krnl_s2mm.cpp

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/* This is a stream to memory mapped data mover kernel which takes input from a
stream and writes data
to global memory via memory mapped interface */

#include "ap_axi_sdata.h"
#include "ap_int.h"
#include "hls_stream.h"

#define DWIDTH 512
#define TDWIDTH 16

typedef ap_axiu<DWIDTH, 1, 1, TDWIDTH> pkt;

extern "C" {
void krnl_s2mm(ap_uint<DWIDTH> *out,     // Write only memory mapped
               hls::stream<pkt> &n2k,    // Internal Stream
               unsigned int     size     // Size in bytes
               ) {
#pragma HLS INTERFACE m_axi port = out offset = slave bundle = gmem
#pragma HLS INTERFACE axis port = n2k
#pragma HLS INTERFACE s_axilite port = out bundle = control
#pragma HLS INTERFACE s_axilite port = size bundle = control
#pragma HLS INTERFACE s_axilite port = return bundle = control

  unsigned int bytes_per_beat = (DWIDTH / 8);
  //unsigned int count = 0:
data_mover:

  int i = 0;
  pkt v;
  // Auto-pipeline is going to apply pipeline to this loop
  for (unsigned int i = 0; i < (size / bytes_per_beat); i++) {
    n2k.read(v);
    out[i] = v.data;
  }
  // do {
  //   n2k.read(v);
  //   out[i] = v.data;
  //   count++;
  // } while (v.last != 1)
  // size = count;
}
}