Heroway serial screen control FAQ (3)

Question

Accepted Answer

This section covers QR-code and RTC widgets: QR code position on portrait screens (swap X/Y, e.g. 157,463 becomes 463,157); flickering QR code (format the flash, re-download, upgrade the kernel if needed, then check for subtle changes in the data itself); QR code not displaying or garbled (send ASCII or GBK codes of at least 13 Chinese characters; update the 12-pinyin bin file or check the kernel version); larger QR codes (dedicated kernel supports up to 15x15 dot modules, a whole 8-inch screen can be one code); RTC showing only date (change format Y-M-D H:Q:S W to Y-M-D); no backspace on k600+; T5/T5L RTC is not a register, write address 009c; RTC entry causing reboot (keyboard display area exceeds keyboard bounds); uploading RTC changes (the RTC upload checkbox is invalid; use a key-return button to notify the MCU then read the time with the 0x81 command, or detect a change over 2 seconds via OS); RTC font size (change the X-direction dot count).