I2C and BLE on the STM32WB05

[nama]

Hi, all
I'm developing a BLE device using the STM32WB05 that supports I2C and BLE connections.

I successfully established an I2C connection using I2C_SCL(PB6) and I2C_SDA(PB7).
However, PB7 is used for RADIO_RF_ACTIVITY on BLE, causing a conflict between BLE and I2C.
Therefore, I tried changing to I2C_SCL(PA0) and I2C_SDA(PB14) to connect to the I2C master, but the connection failed.

I'm wondering if the I2C pins on the STM32WB0 are limited to only PB6 and PB7.

thanks.

[STTwo-32]

Hello @nama 

According to the table 6, table 7 and table 8 of the DS14591,  I2C1_SDA and I2C_SCL are available on PA0, PB6 for I2C1_SDA and PA1, PB7 for I2C_SCL. The PB14 is used for I2C1_SMBA signal.

Best Regards.

STTwo-32

[Andrew Neil]

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@nama wrote:

I successfully established an I2C connection using I2C_SCL(PB6) and I2C_SDA(PB7).

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So you're using I2C1, then:

 

 

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@nama wrote:

I tried changing to I2C_SCL(PA0) and I2C_SDA(PB14) .

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As @STTwo-32 said, There is no I2C_SDA on PB14:

You need PA0 and PA1: