crclib软件包使用

发布于 2024-05-29 00:11:21 浏览：302 订阅该版

最近在使用modbus的传感器，需要使用crc校验来防止数据跑飞。今天我试了一下crclib中的crc16_cyc_cal函数来校验。校验能正常运行，但是跑一段时间后就会爆栈。根据我多次测试，发现它每次都是执行该函数57次后爆栈（我的待处理数据每次是9个，爆栈的时候最后一个会丢，算起来每次都是处理了512个后爆栈）。我尝试过增加堆栈和数组大小，但还是会在执行57次后爆栈。源代码在未添加crc校验的时候可以一直获取数据并执行。孩子是真搞不懂了o(╥﹏╥)o

1.crc校验我是放在串口接收线程里的

```c
void serial_thread_entry(void *parameter)
{
  char buffer[1024]={0};
  int High;
  int Low;
  int i;
  u16 crc16_rst;
  //char crctest[7]={0x03,0x03,0x04,0x00,0xF6,0x02,0xF1};
  //char buffer[];
 while (1)
 {
     rt_sem_take(&sem,RT_WAITING_FOREVER);
     len = rt_device_read(u3_dev,0,&buffer,rx_len);
     crc16_rst=crc16_cyc_cal(0xffff,&buffer,len-2);
     High=(crc16_rst>>8)&0xFF;
     Low =crc16_rst&0xFF;
        if(High==buffer[len-1] && Low==buffer[len-2])
        {
            if(buffer[0]==0x03)
               {
                   temp1=((buffer[3]<< 8)|buffer[4])/10;
                   temp2=((buffer[3]<< 8)|buffer[4])%10;
                   humi1=((buffer[5]<< 8)|buffer[6])/10;
                   humi2=((buffer[5]<< 8)|buffer[6])%10;
               }
        }
//    if(buffer[0]==0x03)
//                  {
//                      temp1=((buffer[3]<< 8)|buffer[4])/10;
//                      temp2=((buffer[3]<< 8)|buffer[4])%10;
//                      humi1=((buffer[5]<< 8)|buffer[6])/10;
//                      humi2=((buffer[5]<< 8)|buffer[6])%10;
//                  }
     //buffer[len]='\0';
//     rt_kprintf("%s",buffer);
//     rt_kprintf("%d",len);
     for(i = 0; i < len; i++) {
                     rt_kprintf("%02X ", buffer[i]);
                     }
     rt_kprintf("crc16_ex_cal result = 0x%02X,0x%02X\n",High,Low);
//    memset(buffer, 0, sizeof (buffer));
//     rt_kprintf("cbufferrc16_ex_cal result = 0x%02X,0x%02X\n",buffer[len-1],buffer[len-2]);
//   rt_kprintf("temp=%d.%d,humi=%d.%d\r\n",temp1,temp2,humi1,humi2);
 }
}
```

2.爆栈情况
```
 \ | /
- RT -     Thread Operating System
 / | \     5.0.2 build May 28 2024 18:40:34
 2006 - 2022 Copyright by RT-Thread team
[I/sal.skt] Socket Abstraction Layer initialize success.
[I/at.clnt] AT client(V1.3.1) on device uart2 initialize success.
msh />[I/at.dev.esp] esp0 device wifi is disconnect.
[I/at.dev.esp] esp0 device wifi is disconnect.
[I/at.dev.esp] esp0 device wifi is connected.
[I/at.dev.esp] esp0 device network initialize successfully.
[D/mqtt.sample] inter mqtt_connect_callback!
[D/mqtt] ipv4 address port: 1883
[D/mqtt] HOST = 'iot-06z00jmmozgvese.mqtt.iothub.aliyuncs.com'
903 03 04 00 EE 02 6C B8 8B crc16_ex_cal result = 0x8B,0xB8
[I/mqtt] MQTT server connect success.
[I/mqtt] Subscribe #0 /sys/k01ps5LTTA2/Device_01/thing/event/property/set OK!
[D/mqtt.sample] inter mqtt_online_callback!
903 03 04 00 EE 02 6C B8 8B crc16_ex_cal result = 0x8B,0xB8
903 03 04 00 EE 02 6B F9 49 crc16_ex_cal result = 0x49,0xF9
903 03 04 00 EF 02 6C E9 4B crc16_ex_cal result = 0x4B,0xE9
903 03 04 00 EF 02 6D 28 8B crc16_ex_cal result = 0x8B,0x28
903 03 04 00 EE 02 6D 79 4B crc16_ex_cal result = 0x4B,0x79
903 03 04 00 EF 02 6B A8 89 crc16_ex_cal result = 0x89,0xA8
903 03 04 00 EF 02 6F A9 4A crc16_ex_cal result = 0x4A,0xA9
903 03 04 00 EE 02 6D 79 4B crc16_ex_cal result = 0x4B,0x79
903 03 04 00 EE 02 6E 39 4A crc16_ex_cal result = 0x4A,0x39
903 03 04 00 EE 02 6D 79 4B crc16_ex_cal result = 0x4B,0x79
903 03 04 00 EE 02 6E 39 4A crc16_ex_cal result = 0x4A,0x39
903 03 04 00 EE 02 6E 39 4A crc16_ex_cal result = 0x4A,0x39
903 03 04 00 EE 02 6E 39 4A crc16_ex_cal result = 0x4A,0x39
903 03 04 00 EE 02 6C B8 8B crc16_ex_cal result = 0x8B,0xB8
903 03 04 00 EE 02 6E 39 4A crc16_ex_cal result = 0x4A,0x39
903 03 04 00 EF 02 6C E9 4B crc16_ex_cal result = 0x4B,0xE9
903 03 04 00 EE 02 6E 39 4A crc16_ex_cal result = 0x4A,0x39
903 03 04 00 EE 02 6B F9 49 crc16_ex_cal result = 0x49,0xF9
903 03 04 00 EE 02 6F F8 8A crc16_ex_cal result = 0x8A,0xF8
903 03 04 00 EE 02 6D 79 4B crc16_ex_cal result = 0x4B,0x79
903 03 04 00 EE 02 6C B8 8B crc16_ex_cal result = 0x8B,0xB8
903 03 04 00 EE 02 6E 39 4A crc16_ex_cal result = 0x4A,0x39
903 03 04 00 EE 02 6E 39 4A crc16_ex_cal result = 0x4A,0x39
903 03 04 00 EE 02 6C B8 8B crc16_ex_cal result = 0x8B,0xB8
903 03 04 00 EE 02 6C B8 8B crc16_ex_cal result = 0x8B,0xB8
903 03 04 00 EE 02 6F F8 8A crc16_ex_cal result = 0x8A,0xF8
903 03 04 00 EE 02 6D 79 4B crc16_ex_cal result = 0x4B,0x79
903 03 04 00 EE 02 6F F8 8A crc16_ex_cal result = 0x8A,0xF8
903 03 04 00 EE 02 6D 79 4B crc16_ex_cal result = 0x4B,0x79
903 03 04 00 EE 02 6E 39 4A crc16_ex_cal result = 0x4A,0x39
903 03 04 00 EF 02 6E 68 8A crc16_ex_cal result = 0x8A,0x68
903 03 04 00 EE 02 6D 79 4B crc16_ex_cal result = 0x4B,0x79
903 03 04 00 EF 02 6E 68 8A crc16_ex_cal result = 0x8A,0x68
903 03 04 00 EF 02 6D 28 8B crc16_ex_cal result = 0x8B,0x28
903 03 04 00 EE 02 6D 79 4B crc16_ex_cal result = 0x4B,0x79
903 03 04 00 EF 02 6D 28 8B crc16_ex_cal result = 0x8B,0x28
903 03 04 00 EF 02 6C E9 4B crc16_ex_cal result = 0x4B,0xE9
903 03 04 00 EF 02 6D 28 8B crc16_ex_cal result = 0x8B,0x28
903 03 04 00 EE 02 6A 38 89 crc16_ex_cal result = 0x89,0x38
903 03 04 00 EE 02 6A 38 89 crc16_ex_cal result = 0x89,0x38
903 03 04 00 EE 02 6B F9 49 crc16_ex_cal result = 0x49,0xF9
903 03 04 00 EF 02 68 E8 88 crc16_ex_cal result = 0x88,0xE8
903 03 04 00 EF 02 68 E8 88 crc16_ex_cal result = 0x88,0xE8
903 03 04 00 EE 02 6A 38 89 crc16_ex_cal result = 0x89,0x38
903 03 04 00 EF 02 6A 69 49 crc16_ex_cal result = 0x49,0x69
903 03 04 00 EE 02 6A 38 89 crc16_ex_cal result = 0x89,0x38
903 03 04 00 EE 02 69 78 88 crc16_ex_cal result = 0x88,0x78
903 03 04 00 EF 02 6B A8 89 crc16_ex_cal result = 0x89,0xA8
903 03 04 00 EF 02 6B A8 89 crc16_ex_cal result = 0x89,0xA8
903 03 04 00 EE 02 68 B9 48 crc16_ex_cal result = 0x48,0xB9
903 03 04 00 EF 02 6A 69 49 crc16_ex_cal result = 0x49,0x69
903 03 04 00 EF 02 6C E9 4B crc16_ex_cal result = 0x4B,0xE9
903 03 04 00 EE 02 6B F9 49 crc16_ex_cal result = 0x49,0xF9
903 03 04 00 EE 02 6B F9 49 crc16_ex_cal result = 0x49,0xF9
903 03 04 00 EE 02 6B F9 49 crc16_ex_cal result = 0x49,0xF9
803 03 04 00 EF 02 6D 28 crc16_ex_cal result = 0xE9,0x88
psr: 0x01000000
r00: 0x0000ffff
r01: 0x20020001
r02: 0x000000aa
r03: 0x20020000
r04: 0x00017c90
r05: 0x0000e6aa
r06: 0x00000076
r07: 0x20008348
r08: 0xdeadbeef
r09: 0xdeadbeef
r10: 0xdeadbeef
r11: 0xdeadbeef
r12: 0x00000000
 lr: 0x08020ecb
 pc: 0x0801a568
hard fault on thread: u3_recv

rt_thread_ thread   pri  status      sp     stack size max used left tick  error
---------- -------- ---  ------- ---------- ----------  ------  ---------- ---
0x20009adc JTH-2D1   16  suspend 0x000000c8 0x00000100    84%   0x00000005 EINTRPT
0x20008a38 cloud     16  suspend 0x0000035c 0x00001000    30%   0x0000002c EINTRPT
0x20008594 screen    16  suspend 0x00000170 0x00000400    68%   0x00000018 EINTRPT
0x20007cf0 u3_recv   10  running 0x000002cc 0x00000800    39%   0x00000019 OK     
0x20006834 mqtt0     10  suspend 0x00000228 0x00001000    33%   0x00000002 OK     
0x20004fe8 at_clnt    9  suspend 0x00000114 0x00000600    67%   0x00000003 EINTRPT
0x20003b08 tshell    20  suspend 0x000000ec 0x00001000    06%   0x00000009 EINTRPT
0x20002ff4 sys work  23  suspend 0x00000110 0x00000800    62%   0x00000004 OK     
0x20000e5c tidle0    31  ready   0x00000074 0x00000100    78%   0x00000001 OK     
0x20001178 timer      4  suspend 0x00000080 0x00000200    37%   0x00000009 OK     
bus fault:
SCB_CFSR_BFSR:0x82 PRECISERR SCB->BFAR:20020000
```