请问为什么sprintf 打印浮点数就会 hard fault...

发布于 2021-09-04 22:20:37 浏览：843 订阅该版

请问为啥我用 sprintf 或者sscanf只要参数中有浮点数就会 hard fault
```c
        double a, b, c;
        a = 1.111;
        b = 2.222;
        c = a+b;
        sprintf(gps_buf, "%f %f %f\r\n", a, b, c);
```
只要执行到 sprintf
```
msh >psr: 0x01010000
r00: 0x00000001
r01: 0x00018608
r02: 0x00000008
r03: 0x00000208
r04: 0x20004030
r05: 0x00016768
r06: 0x08000000
r07: 0x00000208
r08: 0xdeadbeef
r09: 0xdeadbeef
r10: 0xdeadbeef
r11: 0xdeadbeef
r12: 0xffffffff
 lr: 0x000117cf
 pc: 0x000117de
hard fault on thread: gps_task

thread   pri  status      sp     stack size max used left tick  error
-------- ---  ------- ---------- ----------  ------  ---------- ---
gps_task  30  running 0x000001b8 0x00000800    39%   0x0000000a 000
a1        30  suspend 0x000000b0 0x00000200    34%   0x00000005 000
tshell    20  suspend 0x000000d0 0x00001000    05%   0x0000000a 000
tidle0    31  ready   0x00000060 0x00000200    23%   0x00000005 000
main      10  suspend 0x000000cc 0x00000800    14%   0x00000013 000
usage fault:
SCB_CFSR_UFSR:0x08 NOCP
```