Autoreset 1200 bps fix.
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0138ee9b01
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@ -101,13 +101,26 @@ bool WEAK CDC_Setup(Setup& setup)
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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 (0 != _usbLineInfo.lineState && 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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// Serial1.print(">"); Serial1.println(_usbLineInfo.lineState, HEX);
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if ((_usbLineInfo.lineState & 0x01) == 0 && _usbLineInfo.dwDTERate == 1200) {
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*(uint16_t *)0x0A00 = 0x7777;
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wdt_enable(WDTO_250MS);
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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 *)0x0A00 = 0x0;
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}
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return true;
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}
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@ -202,4 +215,4 @@ size_t Serial_::write(uint8_t c)
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Serial_ Serial;
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#endif
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#endif /* if defined(USBCON) */
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#endif /* if defined(USBCON) */
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