Add support for the HC12

[TG9541]

al177 forked stm8ef and added initial board support for the HC12 (Si4463 not yet working).

To do:

• reverse engineer the HC12
• enable a wireless Forth console on a HC12 through an unmodified HC12
• write docs

[TG9541]

Approach:

• connect logic analyzer to the following signals: nSEL, SCLK, SDO, SDI, nIRQ, GPIO0, and GPIO1
• Establish connection to a 2nd HC12, and make recordings of the following situations:
  • power up to capture initialitzation
  • send "enter" and receive " ok" to capture basic communication
  • send "enter" and receive a stream of data (e.g. WORDS)
• make the communication more readable with an AWK script
• extract Si4463 initialization data by comparing multiple recordings with an AWK script
• analyze initialization and communication sequences

Refer to Board HC12 for first results.

[soyebean]

Hello, can you give me a detailed configuration of HC12？ thank you

[sergey210982]

сб, 15 авг. 2020 г. в 16:44, soyebean <notifications@github.com>:

…

Hello, can you give me a detailed configuration of HC12？ thank you — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#24 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AFVMS5ICBVGKXJZ7HQ7KHP3SAYVDHANCNFSM4DJUGUPQ> .

[TG9541]

@soyebean I had worked on the HC12 and I still have an experimental setup for analyzing the SPI communication between the radio chip and the STM8 in the basement but I never managed to finish it. I'd consider starting over if someone would be willing to share the effort.

[soyebean]

I want to communicate with HC-12 based on 51 single chip microcomputer si4438 wireless chip, but I don't know the preamble pattern and synchronization word of HC-12.I have some HC-12 spi data, but I don't know how to analyze it.

I don’t know why SCLK is a 4-bit or 5-bit clock.

[TG9541]

Analyzing that data is one of the problems: the datasheet assumes that one uses "Simplicity Studio" and I don't know of any decoder. The description above describes how I had planned to approach reverse-engineering.