GPIO interrupt problem?

Aking Jin

hi,

what will be if the high level of the GPIO3_8 which would triggle the interrupt was lower than 1.8V, for instance, 1.3V,1.4V, 1.5v etc..? would it triggle ?

Thanks.

over 12 years ago

0 Biser Gatchev-XID over 12 years ago

TI__Guru**** 393215 points

Hi Aking,

Please check AM335X Datasheet, Table 3-7 on page 86. The voltage domain for GPIO3_8 is VDDSHV6.

0 Aking Jin over 12 years ago in reply to Biser Gatchev-XID

Intellectual 465 points

Biser,

I have configured the GPIO3_8 as input ,which is pull high, I measure it use multimeter,found it 1.4v, in the AM335x Datasheet, 1.4v belong to high level in VDDSHV6 , in the program ,I read it out ,found it is 0, not 1, what's the matter?

I have the following test, configure the gpio3_8 as output ,

1.configure the GPIO high, the multimeter measure it out 1.8v.

2.configure the GPIO low, the multimeter measure it out 0.0v

it seems to be right.what's matter with the input function?

Thanks.

0 Biser Gatchev-XID over 12 years ago in reply to Aking Jin

TI__Guru**** 393215 points

Check whether you have pulldown enabled on this pin.

0 Aking Jin over 12 years ago in reply to Biser Gatchev-XID

Intellectual 465 points

Biser,

I have misoperated the GPIO pull up/down and rxactive function.

Tks.

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GPIO interrupt problem?