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LCD backlight control using PWM/CAP pin in OMAP L138/AM18XX

Hi,

 

I am working on AM1808 processor, I have designed my LCD back-light with the below pin mux configuration.

 

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I have configured ECAP2 & EPWM0 (#define PWM_DEVICE_ID          "ehrpwm.0" &&  #define PWM_DEVICE_ID  "ecap.2")

 

two configuration, but it is not working. This ECAP2 & EPWM0 pin we are controlling with LCD backlight. But at the boot time

 

I need the uboot configuration and also where I need to configure it in kernel. Please find my LCD pwm driving circuit

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Please need your suggestions to enable the LCD backlight using pwm or ecap.. 

 

Thanks,

Francis


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