Modification of source code to comply with C99 and C++11 standards

README.md

@@ -1,6 +1,6 @@
 # LCR Meter
 
-![Inductance Measurement](pictures/Inductor.jpg)
+![Inductance Measurement](pictures/original/Inductor.jpg)
 
 ### Key specifications
 * Measurement frequency: 100Hz-200kHz
@@ -17,4 +17,11 @@
   * ESR
   * Quality factor
 ##### Example of a sweep, showing the self-resonant frequency of a capacitor at approximately 5.5kHz
-![Inductance Measurement](pictures/Cap.jpg)
+![Inductance Measurement](pictures/original/Cap.jpg)
+
+#### Modified version:
+* Two possible toolchains: System Workbench for STM32 or IAR
+* Slightly modified PCB
+* Laser-cut acrylic case
+##### Resistance measurement 1 kOhm +- 0.1%
+![Resistance measurement](pictures/modified/precision_resistor_1k.jpg)

hardware/modified/pcb/ReadMe.md

@@ -0,0 +1,6 @@
+Changed electrical circuit and printed circuit board:
+- TAG-CONNECT ICSP connector replaced with pin header
+- SI8651EB-B-IU replaced by ADuM1401CRWZ
+- added USBLC6-2P6 for ESD protection on USB
+- the display pin header is moved closer to the edge of the board for a display tighter fit
+- added a fourth hole for mounting

hardware/modified/pcb/lib/alemv.lbr

@@ -0,0 +1,147 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE eagle SYSTEM "eagle.dtd">
+<eagle version="9.4.2">
+<drawing>
+<settings>
+<setting alwaysvectorfont="no"/>
+<setting verticaltext="up"/>
+</settings>
+<grid distance="0.1" unitdist="inch" unit="inch" style="lines" multiple="1" display="no" altdistance="0.01" altunitdist="inch" altunit="inch"/>
+<layers>
+<layer number="1" name="Top" color="4" fill="1" visible="yes" active="yes"/>
+<layer number="2" name="Route2" color="16" fill="1" visible="no" active="yes"/>
+<layer number="3" name="Route3" color="17" fill="1" visible="no" active="yes"/>
+<layer number="4" name="Route4" color="18" fill="1" visible="no" active="yes"/>
+<layer number="5" name="Route5" color="19" fill="1" visible="no" active="yes"/>
+<layer number="6" name="Route6" color="25" fill="1" visible="no" active="yes"/>
+<layer number="7" name="Route7" color="26" fill="1" visible="no" active="yes"/>
+<layer number="8" name="Route8" color="27" fill="1" visible="no" active="yes"/>
+<layer number="9" name="Route9" color="28" fill="1" visible="no" active="yes"/>
+<layer number="10" name="Route10" color="29" fill="1" visible="no" active="yes"/>
+<layer number="11" name="Route11" color="30" fill="1" visible="no" active="yes"/>
+<layer number="12" name="Route12" color="20" fill="1" visible="no" active="yes"/>
+<layer number="13" name="Route13" color="21" fill="1" visible="no" active="yes"/>
+<layer number="14" name="Route14" color="22" fill="1" visible="no" active="yes"/>
+<layer number="15" name="Route15" color="23" fill="1" visible="no" active="yes"/>
+<layer number="16" name="Bottom" color="1" fill="1" visible="yes" active="yes"/>
+<layer number="17" name="Pads" color="2" fill="1" visible="yes" active="yes"/>
+<layer number="18" name="Vias" color="2" fill="1" visible="yes" active="yes"/>
+<layer number="19" name="Unrouted" color="6" fill="1" visible="yes" active="yes"/>
+<layer number="20" name="Dimension" color="24" fill="1" visible="yes" active="yes"/>
+<layer number="21" name="tPlace" color="7" fill="1" visible="yes" active="yes"/>
+<layer number="22" name="bPlace" color="7" fill="1" visible="yes" active="yes"/>
+<layer number="23" name="tOrigins" color="15" fill="1" visible="yes" active="yes"/>
+<layer number="24" name="bOrigins" color="15" fill="1" visible="yes" active="yes"/>
+<layer number="25" name="tNames" color="7" fill="1" visible="yes" active="yes"/>
+<layer number="26" name="bNames" color="7" fill="1" visible="yes" active="yes"/>
+<layer number="27" name="tValues" color="7" fill="1" visible="yes" active="yes"/>
+<layer number="28" name="bValues" color="7" fill="1" visible="yes" active="yes"/>
+<layer number="29" name="tStop" color="7" fill="3" visible="no" active="yes"/>
+<layer number="30" name="bStop" color="7" fill="6" visible="no" active="yes"/>
+<layer number="31" name="tCream" color="7" fill="4" visible="no" active="yes"/>
+<layer number="32" name="bCream" color="7" fill="5" visible="no" active="yes"/>
+<layer number="33" name="tFinish" color="6" fill="3" visible="no" active="yes"/>
+<layer number="34" name="bFinish" color="6" fill="6" visible="no" active="yes"/>
+<layer number="35" name="tGlue" color="7" fill="4" visible="no" active="yes"/>
+<layer number="36" name="bGlue" color="7" fill="5" visible="no" active="yes"/>
+<layer number="37" name="tTest" color="7" fill="1" visible="no" active="yes"/>
+<layer number="38" name="bTest" color="7" fill="1" visible="no" active="yes"/>
+<layer number="39" name="tKeepout" color="4" fill="11" visible="yes" active="yes"/>
+<layer number="40" name="bKeepout" color="1" fill="11" visible="yes" active="yes"/>
+<layer number="41" name="tRestrict" color="4" fill="10" visible="yes" active="yes"/>
+<layer number="42" name="bRestrict" color="1" fill="10" visible="yes" active="yes"/>
+<layer number="43" name="vRestrict" color="2" fill="10" visible="yes" active="yes"/>
+<layer number="44" name="Drills" color="7" fill="1" visible="no" active="yes"/>
+<layer number="45" name="Holes" color="7" fill="1" visible="no" active="yes"/>
+<layer number="46" name="Milling" color="3" fill="1" visible="no" active="yes"/>
+<layer number="47" name="Measures" color="7" fill="1" visible="no" active="yes"/>
+<layer number="48" name="Document" color="7" fill="1" visible="yes" active="yes"/>
+<layer number="49" name="Reference" color="7" fill="1" visible="yes" active="yes"/>
+<layer number="51" name="tDocu" color="7" fill="1" visible="yes" active="yes"/>
+<layer number="52" name="bDocu" color="7" fill="1" visible="yes" active="yes"/>
+<layer number="88" name="SimResults" color="9" fill="1" visible="yes" active="yes"/>
+<layer number="89" name="SimProbes" color="9" fill="1" visible="yes" active="yes"/>
+<layer number="90" name="Modules" color="5" fill="1" visible="yes" active="yes"/>
+<layer number="91" name="Nets" color="2" fill="1" visible="yes" active="yes"/>
+<layer number="92" name="Busses" color="1" fill="1" visible="yes" active="yes"/>
+<layer number="93" name="Pins" color="2" fill="1" visible="yes" active="yes"/>
+<layer number="94" name="Symbols" color="4" fill="1" visible="yes" active="yes"/>
+<layer number="95" name="Names" color="7" fill="1" visible="yes" active="yes"/>
+<layer number="96" name="Values" color="7" fill="1" visible="yes" active="yes"/>
+<layer number="97" name="Info" color="7" fill="1" visible="yes" active="yes"/>
+<layer number="98" name="Guide" color="6" fill="1" visible="yes" active="yes"/>
+</layers>
+<library>
+<packages>
+<package name="SOT23-6" urn="urn:adsk.eagle:footprint:8086245/1">
+<description>&lt;b&gt;Small Outline Transistor&lt;/b&gt; 6 lead</description>
+<wire x1="1.422" y1="-0.781" x2="-1.423" y2="-0.781" width="0.1524" layer="51"/>
+<wire x1="-1.423" y1="-0.781" x2="-1.423" y2="0.781" width="0.1524" layer="21"/>
+<wire x1="-1.423" y1="0.781" x2="1.422" y2="0.781" width="0.1524" layer="51"/>
+<wire x1="1.422" y1="0.781" x2="1.422" y2="-0.781" width="0.1524" layer="21"/>
+<circle x="-1.15" y="-0.5" radius="0.1" width="0" layer="21"/>
+<smd name="1" x="-0.95" y="-1.15" dx="0.6" dy="0.9" layer="1"/>
+<smd name="2" x="0" y="-1.15" dx="0.6" dy="0.9" layer="1"/>
+<smd name="3" x="0.95" y="-1.15" dx="0.6" dy="0.9" layer="1"/>
+<smd name="4" x="0.95" y="1.15" dx="0.6" dy="0.9" layer="1"/>
+<smd name="5" x="0" y="1.15" dx="0.6" dy="0.9" layer="1"/>
+<smd name="6" x="-0.95" y="1.15" dx="0.6" dy="0.9" layer="1"/>
+<text x="-1.397" y="-2.672" size="1.016" layer="27" ratio="10">&gt;VALUE</text>
+<text x="-1.397" y="1.702" size="1.016" layer="25" ratio="10">&gt;NAME</text>
+<rectangle x1="-1.2" y1="-1.4" x2="-0.7" y2="-0.8" layer="51"/>
+<rectangle x1="-0.25" y1="-1.4" x2="0.25" y2="-0.8" layer="51"/>
+<rectangle x1="0.7" y1="-1.4" x2="1.2" y2="-0.8" layer="51"/>
+<rectangle x1="0.7" y1="0.8" x2="1.2" y2="1.4" layer="51"/>
+<rectangle x1="-0.25" y1="0.8" x2="0.25" y2="1.4" layer="51"/>
+<rectangle x1="-1.2" y1="0.8" x2="-0.7" y2="1.4" layer="51"/>
+</package>
+</packages>
+<symbols>
+<symbol name="USBLC6-2P6">
+<pin name="IO1" x="-12.446" y="2.54" length="short"/>
+<pin name="GND" x="-12.446" y="0" length="short" direction="pwr"/>
+<pin name="IO2" x="-12.446" y="-2.54" length="short"/>
+<pin name="IO2@1" x="10.414" y="-2.54" length="short" rot="R180"/>
+<pin name="VBUS" x="10.414" y="0" length="short" direction="pwr" rot="R180"/>
+<pin name="IO1@1" x="10.414" y="2.54" length="short" rot="R180"/>
+<wire x1="-9.906" y1="-5.08" x2="7.874" y2="-5.08" width="0.254" layer="94"/>
+<wire x1="7.874" y1="-5.08" x2="7.874" y2="5.08" width="0.254" layer="94"/>
+<wire x1="7.874" y1="5.08" x2="-9.906" y2="5.08" width="0.254" layer="94"/>
+<wire x1="-9.906" y1="5.08" x2="-9.906" y2="-5.08" width="0.254" layer="94"/>
+<text x="-5.08" y="6.35" size="1.778" layer="95">&gt;NAME</text>
+<text x="-5.588" y="-7.62" size="1.778" layer="96">&gt;VALUE</text>
+</symbol>
+</symbols>
+<devicesets>
+<deviceset name="USBLC6-2P6" prefix="U">
+<description>Very low capacitance ESD protection of VBUS (USB)</description>
+<gates>
+<gate name="G$1" symbol="USBLC6-2P6" x="25.4" y="0"/>
+</gates>
+<devices>
+<device name="" package="SOT23-6">
+<connects>
+<connect gate="G$1" pin="GND" pad="2"/>
+<connect gate="G$1" pin="IO1" pad="1"/>
+<connect gate="G$1" pin="IO1@1" pad="6"/>
+<connect gate="G$1" pin="IO2" pad="3"/>
+<connect gate="G$1" pin="IO2@1" pad="4"/>
+<connect gate="G$1" pin="VBUS" pad="5"/>
+</connects>
+<technologies>
+<technology name=""/>
+</technologies>
+</device>
+</devices>
+</deviceset>
+</devicesets>
+</library>
+</drawing>
+<compatibility>
+<note version="8.3" severity="warning">
+Since Version 8.3, EAGLE supports URNs for individual library
+assets (packages, symbols, and devices). The URNs of those assets
+will not be understood (or retained) with this version.
+</note>
+</compatibility>
+</eagle>

software/IAR/.gitignore

@@ -0,0 +1,7 @@
+# IAR files
+*.dep
+*.ewd
+*.ewt
+settings/
+Debug/
+Release/