LCD_BACKLIGHTEN pin function starter kit

Eli ben porat

Hello,

We are going to use the AM335x starter kit as a refernce design for our project.

down loading the pinmux from TI web, refer that the signal "LCD_BACKLIGHTEN" output pin C12 from the CPU,

declared to mode-0 as function "MCASP0_AHCLKR_MUX0"

C12

MCASP0_AHCLKR_MUX0

LCD_BACKLIGHTEN - enable signal to backlight control circuitry

On the other hand, this pin at software package refers to as "ECAP2_IN_PWM2_OUT" used as PWM for backlight.

Please can TI experts explain this difference?

which CPU function should be use for backlight drive?

appriciate your help, waiting for answer.

Eli

0 Biser Gatchev-XID over 11 years ago

Hi Eli,

The backlight PWM is performed in the eCAP2 module. Correct pinmux for the pin is ECAP2_IN_PWM2_OUT.

0 Eli ben porat over 11 years ago in reply to Biser Gatchev-XID

Hi,

thanks for your reply, advising that starter kit AM335x PinMux file description at TI site will be fixed.

following the link. otherwise it's very unclear and confusing

GPIO Definitions

See the updated pinmux document Pin Mux Description which shows the use case columns for GPIOs.

Regards

Eli

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