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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3376 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo
2011-03-13 15:12:31 +00:00
parent 150b525f34
commit d146196b72
6 changed files with 154 additions and 124 deletions
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include/net/uip/uip-arch.h
+13 -23
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@@ -102,33 +102,23 @@ struct uip_driver_s
uip_ipaddr_t d_draddr; /* Default router IP address */
uip_ipaddr_t d_netmask; /* Network subnet mask */
/* The d_buf array is used to hold incoming and outgoing
* packets. The device driver should place incoming data into this
* buffer. When sending data, the device driver should read the link
* level headers and the TCP/IP headers from this buffer. The size of
* the link level headers is configured by the UIP_LLH_LEN define.
/* The d_buf array is used to hold incoming and outgoing packets. The device
* driver should place incoming data into this buffer. When sending data,
* the device driver should read the link level headers and the TCP/IP
* headers from this buffer. The size of the link level headers is
* configured by the UIP_LLH_LEN define.
*
* Note: The application data need not be placed in this buffer, so
* the device driver must read it from the place pointed to by the
* d_appdata pointer as illustrated by the following example:
*
* void
* devicedriver_send(void)
* {
* hwsend(&dev->d_buf[0], UIP_LLH_LEN);
* if(dev->d_len <= UIP_LLH_LEN + UIP_TCPIP_HLEN)
* {
* hwsend(&dev->d_buf[UIP_LLH_LEN], dev->d_len - UIP_LLH_LEN);
* }
* else
* {
* hwsend(&dev->d_buf[UIP_LLH_LEN], UIP_TCPIP_HLEN);
* hwsend(dev->d_appdata, dev->d_len - UIP_TCPIP_HLEN - UIP_LLH_LEN);
* }
* }
* uIP will handle only a single buffer for both incoming and outgoing
* packets. However, the drive design may be concurrently send and
* filling separate, break-off buffers if CONFIG_NET_MULTIBUFFER is
* defined. That buffer management must be controlled by the driver.
*/
#ifdef CONFIG_NET_MULTIBUFFER
uint8_t *d_buf;
#else
uint8_t d_buf[CONFIG_NET_BUFSIZE + 2];
#endif
/* d_appdata points to the location where application data can be read from
* or written into a packet.