I create very specialized OpenWRT based firmware for RB411 and I have some difficulty with controlling board beeper and user’s LEDs to indicate device state. As I can understand from discussion “RB411 how to drive user leds” (https://forum.openwrt.org/viewtopic.php?id=24659) user’s LEDs controlled via Xilinx CPLD IC. Further I assume that beeper also controlled via this IC but not directly via CPU GPIOs. After several hours of googling I came here with my question.
The question is: how can I control board beeper (this is primary goal) and user’s LEDs? Is any sort of documentation or reference code available?