Raw 2-wire

==Overview==
*'''Bus:''' general purpose 2-wire library with bitwise pin control.
*'''Connections: '''two pins (SDA/SCL) and ground.
*'''Output type:''' 3.3volt normal, or [http://en.wikipedia.org/wiki/High_impedence open collector] ([http://dangerousprototypes.com/2009/07/27/bus-pirate-practical-guide-to-pull-up-resistors/ pull-up resistors] required).
*'''Pull-up resistors: '''required for open drain output mode (2K – 10K).
*'''Maximum voltage: '''5.5volts (5volt safe).

The raw 2 wire library is similar to I2C, but it doesn’t handle acknowledge bits and it has bitwise pin control. I2C could be built using the basic elements in the raw2wire library,

==Configuration options==

'' ''

''Speed ''- high (~50kHz) and low (~5kHz).

''Output type -'' open drain/open collector (high=Hi-Z, low=ground) , normal (high=3.3volts, low=ground). Use open drain/open collector output types with pull-up resistors for multi-voltage interfacing.

==Syntax==

{| border="0"
|-
| A/a/@
| Toggle auxiliary pin. Capital “A” sets AUX high, small “a” sets to ground. @ sets aux to input (high impedance mode) and reads the pin value.
|-
| D/d
| Measure voltage on the ADC pin (v1+ hardware only).
|-
| W/w
| Capital ‘W’ enables the on-board power supplies. Small ‘w’ disables them. (v1+ hardware only).
|-
| { or [
| Issue I2C-style start condition.
|-
| ] or }
| Issue I2C-style stop condition.
|-
| r
| Read one byte. (r:1…255 for bulk reads)
|-
| 0b
| Write this binary value. Format is 0b00000000 for a byte, but partial bytes are also fine: 0b1001.
|-
| 0x
| Write this HEX value. Format is 0×01. Partial bytes are fine: 0xA. A-F can be lower-case or capital letters.
|-
| 0-255
| Write this decimal value. Any number not preceded by 0x or 0b is interpreted as a decimal value.
|-
| ,
| Value delimiter. Use a coma or space to separate numbers. Any combination is fine, no delimiter is required between non-number values: {0xa6,0, 0 16 5 0b111 0xaF}.
|-
| &amp;
| Delay 1uS. (&amp;:1…255 for multiple delays)
|-
| (#)
| Run macro, (0) for macro list
|-
| ''Bitwise''
|
|-
| ^
| Send one clock tick. (^:1…255 for multiple clock ticks)
|-
| / or \
| Toggle clock level high (/) and low (\). Includes clock delay (100uS).
|-
| - or _
| Toggle data state high (-) and low (_). Includes data setup delay (20uS).
|-
| !
| Read one bit with clock.
|-
| .
| Read data pin state (no clock).
|}

{| border="0"
==Macro==
|-
| 0
| Macro menu
|-
| 1
| ISO7813-3 ATR for smart cards, parses reply bytes.
|-
| 2
| ISO7813-3 parse only (provide your own ATR command).
|}



==Connections==