While I am likely getting in way over my head, are there any settings that can be modified on a BeagleBone black as it relates to the UART oscillator? I have seen some reference to the specification of the AM335x regarding:
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The UART modules each have a 48MHz clock to generate their timing. They can be configured in one of two modes: UART 16x and UART 13x, in which that clock is divided by 16 and 13, respectively.
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I am still trying to get an application I wrote to communicate with a 3rd party controller and grasping at straws at this point.I just can’t figure out why everything works fine when I go through /ttyUSB0 (using a USB-serial adapter), but when I try to utilize the /tty04 UART, I can’t communicate.
Without drowning this thread with every little thing I have done, I have come to the following conclusions:
- My application works because I can confirm it’s functionality when connected via USB-serial adapter
- My UART circuit (have tried with a MAX3232 and a MAX232) works because I can open up minicom and do a loopback test successfully. I have also communicated from mt BB to a Windows PC at the same baud rate that I am attempting to use with my application, so based on the fact that the manual communication between BB and PC was successful, I feel confident that my UART circuit is ok.
- Currently I have a logic analyzer hooked up and I am looking at the data I am transmitting from my BB. The applicatio I use with the analyzer decodes the protocol and the data I am seeing from my circuit is the data I am expecting to see.
This snapshot is from the USB-serial connection transmission:
This snapshot is from the UART circuit transmission:
