Explore the USB connection

[pulkin]

There are no csdk functions available, however, the module seems to support it while elf/lod contains hal_Usb* functions (signatures are here). It would be nice to implement the serial port over USB as a start.

[ens4dz]

I don't know if this help somehow: I disconnected the usb cable while burning ! after that it appear in device manager as usb device:

[ubaldus]

I could reproduce the same indeed:

[Sun Sep 20 19:51:46 2020] usb 1-4: new full-speed USB device number 19 using xhci_hcd [Sun Sep 20 19:51:46 2020] usb 1-4: New USB device found, idVendor=1e04, idProduct=0900 [Sun Sep 20 19:51:46 2020] usb 1-4: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [Sun Sep 20 19:51:46 2020] usb 1-4: Product: Coolsand [Sun Sep 20 19:51:46 2020] usb 1-4: Manufacturer: Coolsand Technologies [Sun Sep 20 19:51:46 2020] usb 1-4: SerialNumber: Host USB

[ens4dz]

the official tool be able to flash rom from usb i changed this line in download.ini located in cfg folder

[download]
8955Dnload=1
useCom=1
useUsb=1
enableUSB=1

Warning !!! it seems erase NV data

>>> cellular.get_imei()
'000000000000000'

[ens4dz]

i don't know how to get something from those lines:

https://github.com/cherryding1/RDA8955_W17.44_IDH/blob/b2b6287e8fa9a9f49b679a357b49beb1c31d821c/soft/platform/chip/boot/8809/src/boot_monitor.c#L232

https://github.com/cherryding1/RDA8955_W17.44_IDH/blob/b2b6287e8fa9a9f49b679a357b49beb1c31d821c/soft/platform/chip/boot/include/boot_usb.h#L114

[ubaldus]

well they seem to be quite interesting, KEYIN_1 is responsable to enable BOOT_MODE_FORCE_MONITOR, indeed if I bridge IO26 (GPIO_26=KEYIN_1) with RST and I plug the usb cable to the computer at least linux is detecting the new usb device! :)

[ens4dz]

Great news, so is possible now to burn python firmware to the board without USB to TTL !