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Altera_Forum
Honored Contributor I
801 Views

C++ template in memory-mapped master

#include <iostream># include <stdio.h># include <stdlib.h># include "HLS/hls.h" 

 

 

using namespace std; 

using namespace ihc; 

 

 

typedef mm_master<unsigned int, dwidth<32>, awidth<64>, aspace<1>, latency<0>, maxburst<1> > mm_src_t; 

typedef mm_master<unsigned int, dwidth<32>, awidth<64>, aspace<3>, latency<0>, maxburst<1> > mm_dst_t; 

 

# define SEED 3# define NUM_SAMPLES 8 

//#define DUMP_BUFFERS 

 

 

int verify_data(int *src, int *dst, int count, unsigned int x=0) { 

int errors = 0; 

for(int i = 0; i < count; i++) { 

if(dst != (src + x)) { 

errors++; 

printf("mismatch at index %d: 0x%llx != 0x%llx\n", i, (unsigned long long)dst, (unsigned long long)src + x); 

return errors; 

 

 

template<typename T> void dump_buffers(const char* title, T *ref, T *dst, unsigned size) {# ifdef DUMP_BUFFERS 

// Title 

printf("%s:\n", title); 

if(size == 0) return; 

// Reference 

printf(" REF:"); 

for(unsigned i=0; i<size-1; ++i) { 

printf(" 0x%04x,", ref); 

if(i % 8 == 7) printf("\n "); 

printf(" 0x%04x\n", ref); 

// destination 

printf(" dst:"); 

for(unsigned i=0; i<size-1; ++i) { 

printf(" 0x%04x,", dst); 

if(i % 8 == 7) printf("\n "); 

printf(" 0x%04x\n", dst);# endif 

 

 

component void add_x(mm_src_t &src, mm_dst_t &dst, unsigned int x) { 

*dst = *src + x; 

 

 

int main () { 

int x = 0; 

int errors = 0; 

int src_mem[NUM_SAMPLES]; 

int dst_mem[NUM_SAMPLES]; 

 

 

// initialize data 

srand(SEED); 

for (int i=0; i<NUM_SAMPLES; ++i) { 

src_mem = rand() % 2048; 

dst_mem = -1; 

dump_buffers("Initial", src_mem, dst_mem, NUM_SAMPLES); 

 

 

 

 

/* 

1) 

This code creates a new mm_master interface for each iteration of the loop. 

*/ 

x = 0x10; 

for (int i=0; i<NUM_SAMPLES; ++i) { 

mm_src_t src_mm_i(&src_mem, 1*sizeof(int)); 

mm_dst_t dst_mm_i(&dst_mem, 1*sizeof(int)); 

ihc_hls_enqueue_noret(&add_x, src_mm_i, dst_mm_i, x); 

ihc_hls_component_run_all(add_x); 

dump_buffers("New mm_master for each index", src_mem, dst_mem, NUM_SAMPLES); 

errors += verify_data(src_mem, dst_mem, NUM_SAMPLES, x); 

 

 

 

 

/* 

2) 

This code demonstartes use of the getInterfaceAtIndex() function which can 

be used to index into a mm_master object. This can be useful when iterating 

over an array and invoking a component on different indices of the array. 

*/ 

x = 0x20; 

mm_src_t src_mm(src_mem, NUM_SAMPLES*sizeof(int)); 

mm_dst_t dst_mm(dst_mem, NUM_SAMPLES*sizeof(int)); 

for (int i=0; i<NUM_SAMPLES; ++i) { 

ihc_hls_enqueue_noret(&add_x, src_mm.getInterfaceAtIndex(i), dst_mm.getInterfaceAtIndex(i), x); 

ihc_hls_component_run_all(add_x); 

dump_buffers("Use getInterfaceAtIndex()", src_mem, dst_mem, NUM_SAMPLES); 

errors += verify_data(src_mem, dst_mem, NUM_SAMPLES, x); 

 

 

 

 

if (errors) { 

printf("FAILED with %d errors\n", errors); 

} else { 

printf("PASSED\n"); 

}
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2 Replies
Altera_Forum
Honored Contributor I
35 Views

Hello, 

If you want to understand what the general objective of templates use is. 

https://www.tutorialspoint.com/cplusplus/cpp_templates.htm 

Best Regards, 

Johi.
Altera_Forum
Honored Contributor I
35 Views

 

--- Quote Start ---  

Hello, 

If you want to understand what the general objective of templates use is. 

https://www.tutorialspoint.com/cplusplus/cpp_templates.htm 

Best Regards, 

Johi. 

--- Quote End ---  

 

 

 

Thanks Johi for the reply...Actually my question is only regarding to the usage of of C++ template specific to this code. I am aware of C++ template concept but somehow struggling to understand the reason of C++ template usage in this code..... :)
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