README.md

*

* -

* #%L

* **********************************************************************

* ORGANIZATION : Pi4J

* PROJECT : Pi4J :: EXTENSION

* FILENAME : README.md

*

* This file is part of the Pi4J project. More information about

* this project can be found here: https://pi4j.com/

* **********************************************************************

* %%

* * Copyright (C) 2012 - 2022 Pi4J

* %%

*

* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

*

* http://www.apache.org/licenses/LICENSE-2.0

*

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

* #L%

*

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. ./mvnw 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