CV Engineer Keyboard (self-made)

[Reference Project](https://oshwhub.com/pomin/diy-jian-pan)
![image.png] `
```
void KeyAction(unsigned char keyCode) {
switch(Key_msg) {
case 1://Find the value in key.h, corresponding to the keyboard letter

HIDKey[0] = 0x29; ///HIDKey[0] is for Ctrl, Shift, Alt, etc. Here it is the left Ctrl 0x01
HIDKey[2] = 0x29; // HIDKey[2]-HIDKey[7] are the first to sixth keys pressed, here 0x06 is c
if(Ready) //HIDValueHandleMul();
HIDValueHandle();// Ordinary key upload
else USBDeviceInit();
break;
case 2:
HIDKey[0] = 0x01;
HIDKey[2] = 0x04;
if(Ready)
HIDValueHandle();
else USBDeviceInit();
break;
case 3:
HIDKey[0] = 0x01; //
HIDKey[2] = 0x16; //
if(Ready) //HIDValueHandleMul();
HIDValueHandle();// Ordinary key upload
else USBDeviceInit();
break;

case 4:
HIDKey[0] = 0x01;
HIDKey[2] = 0x1D;
if(Ready)
HIDValueHandle();// Normal key uploadelse
USBDeviceInit();
break;

case 5:
HIDKey[0] = 0x01; //
HIDKey[2] = 0x06; //
if(Ready) //HIDValueHandleMul();
HIDValueHandle();// Normal key uploadelse
USBDeviceInit();
break;
case 6:
HIDKey[0] = 0x01; //
HIDKey[2] = 0x19; //
if(Ready) //HIDValueHandleMul();
HIDValueHandle();// Normal key uploadelse
USBDeviceInit();
break;

case 7:
HIDKeyMUL[0] = KEY_MUL_VOL_ZERO; // Mute (EC11 is pressed)
if(Ready) HIDValueHandleMul();
else USBDeviceInit();
break;
case 21:
HIDKeyMUL[0] = KEY_MUL_VOL_UP; // Volume +
if(Ready) HIDValueHandleMul();
else USBDeviceInit();
break;
case 22:
HIDKeyMUL[0] = KEY_MUL_VOL_DOWN; // Volume - (EC11 knob)
if(Ready) HIDValueHandleMul();
else USBDeviceInit();
break;
default :
break;
}
}
```
`