--- /dev/null
+-------------------------------------------------------------------------------
+Nintendo Wii Nunchuk controller
+-------------------------------------------------------------------------------
+
+This is a collection of example captures of I2C traffic from/to a Nintendo
+Wii Nunchuk game controller.
+
+A Dangerous Prototypes Buspirate (v4) was used as I2C master to talk to the
+Nunchuk controller.
+
+Details:
+https://en.wikipedia.org/wiki/Wiimote#Nunchuk
+http://wiibrew.org/wiki/Wiimote/Extension_Controllers/Nunchuck
+http://dangerousprototypes.com/docs/Bus_Pirate
+http://dangerousprototypes.com/2009/08/19/bus-pirate-wii-nunchuck-quick-guide/
+
+
+Logic analyzer setup
+--------------------
+
+The logic analyzer used was a Saleae Logic (at 1MHz):
+
+ Probe I2C pin
+ -------------------
+ 3 (red) SCL
+ 7 (blue) SDA
+
+
+Buspirate setup
+---------------
+
+Connections:
+
+ Buspirate Nunchuk I2C breakout adapter
+ ----------------------------------------
+ GND - (GND)
+ +3.3 + (VCC)
+ MOSI d (SDA)
+ CLK c (SCL)
+
+The basic setup after connecting to the Buspirate on /dev/ttyACM0
+(115200, 8n1) via minicom was:
+
+ HiZ>m (mode)
+ (1)>4 (I2C)
+ (1)>2 (I2C mode: hardware)
+ (1)>1 (speed: 100kHz)
+ I2C>W (enable Buspirate power supplies)
+
+See below for further per-file I2C commands used.
+
+
+sigrok
+------
+
+The sigrok command line used was:
+
+ sigrok-cli -d fx2lafw:samplerate=1mhz --time <ms> \
+ -p '3=SCL,7=SDA' -o <filename>
+
+The <ms> and <filename> parameters vary depending on the file.
+
+
+wii_nunchuk_init.sr
+-------------------
+
+I2C>[0xa4 0x40 0x00]
+I2C START BIT
+WRITE: 0xA4 ACK
+WRITE: 0x40 ACK
+WRITE: 0x00 ACK
+I2C STOP BIT
+
+
+wii_nunchuk_set_reg.sr
+----------------------
+
+I2C>[0xa4 0x00]
+I2C START BIT
+WRITE: 0xA4 ACK
+WRITE: 0x00 ACK
+I2C STOP BIT
+
+
+wii_nunchuk_data_idle.sr
+------------------------
+
+No buttons were pressed, the analog stick was not moved.
+
+I2C>[0xa5 r:6]
+I2C START BIT
+WRITE: 0xA5 ACK
+READ: 0x74 ACK 0x7F ACK 0x7B ACK 0x20 ACK 0x7D ACK 0xC7
+NACK
+
+
+wii_nunchuk_data_left.sr
+------------------------
+
+No buttons were pressed, the analog stick was moved to the left.
+
+I2C>[0xa5 r:6]
+I2C START BIT
+WRITE: 0xA5 ACK
+READ: 0x12 ACK 0x7C ACK 0x48 ACK 0x2C ACK 0x97 ACK 0x2F
+NACK
+I2C STOP BIT
+
+
+wii_nunchuk_data_right.sr
+-------------------------
+
+No buttons were pressed, the analog stick was moved to the right.
+
+I2C>[0xa5 r:6]
+I2C START BIT
+WRITE: 0xA5 ACK
+READ: 0xD6 ACK 0x61 ACK 0x4E ACK 0x28 ACK 0x93 ACK 0x2B
+NACK
+I2C STOP BIT
+
+
+wii_nunchuk_data_top.sr
+-----------------------
+
+No buttons were pressed, the analog stick was moved to the top.
+
+I2C>[0xa5 r:6]
+I2C START BIT
+WRITE: 0xA5 ACK
+READ: 0x74 ACK 0x7E ACK 0x8E ACK 0x70 ACK 0x48 ACK 0x97
+NACK
+I2C STOP BIT
+
+
+wii_nunchuk_data_bottom.sr
+--------------------------
+
+No buttons were pressed, the analog stick was moved to the bottom.
+
+I2C>[0xa5 r:6]
+I2C START BIT
+WRITE: 0xA5 ACK
+READ: 0x75 ACK 0x19 ACK 0x43 ACK 0x2F ACK 0x65 ACK 0xA3
+NACK
+I2C STOP BIT
+
+
+wii_nunchuk_button_c.sr
+-----------------------
+
+The C button was pressed.
+
+I2C>[0xa5 r:6]
+I2C START BIT
+WRITE: 0xA5 ACK
+READ: 0x75 ACK 0x7F ACK 0x70 ACK 0x56 ACK 0x9F ACK 0xED
+NACK
+I2C STOP BIT
+
+
+wii_nunchuk_button_z.sr
+-----------------------
+
+The Z button was pressed.
+
+I2C>[0xa5 r:6]
+I2C START BIT
+WRITE: 0xA5 ACK
+READ: 0x75 ACK 0x7F ACK 0x80 ACK 0x78 ACK 0x64 ACK 0x6C
+NACK
+I2C STOP BIT
+
+
+wii_nunchuk_orientation_vertical_top.sr
+---------------------------------------
+
+The Nunchuk was in vertical ("normal") position.
+
+I2C>[0xa5 r:6]
+I2C START BIT
+WRITE: 0xA5 ACK
+READ: 0x75 ACK 0x7F ACK 0x81 ACK 0x78 ACK 0x63 ACK 0x5F
+NACK
+I2C STOP BIT
+
+
+wii_nunchuk_orientation_vertical_bottom.sr
+------------------------------------------
+
+The Nunchuk was in vertical position, help upside-down.
+
+I2C>[0xa5 r:6]
+I2C START BIT
+WRITE: 0xA5 ACK
+READ: 0x75 ACK 0x7F ACK 0x71 ACK 0x83 ACK 0x5D ACK 0xD3
+NACK
+I2C STOP BIT
+
+
+wii_nunchuk_orientation_horizontal_left.sr
+------------------------------------------
+
+The Nunchuk was in horizontal position, pointing to the left.
+
+I2C>[0xa5 r:6]
+I2C START BIT
+WRITE: 0xA5 ACK
+READ: 0x75 ACK 0x7F ACK 0x25 ACK 0x7E ACK 0x7B ACK 0xEB
+NACK
+I2C STOP BIT
+
+
+wii_nunchuk_orientation_horizontal_right.sr
+-------------------------------------------
+
+The Nunchuk was in horizontal position, pointing to the right.
+
+I2C>[0xa5 r:6]
+I2C START BIT
+WRITE: 0xA5 ACK
+READ: 0x75 ACK 0x7F ACK 0x8F ACK 0x7E ACK 0x75 ACK 0x4B
+NACK
+I2C STOP BIT
+
+
+wii_nunchuk_init_reg_3xdata.sr
+------------------------------
+
+I2C>[0xa4 0x40 0x00]
+I2C START BIT
+WRITE: 0xA4 ACK
+WRITE: 0x40 ACK
+WRITE: 0x00 ACK
+I2C STOP BIT
+
+I2C>[0xa4 0x00]
+I2C START BIT
+WRITE: 0xA4 ACK
+WRITE: 0x00 ACK
+I2C STOP BIT
+
+I2C>[0xa5 r:6]
+I2C START BIT
+WRITE: 0xA5 ACK
+READ: 0x75 ACK 0x7F ACK 0x77 ACK 0x4F ACK 0x82 ACK 0x3B
+NACK
+I2C STOP BIT
+
+(for the above values, no button was pressed)
+
+I2C>[0xa4 0x00]
+I2C START BIT
+WRITE: 0xA4 ACK
+WRITE: 0x00 ACK
+I2C STOP BIT
+
+I2C>[0xa5 r:6]
+I2C START BIT
+WRITE: 0xA5 ACK
+READ: 0x75 ACK 0x7F ACK 0x75 ACK 0x44 ACK 0x82 ACK 0x34
+NACK
+I2C STOP BIT
+
+(for the above values, the Z button was pressed)
+
+I2C>[0xa4 0x00]
+I2C START BIT
+WRITE: 0xA4 ACK
+WRITE: 0x00 ACK
+I2C STOP BIT
+I2C>[0xa5 r:6]
+I2C START BIT
+WRITE: 0xA5 ACK
+READ: 0x75 ACK 0x7F ACK 0x77 ACK 0x43 ACK 0x83 ACK 0x5D
+NACK
+I2C STOP BIT
+
+(for the above values, the C button was pressed)
+
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