udpdemo.c

来自「一种操作系统源码核」· C语言 代码 · 共 40 行

#include "Page1.h"
#include "protocol.h"

static XCHAR _pUdpData[UDB_LENGTH+EP_DATA+IP_DATA+UDP_DATA];

void UdpDemoRunLarge()
{
	DCHAR i;

	// move the large data to output sdram, so we can dump it out to check the data in pc
	if (Adapter_iReceiveLenHigh)
	{
		for (i = 0; i < Adapter_iReceiveLenHigh; i ++)
		{
			SdramRead(FLAGS_SDRAM_HI, NE2000_IN_SDRAM_LO+i, SRAM_DMA_HALF_DWORD);
			SdramWrite(FILE_OUT_SDRAM_HI, i, SRAM_DMA_HALF_DWORD);
		}
	}
	if (Adapter_iReceiveLen)
	{
		SdramRead(FLAGS_SDRAM_HI, NE2000_IN_SDRAM_LO+Adapter_iReceiveLenHigh, SRAM_DMA_HALF_DWORD);
		SdramWrite(FILE_OUT_SDRAM_HI, Adapter_iReceiveLenHigh, SRAM_DMA_HALF_DWORD);
	}

	SdramRead(FLAGS_SDRAM_HI, NE2000_IN_SDRAM_LO, UDP_DATA/4);			// Get the receive udp head info
	UdpOpen(_pUdpData, Sdram_pDataCache[UDP_SRC], Sdram_pDataCache[UDP_SRC+1]);

	// test to send a large packet to pc, data length = 255, data is from 0 to 254
	for (i = 0; i < 255; i ++)
	{
		Sdram_pDataCache[EP_DATA+IP_DATA+UDP_DATA+i] = i;
	}
	SdramWrite(FLAGS_SDRAM_HI, NE2000_OUT_SDRAM_LO, SRAM_DMA_DWORD);	// write 512 bytes for simple reason
	UdpSendLarge(_pUdpData, 255);
}