Use BTB connector to reduce iteration cost

[modi12jin]

ch446Q uses the BTB connector to switch, so as to avoid unnecessary iteration costs. I think this is helpful for us to iterate, and the MCU can also be made into a BTB format similar to the Raspberry Pi CM4 calculation module

[modi12jin]

[modi12jin]

mmexport1641472223656.mp4

@Architeuthis-Flux This is my preliminary design, there is still a lot of work I haven’t done, but it outlines the outline

[modi12jin]

@Architeuthis-Flux I finally figured out that soldering a breadboard directly to a PCB is very difficult and unreliable. This is a lesson, I'm going to switch to using the header as a "breadboard"

[modi12jin]

wx_camera_1642734852439.mp4

@Architeuthis-Flux "Pseudo Breadboard Adapter Board"

[modi12jin]

@Architeuthis-Flux I haven't had time to test, currently known problems: the power rail and ground problems are not solved (the later version adds special holes to solve it, which may add some jumpers). The BTB connector is not stable enough (solved by increasing the number or size of btb or Find a new and better connection method).

[modi12jin]

This is the third iteration

[modi12jin]

wx_camera_1645697559070.mp4

[modi12jin]

wx_camera_1645764826792.mp4

 There is no need to connect other transmission data lines except for power supply and ground.

[modi12jin]

1839_1645857622.mp4

SPI emulation

[modi12jin]

1840_1645857639.mp4

1841_1645857654.mp4

There is a problem with the hardware SPI, which usually doesn't work. It may be a wiring problem or other problem, I don't have a logic analyzer and oscilloscope here so I can't clear the specific situation.