请教 LED 灯会影响按键的问题

[gentlyj]

我参考力创开源的硬件资料， 用 stm32 和移位寄存器自己画了一个 16 键的键盘。改了下代码，就是把按键数量，led 数量改为 16 个, 烧录到机器里现象是，灯效和按键不能同时使用。如果开了灯效，hid 报告是错误的，就导致按键功能没有。我把 main.cpp while 循环里的代码注释掉， 按键功能就都正常了。

我用 bus hound capture 看， 不开灯效时，按下抬起就两个事件， log 如下：

Device Phase Data Description Cmd.Phase.Ofs(rep)

---

35.1 IN 01 00 10 00 00 00 00 00 ........ 2103.1.0(95)
35.1 IN 01 00 00 00 00 00 00 00 ........ 2198.1.0(9129)

开启灯效时，按下时会报下面一堆事件，抬起时没有：

Device Phase Data Description Cmd.Phase.Ofs(rep)

---

35.1 IN 01 00 00 00 00 00 00 00 ........ 1.1.0(1220)
35.1 IN 01 00 02 00 00 00 00 00 ........ 1221.1.0
35.1 IN 01 00 01 00 00 00 00 00 ........ 1222.1.0
35.1 IN 01 00 02 00 00 00 00 00 ........ 1223.1.0(3)
35.1 IN 01 00 01 00 00 00 00 00 ........ 1226.1.0
35.1 IN 01 00 02 00 00 00 00 00 ........ 1227.1.0(3)
35.1 IN 01 00 01 00 00 00 00 00 ........ 1230.1.0
35.1 IN 01 00 02 00 00 00 00 00 ........ 1231.1.0(3)
35.1 IN 01 00 01 00 00 00 00 00 ........ 1234.1.0
35.1 IN 01 00 02 00 00 00 00 00 ........ 1235.1.0(3)
35.1 IN 01 00 01 00 00 00 00 00 ........ 1238.1.0
35.1 IN 01 00 02 00 00 00 00 00 ........ 1239.1.0(3)
35.1 IN 01 00 01 00 00 00 00 00 ........ 1242.1.0
35.1 IN 01 00 02 00 00 00 00 00 ........ 1243.1.0(3)
35.1 IN 01 00 01 00 00 00 00 00 ........ 1246.1.0
35.1 IN 01 00 02 00 00 00 00 00 ........ 1247.1.0(3)
35.1 IN 01 00 01 00 00 00 00 00 ........ 1250.1.0
35.1 IN 01 00 02 00 00 00 00 00 ........ 1251.1.0(20)
35.1 IN 01 00 01 00 00 00 00 00 ........ 1271.1.0
35.1 IN 01 00 02 00 00 00 00 00 ........ 1272.1.0(4)
35.1 IN 01 00 01 00 00 00 00 00 ........ 1276.1.0
35.1 IN 01 00 02 00 00 00 00 00 ........ 1277.1.0(12)
35.1 IN 01 00 01 00 00 00 00 00 ........ 1289.1.0
35.1 IN 01 00 02 00 00 00 00 00 ........ 1290.1.0(4)
35.1 IN 01 00 01 00 00 00 00 00 ........ 1294.1.0
35.1 IN 01 00 02 00 00 00 00 00 ........ 1295.1.0(4)
35.1 IN 01 00 01 00 00 00 00 00 ........ 1299.1.0
35.1 IN 01 00 02 00 00 00 00 00 ........ 1300.1.0(4)
35.1 IN 01 00 01 00 00 00 00 00 ........ 1304.1.0
35.1 IN 01 00 02 00 00 00 00 00 ........ 1305.1.0(4)
35.1 IN 01 00 01 00 00 00 00 00 ........ 1309.1.0

好像循环发送了十多遍的样子， 代码看不太明白。请问这个问题可能是哪里的原因造成的？