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adafruit / Adafruit_nRF52_Arduino

Adafruit code for the Nordic nRF52 BLE SoC on Arduino
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[Bug]Feather NRF52840 Serial USB #359

Closed ericlangel closed 4 years ago

ericlangel commented 4 years ago

Serial (USB) works with: Arduino IDE Tera Term

but it didn't work with HTerm and BlHeliSuite (sends and receive Serial Data to/from selected COM)

So, i'am not sure why some Terminals work and others not? Where is the secret?

To Reproduce Steps to reproduce the behavior: Serial communication with HTERM...just a "hello" every second

Expected behavior Nothing....no received Data With Arduino IDE Monitor or Tera Term the "hello" will be displayed

For our Application the Feather NRF52840 has to work with BlheliSuite

hathach commented 4 years ago

did your hterm terminal work with any other CDC of other mcu such as samd21/samd51 core ?

ericlangel commented 4 years ago

cant test it. The NRF52840 is my first MCU with internal USB

i looked at the adafruit code and saw that DTR has to be enabled for USB communication. I will try to activate DTR (flow control) in HTerm.

But, i cant enable it in BlHeliSuite because its from another vendor. I just have to use it.

What would happen i the DTR Request in the Ada Code would return True at any Time?

bool tud_cdc_n_connected(uint8_t itf) { // DTR (bit 0) active is considered as connected

//return tud_ready() && tu_bit_test(_cdcd_itf[itf].line_state, 0);

return TRUE; }

hathach commented 4 years ago

you dont have to enable any flow control, it is standard windows cdc kernel driver, unless your terminal decide to set it manually to not connected. I don't think I could help with this issue, I don't even consider it is a valid issue for nrf52840 either. You should contact the vendor terminal to fix this.

ericlangel commented 4 years ago

i got a special version of the Terminal from Vendor with enabled DTR Signal. Now the Serial on NRF52840 works fine.

So my conclusion: the Serial functions needs active DTR Signal.

Without DTR Signal the Serial functions on NRF52840 doesn't work. For me this is a Bug.