src/main/drivers/serial_usb_vcp.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 <stdint.h>
  19 #include <stdlib.h>
  20 #include <stdbool.h>
  21 #include <string.h>
  22
  23 #include "platform.h"
  24
  25 #include "build_config.h"
  26
  27 #include "usb_core.h"
  28 #include "usb_init.h"
  29 #include "hw_config.h"
  30
  31 #include "drivers/system.h"
  32
  33 #include "serial.h"
  34 #include "serial_usb_vcp.h"
  35
  36
  37 #define USB_TIMEOUT  50
  38
  39 static vcpPort_t vcpPort;
  40
  41 void usbVcpSetBaudRate(serialPort_t *instance, uint32_t baudRate)
  42 {
  43     UNUSED(instance);
  44     UNUSED(baudRate);
  45
  46     // TODO implement
  47 }
  48
  49 void usbVcpSetMode(serialPort_t *instance, portMode_t mode)
  50 {
  51     UNUSED(instance);
  52     UNUSED(mode);
  53
  54     // TODO implement
  55 }
  56
  57 bool isUsbVcpTransmitBufferEmpty(serialPort_t *instance)
  58 {
  59     UNUSED(instance);
  60     return true;
  61 }
  62
  63 uint8_t usbVcpAvailable(serialPort_t *instance)
  64 {
  65     UNUSED(instance);
  66
  67     return receiveLength & 0xFF; // FIXME use uint32_t return type everywhere
  68 }
  69
  70 uint8_t usbVcpRead(serialPort_t *instance)
  71 {
  72     UNUSED(instance);
  73
  74     uint8_t buf[1];
  75
  76     uint32_t rxed = 0;
  77
  78     while (rxed < 1) {
  79         rxed += CDC_Receive_DATA((uint8_t*)buf + rxed, 1 - rxed);
  80     }
  81
  82     return buf[0];
  83 }
  84
  85 void usbVcpWrite(serialPort_t *instance, uint8_t c)
  86 {
  87     UNUSED(instance);
  88
  89     uint32_t txed;
  90     uint32_t start = millis();
  91
  92     if (!(usbIsConnected() && usbIsConfigured())) {
  93         return;
  94     }
  95
  96     do {
  97         txed = CDC_Send_DATA((uint8_t*)&c, 1);
  98     } while (txed < 1 && (millis() - start < USB_TIMEOUT));
  99
 100 }
 101
 102 const struct serialPortVTable usbVTable[] = { { usbVcpWrite, usbVcpAvailable, usbVcpRead, usbVcpSetBaudRate, isUsbVcpTransmitBufferEmpty, usbVcpSetMode } };
 103
 104 serialPort_t *usbVcpOpen(void)
 105 {
 106     vcpPort_t *s;
 107
 108     Set_System();
 109     Set_USBClock();
 110     USB_Interrupts_Config();
 111     USB_Init();
 112
 113     s = &vcpPort;
 114     s->port.vTable = usbVTable;
 115
 116     return (serialPort_t *)s;
 117 }