55 lines
1.2 KiB
Arduino
55 lines
1.2 KiB
Arduino
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#include <SPI.h>
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#include <bitBangedSPI.h>
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#include <MAX7219.h>
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const byte chips = 1;
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// 1 chip, bit banged SPI on pins 6, 7, 8
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MAX7219 display (chips, 6, 7, 8); // Chips / LOAD / DIN / CLK
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const char message [] = "Hello there - testing 123456789 ";
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void setup ()
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{
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display.begin ();
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} // end of setup
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unsigned long lastMoved = 0;
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unsigned long MOVE_INTERVAL = 500; // mS
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unsigned int messageOffset;
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void updateDisplay ()
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{
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const unsigned int messageLength = strlen (message);
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// get each byte required
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for (byte i = 0; i < (8 * chips); i++)
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{
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// find the offset in the message array
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unsigned int charOffset = messageOffset + i;
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// if we have passed the end, go back to the start
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if (charOffset >= messageLength)
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charOffset -= messageLength;
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// send that character
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display.sendChar (i, message [charOffset]);
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}
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// next time show one character on
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if (messageOffset++ >= messageLength)
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messageOffset = 0;
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} // end of updateDisplay
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void loop ()
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{
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// update display if time is up
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if (millis () - lastMoved >= MOVE_INTERVAL)
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{
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updateDisplay ();
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lastMoved = millis ();
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}
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// do other stuff here
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} // end of loop
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