rt-thread 系统的不按套路报错

发布于 2019-07-12 14:19:53 浏览：2036 订阅该版

昨天晚上写了一个工程，基于正点原子官网的程序，加了个delay_ms和delay_us的程序，当场测试，程序跑通的，但是几天早上上来就直接报错了 \ | /- RT -     Thread Operating System
 / | \     4.0.2 build Jul 10 2019
 2006 - 2019 Copyright by rt-thread team
msh >LAN8720:100Mb/s FullDuplex

LAN8720_Init ok!

psr: 0x21000000
r00: 0xf00fe019
r01: 0x00000066
r02: 0x00000002
r03: 0x00000cc0
r04: 0x80000000
r05: 0x00000000
r06: 0x24000c7c
r07: 0x0000002a
r08: 0x00000000
r09: 0x240081a0
r10: 0x240081c7
r11: 0x240081a4
r12: 0x00000000
 lr: 0x0800b203
 pc: 0x08005788
hard fault on thread: lwip_ini

thread   pri  status      sp     stack size max used left tick  error
-------- ---  ------- ---------- ----------  ------  ---------- ---
lwip_ini  25  running 0x00000150 0x00000400    53%   0x00000001 000
tshell    20  suspend 0x00000088 0x00001000    03%   0x0000000a 000
tidle0    31  ready   0x00000048 0x00000400    07%   0x00000020 000
main      10  suspend 0x00000094 0x00000800    12%   0x00000013 000
FPU active!

bus fault:
SCB_CFSR_BFSR:0x04 IMPRECISERR

查了半天，IIC的初始化没有跑起来，然后我就换了个官方的程序延时，
void delay_us(uint32_t us)
{
	rt_uint32_t ticks;
    rt_uint32_t told, tnow, tcnt = 0;
    rt_uint32_t reload = SysTick->LOAD;

ticks = us * reload / (1000000 / RT_TICK_PER_SECOND);
    told = SysTick->VAL;
    while (1)
    {
        tnow = SysTick->VAL;
        if (tnow != told)
        {
            if (tnow < told)
            {
                tcnt += told - tnow;
            }
            else
            {
                tcnt += reload - tnow + told;
            }
            told = tnow;
            if (tcnt >= ticks)
            {
                break;
            }
        }
    }
}

一换上去又可以跑起来了，然后我放着它跑一段时间，还是没有崩。到了下午，一上电，直接就出现上面的那一段报错的字符，我现在在纠结还是要还是要不要换延时函数