src/main/drivers/usb_io.c

   1 /*
   2  * This file is part of Cleanflight and Betaflight.
   3  *
   4  * Cleanflight and Betaflight are free software. You can redistribute
   5  * this software and/or modify this software under the terms of the
   6  * GNU General Public License as published by the Free Software
   7  * Foundation, either version 3 of the License, or (at your option)
   8  * any later version.
   9  *
  10  * Cleanflight and Betaflight are distributed in the hope that they
  11  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
  12  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  13  * See the GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this software.
  17  *
  18  * If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <stdbool.h>
  22 #include <stdint.h>
  23
  24 #include "platform.h"
  25
  26 #ifdef USE_VCP
  27
  28 #include "drivers/io.h"
  29 #include "drivers/time.h"
  30 #include "usb_io.h"
  31
  32 #ifdef USE_USB_DETECT
  33 static IO_t usbDetectPin;
  34 #endif
  35
  36 void usbCableDetectDeinit(void)
  37 {
  38 #ifdef USE_USB_DETECT
  39     IOInit(usbDetectPin, OWNER_FREE, 0);
  40     IOConfigGPIO(usbDetectPin, IOCFG_IN_FLOATING);
  41     usbDetectPin = IO_NONE;
  42 #endif
  43 }
  44
  45 void usbCableDetectInit(void)
  46 {
  47 #ifdef USE_USB_DETECT
  48     usbDetectPin = IOGetByTag(IO_TAG(USB_DETECT_PIN));
  49
  50     IOInit(usbDetectPin, OWNER_USB_DETECT, 0);
  51     IOConfigGPIO(usbDetectPin, IOCFG_IPD);
  52 #endif
  53 }
  54
  55 bool usbCableIsInserted(void)
  56 {
  57     bool result = false;
  58
  59 #ifdef USE_USB_DETECT
  60     if (usbDetectPin) {
  61         result = IORead(usbDetectPin) != 0;
  62     }
  63 #endif
  64
  65     return result;
  66 }
  67
  68 void usbGenerateDisconnectPulse(void)
  69 {
  70     /* Pull down PA12 to create USB disconnect pulse */
  71     IO_t usbPin = IOGetByTag(IO_TAG(PA12));
  72     IOConfigGPIO(usbPin, IOCFG_OUT_OD);
  73
  74     IOLo(usbPin);
  75
  76     delay(200);
  77
  78     IOHi(usbPin);
  79 }
  80 #endif