a new protocol of china fast power charger spec. UFCS.

[392625227]

a new protocol decoder of china fast power charger spec. UFCS. full files under https://github.com/392625227/UFCS-protocol-compare-with-USB-PD.

[kamocat]

Hi Edison Ren,
Thank you for your contribution. To help me review this, please:

• provide an English translation of the UFCS specification
• create a pull request to sigrok-dumps for the signal capture ufcs_pv.sr.

Also, I want to ask about the stacked decoder. You chose to stack on top of the UART decoder, but it's not really UART-based. From your README:

The physical layer of UFCS is the UART serial port. Almost all MCUs have their own UART serial port hardware, which makes product development very simple. However, USB-PD adopts BMC encoding, which simply means that 1 and 0 are represented by the width of the pulse, and the high level of the signal is only about 1V, which requires a hardware comparator, which increases the cost.

This sounds like each UART bytes each represents a single bit, as in HDQ. Would it make more sense to measure the bit-width directly, as the SDQ decoder does?

[guilin007]

Hello,
I want to add an analyzer to the SIF protocol.

The line status is low when idle.
Each frame of data consists of three parts: synchronization signal + 12-bit (12*8bit) data+end signal.
The data signal uses the high and low level duty cycle to send data packets.
Data 0: (32 Tosc for low level, 64 Tosc for high level);
Data 1: (64 Tosc for low level, 32 Tosc for high level);

Stop signal :(5-10ms low)

The ratio of high and low levels is generally 0.5ms and 1ms

I need a master to help me complete the writing, because I only know a little bit of C programming and other programming languages

Thank you very much for your help

[392625227]

Hi， There is a detailed documents for how to upgrade to support an new protocol, it's not so hard than c.  for an protocol, we need the spec of SIF and a device for testing. regards xn.

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---Original--- From: ***@***.***> Date: Thu, Nov 6, 2025 11:24 AM To: ***@***.***>; Cc: ***@***.******@***.***>; Subject: Re: [sigrokproject/libsigrokdecode] a new protocol of china fastpower charger spec. UFCS. (PR #101) guilin007 left a comment (sigrokproject/libsigrokdecode#101) Hello, I want to add an analyzer to the SIF protocol. 768f65dfdc7078e6c59c31b1ae111850.png (view on web) The line status is low when idle. Each frame of data consists of three parts: synchronization signal + 12-bit (12*8bit) data+end signal. The data signal uses the high and low level duty cycle to send data packets. Data 0: (32 Tosc for low level, 64 Tosc for high level); Data 1: (64 Tosc for low level, 32 Tosc for high level); Stop signal :(5-10ms low) The ratio of high and low levels is generally 0.5ms and 1ms I need a master to help me complete the writing, because I only know a little bit of C programming and other programming languages Thank you very much for your help — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you authored the thread.Message ID: ***@***.***>