tmk_core/protocol/pjrc/usb_extra.c

   1 /* USB Keyboard Plus Debug Channel Example for Teensy USB Development Board
   2  * http://www.pjrc.com/teensy/usb_keyboard.html
   3  * Copyright (c) 2009 PJRC.COM, LLC
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a copy
   6  * of this software and associated documentation files (the "Software"), to deal
   7  * in the Software without restriction, including without limitation the rights
   8  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   9  * copies of the Software, and to permit persons to whom the Software is
  10  * furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included in
  13  * all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  18  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  21  * THE SOFTWARE.
  22  */
  23
  24 #include <util/delay.h>
  25 #include <avr/interrupt.h>
  26 #include "host.h"
  27 #include "usb_extra.h"
  28
  29
  30 int8_t usb_extra_send(uint8_t report_id, uint16_t data)
  31 {
  32         uint8_t intr_state, timeout;
  33
  34         if (!usb_configured()) return -1;
  35         intr_state = SREG;
  36         cli();
  37         UENUM = EXTRA_ENDPOINT;
  38         timeout = UDFNUML + 50;
  39         while (1) {
  40                 // are we ready to transmit?
  41                 if (UEINTX & (1<<RWAL)) break;
  42                 SREG = intr_state;
  43                 // has the USB gone offline?
  44                 if (!usb_configured()) return -1;
  45                 // have we waited too long?
  46                 if (UDFNUML == timeout) return -1;
  47                 // get ready to try checking again
  48                 intr_state = SREG;
  49                 cli();
  50                 UENUM = EXTRA_ENDPOINT;
  51         }
  52
  53         UEDATX = report_id;
  54         UEDATX = data&0xFF;
  55         UEDATX = (data>>8)&0xFF;
  56
  57         UEINTX = 0x3A;
  58         SREG = intr_state;
  59         return 0;
  60 }
  61
  62 int8_t usb_extra_consumer_send(uint16_t bits)
  63 {
  64         return usb_extra_send(REPORT_ID_CONSUMER, bits);
  65 }
  66
  67 int8_t usb_extra_system_send(uint16_t bits)
  68 {
  69         return usb_extra_send(REPORT_ID_SYSTEM, bits);
  70 }