usb-vcom的问题

发布于 2019-05-12 17:06:34 浏览：2687 订阅该版

硬件：LPC1759
编译器：MDK5.14
RTTHREAD版本：rtthread-3.1.2

问题描述：
使用scons工具创建了mdk5工程，具有usb-vcoom，CAN总线,I2C总线等外围接口。

使用VCOM时，finsh出现了如下错误：
```
 \ | /
- RT -     Thread Operating System
 / | \     4.0.1 build May 10 2019
 2006 - 2019 Copyright by rt-thread team
do components initialization.
initialize rti_board_end:0 done
initialize rt_usbd_vcom_class_register:0 done
initialize rt_i2c_core_init:0 done
initialize libc_system_init:0 done
initialize finsh_system_init:0 done
endpoint assign error
endpoint assign error
psr: 0x61000000
r00: 0x00000000
r01: 0x00000001
r02: 0x1000690c
r03: 0x10007130
r04: 0x10006958
r05: 0x10007010
r06: 0x1000690c
r07: 0x10006a80
r08: 0x10007010
r09: 0x10007130
r10: 0x10006a80
r11: 0x10007130
r12: 0x0000c329
 lr: 0x0000c7a5
 pc: 0x0000c7a4
hard fault on thread: init

thread   pri  status      sp     stack size max used left tick  error
-------- ---  ------- ---------- ----------  ------  ---------- ---
vcom      16  ready   0x00000044 0x00000200    13%   0x00000014 000
usbd       8  suspend 0x000000a4 0x00001000    04%   0x00000014 000
tshell    20  ready   0x00000040 0x00001000    01%   0x0000000a 000
init      10  running 0x000000a0 0x00000800    16%   0x00000014 000
tshell    20  ready   0x00000040 0x00001000    01%   0x0000000a 000
tidle0    31  ready   0x00000040 0x00000200    12%   0x00000020 000
timer      4  suspend 0x00000058 0x00000200    17%   0x0000000a 000
main      10  close   0x00000068 0x00000800    12%   0x00000014 000
bus fault:
SCB_CFSR_BFSR:0x04 IMPRECISERR 
```
进入调试模式后发现，    `RT_ASSERT(device->dcd->ep_pool != RT_NULL);        `
`device->dcd->ep_pool`为NULL，没有初始化？
USB的初始化加在哪个地方合适？