Problem with a Serial Port connection

PlatformIO IDE
1

Hi. I’m trying to get Marlin uploaded to Ender 3 printer. I followed a tutotial and the project builds just fine, but fails completely when I try Upload. In platformio.ini I set upload_port = /dev/ttyUSB0 as specified here. I use a mac. Any idea why the upload would fail? If I click on Serial Monitor it says Miniterm on /dev/cu.usbmodem14401 250000,8,N,1 --. Thanks

2

Seems like you’re running into the same problem as in Ender 3 (Pro) Marlin 2.0 Upgrade - Updated Version - YouTube, aka no bootloader installed on the chip.

Try using the procedure above or flash the firmware using an Arduino Uno (or other Arduino AVR board) as a “Arduino as ISP” programmer (https://howchoo.com/g/mge1mdfkzjv/ender-3-bootloader-firmware-update-marlin). Either via the Arduino IDE or PIO as per docs.

3

Thanks for the suggestion. I was trying to flash it as you suggest before, but was suggested that BTT SKR Mini E3 V1.2 already comes with a bootloader on.

4

According it its schematic that is a STM32F103RC based printer board. You originally posted

which is (according to the schematics) an Atmel ATMega1284P based printer.

Which printer do you have?

5

It’s Ender 3 but the board has been replaced with BTT SKR Mini E3.

6

So that was very crucial information.

What Marlin repository and branch are you using with what environment and config files?

7

I’m using MarlinFirmware/Marlin/tree/bugfix-2.0.x. Here’s my platformio.ini and Configuration.h.

I’m on a Mac, using the PlatformIO IDE v1.10.0.

8

Why’d you choose

default_envs = LPC1768

which is for an NXP LPC1768 chip, shouldn’t that be a STM32F103RC_btt_XXX like environment?

9

I’ve followed this tutorial. I tried using STM32F103RC_btt_512K but it didn’t work.

10

Re- boot loader . Trying to upload onto MKS GEM L v1.0 is a book loader needed ? . Becoming confused, it’s a SERIAL PORT identified as ( com3 ) , not a USB PORT identified as( com 3 )