====== Kard ID Format ======

Data format of I2C EEPROM which stores Kard Maker, Version, and Configuration.

^Byte number^Description^Example^
|8|Short SHA of JSON Header|de9f2c74|
|200*|JSON Header|{"org":"Prolinear/Pontech Inc.","cn":"Drive Kard","rev":A, ...}|
|48|User Data|User Defined|

*** max, null padded**

^Required Fields^
|org, cn, rev|

^Protected Fields^
|io, label|
====== Examples ======

===== Base Format =====

''{"org":"Prolinear/Pontech Inc.","cn":"Drive Kard","rev":1.0,...}''

===== ISO Kard =====

''{"io":0x1F}''

===== Drive Card =====

''{"io":0x00}''

===== Big Easy =====

''{"io":0x00,"label":["step", "dir", "en", "sleep", "ms3"],"i2cMask":0x28}''

===== DAC =====

''{"io":0x00,"spi":true}''

===== UART =====

''{"uart":true}''

===== Com Kard =====

''{"uart1a":true,"uart1b":true,"uart3b":true}''

===== 4 SD Card =====

''{"io":0x00,"spi":true,"label":["sd0", "sd1", "sd2", "sd3", "led"]}''

===== Full Example =====

''{"org":"Prolinear/Pontech Inc.","cn":"Drive Kard","rev":1.0,"email":"support@pontech.com","io":0x00,"label":["step","dir","en","sleep","ms3"]}''