HP EZ-KIT Bedienungsanleitung PDF herunterladen (Seite 79)

Getting Started with ADSP-BF548 EZ-KIT Lite 5-7

Using ADSP-BF548 EZ-KIT Lite Hard Disk and LCD Screen

Now double-click the Example_6_heaptab.c filename to open a source

window containing the file’s contents and scroll to the bottom of the file

(Listing 5-1). There are external declarations for two symbol pairs: one

pair for the default system heap, the other pair for our user-defined heap.

The symbols are defined by the linker when the example is built, acting on

commands placed in the linker description file by VisualDSP++. The rest

of the file consists of the initialization of a heap descriptors table, as

detailed under “Defining Heaps at Link Time” in the VisualDSP++ C/C++

Compiler for Blackfin Processors Manual in the online help.

Note that the generated

Example_6_heaptab.c requires no editing.

Listing 5-1. Example_6_heaptab.c File

/* Address and length of system user heaps */

extern “asm” int ldf_heap_space;

extern “asm” int ldf_heap_length;

extern “asm” int FSSGeneralHeap_space;

extern “asm” int FSSGeneralHeap_length;

struct heap_table_t

{

void *base;

unsigned long length;

long int userid;

};

/* Program’s heap descriptor table */

#pragma file_attr(“libData=HeapTable”)

#pragma section(“constdata”)

struct heap_table_t heap_table[3] =

{

{ &ldf_heap_space, (int) &ldf_heap_length, 0 },

{ &FSSGeneralHeap_space, (int) &FSSGeneralHeap_length, 1 },

{0,0,0}

};

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HP EZ-KIT Bedienungsanleitung Seite 79