PIC Audio

[toofastdave]

See M25P32 PIC Audio **warning, other compiler**
Includes hardware SPI routines.

Norm

Norm,
Great project. I think I read about it last week when I was searching for PIC Audio Projects. Thanks for the link and the additional info. Where did you originally get the info for the SPI harware routines if they aren't in the PBP or Proton Manual?? Does RealBasic cover it in their manual?

[Normnet]

Learn hardware SPI routines:

1.Read data sheet timing diagrams.

2.Test with working SHIFTOUT and SHIFTIN program. (SHIFTOUT pbp & SHOUT proton are almost identical)

3.Bitbang above program, something like:
low CS pin
pause
low clock pin
pause
high dataout pin (bit 7 = 1)
pause
high clock pin
pause
low clock pin
pause
low dataout pin (bit 6 = 0)
etc.

Watch on scope or if you don't have a scope make a led driver with pin > N channel FET > pullup & P channel FET > LED.

4.Now timing known. Read PIC 452 data sheet page 130 for your SPI configuration of
SSPSTAT = %01000000
SSPCON1 = %00100010

See SPI clk speed adjustment post 13.
Hardware SPI extremely fast compared to SHOUT.
Sends and receives in 3line instruction.

Norm