mirror of
https://github.com/arduino/Arduino.git
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240 lines
6.7 KiB
C++
240 lines
6.7 KiB
C++
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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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#if (RAMEND < 1000)
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#define SERIAL_BUFFER_SIZE 16
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#else
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#define SERIAL_BUFFER_SIZE 64
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#endif
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struct ring_buffer
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{
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unsigned char buffer[SERIAL_BUFFER_SIZE];
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volatile int head;
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volatile int tail;
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};
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ring_buffer cdc_rx_buffer = { { 0 }, 0, 0};
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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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_usbLineInfo.lineState = setup.wValueL;
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// auto-reset into the bootloader is triggered when the port, already
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// open at 1200 bps, is closed. this is the signal to start the watchdog
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// with a relatively long period so it can finish housekeeping tasks
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// like servicing endpoints before the sketch ends
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if (1200 == _usbLineInfo.dwDTERate) {
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// We check DTR state to determine if host port is open (bit 0 of lineState).
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if ((_usbLineInfo.lineState & 0x01) == 0) {
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*(uint16_t *)0x0800 = 0x7777;
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wdt_enable(WDTO_120MS);
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} else {
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// Most OSs do some intermediate steps when configuring ports and DTR can
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// twiggle more than once before stabilizing.
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// To avoid spurious resets we set the watchdog to 250ms and eventually
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// cancel if DTR goes back high.
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wdt_disable();
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wdt_reset();
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*(uint16_t *)0x0800 = 0x0;
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}
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}
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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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void Serial_::accept(void)
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{
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ring_buffer *buffer = &cdc_rx_buffer;
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int i = (unsigned int)(buffer->head+1) % SERIAL_BUFFER_SIZE;
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// if we should be storing the received character into the location
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// just before the tail (meaning that the head would advance to the
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// current location of the tail), we're about to overflow the buffer
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// and so we don't write the character or advance the head.
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// while we have room to store a byte
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while (i != buffer->tail) {
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int c = USB_Recv(CDC_RX);
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if (c == -1)
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break; // no more data
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buffer->buffer[buffer->head] = c;
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buffer->head = i;
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i = (unsigned int)(buffer->head+1) % SERIAL_BUFFER_SIZE;
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}
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}
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int Serial_::available(void)
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{
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ring_buffer *buffer = &cdc_rx_buffer;
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return (unsigned int)(SERIAL_BUFFER_SIZE + buffer->head - buffer->tail) % SERIAL_BUFFER_SIZE;
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}
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int Serial_::peek(void)
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{
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ring_buffer *buffer = &cdc_rx_buffer;
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if (buffer->head == buffer->tail) {
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return -1;
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} else {
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return buffer->buffer[buffer->tail];
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}
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}
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int Serial_::read(void)
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{
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ring_buffer *buffer = &cdc_rx_buffer;
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// if the head isn't ahead of the tail, we don't have any characters
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if (buffer->head == buffer->tail) {
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return -1;
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} else {
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unsigned char c = buffer->buffer[buffer->tail];
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buffer->tail = (unsigned int)(buffer->tail + 1) % SERIAL_BUFFER_SIZE;
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return c;
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}
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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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// This operator is a convenient way for a sketch to check whether the
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// port has actually been configured and opened by the host (as opposed
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// to just being connected to the host). It can be used, for example, in
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// setup() before printing to ensure that an application on the host is
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// actually ready to receive and display the data.
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// We add a short delay before returning to fix a bug observed by Federico
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// where the port is configured (lineState != 0) but not quite opened.
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Serial_::operator bool() {
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bool result = false;
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if (_usbLineInfo.lineState > 0)
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result = true;
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delay(10);
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return result;
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}
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Serial_ Serial;
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#endif
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#endif /* if defined(USBCON) */
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