SENA HD1200 - Manual (Page 45)

Starter Kit and User Manual for the HelloDevice 1200
42
6.4 Sample Programs
6.4.1 Using the Socket Program for Communication
The following C program source code shows how to implement Internet socket interface program for the
HelloDevice communication. This sample code is implemented to read and to write Dual-Port RAM data, by
using Berkeley socket C API functions. This source is a part of the entire source code “the HelloDevice
installation folder\Src\C\dprdemo.c”. TestThroughput() function is for testing the maximal speed of the
communication in your network environment.
//---------------------
// Process Test Throughput
//---------------------
void TestThroughput()
{
unsigned char commandBuf[5], *ResponseBuf ;
int commandLen, lenReceived ;
int j, total_length=0 ;
int offset, length, tmp ;
double bps=0 ;
int err, loop ;
int clientLen ;
clock_t start, finish;
double duration;
// Enter loop count for this test...
printf("\nEnter loop count of this demo....\n>>") ;
// Read loop count
scanf("%d", &loop) ;
// Fix the size as 1450, which is max. of Ethernet packet size
// This is max. size of the DPRAM data that can be transferred in the HelloDevice
offset = 0 ;
length = 1450 ;
// Initialize TCP socket
TCPSocketInit() ;
// Make TCP command : 6-byte coce
// 1) Command ID
commandBuf[0] = DPRGet ;
// 2) DPRAM address
tmp = offset >> 8 ;
commandBuf[1] = tmp ;
tmp = offset & 0x00FF ;
commandBuf[2] = tmp ;
// 3) DPRAM length
tmp = length >> 8 ;
commandBuf[3] = tmp ;
tmp = length & 0x00FF ;
commandBuf[4] = tmp ;
// 4) Interrupt flag
commandBuf[5] = 0 ; // 0: Do not generate Interrupt to device, AA: Generate interrupt
commandLen = 6 ;