In direct segment "mode", the CODE B ROM would be bypassed for direct control from the SIPO register ( serial in, par. The functional diagram on p5 shows 5 registers including a MODE Register that defines how the chip interprets incoming data. Thanks, it's just sort of an interesting chip that I'd like to learn more about. Is it storing something in SRAM and then uses some sort of timer/refresh to keep the digits on? Also I'm curious how it handles turning on multiple segments when doing it via serial. (We send 16 bits, and it only looks at the last 4 correct?) (BTW this makes me not understand what LOAD is for exactly.)Īnd then there is decode mode, which I guess is the main way to turn on digits via serial as opposed to just turning them on via DIG7-DIG0.Īm I even on the right track on this? I'm just a bit confused how it all works together. From my vague understanding we send it serial data to the DIN pin of what segment we want to display, and it outputs that to SEG A-G. Maybe I'm a bit confused how it works exactly. It mentions the SEG A-G connecting to the obvious segments of the 7-segment display (AND2307SLC mentioned in the datasheet).but what exactly are the DIGI 0-7 for then? (But then on page 13 it shows them actually connected.)
However I'm looking at the datasheet, and am a bit confused. However there are 7-segment display drivers (such as the MAX7219) that seem pretty popular. Kind of an elegant solution as the software does not have to care what it is displaying but rather just needs to know the resolution.So I know to drive a 7-segment display you need a TON of pins. A Pi Pico does all of the graphics computation and feeds the data to the FPGA for mapping to the 7 segment array. To control all of the display board I decided to go with an Intel MAX10 FPGA as I have worked with them a lot.
I figured this gave a good balance between speed and not driving myself crazy with wiring. I decided that driving all sixty four MAX7219's in one massive SPI chain was probably a bad idea so they have been configured in eight rows of eight controllers each. I did not want to have one massive board to contain everything so I broke the display board into sixteen smaller boards.Įach board will contain a four MAX7219's driving two four character 7 segment displays for a total of 32 characters per board.
I decided on a nice round 512 seven segment displays. After seeing things like the DigitGrid and the Pligboot Matrix I decided that I was going to build a 7 segment LED matrix to add to my collection of LED clocks and displays.įirst off was deciding how big I wanted to go.
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