ravedude serial console does not show any output on windows

[RandoSY]

This is a great project, thanks for posting!

Very new to rust, but amazed how easy to get setup and testing. Seem to be building OK, but wondering where to set/place -P to COM12 statement, I've been using the RAVEDUDE_PORT env variable clumsily from the command line to get it flashing OK.

Here's a Windows 11 run, that hangs with no serial output from UNO seen.

C:\Users\randa\Desktop\avr-hal-main\examples\arduino-uno>cargo run --bin uno-i2cdetect Finished dev [optimized + debuginfo] target(s) in 0.12s Running ravedude uno -cb 57600 C:\Users\randa\Desktop\avr-hal-main\target\avr-atmega328p\debug\uno-i2cdetect.elf Board Arduino Uno Programming C:\Users\randa\Desktop\avr-hal-main\target\avr-atmega328p\debug\uno-i2cdetect.elf => COM12

avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.00s

avrdude: Device signature = 0x1e950f (probably m328p) avrdude: erasing chip avrdude: reading input file "C:\Users\randa\Desktop\avr-hal-main\target\avr-atmega328p\debug\uno-i2cdetect.elf" avrdude: writing flash (1600 bytes):

Writing | ################################################## | 100% 0.04s

avrdude: 1600 bytes of flash written avrdude: verifying flash memory against C:\Users\randa\Desktop\avr-hal-main\target\avr-atmega328p\debug\uno-i2cdetect.elf: avrdude: load data flash data from input file C:\Users\randa\Desktop\avr-hal-main\target\avr-atmega328p\debug\uno-i2cdetect.elf: avrdude: input file C:\Users\randa\Desktop\avr-hal-main\target\avr-atmega328p\debug\uno-i2cdetect.elf contains 1600 bytes avrdude: reading on-chip flash data:

Reading | ################################################## | 100% 0.03s

avrdude: verifying ... avrdude: 1600 bytes of flash verified

avrdude: safemode: Fuses OK (E:00, H:00, L:00)

avrdude done. Thank you.

Programmed C:\Users\randa\Desktop\avr-hal-main\target\avr-atmega328p\debug\uno-i2cdetect.elf Console COM12 at 57600 baud

---

There it hangs and I don't see any output from the port. TeraTerm has same results.

Ideas?

[RandoSY]

I just noticed....

avrdude: safemode: Fuses OK (E:00, H:00, L:00)

???

[Rahix]

Hm, just to rule out any oddities; did you try the uno-usart example?

avrdude: safemode: Fuses OK (E:00, H:00, L:00)

Yeah, we don't program the fuses right now... Try flashing a program with Arduino IDE first to set them, just in case.

[RandoSY]

Thank you for the kind consideration of your prompt reply!

I know from hard won experience to get on a good, stable Ubuntu 20.04 machine for testing.

Once I had jumped through all the hoops to install rust, and ravedude, it runs like a champ on a low cost UNO clone. So excited to bring this sophisticated software technology to the Arduino hardware platform!

Programmed /home/rasyoung/Codetest/AVR/Rust AVR/avr-hal-main/target/avr-atmega328p/debug/uno-i2cdetect.elf

 Console /dev/ttyUSB0 at 57600 baud

Write direction test:

• 0 1 2 3 4 5 6 7 8 9 a b c d e f 00: -- -- -- -- -- -- -- -- -- -- -- -- -- -- 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 50: -- -- -- -- -- -- -- 57 -- -- -- -- -- -- -- -- 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 70: -- -- -- -- -- -- -- --

Read direction test:

• 0 1 2 3 4 5 6 7 8 9 a b c d e f 00: -- -- -- -- -- -- -- -- -- -- -- -- -- -- 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 50: -- -- -- -- -- -- -- 57 ^Z [2]+ Stopped cargo run --bin uno-i2cdetect

Begs the question what slight irregularity is keeping the Windows 11 console from working properly?

[Rahix]

Maybe related to https://github.com/Rahix/avr-hal/issues/176?

[Linus-Schwarz]

This seems to be an issue with serialport: When changing the buffer size from 4098 to 1 solved the problem for me. console.rs, line 24: let mut buf = [0u8; 4098]; Might not be the most efficient solution, maybe adding a cli argument to determine the buffer size could be an option.

[Rahix]

How about #[cfg(target_os = "windows")] (not sure what the exact cfg line was) for the single-byte buffer? Can you send a PR?

[Linus-Schwarz]

Seems good, did exactly that in #433

[Rahix]

Fixed by #433.