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Published 20 hours ago • verified publisher icon pvvx

TLSR8251 can't read

Open bearpawmaxim opened this issue 2 years ago • 6 comments

Hi! I'm unsuccessfully trying to dump the stock firmware from Xiaomi SJWS01LM water leak sensor that has a tslr8251 chip. (I 'm going to write a custom firmware because I don't like how the stock one behaves) (I'm a newbie to TSLR* chips)

Trying to dump the firmware with the USB-uart converter. TX wire connected through 1k resistor to SWS/PA<7> (pin 4 on 24-pin package) and RX wire connected to the same SWS pin directly. RST pin is not connected (because my uart converter doesn't have one)..

The error I'm getting is Error[102] Read PGM Version and Config! What am I doing wrong? Thanks for help!

bearpawmaxim avatar Jun 25 '22 21:06 bearpawmaxim

Okay, the error means that we're receiving less bytes than expected - will check RX.

bearpawmaxim avatar Jun 26 '22 07:06 bearpawmaxim

Added logging to command function and got

Open COM4, 230400 bit/s... ok
Read bytes count less than expected! (6 < 19) bytes: 00 00 00 00 00 24!
Error[102] Read PGM Version and Config!```

bearpawmaxim avatar Jun 26 '22 08:06 bearpawmaxim

Not all types of USB-UART chips work with Telink Swire emulation. Only Chinese USB-UARTs. Not FTDI - FTDI filters invalid UART characters... The RX input of the USB-UART adapter must not have a resistor with an LED.

pvvx avatar Jun 30 '22 20:06 pvvx

I'm finished with using the stm32f103vet6 at the hardware side and tsltools825x at software side. But even with this sometimes I cannot connect to the MCU (because it is falling asleep?). I think I definitely need to solder the rst pin to be able to use the activation procedure...

bearpawmaxim avatar Jun 30 '22 20:06 bearpawmaxim

This repository is dedicated to Telink-SWire hardware programmer based on TLSR8269/825x chips... And I don't quite understand your question... Is it about a different type of programmer?

A reset or power-up signal is required to wake the chip from sleep mode.

pvvx avatar Jun 30 '22 20:06 pvvx

Upd: connected the reset line, but even with this still getting an error Error[102] Read PGM Version and Config!

And I don't quite understand your question...

The question is whether the described in the first post wiring is correct and the reason why I'm getting an error.

P.S.: with ch340g and an stm32-based adapters the result is same - error mentioned above.

bearpawmaxim avatar Jul 03 '22 13:07 bearpawmaxim