I am attempting to use the evaluation board and software to talk to my board that has the 1281 installed, but not all its signals exposed.
I removed the 1281 from an EVM daughter board and with jumpers on the headers, I have wired the following over to my board:
GND
SCLK
DRDY#
DIN
DOUT
SYNC
RESET#
On my board I have PINMOD pulled to GND, M0,M1, PWRDN pulled high, MCLK pulled low, CLK tied to 4.096MHZ .
On a working setup with an original daughter board, i monitored for activity on PWRDN, MO, M1, MFLAG, and saw nothing.
When attempting to run with my board,
the ADCpro software comes up, seems to load normally, the LED on main board does the same as with an original board . The LED reads b (minus the left bottom leg) then the dot appears, then 1. 2. 8. 1. The messages about loading firm ware, reseting/conecting to the DSP all seem fine. But past that, if I try to change a setting on the 1281, like the sampling rate, I no longer get any SCLK activity.
As best I can I have monitored activity on sclk, din, dout during the ADCpro startup. Even on the working original board, dout seems inconsistent the first 8 or so sclk burst. Signal integrity seems good on my board.
While using the original board that works, I connected the cables, but left my board unconnected at other end, and ADCpro still worked, so it seems it can drive the cables fine.
I have seen my board work fine in PINMOD in another environment, good ADC data was read over the spi interface.
Any thought on why ADCpro stops issuing any commands or what I should focus on?
thanks