So it was around May 12 when I started playing with MCP23S17.
MCP23S17 board assembly notes Sunday, May 12, 2013
http://tlfong01.blogspot.hk/2013/05/mcp23s17-board-assembly-notes.html
Now I am thinking of playing with SPI MCP23S17. Months ago I started with MCP23008 and MCP23017 I2C and find them interesting. But later I played with Guzunty Pi which uses SPI, and therefore a bit awkard to integrate with I2C MCP23017.
So I am now reading the datasheet again.
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