{"action":"created","issue":{"url":"https://api.github.com/repos/Traumflug/Teacup_Firmware/issues/248","repository_url":"https://api.github.com/repos/Traumflug/Teacup_Firmware","labels_url":"https://api.github.com/repos/Traumflug/Teacup_Firmware/issues/248/labels{/name}","comments_url":"https://api.github.com/repos/Traumflug/Teacup_Firmware/issues/248/comments","events_url":"https://api.github.com/repos/Traumflug/Teacup_Firmware/issues/248/events","html_url":"https://github.com/Traumflug/Teacup_Firmware/issues/248","id":188998283,"number":248,"title":"overflow in dda","user":{"login":"Wurstnase","id":8709415,"avatar_url":"https://avatars.githubusercontent.com/u/8709415?v=3","gravatar_id":"","url":"https://api.github.com/users/Wurstnase","html_url":"https://github.com/Wurstnase","followers_url":"https://api.github.com/users/Wurstnase/followers","following_url":"https://api.github.com/users/Wurstnase/following{/other_user}","gists_url":"https://api.github.com/users/Wurstnase/gists{/gist_id}","starred_url":"https://api.github.com/users/Wurstnase/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/Wurstnase/subscriptions","organizations_url":"https://api.github.com/users/Wurstnase/orgs","repos_url":"https://api.github.com/users/Wurstnase/repos","events_url":"https://api.github.com/users/Wurstnase/events{/privacy}","received_events_url":"https://api.github.com/users/Wurstnase/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":9,"created_at":"2016-11-13T22:02:04Z","updated_at":"2016-11-15T13:00:37Z","closed_at":null,"body":"Hi,\r\n\r\nI'm searching for something in dda lookahead which will overflow. This part should be dependent on steps per mm and the feedrate.\r\n\r\nMy steps per mm is 1280. At 3037 mm/min I can travel without any issue. At 3038 mm/min something will overflow. But I don't have any clue where or what. There should be some rounding in it. \r\n1280 * 3038 / 60 ~ 2^16.\r\n\r\nI replaced already muldiv and muldivQR with 64bit instructions. But no health.\r\n\r\nPS:\r\nWith 640 steps per mm the issue starts with a feedrate of 6064 mm/min."},"comment":{"url":"https://api.github.com/repos/Traumflug/Teacup_Firmware/issues/comments/260634759","html_url":"https://github.com/Traumflug/Teacup_Firmware/issues/248#issuecomment-260634759","issue_url":"https://api.github.com/repos/Traumflug/Teacup_Firmware/issues/248","id":260634759,"user":{"login":"Wurstnase","id":8709415,"avatar_url":"https://avatars.githubusercontent.com/u/8709415?v=3","gravatar_id":"","url":"https://api.github.com/users/Wurstnase","html_url":"https://github.com/Wurstnase","followers_url":"https://api.github.com/users/Wurstnase/followers","following_url":"https://api.github.com/users/Wurstnase/following{/other_user}","gists_url":"https://api.github.com/users/Wurstnase/gists{/gist_id}","starred_url":"https://api.github.com/users/Wurstnase/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/Wurstnase/subscriptions","organizations_url":"https://api.github.com/users/Wurstnase/orgs","repos_url":"https://api.github.com/users/Wurstnase/repos","events_url":"https://api.github.com/users/Wurstnase/events{/privacy}","received_events_url":"https://api.github.com/users/Wurstnase/received_events","type":"User","site_admin":false},"created_at":"2016-11-15T13:00:37Z","updated_at":"2016-11-15T13:00:37Z","body":"https://github.com/Traumflug/Teacup_Firmware/blob/master/dda_lookahead.c#L216\r\nThis line should be:\r\n```\r\nthis_F = muldiv(current->fast_um, this_F, current->distance);\r\n```"}}
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