README.md

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* PROJECT : Pi4J :: EXTENSION

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MCP23017 1602A GPB0 RS GPB1 RW GPB2 EN GPA0 D0 GPA1 D1 GPA2 D2 GPA3 D3 GPA4 D4 GPA5 D5 GPA6 D6 GPA7 D7 VSS grnd VDD +5 V0 grnd A +5 K grnd A2 grnd A1 +5 A0 grnd

Simple implementation of MCP23017, specific to controlling a 1602A LCD. If you are interested
in a full utilization of all MCP23017 functionality, see :
src/main/java/com/pi4j/devices/mcp23017/README.md
and src/main/java/com/pi4j/devices/mcp23xxxApplication/README.md

1. mvn clean package
2. cd target/distribution
3. sudo ./runMCP23017_LCD.sh.sh parms........

sudo ./runMCP23017_LCD.sh -b 0x01 -a 0x21 -x 4 -t trace -line1 aBc -line2 XyZ Bus 1, address 0x21, reset pin GPIO4, detailed logging , line one text, line two text
Clears display, Line1 begins in fourth position, line2 begins in second position

sudo ./runMCP23017_LCD.sh -b 0x01 -a 0x21 -x 4 -r -clearLCD -t trace -line1 aaaaaa -line1Offset 4 -line2 zzzzzz -line2Offset 2

line one starts at offset 4, line two offset 2 Param -shiftL 2 shift both lines 2 positions to left