I want to alloc some buffer to buffering DMA data from PCIe FPGA, my idea is create 512KB * 2048 buffer about 1GB, and i want to use the buffer by virtual address(VI_ATTR_WIN_ACCESS = VI_DEREF_ADDR), it looks like the max times of viOpen is 500, i tried use many Resource Manager. can I break the limit ? Or some kind of other method ? here is my code. thx.
int main(int argc, char **argv) {
const UINT size = 0x80000;
ViSession rsrcManager;
ViSession vi;
ViBusAddress viBusAdr;
ViAddr viAddr;
ViUInt32 viUint32;
ViPUInt32 viPUint32;
list<ViBusAddress> viBusAdrs;
ViUInt16 viUint16;
int nBlockIndex;
int nRsrcMgrIndex;
list<ViBusAddress>::const_iterator iter;
EmptyAllSet();
viOpenDefaultRM(&rsrcManager);
nRsrcMgrIndex = 0;
while (1) {
viOpenDefaultRM(&rsrcManager);
for (nBlockIndex = 0; nBlockIndex < 100; nBlockIndex++) {
if (viOpen(rsrcManager, "PXI::MEMACC", VI_NULL, VI_NULL, &vi) < VI_SUCCESS) {
printf("Open Error %d %d\n", nRsrcMgrIndex, nBlockIndex);
goto print_result;
}
if (viMemAlloc(vi, size, &viBusAdr) < VI_SUCCESS) {
break;
} else {
if (viMapAddressEx(vi, VI_PXI_ALLOC_SPACE, viBusAdr, size, VI_FALSE, VI_NULL, &viAddr) < VI_SUCCESS) {
printf("Map Error\n");
}
if (viGetAttribute(vi, VI_ATTR_WIN_ACCESS, &viUint16) < VI_SUCCESS) {
printf("Get Attribute Error\n");
}
if (viUint16 != 3) {
printf("Map Result Error\n");
}
viBusAdrs.push_back(viBusAdr);
}
}
nRsrcMgrIndex++;
}
print_result:
printf("%dK * %d = %dM\n", size / 1024, viBusAdrs.size(), size * viBusAdrs.size() / 1024 / 1024);
getch();
return 0;
}
