src/main/drivers/usb_io.c

   1 /*
   2  * This file is part of Cleanflight.
   3  *
   4  * Cleanflight is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * Cleanflight is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with Cleanflight.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <stdbool.h>
  19 #include <stdint.h>
  20
  21 #include "platform.h"
  22
  23 #ifdef USE_VCP
  24
  25 #include "drivers/io.h"
  26 #include "drivers/time.h"
  27 #include "usb_io.h"
  28
  29 #ifdef USB_DETECT_PIN
  30 static IO_t usbDetectPin = IO_NONE;
  31 #endif
  32
  33 void usbCableDetectDeinit(void)
  34 {
  35 #ifdef USB_DETECT_PIN
  36     IOInit(usbDetectPin, OWNER_FREE, RESOURCE_NONE, 0);
  37     IOConfigGPIO(usbDetectPin, IOCFG_IN_FLOATING);
  38     usbDetectPin = IO_NONE;
  39 #endif
  40 }
  41
  42 void usbCableDetectInit(void)
  43 {
  44 #ifdef USB_DETECT_PIN
  45     usbDetectPin = IOGetByTag(IO_TAG(USB_DETECT_PIN));
  46
  47     IOInit(usbDetectPin, OWNER_USB, RESOURCE_INPUT, 0);
  48     IOConfigGPIO(usbDetectPin, IOCFG_OUT_PP);
  49 #endif
  50 }
  51
  52 bool usbCableIsInserted(void)
  53 {
  54     bool result = false;
  55
  56 #ifdef USB_DETECT_PIN
  57     result = IORead(usbDetectPin) != 0;
  58 #endif
  59
  60     return result;
  61 }
  62
  63 void usbGenerateDisconnectPulse(void)
  64 {
  65     /* Pull down PA12 to create USB disconnect pulse */
  66     IO_t usbPin = IOGetByTag(IO_TAG(PA12));
  67     IOConfigGPIO(usbPin, IOCFG_OUT_OD);
  68
  69     IOLo(usbPin);
  70
  71     delay(200);
  72
  73     IOHi(usbPin);
  74 }
  75
  76 #endif