I tested the DMX512-1990 timing simulation of the stage lighting and the receiving and sending code example. It may be that my external 12M crystal oscillator cannot be configured with a better 250K baud rate, bit error rate and receiving speed.
Reference address：DMX512-1990 transceiver routine based on Nuvoton M0
A bit low.
I use the BIF interrupt of the receive line status interrupt RLS_INT to implement the BREAK reception; clear
the receive buffer. Then use the receive data mode to receive data.
In addition, it should be noted that:
1. When the baud rate is high, the serial port must have 2 stop bits to receive.
2. The TXD and RXD of UART are uncertain when they are switched from GPIO P30 and P31. It takes about 33us to switch to UART mode by sending 3 bytes of data.
3.
If PLL is used as the clock of UART, the effect is very poor. I don’t know if it is because the PLL is unstable or the baud rate generator
is unstable at high clock?
If you have any technical questions, please communicate with yuanxihua@21cn.com
.
Attachment: Test project code 9G-M0516.zip
DMX512 protocol DMX512 control protocol.rar
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