root / arduino-1.0 / hardware / arduino / cores / arduino / CDC.cpp @ 58d82c77
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/* Copyright (c) 2011, Peter Barrett
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**
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** Permission to use, copy, modify, and/or distribute this software for
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** any purpose with or without fee is hereby granted, provided that the
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** above copyright notice and this permission notice appear in all copies.
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**
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** THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
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** WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
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** WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR
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** BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES
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** OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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** WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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** ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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** SOFTWARE.
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*/
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#include "Platform.h" |
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#include "USBAPI.h" |
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#include <avr/wdt.h> |
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#if defined(USBCON)
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#ifdef CDC_ENABLED
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void Reboot()
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{ |
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USB.detach(); |
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cli(); |
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asm volatile("jmp 0x7800"); // jump to bootloader - DiskLoader takes up last 2 kB |
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} |
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typedef struct |
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{ |
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u32 dwDTERate; |
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u8 bCharFormat; |
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u8 bParityType; |
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u8 bDataBits; |
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u8 lineState; |
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} LineInfo; |
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static volatile LineInfo _usbLineInfo = { 57600, 0x00, 0x00, 0x00, 0x00 }; |
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#define WEAK __attribute__ ((weak))
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extern const CDCDescriptor _cdcInterface PROGMEM; |
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const CDCDescriptor _cdcInterface =
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{ |
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D_IAD(0,2,CDC_COMMUNICATION_INTERFACE_CLASS,CDC_ABSTRACT_CONTROL_MODEL,1), |
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// CDC communication interface
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D_INTERFACE(CDC_ACM_INTERFACE,1,CDC_COMMUNICATION_INTERFACE_CLASS,CDC_ABSTRACT_CONTROL_MODEL,0), |
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D_CDCCS(CDC_HEADER,0x10,0x01), // Header (1.10 bcd) |
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D_CDCCS(CDC_CALL_MANAGEMENT,1,1), // Device handles call management (not) |
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D_CDCCS4(CDC_ABSTRACT_CONTROL_MANAGEMENT,6), // SET_LINE_CODING, GET_LINE_CODING, SET_CONTROL_LINE_STATE supported |
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D_CDCCS(CDC_UNION,CDC_ACM_INTERFACE,CDC_DATA_INTERFACE), // Communication interface is master, data interface is slave 0
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D_ENDPOINT(USB_ENDPOINT_IN (CDC_ENDPOINT_ACM),USB_ENDPOINT_TYPE_INTERRUPT,0x10,0x40), |
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// CDC data interface
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D_INTERFACE(CDC_DATA_INTERFACE,2,CDC_DATA_INTERFACE_CLASS,0,0), |
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D_ENDPOINT(USB_ENDPOINT_OUT(CDC_ENDPOINT_OUT),USB_ENDPOINT_TYPE_BULK,0x40,0), |
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D_ENDPOINT(USB_ENDPOINT_IN (CDC_ENDPOINT_IN ),USB_ENDPOINT_TYPE_BULK,0x40,0) |
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}; |
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int WEAK CDC_GetInterface(u8* interfaceNum)
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{ |
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interfaceNum[0] += 2; // uses 2 |
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return USB_SendControl(TRANSFER_PGM,&_cdcInterface,sizeof(_cdcInterface)); |
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} |
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bool WEAK CDC_Setup(Setup& setup)
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{ |
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u8 r = setup.bRequest; |
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u8 requestType = setup.bmRequestType; |
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if (REQUEST_DEVICETOHOST_CLASS_INTERFACE == requestType)
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{ |
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if (CDC_GET_LINE_CODING == r)
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{ |
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USB_SendControl(0,(void*)&_usbLineInfo,7); |
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return true; |
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} |
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} |
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if (REQUEST_HOSTTODEVICE_CLASS_INTERFACE == requestType)
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{ |
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if (CDC_SET_LINE_CODING == r)
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{ |
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USB_RecvControl((void*)&_usbLineInfo,7); |
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return true; |
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} |
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if (CDC_SET_CONTROL_LINE_STATE == r)
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{ |
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if (0 != _usbLineInfo.lineState && 1200 == _usbLineInfo.dwDTERate) // auto-reset is triggered when the port, already open at 1200 bps, is closed |
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Reboot(); |
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_usbLineInfo.lineState = setup.wValueL; |
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return true; |
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} |
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} |
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return false; |
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} |
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int _serialPeek = -1; |
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void Serial_::begin(uint16_t baud_count)
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{ |
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} |
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void Serial_::end(void) |
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{ |
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} |
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int Serial_::available(void) |
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{ |
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u8 avail = USB_Available(CDC_RX); |
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if (_serialPeek != -1) |
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avail++; |
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return avail;
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} |
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// peek is nasty
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int Serial_::peek(void) |
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{ |
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if (_serialPeek == -1) |
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_serialPeek = read(); |
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return _serialPeek;
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} |
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int Serial_::read(void) |
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{ |
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int c;
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if (_serialPeek != -1) |
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{ |
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c = _serialPeek; |
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_serialPeek = -1;
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} else {
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c = USB_Recv(CDC_RX); |
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} |
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return c;
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} |
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void Serial_::flush(void) |
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{ |
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USB_Flush(CDC_TX); |
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} |
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size_t Serial_::write(uint8_t c) |
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{ |
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/* only try to send bytes if the high-level CDC connection itself
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is open (not just the pipe) - the OS should set lineState when the port
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is opened and clear lineState when the port is closed.
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bytes sent before the user opens the connection or after
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the connection is closed are lost - just like with a UART. */
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// TODO - ZE - check behavior on different OSes and test what happens if an
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// open connection isn't broken cleanly (cable is yanked out, host dies
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// or locks up, or host virtual serial port hangs)
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if (_usbLineInfo.lineState > 0) { |
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int r = USB_Send(CDC_TX,&c,1); |
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if (r > 0) { |
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return r;
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} else {
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setWriteError(); |
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return 0; |
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} |
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} |
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setWriteError(); |
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return 0; |
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} |
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Serial_ Serial; |
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#endif
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#endif /* if defined(USBCON) */ |