RTC
®
5 PC Interface Board
Rev. 1.9 e
10 Commands And Functions
455
Undelayed
Short
List Command
set_mcbsp_out
Function defines two signal types for output at the McBSP interface (Multi channel Buffered Serial
Port, also see page 52).
Call
set_mcbsp_out( Signal1, Signal2 )
Parameter
Signal1,
Signal2
desired signal type as unsigned 32-bit values
Comments • The selectable signal types are identical to those of the set_trigger command (refer to
the comments there for the allowable value range, signal types and other information).
If the value for
Signal1
/
Signal2
is unallowed, then set_mcbsp_out will be replaced by
list_nop (get_last_error return code
RTC5_PARAM_ERROR
).
• Both selected data signals will be continuously transmitted (once per 10 µs cycle).
• Only 16-bit portions of the selected data signals are packed into a common 32-bit data
word for output.
Signal1
is the lower half and
Signal2
the upper half of this 32-bit data
word.
–Only RTC
®
4-compatible bits #4-19 of the sample values and status values returned
by the scan system (
Signal1, Signal2
= 1-23, 25-30) are outputted. The least sig-
nificant 4 bits and any exceeding bits (in the virtual image field) are ignored.
– For the other data types (
Signal1, Signal2
= 0, 24, 31-42), the least significant 16
bits are outputted and the upper bits are ignored (only relevant for
Signal1,
Signal2
= 37-42 and possibly 24 and 31).
• Transmitted values are those of the preceding clock cycle: data is processed at the end
of a cycle and transmitted at the beginning of the next clock cycle at the set transmis-
sion frequency (see set_mcbsp_freq).
• The signals and operating conditions of the McBSP interface are presented in the
section "McBSP Interface" on page 52.
RTC
®
4
RTC
®
5new command
Version info Last change with version DLL 531, OUT 532:
• Further selectable data signals (
Signal1, Signal2
= 25…42, see set_trigger).
• For some of the new data signals, only the lower 16 bits are outputted (see above).
References read_mcbsp, mcbsp_init, set_mcbsp_freq, set_mcbsp_out_ptr, set_trigger
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