Hi @FuadPurnomo
Indeed the examples provided by @TDK are interesting, you need to configure the USB device with two interfaces:
- CDC ACM interface (for serial communication)
- HID Keyboard interface (for keyboard reports)
You can refer to this article on how to Implement a USB HID keyboard device USB descriptors must reflect this composite device (2 interfaces). Regarding USBX, examples for CDC ACM exist (e.g., Ux_Device_CDC_ACM example for H533).
- Your CDC read thread usbx_cdc_acm_read_thread_entry already reads incoming data into a buffer.
for (int i = 0; i < actual_length; i++)
{
if (UserRxBufferFS[i] == 'F')
{
// Generate a high-going pulse on a GPIO pin
HAL_GPIO_WritePin(GPIOx, GPIO_PIN_y, GPIO_PIN_SET);
HAL_Delay(10); // 10 ms pulse, adjust as needed
HAL_GPIO_WritePin(GPIOx, GPIO_PIN_y, GPIO_PIN_RESET);
}
}
Or triggering a hardware timer or PWM pulse if you want precise timing.
2. Adjust function calls based on USBX HID keyboard API.
// Prepare keyboard HID report for F8 key press
keyboardHID keyboardhid = {0};
keyboardhid.KEYCODE1 = 0x41; // Check HID usage ID for F8 from table section 10 Keyboard/Keypad Page (0x07) in https://usb.org/sites/default/files/hut1_21.pdf
// Send key press
ux_device_class_hid_event_set(hid_keyboard, (UX_SLAVE_CLASS_HID_EVENT *)&keyboardhid);
// Small delay to simulate key press duration to be adjusted to avoid debounce effect
HAL_Delay(10);
// Send key release (all zeros)
memset(&keyboardhid, 0, sizeof(keyboardhid));
ux_device_class_hid_event_set(hid_keyboard, (UX_SLAVE_CLASS_HID_EVENT *)&keyboardhid);
}
}
- Use HAL_GetTick() or a hardware timer for accurate timing instead of blocking delays.
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