USBHostSerial.cpp

00001 /* mbed USBHost Library
00002  * Copyright (c) 2006-2013 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 "USBHostSerial.h"
00018 
00019 #if USBHOST_SERIAL
00020 
00021 #include "dbg.h"
00022 
00023 #define SET_LINE_CODING 0x20
00024 
00025 USBHostSerial::USBHostSerial(): circ_buf() {
00026     host = USBHost::getHostInst();
00027     size_bulk_in = 0;
00028     size_bulk_out = 0;
00029     init();
00030 }
00031 
00032 void USBHostSerial::init() {
00033     dev = NULL;
00034     bulk_in = NULL;
00035     bulk_out = NULL;
00036     dev_connected = false;
00037     serial_intf = -1;
00038     serial_device_found = false;
00039     line_coding.baudrate = 9600;
00040     line_coding.data_bits = 8;
00041     line_coding.parity = None;
00042     line_coding.stop_bits = 1;
00043     circ_buf.flush();
00044 }
00045 
00046 bool USBHostSerial::connected()
00047 {
00048     return dev_connected;
00049 }
00050 
00051 bool USBHostSerial::connect() {
00052 
00053     if (dev_connected) {
00054         return true;
00055     }
00056     for (uint8_t i = 0; i < MAX_DEVICE_CONNECTED; i++) {
00057         if ((dev = host->getDevice(i)) != NULL) {
00058             
00059             USB_DBG("Trying to connect serial device\r\n");
00060 
00061             if(host->enumerate(dev, this))
00062                 break;
00063             
00064             if (serial_device_found) {
00065                 bulk_in = dev->getEndpoint(serial_intf, BULK_ENDPOINT, IN);
00066                 bulk_out = dev->getEndpoint(serial_intf, BULK_ENDPOINT, OUT);
00067                 
00068                 if (!bulk_in || !bulk_out)
00069                     break;
00070                 
00071                 USB_INFO("New Serial device: VID:%04x PID:%04x [dev: %p - intf: %d]", dev->getVid(), dev->getPid(), dev, serial_intf);
00072                 dev->setName("Serial", serial_intf);
00073                 host->registerDriver(dev, serial_intf, this, &USBHostSerial::init);
00074                 
00075                 baud(9600);
00076                 
00077                 size_bulk_in = bulk_in->getSize();
00078                 size_bulk_out = bulk_out->getSize();
00079                 
00080                 bulk_in->attach(this, &USBHostSerial::rxHandler);
00081                 bulk_out->attach(this, &USBHostSerial::txHandler);
00082                 
00083                 host->bulkRead(dev, bulk_in, buf, size_bulk_in, false);
00084                 dev_connected = true;
00085                 return true;
00086             }
00087         }
00088     }
00089     init();
00090     return false;
00091 }
00092 
00093 void USBHostSerial::rxHandler() {
00094     if (bulk_in) {
00095         int len = bulk_in->getLengthTransferred();
00096         if (bulk_in->getState() == USB_TYPE_IDLE) {
00097             for (int i = 0; i < len; i++) {
00098                 circ_buf.queue(buf[i]);
00099             }
00100             rx.call();
00101             host->bulkRead(dev, bulk_in, buf, size_bulk_in, false);
00102         }
00103     }
00104 }
00105 
00106 void USBHostSerial::txHandler() {
00107     if (bulk_out) {
00108         if (bulk_out->getState() == USB_TYPE_IDLE) {
00109             tx.call();
00110         }
00111     }
00112 }
00113 
00114 int USBHostSerial::_putc(int c) {
00115     if (bulk_out) {
00116         if (host->bulkWrite(dev, bulk_out, (uint8_t *)&c, 1) == USB_TYPE_OK) {
00117             return 1;
00118         }
00119     }
00120     return -1;
00121 }
00122 
00123 void USBHostSerial::baud(int baudrate) {
00124     line_coding.baudrate = baudrate;
00125     format(line_coding.data_bits, (Parity)line_coding.parity, line_coding.stop_bits);
00126 }
00127 
00128 void USBHostSerial::format(int bits, Parity parity, int stop_bits) {
00129     line_coding.data_bits = bits;
00130     line_coding.parity = parity;
00131     line_coding.stop_bits = (stop_bits == 1) ? 0 : 2;
00132     
00133     // set line coding
00134     int res = host->controlWrite(   dev,
00135                                     USB_RECIPIENT_INTERFACE | USB_HOST_TO_DEVICE | USB_REQUEST_TYPE_CLASS,
00136                                     SET_LINE_CODING,
00137                                     0, serial_intf, (uint8_t *)&line_coding, 7);
00138 }
00139 
00140 int USBHostSerial::_getc() {
00141     uint8_t c = 0;
00142     if (bulk_in == NULL) {
00143         init();
00144         return -1;
00145     }
00146     while (circ_buf.isEmpty());
00147     circ_buf.dequeue(&c);
00148     return c;
00149 }
00150 
00151 
00152 uint8_t USBHostSerial::available() {
00153     return circ_buf.available();
00154 }
00155 
00156 /*virtual*/ void USBHostSerial::setVidPid(uint16_t vid, uint16_t pid)
00157 {
00158     // we don't check VID/PID for MSD driver
00159 }
00160 
00161 /*virtual*/ bool USBHostSerial::parseInterface(uint8_t intf_nb, uint8_t intf_class, uint8_t intf_subclass, uint8_t intf_protocol) //Must return true if the interface should be parsed
00162 {
00163     if ((serial_intf == -1) &&
00164         (intf_class == SERIAL_CLASS) &&
00165         (intf_subclass == 0x00) &&
00166         (intf_protocol == 0x00)) {
00167         serial_intf = intf_nb;
00168         return true;
00169     }
00170     return false;
00171 }
00172 
00173 /*virtual*/ bool USBHostSerial::useEndpoint(uint8_t intf_nb, ENDPOINT_TYPE type, ENDPOINT_DIRECTION dir) //Must return true if the endpoint will be used
00174 {
00175     if (intf_nb == serial_intf) {
00176         if (type == BULK_ENDPOINT) {
00177             serial_device_found = true;
00178             return true;
00179         }
00180     }
00181     return false;
00182 }
00183 
00184 #endif