- Announcement about May 10th, 2018 update and your password.
Instruction time for RDBYTE / RDWORD / RDLONG
Do they all execute in the same number of cycles? I know they can range from 8 to 23 clock cycles, But beyond that, does a RDLONG take the same time to run as a RDBYTE?
I'm asking because I have a driver I'm working on that drives a OLED 4-bit grey scale display. I have an 8,192 byte array that stores the RAM for the display and when writing characters (in a graphics mode) I need to read/write to that display RAM that is in HUB ram using a COG. I'm trying to reduce the number those reads/writes.
Right now I'm doing it in bytes so for each 8x8 character I'm executing 128 transfers (64 reads & 64 Writes) between HUB and COG memory.
I'm also storing the 128 character definitions in HUB ram. so I have 8 byte reads for each character. I'm looking to also move those definitions to COG RAM because the text drivers does not really have to do too much and I can spare the memory for increased speed.
Also looking to have a scratch pad area that will first see if we have already read a LONG from the HUB Display RAM and if so, work on it locally. Then when all the pixels have been set, write all LONGS back to HUB Ram. Would basically be like an array of offsets into the display RAM and the Value.
If this display was a 1-bit display it would be so much easier.