从结构can_框架检索选项卡中的十六进制argv[]
我正在开发socket CAN,并实现以下代码:从结构can_框架检索选项卡中的十六进制argv[],c,arrays,segmentation-fault,can-bus,socketcan,C,Arrays,Segmentation Fault,Can Bus,Socketcan,我正在开发socket CAN,并实现以下代码: int main(int argc, char **argv) { char *sendSoc = NULL; char *receiveSoc = NULL; char specifiedType; struct can_frame sendFrame; struct can_frame receiveFrame; int sendSocket=-1, receiveSocket=-1; int can_id; int type=-1; in
int main(int argc, char **argv)
{
char *sendSoc = NULL;
char *receiveSoc = NULL;
char specifiedType;
struct can_frame sendFrame;
struct can_frame receiveFrame;
int sendSocket=-1, receiveSocket=-1;
int can_id;
int type=-1;
int dat,k=0,iter=0, sendCount, interval;
struct can_filter sendSocket_filter;
struct can_filter receiveSocket_filter;
unsigned long long value = 0;
if (argc < 8)
{
fprintf(stderr, "Usage: %s [<canSendInterface>] [<canReceiveInterface>] <id> <type> <interval(µs)> <sendCount> <can-msg>\n"
"<id> identifier=ID CAN Identifier\n"
"<type> type is 's' for standard and 'e' for extended frame\n"
"<interval(us)> send message repetition rate\n"
"<sendCount> send message COUNT times\n"
"<can-msg> can consist of up to 8 bytes given as a space separated list - data must be in hexadecimal\n"
" <data0> <data1> <data2> <data3> <data4> <data5> <data6> <data7>",
argv[0]);
return 1;
}
sendSoc = argv[1];
receiveSoc = argv[2];
sscanf(argv[3], "%x", (unsigned int *) & sendFrame.can_id);
sendFrame.can_dlc = 8;
sendSocket_filter.can_id = sendFrame.can_id;
receiveSocket_filter.can_id = sendFrame.can_id;
sscanf(argv[4], "%c", &specifiedType);
if( specifiedType == 's')
{
type = STANDARD;
sendSocket_filter.can_mask = 0x000007ff;
receiveSocket_filter.can_mask = 0x000007ff;
}
else if( specifiedType == 'e')
{
type = EXTENDED;
sendSocket_filter.can_mask = 0x1fffffff;
receiveSocket_filter.can_mask = 0x1fffffff;
}
else
{
printf("Bad Type Entered \n");
}
interval = atoi(argv[5]);
sendCount = atoi(argv[6]);
if( (type == STANDARD) && (sendFrame.can_id > 0x7ff) )
{
printf("Error: CAN-ID too big for standard frame \n");
exit(-1);
}
if( (type == EXTENDED) && (sendFrame.can_id > 0x1fffffff) )
{
printf("Error: CAN-ID too big for extended frame \n");
exit(-1);
}
printf("here\n");
for(k=0; k<9; k++)
{
sscanf(argv[7+k], "%x", &dat);
sendFrame.data[k] = (unsigned char)(dat & 0xff);
printf("sendFrame.data[%d] vaut %d\n",k,sendFrame.data[k]);
}
printf("test\n");
return 0;
}
在can.h中,结构为:
52 * struct can_frame - basic CAN frame structure
53 * @can_id: the CAN ID of the frame and CAN_*_FLAG flags, see above.
54 * @can_dlc: the data length field of the CAN frame
55 * @data: the CAN frame payload.
56 */
57 struct can_frame {
58 canid_t can_id; /* 32 bit CAN_ID + EFF/RTR/ERR flags */
59 __u8 can_dlc; /* data length code: 0 .. 8 */
60 __u8 data[8] __attribute__((aligned(8)));
61 };
目前我不明白为什么会出现这种分段错误。其目的是通过专用插座在CAN上发送这些值
使用for循环提前感谢:
for(k=0; k<9; k++)
{
sscanf(argv[7+k], "%x", &dat);
sendFrame.data[k] = (unsigned char)(dat & 0xff);
printf("sendFrame.data[%d] vaut %d\n",k,sendFrame.data[k]);
}
因此,argv数组中的最后一个元素是argv[14]
分段错误来自对argv[15]
的访问,它是argv
数组中不存在的元素
sendFrame.data
也有相同的错误。该数组定义了8个元素的长度,并带有for循环
for(k=0; k<9; k++)
for(k=0;k)非常简单!谢谢你MOHAMED。这通常是一个需要时间的简单问题--“代码只检查8个必需参数。因此for(k=0;k
./scriptname can0 can1 0x1ffff e 10 5 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x1E
[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14]
for(k=0; k<9; k++)