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Any way to only send an I2C address byte on STM32L4?

Andrew Sterian
Associate II

‎2019-07-21 03:06 PM

I just want to send an I2C address byte to see if there is a device on the bus that will ACK it. I don't want to send any data bytes after the address byte.

Is there any way to do this? I tried setting NBYTES[7:0] to 0 in the CR2 register but I just get an immediate NAK without any I2C bus activity.

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Pavel A.
Evangelist III

‎2019-07-21 04:09 PM

The HAL_I2C_IsDeviceReady library function does exactly this.

https://github.com/STMicroelectronics/STM32CubeL4/blob/f6877af03b5c8b666b3443f5295cf95ec9c0b15d/Drivers/STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_i2c.c#L45

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