请翻开《Device Class Definition for Human Interface Devices (HID) Version 1.11 》7.2.2 Set_Report Request
![USB之HID类Set_Report Request[调试手记1]](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhCekwybHRZV2RsY3pJd01UY3VZMjVpYkc5bmN5NWpiMjB2WW14dlp5ODVNalF5Tmpjdk1qQXhOekE0THpreU5ESTJOeTB5TURFM01EZ3hOVEUyTWpFek1qVXlNUzAxTWprd01UQXdOVGd1Y0c1bi5qcGc%3D.jpg?w=700&webp=1 "USB之HID类Set_Report Request[调试手记1]")
![USB之HID类Set_Report Request[调试手记1]](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhCekwybHRZV2RsY3pJd01UY3VZMjVpYkc5bmN5NWpiMjB2WW14dlp5ODVNalF5Tmpjdk1qQXhOekE0THpreU5ESTJOeTB5TURFM01EZ3hOVEUzTVRJeU5USTBNQzB4TmpFeU16TTBPREExTG5CdVp3PT0uanBn.jpg?w=700&webp=1 "USB之HID类Set_Report Request[调试手记1]")
![USB之HID类Set_Report Request[调试手记1]](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhCekwybHRZV2RsY3pJd01UY3VZMjVpYkc5bmN5NWpiMjB2WW14dlp5ODVNalF5Tmpjdk1qQXhOekE0THpreU5ESTJOeTB5TURFM01EZ3hOVEUzTVRNME1ESTBNQzAwTmpnd09EZzFOVGt1Y0c1bi5qcGc%3D.jpg?w=700&webp=1 "USB之HID类Set_Report Request[调试手记1]")
现在我们先那键盘来做实验来观察。[备注:测试当时NUM指示灯亮]
通过笔记本上按“capslock”按键来观察外置键盘上大小写的指示灯。
通过USBlyzer观察到
发送03的时候大小指示灯为亮
![USB之HID类Set_Report Request[调试手记1]](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhCekwybHRZV2RsY3pJd01UY3VZMjVpYkc5bmN5NWpiMjB2WW14dlp5ODVNalF5Tmpjdk1qQXhOekE0THpreU5ESTJOeTB5TURFM01EZ3hOVEUyTWpjeU9ERTJNaTB5TVRBM01UYzVOekUxTG5CdVp3PT0uanBn.jpg?w=700&webp=1 "USB之HID类Set_Report Request[调试手记1]")
发送01的时候大小指示灯为灭 ![USB之HID类Set_Report Request[调试手记1]](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhCekwybHRZV2RsY3pJd01UY3VZMjVpYkc5bmN5NWpiMjB2WW14dlp5ODVNalF5Tmpjdk1qQXhOekE0THpreU5ESTJOeTB5TURFM01EZ3hOVEUyTWpnME5EZ3hPQzB4TXpNd01URTNOakF4TG5CdVp3PT0uanBn.jpg?w=700&webp=1 "USB之HID类Set_Report Request[调试手记1]")
那我们继续测试
如果是按外部键盘的按“capslock”按键来观察外置键盘上大小写的指示灯。
发现和之前比较多了红色框中的部分
发送03的时候大小指示灯为亮
![USB之HID类Set_Report Request[调试手记1]](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhCekwybHRZV2RsY3pJd01UY3VZMjVpYkc5bmN5NWpiMjB2WW14dlp5ODVNalF5Tmpjdk1qQXhOekE0THpreU5ESTJOeTB5TURFM01EZ3hOVEUyTXpJeE1UY3lOUzB4TWpRM01UazRPREUwTG5CdVp3PT0uanBn.jpg?w=700&webp=1 "USB之HID类Set_Report Request[调试手记1]")
发送01的时候大小指示灯为灭![USB之HID类Set_Report Request[调试手记1]](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhCekwybHRZV2RsY3pJd01UY3VZMjVpYkc5bmN5NWpiMjB2WW14dlp5ODVNalF5Tmpjdk1qQXhOekE0THpreU5ESTJOeTB5TURFM01EZ3hOVEUyTXpRd01UWTBOaTB6TlRVek5UazBOalV1Y0c1bi5qcGc%3D.jpg?w=700&webp=1 "USB之HID类Set_Report Request[调试手记1]")
好了现在我们使用Bus Hound来发送Set_Report Request并观察其是否指示灯正常的变化
![USB之HID类Set_Report Request[调试手记1]](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhCekwybHRZV2RsY3pJd01UY3VZMjVpYkc5bmN5NWpiMjB2WW14dlp5ODVNalF5Tmpjdk1qQXhOekE0THpreU5ESTJOeTB5TURFM01EZ3hOVEUyTXpreE9EUXhNaTB4TmpFMU9UVXpNVGcwTG5CdVp3PT0uanBn.jpg?w=700&webp=1 "USB之HID类Set_Report Request[调试手记1]")
![USB之HID类Set_Report Request[调试手记1]](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhCekwybHRZV2RsY3pJd01UY3VZMjVpYkc5bmN5NWpiMjB2WW14dlp5ODVNalF5Tmpjdk1qQXhOekE0THpreU5ESTJOeTB5TURFM01EZ3hOVEUyTkRBeU1UUXhNaTA1TURNNU1qVTJNakV1Y0c1bi5qcGc%3D.jpg?w=700&webp=1 "USB之HID类Set_Report Request[调试手记1]")
![USB之HID类Set_Report Request[调试手记1]](https://image.shishitao.com:8440/aHR0cHM6Ly9iYnNtYXguaWthZmFuLmNvbS9zdGF0aWMvTDNCeWIzaDVMMmgwZEhCekwybHRZV2RsY3pJd01UY3VZMjVpYkc5bmN5NWpiMjB2WW14dlp5ODVNalF5Tmpjdk1qQXhOekE0THpreU5ESTJOeTB5TURFM01EZ3hOVEUyTlRJek5qVXpOeTB4Tmpnek9ESXlOamc1TG5CdVp3PT0uanBn.jpg?w=700&webp=1 "USB之HID类Set_Report Request[调试手记1]")