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Raspberry Pi 4 digit 7 segment display effects without GPIO libraries.
Sloppy code with lots of repeating the same portions.
displayword(unsigned char str[5]) // simply display a word, use in a loop
blinkword(unsigned char str[4], int repeat) // blink word once plus any integer > 0. <0 will blink forever
runclock(void) // display the time on the display, forever
scrollword(char *string) // scroll the string from right to left with a small buffer of extra characters
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