GeneralDescription"> <Neutral></Neutral> </String> <String Id="license"> <Neutral>LICENSE.TXT</Neutral> </String> <String Id="TargetDir"> <Neutral>Target directory</Neutral> </String> <String Id="TargetDirDescription"> <Neutral>The target directory where the projects are saved.</Neutral> </String> </Strings> <General> <Id>{3d79667a-a648-11e8-a9fd-e5f6498540b8}</Id> <Version>1.0.0.3</Version> <Name>$GeneralName</Name> <Vendor>$GeneralVendor</Vendor> <Copyright>$GeneralCopyright</Copyright> <Description>$GeneralDescription</Description> <LicenseAgreement>$license</LicenseAgreement> <RequiredInstallerVersion>3.5.10.0</RequiredInstallerVersion> </General> <TargetDirectoryDefinitions> <TargetDirectoryDefinition> <Id>1</Id> <Name>$TargetDir</Name> <Description>$TargetDirDescription</Description> <PromptUser>True</PromptUser> <DefaultValue>%USERPROFILE%\CODESYS Projects\</DefaultValue> </TargetDirectoryDefinition> </TargetDirectoryDefinitions> <Components> <Component> <General> <Id>1</Id> <Name>Default</Name> <Description>Default Package</Description> <Selectable>false</Selectable> <SelectedByDefault>true</SelectedByDefault> </General> <Dependencies> </Dependencies> <Items> <Library> <Path>GPIOMods.library</Path> </Library> </Items> </Component> </Components> </Package>
Last updated: 2018-09-18

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