Architecture and Instruction Set of the C6x Processor - Digital Signal Processing and Applications with the C6713 and C6416 DSK - page 112

FIGURE 3.20. CCS windows for the sum of products in the project dotp4a .

wait B wait ;wait here

Verify that the resulting sum of products is A4 = 0x28 = 40. Note that A0

contains the result address ( result_addr ). Select View Core

Registers and verify this address (in hex). Figure 3.20 shows a CCS display of this
project. Note from the disassembly file that execution was halted at the infinite wait
loop.

Æ Registers Æ

Example 3.7: Dot Product Using C Function Calling a Linear Assembly
Function ( dotp4clasm )

Figure 3.21 shows a listing of the C source program dotp4clasm.c , which calls
the linear assembly function dotp4clasmfunc.sa , shown in Figure 3.22. Example
1.3 introduced the dot product implementation using C code only. The previous five
examples introduced the syntax of assembly-coded programs.
The section of code invoked by the linear assembler optimizer starts and ends
with the linear assembler directives, .cproc and . endproc , respectively. The name
of the linear assembly function called is preceded by an underscore since the calling
function is in C. The directive .def defines the function.