USBSerial.cpp

00001 /* Copyright (c) 2010-2011 mbed.org, MIT License
00002 *
00003 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
00004 * and associated documentation files (the "Software"), to deal in the Software without
00005 * restriction, including without limitation the rights to use, copy, modify, merge, publish,
00006 * distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
00007 * Software is furnished to do so, subject to the following conditions:
00008 *
00009 * The above copyright notice and this permission notice shall be included in all copies or
00010 * substantial portions of the Software.
00011 *
00012 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
00013 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
00014 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
00015 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00016 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00017 */
00018 
00019 #include "stdint.h"
00020 #include "USBSerial.h"
00021 
00022 int USBSerial::_putc(int c) {
00023     if (!terminal_connected)
00024         return 0;
00025     send((uint8_t *)&c, 1);
00026     return 1;
00027 }
00028 
00029 int USBSerial::_getc() {
00030     uint8_t c = 0;
00031     while (buf.isEmpty());
00032     buf.dequeue(&c);
00033     return c;
00034 }
00035 
00036 int USBSerial::_read(void* buffer, int length)
00037 {
00038     int data_read = 0;
00039 
00040     uint8_t *ptr = static_cast<uint8_t *>(buffer);
00041 
00042     if (length == 0) {
00043         return 0;
00044     }
00045 
00046     if (buf.isEmpty()) {
00047         return -EAGAIN;
00048     }
00049 
00050     while (data_read < length && !buf.isEmpty()) {
00051         buf.dequeue(ptr++);
00052         data_read++;
00053     }
00054 
00055     return data_read;
00056 }
00057 
00058 int USBSerial::_write(uint8_t * buf, uint16_t size) {
00059     uint16_t sent = size;
00060     
00061     // This handles the case where we have more to send than one bulk frame
00062     while(size > MAX_PACKET_SIZE_EPBULK && send(buf, MAX_PACKET_SIZE_EPBULK)) {
00063         size -= MAX_PACKET_SIZE_EPBULK;
00064     }
00065     if(!send(buf, size)) {
00066         return -EAGAIN;
00067     }
00068     return sent;
00069 }
00070 
00071 bool USBSerial::writeBlock(uint8_t * buf, uint16_t size) {
00072     if(size > MAX_PACKET_SIZE_EPBULK) {
00073         return false;
00074     }
00075     if(!send(buf, size)) {
00076         return false;
00077     }
00078     return true;
00079 }
00080 
00081 
00082 
00083 bool USBSerial::EPBULK_OUT_callback() {
00084     uint8_t c[65];
00085     uint32_t size = 0;
00086 
00087     //we read the packet received and put it on the circular buffer
00088     readEP(c, &size);
00089     for (uint32_t i = 0; i < size; i++) {
00090         buf.queue(c[i]);
00091     }
00092 
00093     //call a potential handlenr
00094     if (rx)
00095         rx.call();
00096 
00097     return true;
00098 }
00099 
00100 uint8_t USBSerial::available() {
00101     return buf.available();
00102 }
00103 
00104 bool USBSerial::connected() {
00105     return terminal_connected;
00106 }