diff options
Diffstat (limited to 'Demos/Device/ClassDriver/Keyboard/Keyboard.c')
| -rw-r--r-- | Demos/Device/ClassDriver/Keyboard/Keyboard.c | 24 |
1 files changed, 18 insertions, 6 deletions
diff --git a/Demos/Device/ClassDriver/Keyboard/Keyboard.c b/Demos/Device/ClassDriver/Keyboard/Keyboard.c index ea373a802..2918f5a67 100644 --- a/Demos/Device/ClassDriver/Keyboard/Keyboard.c +++ b/Demos/Device/ClassDriver/Keyboard/Keyboard.c @@ -144,22 +144,34 @@ bool CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDIn uint8_t JoyStatus_LCL = Joystick_GetStatus();
uint8_t ButtonStatus_LCL = Buttons_GetStatus();
+ static uint8_t PrevUsedKeyCodes;
+ uint8_t UsedKeyCodes = 0;
+
if (JoyStatus_LCL & JOY_UP)
- KeyboardReport->KeyCode[0] = 0x04; // A
+ KeyboardReport->KeyCode[UsedKeyCodes++] = 0x04; // A
else if (JoyStatus_LCL & JOY_DOWN)
- KeyboardReport->KeyCode[0] = 0x05; // B
+ KeyboardReport->KeyCode[UsedKeyCodes++] = 0x05; // B
if (JoyStatus_LCL & JOY_LEFT)
- KeyboardReport->KeyCode[0] = 0x06; // C
+ KeyboardReport->KeyCode[UsedKeyCodes++] = 0x06; // C
else if (JoyStatus_LCL & JOY_RIGHT)
- KeyboardReport->KeyCode[0] = 0x07; // D
+ KeyboardReport->KeyCode[UsedKeyCodes++] = 0x07; // D
if (JoyStatus_LCL & JOY_PRESS)
- KeyboardReport->KeyCode[0] = 0x08; // E
+ KeyboardReport->KeyCode[UsedKeyCodes++] = 0x08; // E
if (ButtonStatus_LCL & BUTTONS_BUTTON1)
- KeyboardReport->KeyCode[0] = 0x09; // F
+ KeyboardReport->KeyCode[UsedKeyCodes++] = 0x09; // F
+ /* The host will ignore the device if we add a new keycode to the report while another keycode is currently
+ * being sent (i.e. the user has pressed another key while a key is already being pressed) - we need to intersperse
+ * the two reports with a zeroed report to force the host to accept the additional keys */
+ if (UsedKeyCodes != PrevUsedKeyCodes)
+ {
+ memset(KeyboardReport, sizeof(USB_KeyboardReport_Data_t), 0x00);
+ PrevUsedKeyCodes = UsedKeyCodes;
+ }
+
*ReportSize = sizeof(USB_KeyboardReport_Data_t);
return false;
}
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