[gnea/grbl-Mega Issue#46] change USART

#1 – chamnit 于 2017-11-14

Yes. You’ll need to update the macros in serial.c as well. Grbl isn’t fully configurable in the cpu map file.

#2 – Diamus 于 2018-02-08

I am trying to get a makeblock megapi to use USART3 in order connect a bluetooth module to the wireless port on the megapi. I have tried to change the serial.c to reference all the registers related to USART3 but still cannot communicate. I have reached the end of my skills after several hours of research and trying. I don’t like it but I am at a loss and asking for help.

I have attached the serial.c and cpu_map.h files:

serial.txt

#3 – Diamus 于 2018-02-13

Found the problem. I missed changing one register. Corrected it and all is well.

#4 – WD24 于 2018-02-23

Which register did you miss out?

#5 – Diamus 于 2018-02-24

Line 103 of serial.c
was
UCSR0B |= (1 << UDRIE3); should be UCSR3B |= (1 << UDRIE3); Attached is the fully corrected file. serial.c.zip