Codes at home. The proto board is running at 16mhz and the final version will run at 20mhz.Originally Posted by skimask
I know what's slowing it down. In my rush to write the code (I wanted to see if this F-RAM really was a drop-in replacement for the 24C64's), I simply re-addressed the I2C for every write and this is sending way too many bits per write. It's kicking out 48 bits per byte write yet my I2C handler will send out 9 bits per byte (after a one-time command/address string) and at about twice the clocking speed. That will bring the data transfer rate up to about 10 times faster overall.
I was about to go ahead and write a variable string of say 16 bytes per I2C_WRITE to speed things up, but decided not to waste my time, knowing I'd sooner or later bit-bang the I2C for the fastest results. I'm writing the I2C handler to run at the 20mhz speeds, so what I get at 16mhz will be off of top possible speeds by 20%.
I should get the simple use of my I2C handler finished tonight. It would have been done last night, but I went to bed early. I've been puting in some long days the past few weeks thanks to this project. I'll see if I can remember to bring some code to work to post. I think it's about 500 lines now (text editor lines, not instruction lines) but should be easy to follow because I tab, space and sub block in logical places, except when I'm debugging fast. The code is still full of unnecessary debug lines.
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