Created new functions for handling commands

src/controllers/DasKeyboard.rs

@@ -1,23 +1,24 @@
 /*****************************************************************************
  * Module: DasKeyboard
  * Created On: Fri 07 May 2021 10:17:24 PM CEST
- * Last Modified: Fri 07 May 2021 11:28:01 PM CEST
+ * Last Modified: Sat 08 May 2021 10:14:52 PM CEST
  *
  * Driver for DasKeyboard keyboards light
  * Jali <jali@orca-central.de>
  *****************************************************************************/
 
-use std::ffi::{CStr, CString};
 use hidapi::{DeviceInfo, HidApi, HidError, HidResult};
+use std::ffi::{CStr, CString};
+use Usb::UsbDevice;
 
 /** Driver for DasKeyboard RGB keyboards
  *  lighting controller
  */
 pub struct DasKeyboardController {
-    dev: DeviceInfo,
-    location: CString,
-    use_traditional_send_data: bool,
-    version: String,
+    _dev: UsbDevice,
+    _location: CString,
+    _use_traditional_send_data: bool,
+    _version: String,
 }
 
 /** Implementation of the controller. */
@@ -31,28 +32,52 @@ impl DasKeyboardController {
      * * `vendor_id` - The unique vendor/manufactorer id of the device
      * * `product_id` - The unique product id of the device.
      */
-    pub fn new(vendor_id: u16, product_id: u16) -> HidResult<DasKeyboardController> {
-        match HidApi::new() {
-            Ok(api) => {
-                let device = api.device_list()
-                    .find(d => d.vendor_id() == vendor_id && d.product_id() == product_id);
+    pub fn new(vendor_id: u16, product_id: u16) -> HidResult<DasKeyboardController> {}
 
-                match device {                    
-                    Some(d) => {
-                        let c = DasKeyboardController {
-                            dev      = d,
-                            location = d.path()
-                        };
-                        Ok(c)
-                    },
-                    None => {
-                        Err(HidApiError("Could not open device"))
+    /** Send a command to the HID controller in the traditional way,
+     * sending 8 bytes per call.
+     *
+     * # Arguments
+     *
+     * * `api` - Reference to the HidApi object.
+     * * `device_info` - Reference to the device to write to.
+     */
+    fn send_data_traditional(usb_device: &UsbDevice, data: &[u8]) {
+        // traditional send_data (split into chunks of 8 bytes)
+        let mut usb_buf = [0u8; 9];
+        let err_cnt = 3;
+        let chk_sum = 0;
+        
+        usb_device.open().and_then(|dev| {
+            for idx in (1..data.len() + 1).step_by(7) {
+                usb_buf[0] = 1;
+                for fld_idx in (1..7) {
+                    let tmp_idx = idx + fld_idx -1;
+                    if tmp_idx < length {
+                        usb_buf[fld_idx] = data[tmp_idx];
+                        chk_sum ^= data[tmp_idx];
+                    }
+                    else if tmp_idx == data.len() {
+                        usb_buf[fld_idx] = chk_sum;
+                    }
+                    else {
+                        usb_buf[fld_idx] = 0
+                    }
+                }
+                match dev.send_feature_report(usb_buf) {
+                    Ok(_) {
+                        ()
+                    },
+                    Err(_) {
+                        idx = 0;
+                        if err_cnt == 0 {
+                            return ();
+                        }
+                        err_cnt -= 1;
+                        ()
                     }
                 }
-            },
-            Err(e) => {
-                e
             } 
-        }
+        })
     }
 }

src/controllers/Usb.rs

@@ -0,0 +1,53 @@
+/*****************************************************************************
+ * Module: UsbDevice
+ * Created On: Sat 08 May 2021 08:18:46 PM CEST
+ * Last Modified: Sat 08 May 2021 09:08:34 PM CEST
+ *
+ * Driver for DasKeyboard keyboards light
+ * Jali <jali@orca-central.de>
+ *****************************************************************************/
+
+use hidapi::{DeviceInfo, HidApi, HidDevice HidResult};
+
+/** Wrapper class for a usb device. 
+ * Provides an instance of the HidApi and
+ * the device info for a specific device.
+ *
+ * This allows opening and closing the device at 
+ * any time.
+ * This class is local to teh controllers module.
+ */
+pub struct UsbDevice {
+    _api: HidApi,
+    _device_info: DeviceInfo
+}
+
+/* implementation for the UsbDevice struct */
+impl UsbDevice {
+    /** Creates a new instance of the UsbDevice
+     * 
+     * # Arguments
+     *
+     * `vendor_id` - A unique id that identifies the vendor of the USB device.
+     * `product_id` - A unique id that identifies a product from the given vendor.
+     *
+     * # Returns
+     *
+     * A new instance of USBDevice, or None, if the device does not exist.
+     */
+    pub fn new(vendor_id: u16, product_id: u16) -> HidResult<UsbDevice> {
+        let api = HidApi::new();
+            api.and_then(|api: HidResult<HidApi>| api)
+            .and_then(|api: HidApi| api.device_list())
+            .find(|device| device.vendor_id() == vendor_id && device.product_id() == product_id)
+            .and_then(|device| UsbDevice {
+                _api = api,
+                _device_info = device
+            })
+    }
+
+    /** Opens the device and returns a handle to work with. */
+    pub fn open(&self) -> HidResult<HidDevice> {
+        return self._device_info.open_device(self._api);
+    }
+}

src/controllers/mod.rs

@@ -2,9 +2,10 @@
  * Definition of module controllers
  *
  * Created On: Fri 07 May 2021 09:19:14 PM CEST
- * Last Modified: Fri 07 May 2021 09:19:14 PM CEST
+ * Last Modified: Sat 08 May 2021 09:09:46 PM CEST
  */
 
 mod DasKeyboard;
 pub use DasKeyboard::DasKeyboardController;
 
+mod Usb;