STM32_IIC协议编程

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最后更新：2022-05-23 14:36:21 手机定位技术交流文章

前言

IIC子函数

IIC_Start

IIC_Stop

IIC_Wait_Ack

IIC_ACK

IIC_NACK

IIC_Send_Byte

IIC_Read_Byte

AT24C02 分功能

WriteOneByte

ReadOneByte

AT24C02_Check

前言：

在数据传输期间,I2C总线产生三种信号:启动信号、终端信号和响应信号。

启动信号:SCL高,SDA从高向低,数据正在发送。

终端信号:SCL高空,自失能系统从低到高到终端数据传输

反应信号:收到8比特数据后,接收者IC将特定低高度脉冲传送到发送IC,信号接收。

当SSCL是免费和高, 数据传输开始。

SDA有一个低ACK(启动)和一个高NACK(停止)。

IIC子函数

START CONDITION: A high-to-low transition of SDA with SCL high is a start condition

which must precede any other command

SSL高空和自失能装置高到低转换是一个起始条件,必须先有任何其他命令。

IIC_Start

STOP CONDITION: A low-to-high transition of SDA with SCL high is a stop condition.

After a read sequence, the stop command will place the EEPROM in a standby power

mode。

停止条件:在 SCL 将自失能装置从低到高转换为高是一个停止条件。停止指令,并在读取序列后将EEPROM置于备用动力模式中。

IIC_Stop

IIC_Wait_Ack

ACKNOWLEDGE: All addresses and data words are serially transmitted to and from

the EEPROM in 8-bit words. The EEPROM sends a “0” to acknowledge that it has

received each word. This happens during the ninth clock cycle.

ACKNODLATION: 将所有地址和数据单词传送到 EEPROM 时共使用了8个字串。 EEPROM 在第九钟周期内传送0个字,以表明它收到每个单词。

ACK 和 NACK 信号

ACKNOWLEDGE: All addresses and data words are serially transmitted to and from

the EEPROM in 8-bit words. The EEPROM sends a “0” to acknowledge that it has

received each word. This happens during the ninth clock cycle.

ACKNODLATION: 将所有地址和数据单词传送到 EEPROM 时共使用了8个字串。 EEPROM 在第九钟周期内传送0个字,以表明它收到每个单词。

因此,短链氯化石蜡从低升到高,自失能装置降低到ACK,自失能装置增加到NACK。