50g stack font

[DavidM]

(07-23-2019 05:52 PM)grsbanks Wrote:  but how do you set the contrast programmatically? By storing a value in a specific nibble?

Yes, though the value actually takes up 5 bits instead of 4 (the allowable values are 0-31). The low-order 4 bits of the contrast value are stored at location 00101h and the high-order bit of the contrast value is stored in the low-order bit of address 00102h. The high-order 3 bits of address 00102h should be left alone, as they are dedicated to display status and shouldn't be changed.