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i2c

Hi, how are you? Im having trouble trying to communicate an external sensor with the audiomoth using i2c protocol. I dont know what pins to use as SDA and SCL, and how to use them. Also, I cannot find the part in the code where you connect the sda to the particular output pin. Do you have any example or something as a guide? Besides the Alternative firmware and applications that are in this page. Thank you! I leave my mail just in case lucasdiazmiguez@gmail.com

3 comments

3 Comments

Alex Rogers

Mar 18, 2024

Hi Lucas, There is a hardware supported UART on the GPIO pins but no hardware supported I2C. As a way around this, you could implement I2C through bit-banging on any of the GPIO pins, or through a UART to I2C bridge such as this - https://www.nxp.com/docs/en/data-sheet/SC18IM704.pdf. We haven't tried either approach to date. There is a good example of I2C bit-banging here - https://calcium3000.wordpress.com/2016/08/19/i2c-bit-banging-tutorial-part-i/, It's for a different chip but the idea will be the same. Alex

Edited

Lucas Diaz Miguez

Mar 21, 2024

Replying to

Thanks! I will look into it this weekend. In the meantime, do you have any example of how to create a clock or an example of how to set the pins? Also, I have the audiomoth 1.2. The audimoth DEV has i2c hardware suport? Thanks!

Alex Rogers

Mar 21, 2024

Replying to

The AM Dev is identical to AM 1.2 and has no I2C support.

The application note from Silicon Labs describes the use of the GPIO on the EFM32 microcontroller. If you compare to the audiomoth.c library code, you'll see that we use the same EMLib calls to control the microcontroller pins. https://www.silabs.com/documents/public/application-notes/an0012-efm32-gpio.pdf