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save RAM content overridden by bootloader magic

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and restore it in case of aborted reboot
use RAMEND-1 as suggested by @yyyc514 in PR #2474

of course it's not a real solution but we cannot force everyone to update the bootloader using an external programmer
This commit is contained in:
Martino Facchin 2015-07-01 17:00:14 +02:00 committed by Cristian Maglie
parent 5defaeaa97
commit 8a45883230
1 changed files with 2 additions and 1 deletions
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3
hardware/arduino/avr/cores/arduino/CDC.cpp
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@ -95,6 +95,7 @@ bool CDC_Setup(USBSetup& setup)
// We check DTR state to determine if host port is open (bit 0 of lineState). // We check DTR state to determine if host port is open (bit 0 of lineState).
if (1200 == _usbLineInfo.dwDTERate && (_usbLineInfo.lineState & 0x01) == 0) if (1200 == _usbLineInfo.dwDTERate && (_usbLineInfo.lineState & 0x01) == 0)
{ {
*(uint16_t *)(RAMEND-1) = *(uint16_t *)0x0800;
*(uint16_t *)0x0800 = 0x7777; *(uint16_t *)0x0800 = 0x7777;
wdt_enable(WDTO_120MS); wdt_enable(WDTO_120MS);
} }
@ -107,7 +108,7 @@ bool CDC_Setup(USBSetup& setup)
wdt_disable(); wdt_disable();
wdt_reset(); wdt_reset();
*(uint16_t *)0x0800 = 0x0; *(uint16_t *)0x0800 = *(uint16_t *)(RAMEND-1);
} }
} }
return true; return true;