本文主要分享在ALPU加密芯片调试过程中，数据接口I2C或者单总线的读写流程是如何实现的。

ALPU 加密IIC数据读写流程

1、IIC写数据结构 见下图

S: Start
D/A:Device Address(Slave Address)7bits
W:Device Address Write bit(0)
A:Acknowledge
S/A: Sub Address
Data0~n:Write Data

P:Stop

2、IIC写数据结构
S:Start
D/A:Device Address(Slave Address)7bits
W:Device Address Write bit(0)
A:Acknowledge
S/A:Sub Address
Sr:Repeated Start(Non-Stop)
R:Device Address Read bit(1)
Data0~n:Write Data
P:Stop

ALPU加密芯片One-wire(ART)数据读写流程

1、ART写数据结构 见下图

(图) ART Write Packet Structure

AWU:ART Wake Up
ART:Adaptive Reference Time
SP:Start Preamble
D/A(W):Write Device Address
S/A: Sub Address
Data0~7:Write Data(8 Bytes)
EP:End Preamble

2、ART读数据结构见下图

图 ART read packet Structure

AWU:ART Wake Up
ART:Adaptive Reference Time
SP:Start Preamble
D/A(W):Write Device Address
S/A:Sub Address
Sr:Repeated Start
Data0~9:Write Data(10Bytes)

EP:End Preamble