Speedup for drawChar() and 'everything' with setAddr() #59
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This was referenced Jul 13, 2020
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This PR includes 2 main changes. I simplified and cleaned up the code for drawChar(). Now it's much easier to follow and will be faster on slow CPUs. I also optimized the setAddr() function which is used by everything. It now retains the last x/y info so that it will only use the X or Y (col / page) to avoid extra commands/data being transmitted.