Sundance SMT8056 - Manual (Page 9)

3.2 How It Works
The system works by using two main interfaces;
A ComPort, and
An SDB
There are several ways of using both of these interfaces within Diamond. The
following is just one of these approaches.
For the application to utilise the SDB, one must be ‘claimed’ – see demo356_365.c
line 79.
Sdb0 = SMT_SDB_Claim(0);
Configuration of the SMT356 mode is performed using a ComPort. These interfaces
do not need to be claimed, but using the following approach, one must be careful
not to use a ComPort that is already being used by the rest of the system.
The SMT356 control word must be composed following the details in the SMT356
User Manual. This control word is then sent to the SMT356;
link_out_word(ctrl_word, 0);
Firstly, the control word must be sent with the internal trigger enable bit clear. After
this word has been sent, any further words sent with the trigger bit set will cause an
acquisition to start.
Immediately after the start control word has been sent, an SDB read instruction can
be performed;
SMT_SDB_Read(Sdb0, sizeof(Data), Data);
This defines the source interface as Sdb0 (a pointer returned in the SMT_SDB_Claim
call earlier), the length of data, and the destination.
This function will wait until all of the data has been received before execution
continues. A properly designed multi-threaded application would not have this
limitation. It is only used here for simplicity.
When the data has been received, it can be converted into floats and then sent to the
display tasks.