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max7219_textscroller.c
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max7219_textscroller.c
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#include <max7219_textscroller.h>
int1 shiftCharacterColumnToMatrix(unsigned char character, unsigned int8 column){
if(column > FONT_WIDTH) return FALSE;
unsigned int8 counter = 0;
for(counter = 0; counter < FONT_HEIGHT; counter++){
if(column == FONT_WIDTH){
ledMatrix[counter][MATRIX_COLUMNS - 1] |= 0x00;
}
else{
ledMatrix[counter][MATRIX_COLUMNS - 1] |= (font[character-FONT_OFFSET][column] >> counter) & 0x01;
}
}
return TRUE;
}
int1 scrollMessageLeftMatrixDisplay(unsigned char * message, unsigned int8 messageSize, unsigned int16 loadPin){
if(currentCharColumn > FONT_WIDTH) {
currentCharIndex++;
currentCharColumn = 0;
}
if(currentCharIndex >= messageSize){
currentCharIndex = 0;
return TRUE;
}
shiftMatrixLeft();
shiftCharacterColumnToMatrix(message[currentCharIndex], currentCharColumn);
currentCharColumn++;
unsigned int8 counter = 0;
for(counter = 0; counter < MATRIX_ROWS; counter++){
max7219_SendArray(ledMatrix[counter], counter+MAX7219_D0_REG, loadPin);
}
return FALSE;
}
int1 clearMatrixDisplay(unsigned int16 loadPin){
if(currentScrollerColumn >= SCROLLER_COLUMN_AMOUNT){
currentScrollerColumn = 0;
return TRUE;
}
currentScrollerColumn++;
shiftMatrixLeft();
unsigned int8 rowCounter = 0;
for(rowCounter = 0; rowCounter < MATRIX_ROWS; rowCounter++){
max7219_SendArray(ledMatrix[rowCounter], rowCounter+MAX7219_D0_REG, loadPin);
}
return FALSE;
}