am335x tps65217c mux_out check

Ahn

Intellectual 1000 points

I would like to check the mux_out value.

I tested while changing the mux control register.

But mux_out value is always low.

Are there any s/w check point?

Please check my schematics.

My environment :

linux-3.14.26-g2489c02

over 9 years ago

0 Biser Gatchev-XID over 9 years ago

TI__Guru**** 393215 points

Hi,

There is no software means of reading the MUX_OUT value, unless this pin is connected to the AM335X ADC. What values do you set to the TPS65217C MUXCTRL register? Do you write to the correct internal address 0x09?

0 Ahn over 9 years ago in reply to Biser Gatchev-XID

Intellectual 1000 points

After setting the MUXCTRL register to 0x01 or 0x02, MAX_OUT was measured with an oscilloscope.

0 Biser Gatchev-XID over 9 years ago in reply to Ahn

TI__Guru**** 393215 points

I can't see any reason for this behavior. Did you readback the values you set to the MUXCTRL register to confirm that they are actually written? I suggest you also ask on the PMIC forum for possible reasons for this behavior: e2e.ti.com/.../200

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am335x tps65217c mux_out check