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There is some strange thing about the interrupt of keypad module. Some times too slow to send the key release interrupt, using same click on keypad，but sometimes keypad interrupt comes within 100ms，sometime 1s. The problem is caused by clock source, but the keypad controller of am572x has no other clock source, so the problem still no resolved. We often purchase the Keypad Module not realising that this is a discontinued product.
Symbol MC9000, MC9090G, MC9190 Keypad Module (53 Keys) connects to CCB so reseating CCB would be next plan. Note this will be a security violation and you won't be able to play movies until you can use the keypad module to clear the error. If it has a tamper event and the projector is not usable I would check the connections to the button board.
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