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--- software:programming:i2c:shell [2017/03/07 14:37] – admin
+++ software:programming:i2c:shell [2017/03/07 22:18] (current) – [References] admin
@@ Line 6: / Line 6: @@
 </code>
-==== Using user space via i2c ====
+===== Setting MCP23008/MCP23017 gpio in user space via i2c =====
-For mcp23017:
+==== For mcp23008 ====
+<code bash>
+# find out which i2c address the device listens to:
+i2cdetect -y 0
+# you should find 0x20
+# Set all bits from port a to output:
+i2cset -y 0 0x20 0x00 0x00
+# Write value to register GPIOA (0x09) oder OLATA (0x0A)
+# For example: for bit 0, write:
+i2cset -y 0 0x20 0x14 0x01
+</code>
+==== For mcp23017 ====
 <code bash>
 # find out which i2c address the device listens to:
@@ Line 19: / Line 35: @@
 # Write value to register GPIOA (0x12) oder OLATA (0x14)
 # For example: for bit 0, write:
-i2cset -y 0 0x20 0x12 0x01
+i2cset -y 0 0x20 0x14 0x01
+</code>
+==== Hardware detection ====
+Color table:
+^ Bit ^ mcp23008 ^ mcp23017 ^
+|  1  |  L_GRN   |   L-BLU  |
+|  2  |  L_BLU   |   L-GRN  |
+|  4  |  L_RED   |   L-RED  |
+|  8  |  R_BLU   |   R-BLU  |
+|  16 |  R_GRN   |   L-GRN  |
+|  32 |  R_RED   |   L-RED  |
+|  64 |  WHITE   |   WHITE  |
+| 128 |  HEATR   |   HEATR  |
+<code bash>
+# Detection for mcp23017:
+i2cset -y 0 0x20 0x00 0x00
+i2cset -y 0 0x20 0x14 0x01
+i2cget -y 0 0x20 0x14
+# should give 0x01 on mcp23017 and 0x00 on mcp23008
+</code>
+===== References =====
+  * [[http://www.elektronx.de/tutorials/porterweiterung-mit-mcp23017-und-i2c/]]

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