Using the SRU() Macro to Configure the DAI
4-76 ADSP-21368 SHARC Processor Hardware Reference
SRU2(DPI_PB12_O, TWI_CLK_I) /* Clock signal from DPI pin 12
is connected to the TWI slave
clock input */
SRU2(LOW,DPI_PBEN12_I) ) /* Disables DPI pin 12 as input as
the clock is not generated by
the slave
*/
Using the SRU() Macro to Configure
the DAI
As discussed in the previous sections, the signal routing unit (SRU) is con-
trolled by writing values that correspond to signal sources into bit fields
that further correspond to signal inputs. The SRU is arranged into func-
tional groups such that registers that are made up of these bit fields accept
a common set of source signal values.
In order to ease the coding process, the header file sru.h is included with
the VisualDSP++ tools. This file implements a macro that automates most
of the work of signal assignments and functions. The macro has identical
syntax in C/C++ and assembly, and makes a single connection from an
output to an input:
SRU(Output Signal, Input Signal);
The names passed to the macro are the names given in Table 4-4 through
Table 4-9 and in the DAI registers section in “DAI/SRU1 Connection
Groups” on page 4-18. To use this macro, add the code shown in
Listing 4-5 to your source code.
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