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keybrd
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keybrd library is an open source library for creating custom-keyboard firmware.
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keybrd/examples/keybrd_MCP23017/keybrd_MCP23017.ino

keybrd_MCP23017.ino 610B
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  1. /* keybrd_MCP23017.ino

  2. 

  3. MCP23017 pin assignments

  4. DESTINATION  PIN PIN_NUMBER  PIN   DESTINATION

  5.      row0    GPB0  1     28 GPA7

  6.      row1    GPB1  2     27 GPA6

  7.              GPB2  3     26 GPA5

  8.              GPB3  4     25 GPA4

  9.              GPB4  5     24 GPA3

  10.              GPB5  6     23 GPA2

  11.              GPB6  7     22 GPA1    col1

  12.              GPB7  8     21 GPA0    col0

  13.      LC 3.3V VDD   9     20 INTA

  14.      GND     VSS  10     19 INTB

  15.               NC  11     18 /RESET   VDD

  16.      LC 19   SCL  12     17 A2       GND

  17.      LC 18   SDA  13     16 A1       GND

  18.               NC  14     15 A0       GND

  19. 

  20. */