Thinking about it, there may be a hardware issue in either the nRF51, or in this low-price variant. Checked the communication with the original, and SPI clock frequency was in the ~150-160kHz range. But according to the datasheet the LCD driver can support 1 or 2 MHz clock rates...
And next thing: any pointers about how to handle the segment LCD efficiently? Mapped the segments, but they are all over the place. Never done anything like this.
The original firmware sends all data all the time, I guess that was easier for them.
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