"); //-->
作者,下家山
11.3 需要添加的东东
参考c/src/lib/libbsp/arm/edb7312/include/bsp.h,在c/src/lib/libbsp/arm/gp32/include/bsp.h中添加cs8900相关的东东; 针对s3c2410修改或添加c/src/lib/libbsp/arm/gp32/network/network.c,有下列内容要添加或修改:①定义cs8900基址,即#define CS8900_BASE 0x19000300②中断号,查看原理图,cs8900用的是EINT9号中断,所以cs8900_isr_data数组要改为rtems_irq_connect_data cs8900_isr_data = {BSP_EINT8_23,
(rtems_irq_hdl)cs8900_isr,
cs8900_isr_on,cs8900_isr_off, cs8900_isr_is_on,
3, /* unused for ARM cpus */
0 }; /* unused for ARM cpus */
③EINT9中断初始化,我把EINT9的中断初始化放在 cs8900_isr_on中,这样可以在安装isr_handler时
初始化static void cs8900_isr_on(const rtems_irq_connect_data *unused)
{
rGPGCON = (rGPGCON & 0xfffffff3)|(1<<3); /*PG1/9 = EINT9*/
rGPGUP = 0xffff;
rEXTINT1 = (rEXTINT1 & ~(7<<4)) | 0x4<<4; /*EINT9=high level triggered*/
rEINTPEND=(1<<9);
/*rSRCPND = BIT_EINT8_23; *//*to clear the previous pending states*/
/*rINTPND = BIT_EINT8_23;*/
rEINTMASK = ~(1<<9|0xf);/*enable EINT9*/
rINTMSK &= ~BIT_EINT8_23;/*enable EINT8_23*/
return;
}
④中断复位,即中断发生后要清中断,如:
rtems_isr cs8900_isr(rtems_vector_number v)
{
rEINTPEND=(1<<9);
ClearPending(BIT_EINT8_23);
cs8900_interrupt(v, g_cs);
}
针对s3c2410修改或添加c/src/libchip/network/cs8900.c,有下列内容要添加或修改:
⑤声明cs8900_device结构体,如static cs8900_device cs8900;
⑥attach cs8900_device结构体,即在函数cs8900_driver_attach的if语句前添加config->drv_ctrl=&cs8900;语句,这条语句必须添加,不然出现Driver eth0 already in use.的错误,即[printf ("Driver `%s' already in use.\n", config->name);]
⑦应用程序需要添加的东西,我开始调试的是rtems-4.6.99.3/testsuites/samples/loopback,但后来想到要从PC端PING 2410,就直接换成了调试netlink例程(rtems-4.6.99.3没有network例程,需要下载其他版本的例程),但调试了几天也没调试成功,后来看rtems-4.6.99.3下面的doc文档networking.pdf介绍了netdemo例程,又改成调netdemo。例程netdemo中需要添加networkconfig.h文件,并修改其中的rtems_bsdnet_ifconfig,rtems_bsdnet_config两个结构体.修改后的内容如下:
static char ethernet_address[6] = { 0x33, 0x44, 0x55, 0x66, 0x77, 0x88 };
static struct rtems_bsdnet_ifconfig netdriver_config = {
RTEMS_BSP_NETWORK_DRIVER_NAME, /* name */
RTEMS_BSP_NETWORK_DRIVER_ATTACH, /* attach function */
NULL, /* link to next interface */
"192.168.13.88", /* IP address */
"255.255.255.0", /* IP net mask */
ethernet_address, /* Ethernet hardware address */
0 /* Use default driver parameters */
};
struct rtems_bsdnet_config rtems_bsdnet_config = {
&netdriver_config,
NULL,
0, /* Default network task priority */
0, /* Default mbuf capacity */
0, /* Default mbuf cluster capacity */
"rtems_host", /* Host name */
"nodomain.com", /* Domain name */
"192.168.13.1", /* Gateway */
"192.168.13.11", /* Log host */
{"192.168.13.88" }, /* Name server(s) */
};
11.4 ping开始ping板子,什么反应都没有,所以找了个抓包程序,发现PC端收到的包格式有错误,收到内容如下:ff ff ff ff ff ff 33 44 55 66 77 88 08 06 00 00 00 01 08 00 06 04 00 01 33 44 55 66 77 88 c0 a8 0d 58 00 00 00 00 00 00 c0 a8 0d 0b 0b 0b 0b 0b 0b 0b…分析后发现在08 06 后面多了两个字节00 00,分析原代码(花了很长时间)发现sizeof (struct ether_header)=16(应用到此结构的代码在cpukit/libnetworking/net/if_ethersubr.c),ether_header定义如下:
struct ether_header {
u_char ether_dhost[ETHER_ADDR_LEN];/* ETHER_ADDR_LEN =6*/
u_char ether_shost[ETHER_ADDR_LEN];/**/
u_short ether_type;
};/*见cpukit/libnetworking/net/Ethernet.h*/
按理所sizeof (struct ether_header)应为14但是我printf后的结构却为16,显然多出的两个字节在此,后来问同事说是字节对齐问题,果然在ether_header结构体后加__packed __attribute__((packed))属性后
struct ether_header {
u_char ether_dhost[ETHER_ADDR_LEN];/* ETHER_ADDR_LEN =6*/
u_char ether_shost[ETHER_ADDR_LEN];/**/
u_short ether_type;
}__packed __attribute__((packed));
果然ping通了。
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