Atmelavr toolchain iom4808.h file missing USART3? #61
Description
This is a copy of the discourse thread on the same topic, I was asked to make an issue here.
Hello, I would just like to preface this with: I have no idea what I am doing and used my monkey brain pattern recognition to fix a bug. That being said, I wanted to find some closure with the bug I found and fixed (I mean it at least programs now when it didn't before).
I'll try to be as detailed as possible, but again, not sure what I'm doing so I might miss something.
What I did was create a new platformio project by selecting atmega4808 as the board.
When this project was created I then copied the jtag2updi platformio.ini from the megacorex platformio docs here.
After doing this, compiling the default sketch generated by platformio I got the following error:
In file included from C:\Users\ffejs\.platformio\packages\framework-arduino-megaavr-megacorex\cores\MegaCoreX\UART.h:28:0,
from C:\Users\ffejs\.platformio\packages\framework-arduino-megaavr-megacorex\cores\MegaCoreX\Arduino.h:127,
from C:\Users\ffejs\.platformio\packages\framework-arduino-megaavr-megacorex\cores\MegaCoreX\UART3.cpp:25:
C:\Users\ffejs\.platformio\packages\framework-arduino-megaavr-megacorex\variants\48pin-standard/pins_arduino.h:204:42: error: 'USART3' was not declared in this scope
#define HWSERIAL3 &USART3
^
There was a bit more but it was all USART3 stuff.
Control clicking through the files it listed (I'm not sure how I got to it as its not directly one listed) I got to the iom4808.h file which comes with the atmelavr toolchain. (the path is C:\Users\ffejs\.platformio\packages\toolchain-atmelavr\avr\include\avr\iom4808.h)
This file was missing:
- The memory mapping for USART3
-
#define USART3 (*(USART_t *) 0x0860)
-
- The interrupt vectors for USART3
-
#define USART3_RXC_vect_num 37 #define USART3_RXC_vect _VECTOR(37) #define USART3_DRE_vect_num 38 #define USART3_DRE_vect _VECTOR(38) #define USART3_TXC_vect_num 39 #define USART3_TXC_vect _VECTOR(39)
-
After adding that to the file on my machine everything compiles and uploads fine.
(Yes, I checked the values with the datasheet and they are correct)
I've scoured the github repo's looking for this file and was not able to locate it, as I wanted to make a github issue about this topic, so instead I've resorted to this.
Is there any reason it was missing or was it just a mistake and a bug that should be fixed?
Or am I messing with something I'm not supposed to be messing with and there was a really simple solution to my problem.