Hi Robin, Hi Andreas, > On 13 Dec 2019, at 15:07, Robin Murphy <robin.murphy@xxxxxxx> wrote: > > I also have one of the H96 Max boxes (which I picked up out of curiosity > for the mysterious RK3318) with an FD6551, although I've not attacked > that one with the logic analyser yet to see how similar it is. I have a T9 (RK3328) TV box with the same chip in it. The FD6551 uses an I2C-like protocol. Every digit (and the symbols) have an I2C address, but, the display does not signal ACK. AFAIK the FD650 and FD655 which are used in other boxes (Amlogic) are very similar. So far, I have whipped up a proof-of-cocept driver that uses i2c-gpio. The digits seem to be rotated by 180 degrees. So, in order to use map_to_7segment.h I had to define the BIT_SEG7_* constants differently. My display also has multiple symbols (WIFI, network, pause, play, USB, alarm) that are controlled by writing to the same address as for the colon. I’d love to work on a driver (similar to Andreas’ SPI based driver) for these I2C connected chips. Cheers, Ezra.
