{"action":"created","issue":{"url":"https://api.github.com/repos/micropython/micropython/issues/1147","labels_url":"https://api.github.com/repos/micropython/micropython/issues/1147/labels{/name}","comments_url":"https://api.github.com/repos/micropython/micropython/issues/1147/comments","events_url":"https://api.github.com/repos/micropython/micropython/issues/1147/events","html_url":"https://github.com/micropython/micropython/issues/1147","id":60087863,"number":1147,"title":"STMF4DISC ceased working after 534574348e477005b8647e45402d859a0f3db6ca commit","user":{"login":"siorpaes","id":1059507,"avatar_url":"https://avatars.githubusercontent.com/u/1059507?v=3","gravatar_id":"","url":"https://api.github.com/users/siorpaes","html_url":"https://github.com/siorpaes","followers_url":"https://api.github.com/users/siorpaes/followers","following_url":"https://api.github.com/users/siorpaes/following{/other_user}","gists_url":"https://api.github.com/users/siorpaes/gists{/gist_id}","starred_url":"https://api.github.com/users/siorpaes/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/siorpaes/subscriptions","organizations_url":"https://api.github.com/users/siorpaes/orgs","repos_url":"https://api.github.com/users/siorpaes/repos","events_url":"https://api.github.com/users/siorpaes/events{/privacy}","received_events_url":"https://api.github.com/users/siorpaes/received_events","type":"User","site_admin":false},"labels":[],"state":"closed","locked":false,"assignee":null,"milestone":null,"comments":19,"created_at":"2015-03-06T11:02:01Z","updated_at":"2015-03-12T13:47:58Z","closed_at":"2015-03-07T11:35:02Z","body":"Hello,\r\n\r\nI updated to latest available commit yesterday but unfortunately STM32F4-Discovery port stopped working: no CDC nor Mass Storage Device appeared over USB. I double checked with 'lsusb' with Linux but no VID/CID pop up. If I reset the board with no USB cable inserted, the green LED (LD4) switches on and after 7 seconds all other LEDs start blinking twice in circles and finally end up in being all on. If I reset the board with the USB cable connected, green LED stays on and all other LEDs stay off.\r\n\r\nSo, I gradually rolled back to previous versions and sorted out that this effect is happening from 534574348e477005b8647e45402d859a0f3db6ca version onward. Differences with previous version 11aa6ba456287d6c80598a7ebbebd2887ce8f5a2 are not giving me any hint to me as they appear to have nothing specific to STM32F4DISC port.\r\nDo you have any suggestion on where the issue could be ?\r\n\r\nFor a rapid test, firmware images associated to the two hashes are available here:\r\nhttps://www.dropbox.com/s/ue9txaz36ou5w0q/STM32F4-Discovery.zip?dl=0\r\n\r\nMany thanks in advance,\r\n\r\nDavid\r\n"},"comment":{"url":"https://api.github.com/repos/micropython/micropython/issues/comments/78482104","html_url":"https://github.com/micropython/micropython/issues/1147#issuecomment-78482104","issue_url":"https://api.github.com/repos/micropython/micropython/issues/1147","id":78482104,"user":{"login":"siorpaes","id":1059507,"avatar_url":"https://avatars.githubusercontent.com/u/1059507?v=3","gravatar_id":"","url":"https://api.github.com/users/siorpaes","html_url":"https://github.com/siorpaes","followers_url":"https://api.github.com/users/siorpaes/followers","following_url":"https://api.github.com/users/siorpaes/following{/other_user}","gists_url":"https://api.github.com/users/siorpaes/gists{/gist_id}","starred_url":"https://api.github.com/users/siorpaes/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/siorpaes/subscriptions","organizations_url":"https://api.github.com/users/siorpaes/orgs","repos_url":"https://api.github.com/users/siorpaes/repos","events_url":"https://api.github.com/users/siorpaes/events{/privacy}","received_events_url":"https://api.github.com/users/siorpaes/received_events","type":"User","site_admin":false},"created_at":"2015-03-12T13:47:58Z","updated_at":"2015-03-12T13:47:58Z","body":"Problem vanishes also increasing flash Wait States as suggested in above link (FLASH_LATENCY_6 is enough).\r\nGuess I can end here my debugging sessions :)"}}