经过大量的研究,我找到了STM32f1这个link的源代码,我为STM32f3更改了它。并构建并安装到我的STM32。我的以太网电缆连接在我的电脑和enc28j60模块之间。如果我在main.c
和while循环中调试此代码我的代码堆栈:
while (1)
{
eMBPoll();
led_poll();
/* 从网络设备读取一个IP包,返回数据长度 */
uip_len = tapdev_read();
/* 收到数据 */
**if (uip_len > 0)**
{
/* 处理IP数据包 */
if (BUF->type == htons(UIP_ETHTYPE_IP))
{
uip_arp_ipin();
uip_input();
if (uip_len > 0)
{
uip_arp_out();
tapdev_send();
}
}
/* 处理ARP报文 */
else if (BUF->type == htons(UIP_ETHTYPE_ARP))
{
uip_arp_arpin();
if (uip_len > 0)
{
tapdev_send();
}
}
}
我坚持if(uip_len> 0)行,因为uip_len为此行返回0:
(我的代码与下面的github链接相同,所以我不共享所有代码)
enc28j_60.c在unsigned int enc28j60_packet_receive(unsigned char * packet,unsigned int maxlen)函数中:
unsigned int enc28j60_packet_receive(unsigned char *packet, unsigned int maxlen)
{
unsigned int rxstat;
unsigned int len;
if (enc28_read(EPKTCNT) == 0)
{
return (0);
}
enc28_write(ERDPTL, (next_pack_ptr));
enc28_write(ERDPTH, (next_pack_ptr) >> 8);
next_pack_ptr = enc28_readOp(ENC28J60_READ_BUF_MEM, 0);
next_pack_ptr |= enc28_readOp(ENC28J60_READ_BUF_MEM, 0) << 8;
len = enc28_readOp(ENC28J60_READ_BUF_MEM, 0);
len |= enc28_readOp(ENC28J60_READ_BUF_MEM, 0) << 8;
len -= 4;
rxstat = enc28_readOp(ENC28J60_READ_BUF_MEM, 0);
rxstat |= enc28_readOp(ENC28J60_READ_BUF_MEM, 0) << 8;
if (len > maxlen - 1)
{
len = maxlen - 1;
}
**if ((rxstat & 0x80) == 0)
{
GPIO_SetBits(GPIOE, GPIO_Pin_9);
len = 0;
}**
else
{
des_enc28_readBuffer(packet, len);
}
enc28_write(ERXRDPTL, (next_pack_ptr));
enc28_write(ERXRDPTH, (next_pack_ptr) >> 8);
enc28_writeOp(ENC28J60_BIT_FIELD_SET, ECON2, ECON2_PKTDEC);
return (len);
}
为什么rxstat&0x80)== 0?我不明白。
根据ENC28J60 datasheet,似乎RXSTAT
标志应位于第12位:
我不确定des_enc28_readOp(ENC28J60_READ_BUF_MEM, 0)
是否正在读正确的东西,但我相信你应该有类似的东西:
unsigned PHSTAT2 = des_enc28_readOp(ENC28J60_READ_BUF_MEM, 0);
PHSTAT2 |= des_enc28_readOp(ENC28J60_READ_BUF_MEM, 0) << 8;
unsigned RXSTAT = (PHSTAT2 & 0x1000) != 0;
if (RXSTAT)
{
// RXSTAT flag is set
des_enc28_readBuffer(packet, len);
}
else
{
...
}
我还会将此寄存器的值转储到日志或串行端口,以确保您了解其内容实际是什么:
// I noticed serialprint in your other question, so I am presuming this is your log func
serialprint("PHSTAT2 = 0x%04x\n", PHSTAT2);