bohumilfulin
Member level 3
codes for moving text
I am designing a moving text display. I have a problem with moving text to left or right.
The problem is the thickness of all characters is doubled. Exactly each vertical line has 2 pixels width but I can see 4 pixels. When speed is slow, everything looks ok but if speed is "average" or higher, all characters looks doubled.
I use high power LED but situation is the same for low or high contrast
HW the line of hc595+uln2803 (20pcs) for rows. rows are loaded by HW SPI
1pc hc595+uln2803+P_mosfet for columns loaded by FW spi. Multiplex 1:8.
MCU atmega128 @16MHz.
I know that most thinks are depend on HW but would you recommend me a flow diagram or piece of code for 100% working FW.
thanks in advance
I am designing a moving text display. I have a problem with moving text to left or right.
The problem is the thickness of all characters is doubled. Exactly each vertical line has 2 pixels width but I can see 4 pixels. When speed is slow, everything looks ok but if speed is "average" or higher, all characters looks doubled.
I use high power LED but situation is the same for low or high contrast
HW the line of hc595+uln2803 (20pcs) for rows. rows are loaded by HW SPI
1pc hc595+uln2803+P_mosfet for columns loaded by FW spi. Multiplex 1:8.
MCU atmega128 @16MHz.
I know that most thinks are depend on HW but would you recommend me a flow diagram or piece of code for 100% working FW.
thanks in advance