Can anyone provide some reference or sample regarding i2c slave bitbang implementation in stm32

[JMP.1]

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[Foued_KH]

Hello @JMP.1​ ,

You can refer to the I2C WIKI : Getting started with I2C - stm32mcu

Hope my answer helped you!

Foued

[JMP.1]

thanks for your reply, this post is helpful when iam doing this i2c with hardware module support. i need to implement software i2c for slave

[Foued_KH]

Hello @JMP.1​ ,

Please check this link . It will help you to implement software I2C for slave.

Foued

[S.Ma]

I tried, using Timer and EXTI. It barely works at 200kHz if there is no other interrupt in the STM32.

So my piece of advice: Keep away from trying this.

[JMP.1]

Could you please share that code, i can just try atleast

[S.Ma]

Well, you have been warned.. STM32F437 code extract. EXTI on both SDA and SCL, plus a slave state machine interrupt based to grasp the I2C bus bit events, and a spy which put in BV (SW fifo) all the I2C seen events as an ASCII String.

[S.Ma]

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[S.Ma]

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[S.Ma]

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[S.Ma]

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[S.Ma]

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[S.Ma]

Done.

[InsignificantBit]

You might want to look at the AN4655 - "Virtually increasing the number of serial communication peripherals in STM32 applications".

Obviously, there are numerous open source libraries written by people not affiliated with ST that serve this purpose and available on GitHub and elsewhere.