CH340, Cannot read any bytes

[yy8855343]

I am trying convert esptool.py to android. For serial communication, I am using this library.

From https://github.com/espressif/esptool/wiki/Serial-Protocol, We can send command bytes to esp8299 while bootloader mode.

My project is working well with esp8266/cp2102, esp8266/ftdi. But not working with esp8266/ch340.

Strange: With esp8266/ch340, read/write is working well in normal mode(not bootloader mode).

but, at bootloader mode, I can read only Boot-Rom-log

For read boot-rom-log, I need buadrate 74880. So I merged https://github.com/kai-morich/usb-serial-for-android code to this project.

With esp8266/ch340, if I make it bootloader mode, the I can read Boot-Rom-log.

But after, I cannot read any bites from that. From https://github.com/espressif/esptool/wiki/Serial-Protocol, if I write sync bytes, then the esp8266 send response bytes.

More Strange After write sync bytes, I can read Response Bytes from esp8266/ch340 with disconnect it from android phone. At moment while disconnecting, the response bytes are arrived.

Or, I can read Response Bytes while reboot esp8266/ch340 via RST button.

More Details are mentioned in StackOverflow.

[felHR85]

@WangLiang85 Maybe you should ask in the other library issue tracker. This is only for issues related with this library

[yy8855343]

As I mentioned, I am using this library.