Marisa Alves

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4 years, 8 months ago.

SPI MOSI Voltage Level

Hello,

I am creating an aplication with Hexiwear as an SPI Master. I am using mbed os 5 and mbed studio.

My problem is that the voltage level of my MOSI line is set to a logic 1 of arroun 1.2V. Shoulldn't it be 3.3V like the clock? Is there any way I can change the voltage to 3.3V?

Bellow a screen shot of 3 bytes sent from Hewiwear to the SPI slave. In Red the MOSI line and in yellow is the clock.

/media/uploads/MarisaAlves/teste_readid_hexiwear.png

Thank you.

1 Answer

Bill Bellis
4 years, 8 months ago.

Something else is wrong. There is no setting for the voltage. It should be 3.3V

Accepted Answer

Thank you Bill.

Do you know how can I fix this?

Thank you.

posted by Marisa Alves 26 Aug 2019