JoystickService.h

00001 /* mbed Microcontroller Library
00002  * Copyright (c) 2015 ARM Limited
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *     http://www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00017 #include "mbed.h"
00018 
00019 #include "HIDServiceBase.h"
00020 
00021 enum ButtonState
00022 {
00023     BUTTON_UP,
00024     BUTTON_DOWN
00025 };
00026 
00027 enum JoystickButton
00028 {
00029     JOYSTICK_BUTTON_1       = 0x1,
00030     JOYSTICK_BUTTON_2       = 0x2,
00031 };
00032 
00033 report_map_t JOYSTICK_REPORT_MAP = {
00034     USAGE_PAGE(1),      0x01,         // Generic Desktop
00035     USAGE(1),           0x04,         // Joystick
00036     COLLECTION(1),      0x01,         // Application
00037     COLLECTION(1),      0x00,         //  Physical
00038     USAGE_PAGE(1),      0x09,         //   Buttons
00039     USAGE_MINIMUM(1),   0x01,
00040     USAGE_MAXIMUM(1),   0x03,
00041     LOGICAL_MINIMUM(1), 0x00,
00042     LOGICAL_MAXIMUM(1), 0x01,
00043     REPORT_COUNT(1),    0x03,         //   2 bits (Buttons)
00044     REPORT_SIZE(1),     0x01,
00045     INPUT(1),           0x02,         //   Data, Variable, Absolute
00046     REPORT_COUNT(1),    0x01,         //   6 bits (Padding)
00047     REPORT_SIZE(1),     0x05,
00048     INPUT(1),           0x01,         //   Constant
00049     USAGE_PAGE(1),      0x01,         //   Generic Desktop
00050     USAGE(1),           0x30,         //   X
00051     USAGE(1),           0x31,         //   Y
00052     USAGE(1),           0x32,         //   Z
00053     USAGE(1),           0x33,         //   Rx
00054     LOGICAL_MINIMUM(1), 0x81,         //   -127
00055     LOGICAL_MAXIMUM(1), 0x7f,         //   127
00056     REPORT_SIZE(1),     0x08,         //   Three bytes
00057     REPORT_COUNT(1),    0x04,
00058     INPUT(1),           0x02,         //   Data, Variable, Absolute (unlike mouse)
00059     END_COLLECTION(0),
00060     END_COLLECTION(0),
00061 };
00062 
00063 uint8_t report[] = { 0, 0, 0, 0, 0 };
00064 
00065 class JoystickService: public HIDServiceBase
00066 {
00067 public:
00068     JoystickService(BLE &_ble) :
00069         HIDServiceBase(_ble,
00070                        JOYSTICK_REPORT_MAP, sizeof(JOYSTICK_REPORT_MAP),
00071                        inputReport          = report,
00072                        outputReport         = NULL,
00073                        featureReport        = NULL,
00074                        inputReportLength    = sizeof(inputReport),
00075                        outputReportLength   = 0,
00076                        featureReportLength  = 0,
00077                        reportTickerDelay    = 20),
00078         buttonsState (0),
00079         failedReports (0)
00080     {
00081         speed[0] = 0;
00082         speed[1] = 0;
00083         speed[2] = 0;
00084         speed[3] = 0;
00085 
00086         startReportTicker();
00087     }
00088 
00089     int setSpeed(int8_t x, int8_t y, int8_t z)
00090     {
00091         speed[0] = x;
00092         speed[1] = y;
00093         speed[2] = z;
00094 
00095         return 0;
00096     }
00097 
00098     int setButton(JoystickButton button, ButtonState state)
00099     {
00100         if (state == BUTTON_UP)
00101             buttonsState &= ~(button);
00102         else
00103             buttonsState |= button;
00104 
00105         return 0;
00106     }
00107 
00108     virtual void sendCallback(void) {
00109         if (!connected)
00110             return;
00111 
00112         report[0] = buttonsState & 0x7;
00113         report[1] = speed[0];
00114         report[2] = speed[1];
00115         report[3] = speed[2];
00116         report[4] = speed[3];
00117 
00118         if (send(report))
00119             failedReports++;
00120     }
00121 
00122 protected:
00123     uint8_t buttonsState;
00124     uint8_t speed[4];
00125 
00126 public:
00127     uint32_t failedReports;
00128 };
00129