jonathspirit / gp8b Goto Github PK

by putting 74HC166 instead of 74HC165, it is possible to load directly 8bits into the serial shifter and do a much better SPI implementation

This work well on early version of the motherboard cause the motherboard had the logic to bypass that problem.

Now with standards and on the GCM V5.0, the motheboard stop doing that and wait for pulses (this is correct) but the logic on the processor isn't valid anymore.

Currently when you are selecting an argument like th operation result (OPRESULT), you have to provide an dummy argument after the instruction in the code :

0x60 (BWRITE1_CLK instruction with an OPRESULT argument)
0x00 (dummy value)
0x61 (BWRITE2_CLK instruction with an OPRESULT argument)
0x00 (dummy value)
0xB2 (RAMW instruction with an SPI argument)
0x00 (dummy value)

The goal is to remove this dummy value when the user select another argument that SRCVALUE.
It will significantly decrease code size.

It will become like this :

0x60 (BWRITE1_CLK instruction with an OPRESULT argument)
0x61 (BWRITE2_CLK instruction with an OPRESULT argument)
0xB2 (RAMW instruction with an SPI argument)

There is a new symbol in kicad for the XC2C256