MATLAB DESIGN HDL CODER RELEASE NOTES Guide de l'utilisateur télécharger pdf (Page 152)

152 www.xilinx.com System Generator for DSP User Guide

UG640 (v 12.2) July 23, 2010

Chapter 2: Hardware/Software Co-Design

// obtain the memory location for storing the settings of shared memory

"t"

xc_get_shmem(iface, "toreg", &toreg);

// write value to the "din" port of shared memory "toreg"

xc_write(iface, toreg->din, (const unsigned) value);

Single-Word Reads

The following code snippet reads data stored in the "From Register" shared memory

named "fromreg" into "value".

uint32_t value;

xc_iface_t *iface;

xc_from_reg_t *fromreg;

// initialize the software driver, assuming the Pcore device ID is 0

xc_create(&iface, &SG_PLBIFACE_ConfigTable[0]);

// obtain the memory location for storing the settings of shared memory

"fromreg"

xc_get_shmem(iface, "fromreg", (void **) &fromreg);

// read data from the "dout" port of shared memory "fromreg" and store

at value

xc_read(iface, fromreg->dout, &value);

Accessing "From FIFO" and "To FIFO" shared memories

Single-Word Writes

The following code snippet writes value to the "To FIFO" shared memory named "tofifo".

uint32_t full;

uint32_t value;

xc_iface_t *iface;

xc_to_fifo_t *tofifo;

// initialize the software driver, assuming the Pcore device ID is 0

xc_create(&iface, &SG_PLBIFACE_ConfigTable[0]);

// obtain the memory location for storing the settings of shared memory

"t"

xc_get_shmem(iface, "tofifo", (void **) &tofifo);

// check the "full" port of shared memory "tofifo"

do {

xc_read(iface, tofifo->full, &full);

} while (full == 1);

// write value to the "din" port of shared memory "tofifo"

value = 100;

xc_write(iface, tofifo->din, value);

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MATLAB DESIGN HDL CODER RELEASE NOTES Guide de l'utilisateur Page 152