From 64b3ccfebccecc7991231fbf40ac35895b3e19f7 Mon Sep 17 00:00:00 2001
From: Zachary Lentz <zlentz@slac.stanford.edu>
Date: Fri, 22 Mar 2024 14:52:47 -0700
Subject: [PATCH] ENH: check PLC OS to set new default dir for BSD PLCs

---
 lcls-twincat-motion/Library/Library.plcproj   |  4 +++
 .../POUs/Motion/PMPS/FB_Standard_PMPSDB.TcPOU | 29 +++++++++++++++++--
 2 files changed, 31 insertions(+), 2 deletions(-)

diff --git a/lcls-twincat-motion/Library/Library.plcproj b/lcls-twincat-motion/Library/Library.plcproj
index 20dde9f1..9429903f 100644
--- a/lcls-twincat-motion/Library/Library.plcproj
+++ b/lcls-twincat-motion/Library/Library.plcproj
@@ -631,6 +631,10 @@
       <DefaultResolution>Tc2_Utilities, * (Beckhoff Automation GmbH)</DefaultResolution>
       <Namespace>Tc2_Utilities</Namespace>
     </PlaceholderReference>
+    <PlaceholderReference Include="Tc3_IPCDiag">
+      <DefaultResolution>Tc3_IPCDiag, * (Beckhoff Automation GmbH)</DefaultResolution>
+      <Namespace>Tc3_IPCDiag</Namespace>
+    </PlaceholderReference>
     <PlaceholderReference Include="Tc3_JsonXml">
       <DefaultResolution>Tc3_JsonXml, * (Beckhoff Automation GmbH)</DefaultResolution>
       <Namespace>Tc3_JsonXml</Namespace>
diff --git a/lcls-twincat-motion/Library/POUs/Motion/PMPS/FB_Standard_PMPSDB.TcPOU b/lcls-twincat-motion/Library/POUs/Motion/PMPS/FB_Standard_PMPSDB.TcPOU
index 06d04dd3..0b0190ed 100644
--- a/lcls-twincat-motion/Library/POUs/Motion/PMPS/FB_Standard_PMPSDB.TcPOU
+++ b/lcls-twincat-motion/Library/POUs/Motion/PMPS/FB_Standard_PMPSDB.TcPOU
@@ -22,7 +22,7 @@ VAR_INPUT
     // Set to TRUE to cause an extra read.
     bRefresh: BOOL;
     // Directory where the DB is stored.
-    sDirectory: STRING := '/Hard Disk/ftp/PMPS/';
+    sDirectory: STRING := '';
 END_VAR
 VAR_OUTPUT
     {attribute 'pytmc' := '
@@ -42,6 +42,10 @@ VAR
     fbTime : FB_LocalSystemTime := ( bEnable := TRUE, dwCycle := 1 );
     fbTime_to_UTC: FB_TzSpecificLocalTimeToSystemTime;
     fbGetTimeZone: FB_GetTimeZoneInformation;
+
+    fbIPCReg: FB_IPCDiag_Register;
+    fbCheckOS: FB_IPCDiag_ReadParameter;
+    sOSName: STRING;
 END_VAR
 ]]></Declaration>
     <Implementation>
@@ -62,9 +66,30 @@ IF rtEnable.Q OR rtRefresh.Q THEN
     bExecute := TRUE;
 END_IF
 
+IF sDirectory = '' THEN
+    // Check OS for default directory
+    fbIPCReg(bExecute:=TRUE);
+    fbCheckOS(
+        bExecute:=NOT fbIPCReg.bBusy,
+        eParameterKey:=E_IPCDiag_ParameterKey.OS_Name,
+        fbRegister:=fbIPCReg,
+    );
+    IF fbCheckOS.bValid THEN
+        fbCheckOS.GetParameter(
+            pBuffer:=ADR(sOSName),
+            nBufferSize:=SIZEOF(sOSName),
+        );
+    END_IF
+    IF sOSName = 'TwinCAT/BSD' THEN
+        sDirectory := '/home/ecs-user/pmpsdb/';
+    ELSIF sOSName <> '' THEN
+        sDirectory := '/Hard Disk/ftp/PMPS/';
+    END_IF
+END_IF
+
 MOTION_GVL.fbPmpsFileReader(
     io_fbFFHWO:=io_fbFFHWO,
-    bExecute:=bExecute,
+    bExecute:=bExecute AND sDirectory <> '',
     sSrcPathName:=CONCAT(CONCAT(sDirectory, sPlcName), '.json'),
     sPLCName:=sPLCName,
     PMPS_jsonDoc=>PMPS_GVL.BP_jsonDoc,