FINALLY – the MSP430x2xx new serial module sucks! Finally got I2C working.
It took a solid 25+ hours of work, but I finally got the MSP430F2618 to talk to the AD5933 via I2C. The TIs documentation sucks, their module sucks, and I’m angry. But it works now. A hit to those that might be stuck: The USCIABxTX_ISR() interrupt vector should be called the Master interrupt vector, and their USCIABxRX_ISR() interrupt vector should be the Slave interrupt vector. In master mode, both the TX and RX interrupt enables results in the TX_ISR() vector being called.
Other issues include that the SDA line gets stuck latched low and will persist through a power cycle and a reprogramming. You expicitley have to pull the line high in software to reset it.
A bunch of other issues later, I got it working.. I ended up picking up a new logic analyzer because of it’s improved interface than my USBee unit. $150, and it ROCKS. Joe makes them locally, and I recommend you pick one up for your toolbox.
data read from ad5933
Dear Reza,
I noticed that you know and work a lot with electronics, I need your help please, I noticed you have worked with the MSP430F2618.
I am a new PhD student, my background is in mathematical communications (coding theory, multimedia compression, and channel fading modeling)
I got a scholarship that pays my fees by a project, which I am a member in ( I know I am explaining a lot)
our project is in wireless sensor networks. We have setup a remote sensor network, and we need to link this remote network by a satellite link. since i have no electronics background whatsoever, I started searching on how to build a base station, that takes the data from the sensor network and sends it via a satellite link. what i reached is I can use a Zigbee compatible RF transceiver combined with an ATMEL 128 or MSP430F2618 processor to control the data flow, the processor must be connected to the satellite link directly.
I would like your expertise (if possible) in guiding my first steps, since I only started 2 weeks ago.
yours truly,
Basel
azaz104@gmail.com
8BA5@queensu.ca
Dear Reza,
I’ve been trying to use the AD5933 with the software I got when I purchased it. And I’m not really sure I understand correctly how the software works. I am able to get correct impedance readings if I calibrate it correctly, but the phase is still off. I was wondering if you had any experience with the software, or know of any other types of software that I can use with the AD5933.
(I’m on my first day of my summer project, never done this before.)
Sincerely,
Evelyn Livermore
Do you have the eval kit for it? The software seemed to work fine for me, though I never validated the phase — I was only interested in magnitude variations corresponding to thoracic impedance changes from breathing. Otherwise, I just communicate via I2C from the MSP430.