DS90UB953-Q1: DS90UB953 GPIO_PIN_STS reading

Torsten Dr. Kilias

Part Number: DS90UB953-Q1

Hi,

I tried to detect the logic level at GPIO[3:0] via reading GPIO_PIN_STS register 0x53 (that should be independent GPIO configuration).

I always read a 0x00 despite of having H potential at GPIO pins.

What could go wrong?

Regards

Torsten

0 Casey McCrea over 4 years ago

Hello Torsten,

Is it possible that you have the GPIOs set as outputs? It is a known documentation issue that GPIO_STS does not update when the GPIOs are configured as outputs: https://e2e.ti.com/support/interface/f/138/t/735431?Linux-DS90UB953-Q1-GPIO-Status-Register-Not-Changing

0 Torsten Dr. Kilias over 4 years ago in reply to Casey McCrea

Hello Casey,

I exactly did this:

SER953 0x0D = 0x4b GPIO2 = FSIN remote; GPIO3 = PWR_ENn = RST = local High
SER953 0x0E = 0xf0 GPIO[3:0] set to output

Thanks a lot - problem solved.

Regards

Torsten

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