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Which is why I suggested using 7bit.

Best Wishes

hello Ttelmah, thanks!

you're right! with 7 bits, in mode3 seems alright.

http://s2.postimg.org/u2ywnlfjt/image.jpg

all values works ok ...

looking at the scope, the SDO pin (compared with SDI) of ad7376, the word is shifted 1bit to the right

http://s16.postimg.org/z01tjqgz9/123.jpg

I believe that this value, wrong, is the used.
t ...

Now, do you really expect to send bytes continuously without any pause at all and be able to make a meaningful measurement on the output?. The Vw settling time is 4uSec, so a minimum of this is need ...

Working:

#USE SPI (MASTER, CLK=PIN_C3, DI=PIN_C2, DO=PIN_C5, MODE=3, BITS=8, STREAM=SPI_1, MSB_FIRST)

VOID main (VOID)
{
WHILE (TRUE)
{
output_ ...

thanks Ttelmah,

but in your code, I did not understand where the value is to be sent.
sorry, I'm beginner.

trying manually, I wrote a code that is looped off and on PIN_C3 with delays of 3us be ...

hello PCM programmer,

first, very thanks!

I'm testing with a resistance meter, between W and A, between W and B.

when I say working, I have a resistence value equivalent to the decimal value ...

tested in another pic I have here,
18f4431 with internal osc,

same result. Sad

trying with software spi:

#include <18F4520.h>
#use delay(clock=10000000)
#FUSES NOWDT, HS, NOPROTECT, NOBROWNOUT, NOPUT, NOCPD, STVREN, NODEBUG, NOLVP,
NOWRT, NOWRTD, NOIESO, NOFC ...

If you look at it the data sheet picture again, it shows an eighth data bit after the seven bits are sent.
To send '3' to the chip, you need to rotate this by one, and send '6'.

also try adding ...

the same

results:
setup_spi ( SPI_MASTER | SPI_MODE_0 | SPI_CLK_DIV_64 );
spi_write (3); = none
spi_write (4); = none

setup_spi ( SPI_MASTER | SPI_MODE_1 | SPI_CLK_DIV_64 );
spi ...

Hello Ttelmah,
first, very thanks!

I was using the same #defines you showed, but with SPI_MODE_3 in setup_spi. only modified to be more objective here.

testing here now, in SPI_MODE_0 nothing w ...

Hello! I'm new here and beginner in PIC uC

I need help with a problem I have no idea how to solve.

I'm trying to control a digipot AD7376 via SPI from PIC 18F4520.

the signals seem correct in ...