Sonoff serial bootloader (SBL) toggle

[janmashat]

Hi, great project!

2 weeks ago I succesfully flashed cc2652p.hex by running:

docker run \
--device /dev/serial/by-id/usb-ITead_Sonoff_Zigbee_3.0_USB_Dongle_Plus_bee4...6eb0-if00-port0:/dev/ttyUSB1 \
-e FIRMWARE_URL=https://example.com/cc2652p.hex \
ckware/ti-cc-tool \
-ewv \
-p /dev/ttyUSB1 \
--bootloader-sonoff-usb

Now I tried to upgrade to the new 2022-07-21 version by running the same command, however it failed with:

Downloading firmware from https://example.com/cc2652p.hex
Firmware file:   'cc2652p.hex'
sonoff
Opening port /dev/ttyUSB1, baud 500000
Reading data from cc2652p.hex
Your firmware looks like an Intel Hex file
Connecting to target...
ERROR: Timeout waiting for ACK/NACK after 'Synch (0x55 0x55)'

Is it possible that the config in cc2652p.hex isn't compatible with --bootloader-sonoff-usb?

If that's the case, can it be added? And in the meantime I assume I'll need to open the case and hold some buttons to invoke SBL?

[ptvoinfo]

Hi,

Unfortunately, it is a mistake to use cc2652p.hex without configuration. It is a template only. SBL is not active there. Now, you need a XDS110 or similar JTAG flasher to upload a new firmware.

[janmashat]

Oh no 😞 even the cheapest c/JTAG flasher (CC-DEVPACK-DEBUG) is almost twice as expensive as the dongle itself - so I would rather get a couple more zigbee dongles. It seems I'm not the only one to make this mistake so a disclaimer in the README might help future visitors 😉

[janmashat]

Actually I found a bunch more people making the same mistake here - wouldn't it make sense to enable SBL in the template hex?

[ptvoinfo]

It is useless because the SBL pin should be configured too, and it may change for different boards.

I've updated README and added this caution.

[janmashat]

Isn't DIO_15 the default SBL pin for CC2652P? At least that's what it seems to be according to this table.

[ptvoinfo]

Currently, SBL isn't activated at all in the template HEX file. Sorry.

[janmashat]

I understand - I'm suggesting to activate it in order to make it easier for others in the future.

[ptvoinfo]

@janmashat Probably good new for you. SBL is enabled in the firmware, but the SBL function does not use any pins to activate it (Auto BSL). I know, there is a method to start flashing a firmware without pulling a pin. But I didn't try it myself yet.

https://community.home-assistant.io/t/iteads-sonoff-zigbee-3-0-usb-dongle-plus-model-zbdongle-p-based-on-texas-instruments-cc2652p-20dbm-radio-mcu-now-sold-for-14-99/340705/111