Hi, By datasheet this glcd 128x64 using ST7920 driver need at least 72us for each transaction except the clear command which needs 1.6ms. I'm doing the time delays in my library and it's working ok, but what is interesting is that there's a master library by cbm80amiga which is found here: cbm80a…

If you dig into the source code, you'll see something like this void ST7920_SPI::sendCmd(byte b) { SPI.beginTransaction(SPISettings(SPI_SPEED, MSBFIRST, SPI_MODE3)); digitalWrite(csPin, HIGH); SPI.transfer(0xF8); SPI.transfer(b & 0xF0); SPI.transfer(b << 4); digitalWrite(csPin, LOW); …

ST7920_SPI_master library not using delays for glcd128x64

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hzrnbgy September 19, 2021, 11:54pm 8

Looks like SPI for the LCD maxes out at 1.666 MHz.

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ST7920_SPI_master library not using delays for glcd128x64

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