ADIS16250: Help with setting up SPI

[Raflex]

The data adresses is ok. However, the ADIS16250 SPI clock speed is 2.5 MHz, you need to decrease your clock speed in order to transfer data between devices.

Try reading the status register of the ADIS16250 ($3C).

[InitialDriveGTR]

How does one go about decreasing the SPI clock speed?

Thanks,
Benjamin B. Roy

[Raflex]

Hello. add this line to your code:

DEFINE SHIFT_PAUSEUS ms

ms is the time in milliseconds between clock pulses

[InitialDriveGTR]

What would be a good pause time? (Note that I am completely new to this)a

[Raflex]

To obtain clock speed:

Freq [Hz] = 1/period[seconds]

Test it with 1 ms (about 1Khz).

If it doesnt work try with another SPI mode, remember MSB first.

[InitialDriveGTR]

This is my code:

<code>
DEFINE OSC 20
DEFINE HSER_RCSTA 90h
DEFINE HSER_TXSTA 24h
DEFINE HSER_SPBRG 21 ' 57600 Bauds
DEFINE HSER_CLOERR 1
DEFINE SHIFT_PAUSEUS 1000

INCLUDE "modedefs.bas"

Hserout ["ACTIVE",13]

RST var portd.0
SCLK var portd.1
CS var portd.2
DOUT var portd.3 'data from PIC to Gyro
DIN var portd.4 'data from gyro to PIC

temp var word'(2)
index var word

High SCLK
High CS
high RST

pause 1000

main:
low CS
Shiftout DOUT, SCLK, 1, [$3C,$00]
high cs
pause 100

low CS
SHIFTIN DIN, SCLK, 2, [temp\16]
high CS
pause 100

HSEROUT ["Temp: ",HEX4 temp,13]
pause 100
goto main
</code>

And the output I am getting out is (HEX):

ACTIVE
Temp: 0000
Temp: 0900
Temp: 0900
Temp: 0900
Temp: 0900

Thanks

[Raflex]

Is it correct? Does it work?

Take a look on Table 41 STATUS Bit descriptions (Datasheet pp. 30):

Address 0x3D, 0x3C
Default 0x0000
Default is valid only until the first register write cycle.

Try reading X-Axis data or another register.