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Log: prevent looping forever 

this happened with an empty dataflash
This commit is contained in:
Andrew Tridgell 2011-11-18 19:45:54 +11:00
parent 73e0ab0c63
commit 9ea0fc9539
1 changed files with 7 additions and 0 deletions
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7
ArduPlane/Log.pde
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@ -376,12 +376,19 @@ static int find_last_log_page(uint16_t log_number)
bottom_page_filepage = top_page_filepage;
do
{
int16_t last_bottom_page_file;
top_page = bottom_page;
bottom_page = bottom_page - bottom_page_filepage;
if(bottom_page < 1) bottom_page = 1;
DataFlash.StartRead(bottom_page);
last_bottom_page_file = bottom_page_file;
bottom_page_file = DataFlash.GetFileNumber();
bottom_page_filepage = DataFlash.GetFilePage();
if (bottom_page_file == last_bottom_page_file &&
bottom_page_filepage == 0) {
/* no progress can be made - give up. The log may be corrupt */
return -1;
}
} while (bottom_page_file != log_number && bottom_page != 1);
// Deal with stepping down too far due to overwriting a file