GPIO interrupt issue in AM335x

x10

Hi,

I try to use gpio as interrupt input line in AM335x based system. Please let me know the minimum width of input pulse which can fire GPIO interrupt. Thanks!

Cheng Shi

emtronix

over 12 years ago

0 Biser Gatchev-XID over 12 years ago

TI__Guru**** 393215 points

Hi Cheng,

GPIO interrupt can be configured to be edge sensitive. Please check section 25.3.3 in the AM335X TRM, Rev.I.

0 x10 over 12 years ago in reply to Biser Gatchev-XID

Intellectual 765 points

Hi, Biser

If GATINGRATIO in GPIO_CTRL Register is set 0, then function clock is the interface clock according to TRM. Suppose the UART_CLK in Fig 8-11 refers to interface clock which means UART ICLK = 48MHz. Is that right?

Thanks for your reply.

Cheng Shi

emtronix

0 Biser Gatchev-XID over 12 years ago in reply to x10

TI__Guru**** 393215 points

UART functional clock is 48MHz indeed. UART interface clock is 100MHz. For the GPIO functional/interface clock you have to refer to Table 25-3 - it's 100MHz. Please note that these are maximum values and depend on the corresponding source PLL settings.

0 x10 over 12 years ago in reply to Biser Gatchev-XID

Intellectual 765 points

Thank you very much :-D

Cheng Shi

Processors

Processors forum

GPIO interrupt issue in AM335x