Re: Interfacing ARM and AD8403(Digital Potentiometer)

Hi, Bhaageerathi.

According to your previous posts, you were able to write to the part.

for RDAC1, data  01=520  (SPI->DR=0x0001)

     data  02=568                  (SPI->DR=0x0002)

     data  03=610                   (SPI->DR=0x0003)

for RDAC2, data  01=529      (SPI->DR=0x0101)

     data  02=549                   (SPI->DR=0x0102)

     data  03=598                      (SPI->DR=0x0103)

 

for RDAC3, data  01=520    (SPI->DR=0x0201)

     data  02=563                 (SPI->DR=0x0202)

     data  03=611                (SPI->DR=0x0203)

 

for RDAC4, data  01=501   (SPI->DR=0x0301)

     data  02=543                   (SPI->DR=0x0302)

     data  01=593                   (SPI->DR=0x0303)

On your new way of writing to the part, I notice that you separated the address and the data. What exactly is the difference between the two methods and what are you trying to achieve?

Regards,

Mark