4 Wire SPI with Shiftin/Shiftout ?

[CuriousOne]

It still does not works.
I removed all LCD code
I mapped output to different port - still can't capture anything with scope.
And there are no issues with hardware - setting these pins high-low works perfectly.
So it seems like shiftout not working?

[HenrikOlsson]

Yes, you're sending 3 bytes (four atually if you count the command byte ($03)) but what Richard is saying is that $100 does not fit within a byte and according to the manual it will then get truncated to 8bits so in effect your shiftout statement send 3,0,0,0. Are you SURE you don't see a short pulse on the FC-pin? Try

DoIt:
  LOW RST
  SHIFTOUT TC, SCLK, 5, [$AA,$AA,$AA,$AA]
  HIGH RST
  Pause 2
Goto DoIt

Set the scope to trig on the falling edge of RST.

[richard]

And I don't get, what's wrong with $100 ?

how big is the biggest number that can be represented in a byte ?

Shiftout TC, SCLK, 5, [$03,$100,$00,$0] ' Send write command, set start offset

an attempt to read from address 0x1000000 a non valid 25 bit address, except that shiftout will send address of 0x00 since the 8 bit default not over written

maybe [3,1,0,0] or [3,100,0,0] or [3\8,$100\16,0\8] or [3,$100\16,0]

[CuriousOne]

Guys, issue is different - shiftout does not output any data on data pin. So for sure, there will be nothing to read with shiftin.
This is the issue.

[richard]

should we just guess about the new connections and code ?

[CuriousOne]

The code is posted above and connections are clearly seen from there and described

took brand new all parts, will try on breadboard later