I was trying to upload a blinky code to the bluepill dev board and got failed.
I got the following output on terminal.
Linking .pio/build/bluepill_f103c8/firmware.elf
Checking size .pio/build/bluepill_f103c8/firmware.elf
Advanced Memory Usage is available via "PlatformIO Home > Project Inspect"
RAM: [ ] 4.1% (used 844 bytes from 20480 bytes)
Flash: [== ] 15.1% (used 9928 bytes from 65536 bytes)
Building .pio/build/bluepill_f103c8/firmware.bin
Configuring upload protocol...
AVAILABLE: blackmagic, cmsis-dap, dfu, jlink, mbed, serial, stlink
CURRENT: upload_protocol = serial
Looking for upload port...
Auto-detected: /dev/ttyUSB0
Uploading .pio/build/bluepill_f103c8/firmware.bin
Failed to init device.
stm32flash Arduino_STM32_0.9
http://github.com/rogerclarkmelbourne/arduino_stm32
Using Parser : Raw BINARY
Interface serial_posix: 115200 8E1
*** [upload] Error 1
how to fix this