Display flickers when using print method with decimal point or colon.

[MarkMoss]

Subject of the issue

Display flickers when using print method with string containing decimal point or colon.

Your workbench

• Using SparkFun RedBoard Qwiic with one SparkFun Qwiic Alphanumeric Display.
• Powered via USB.
• Using Arduino 1.8.19.

Steps to reproduce

Run the sketch below:

#include <SparkFun_Alphanumeric_Display.h>

HT16K33 display;

void setup() {
  Wire.begin();
  display.begin();
}

void loop() {
  display.print("12:34"); 
}

Expected behavior

The four digits on the display should display "1234" and the colon segment should be illuminated.

Actual behavior

The last two digits, containing "34" flicker perceptibly, while the first two digits and the colon segment are on steadily. Other than the flicker, the display is correct.

[sfe-SparkFro]

Thanks for the bug report! I can confirm the display flickers with the provided code, which is caused by setColonOnOff() updating the display before the remaining segments have been set in displayRAM. Will implement a fix shortly!

[sfe-SparkFro]

Fixed with v2.2.7. Thanks again!