Add system properties.

right/src/usb_protocol_handler.c

@@ -1,18 +1,41 @@
 #include "usb_protocol_handler.h"
+#include "system_properties.h"
 #include "test_led.h"
 
-void GetProtocolVersion();
+void SetError(uint8_t error);
+void SetGenericError();
+void UsbProtocolHandler();
+void GetSystemProperty();
 void JumpToBootloader();
 void GetSetTestLed();
 void WriteLedDriver();
 void ReadLedDriver();
 
+// Functions for setting error statuses
+
+void SetError(uint8_t error) {
+    GenericHidOutBuffer[0] = error;
+}
+
+void SetGenericError()
+{
+    SetError(PROTOCOL_RESPONSE_GENERIC_ERROR);
+}
+
+// Set a single byte as the response.
+void SetResponseByte(uint8_t response)
+{
+    GenericHidOutBuffer[1] = response;
+}
+
+// The main protocol handler function
+
 void UsbProtocolHandler()
 {
     uint8_t command = GenericHidInBuffer[0];
     switch (command) {
-        case USB_COMMAND_GET_PROTOCOL_VERSION:
-            GetProtocolVersion();
+        case USB_COMMAND_GET_SYSTEM_PROPERTY:
+            GetSystemProperty();
             break;
         case USB_COMMAND_JUMP_TO_BOOTLOADER:
             JumpToBootloader();
@@ -31,8 +54,28 @@ void UsbProtocolHandler()
     }
 }
 
-void GetProtocolVersion() {
-    GenericHidOutBuffer[1] = 1;
+// Per command protocol command handlers
+
+void GetSystemProperty() {
+    uint8_t propertyId = GenericHidInBuffer[1];
+
+    switch (propertyId) {
+        case SYSTEM_PROPERTY_USB_PROTOCOL_VERSION_ID:
+            SetResponseByte(SYSTEM_PROPERTY_USB_PROTOCOL_VERSION);
+            break;
+        case SYSTEM_PROPERTY_BRIDGE_PROTOCOL_VERSION_ID:
+            SetResponseByte(SYSTEM_PROPERTY_BRIDGE_PROTOCOL_VERSION);
+            break;
+        case SYSTEM_PROPERTY_DATA_MODEL_VERSION_ID:
+            SetResponseByte(SYSTEM_PROPERTY_DATA_MODEL_VERSION);
+            break;
+        case SYSTEM_PROPERTY_FIRMWARE_VERSION_ID:
+            SetResponseByte(SYSTEM_PROPERTY_FIRMWARE_VERSION);
+            break;
+        default:
+            SetGenericError();
+            break;
+    }
 }
 
 void JumpToBootloader() {