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请问254x 2541 用作HID当键盘的时候,怎么加延迟delay?

在hid ble键盘例子中

我想顺序发送多个按键,按键之间加上delay延迟,ms或者s...

用的两个方法

1.for循环--

2.asm("NOP")

都不行,会导致程序挂掉...

有没有可实现delay延迟的办法,求大神赐教...