Mit dieser Library k\u00f6nnen normale USB-Sticks am USB-OTG-Port vom Discovery-Modul betrieben werden. Per FATFS-Library (die USB-Version) kann dann mit Filefunktionen darauf zugegriffen werden. Die Library hat nur zwei Funktionen : 2. Die \u201cHOST_Do-Funktion\u201d Hinweis : ich hab hier zwei USB-Sticks ausprobiert. Einmal ein 8GB-Stick von SanDisk. Mit diesem kommt es aber zu einem Fehler -> \u201cDEVICE_NOT_SUPPORTED\u201d. Mit dem zweiten Stick, einem 4GB Intenso kommt kein Fehler und das schreiben und lesen funktioniert ohne Probleme.<\/p>\n Es wird ein USB-Adapter mit Micro-USB-Stecker ben\u00f6tigt. (gibts bei EBay oder Amazon)<\/p>\n Beispielbild :<\/strong><\/p>\n Benutzte Pins :<\/strong><\/p>\n Voraussetzungen :<\/strong><\/p>\n Enumerationen :<\/strong><\/p>\n Funktionen :<\/strong><\/p>\n Beispiel :<\/strong><\/p>\n Hier die Library zum\u00a0Download :<\/strong><\/p>\n ub_stm32f4_usb_msc_host_v100<\/a><\/p>\n Hier der komplette CooCox-Projektordner zum\u00a0Download :<\/strong><\/p>\n Demo_32_USB_MSC_HOST<\/a><\/p>\n
\nHinweis : es gibt noch eine Library f\u00fcr SD-Karten per FATFS (Nr. 13<\/a>) und eine kombinierte Library SD+USB (Nr. 87<\/a>)<\/p>\n
\n1. Eine \u201cInit-Funktion\u201d
\nDie muss beim start einmal aufgerufen werden.<\/p>\n
\nDiese muss zyklisch, am besten in der while(1) aufgerufen werden. Sie liefert den Status vom Memory-Stick zur\u00fcck. Dieser Status muss ausgewertet werden und erst wenn ein USB-Stick erkannt wurde, darf per FATFS darauf zugegriffen werden.<\/p>\n\n
![\"Daten](\"http:\/\/mikrocontroller.bplaced.net\/wordpress\/wp-content\/uploads\/2013\/04\/ubs_host_msc-150x150.jpg\")
<\/a><\/dt>\n\n
![\"USB-Stick](\"http:\/\/mikrocontroller.bplaced.net\/wordpress\/wp-content\/uploads\/2013\/04\/usb_msc2-150x150.jpg\")
<\/a><\/dt>\nPA9 -> USB_OTG_VBUS\nPA10 -> USB_OTG_ID\nPA11 -> USB_OTG_DM\nPA12 -> USB_OTG_DP\nPC0 -> USB_VBUS_Enable<\/pre>\n
Benutzte Module der CooCox-IDE : GPIO, MISC\nBenutzte Librarys : STM32_UB_FATFS (USB-Version)<\/pre>\n
typedef enum {\n USB_MSC_HOST_NO_INIT =0, \/\/ USB-Schnittstelle noch nicht initialisiert\n USB_MSC_DEV_DETACHED, \/\/ kein Device angeschlossen\n USB_MSC_SPEED_ERROR, \/\/ USB-Speed wird nicht unterst\u00fctzt\n USB_MSC_DEV_NOT_SUPPORTED, \/\/ Device wird nicht unters\u00fctzt\n USB_MSC_DEV_WRITE_PROTECT, \/\/ Device ist schreibgesch\u00fctzt\n USB_MSC_OVER_CURRENT, \/\/ \u00dcberstrom erkannt\n USB_MSC_DEV_CONNECTED \/\/ Device verbunden und bereit\n}USB_MSC_HOST_STATUS_t;<\/pre>\nvoid UB_USB_MSC_HOST_Init(void); \/\/ zum init des USB-Host\nUSB_MSC_HOST_STATUS_t UB_USB_MSC_HOST_Do(void); \/\/ zum check vom Device-Status<\/pre>\n
\/\/--------------------------------------------------------------\n\/\/ File : main.c\n\/\/ Datum : 13.04.2013\n\/\/ Version : 1.0\n\/\/ Autor : UB\n\/\/ EMail : mc-4u(@)t-online.de\n\/\/ Web : www.mikrocontroller-4u.de\n\/\/ CPU : STM32F4\n\/\/ IDE : CooCox CoIDE 1.7.0\n\/\/ Module : CMSIS_BOOT, M4_CMSIS_CORE\n\/\/ Funktion : Demo der USB-MSC-HOST-Library\n\/\/ Hinweis : Diese zwei Files muessen auf 8MHz stehen\n\/\/ \"cmsis_boot\/stm32f4xx.h\"\n\/\/ \"cmsis_boot\/system_stm32f4xx.c\"\n\/\/--------------------------------------------------------------\n\n#include \"main.h\"\n#include \"stm32_ub_led.h\"\n#include \"stm32_ub_usb_msc_host.h\"\n\nint main(void)\n{\n FIL myFile; \/\/ Filehandler\n uint8_t write_ok=0;\n\n SystemInit(); \/\/ Quarz Einstellungen aktivieren\n\n \/\/ Init der LEDs\n UB_Led_Init();\n\n \/\/ Init vom USB-OTG-Port als MSC-HOST\n \/\/ (zum lesen\/schreiben auf einen USB-Stick)\n UB_USB_MSC_HOST_Init();\n\n while(1)\n {\n \/\/ pollen vom USB-Status\n if(UB_USB_MSC_HOST_Do()==USB_MSC_DEV_CONNECTED) {\n \/\/ wenn USB-Stick erkannt wurde\n UB_Led_On(LED_GREEN);\n\n \/\/ wenn File noch nicht geschrieben wurde\n if(write_ok==0) {\n \twrite_ok=1;\n \tUB_Led_On(LED_RED);\n \t\/\/ Media mounten\n \tif(UB_Fatfs_Mount(USB_0)==FATFS_OK) {\n \/\/ File zum schreiben im root neu anlegen\n if(UB_Fatfs_OpenFile(&myFile, \"USB_File.txt\", F_WR_CLEAR)==FATFS_OK) {\n \/\/ ein paar Textzeilen in das File schreiben\n UB_Fatfs_WriteString(&myFile,\"Test der WriteString-Funktion\");\n UB_Fatfs_WriteString(&myFile,\"hier Zeile zwei\");\n UB_Fatfs_WriteString(&myFile,\"ENDE\");\n \/\/ File schliessen\n UB_Fatfs_CloseFile(&myFile);\n }\n \/\/ Media unmounten\n UB_Fatfs_UnMount(USB_0);\n }\n UB_Led_Off(LED_RED);\n }\n }\n else {\n \/\/ wenn kein USB-Stick vorhanden\n UB_Led_Off(LED_GREEN);\n }\n }\n}\n<\/pre>\n36 Antworten auf 32-USB_MSC_HOST-Library (STM32F4)<\/em><\/h3>\n
<\/p>\n
<\/p>\n
Hey, der USB stick wird von mir soweit erkannt, das heisst es m\u00fcsste auch alles korrekt initialisiert sein\u2026jedoch bricht bricht mir der usb process immer bei der USBH_HandleEnum ab und weiss einfach nicht warum evtl kannst du mir weiterhelfen.<\/p>\n<\/div>\n<\/div>\n
<\/p>\n
\n- \n
\n![\"\"](\"http:\/\/0.gravatar.com\/avatar\/67426419ead44d5afa132e92685bb460?s=40&d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
admin_ub<\/cite> sagt:<\/span><\/div>\n10. Dezember 2013 um 19:53<\/div>\n\n- \n
\n![\"\"](\"http:\/\/0.gravatar.com\/avatar\/e31a0c639ff49c8cf6a6ffb1bf6a0975?s=40&d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
Daniel<\/cite> sagt:<\/span><\/div>\n1. Februar 2014 um 12:35<\/div>\n\n
<\/p>\n
<\/p>\n
wie ich geschrieben habe, hab ich auch einen Stick der nicht funktioniert. Ich vermute der Code ist nicht ganz Fehlerfrei\u2026aber ich suche da keine Fehler. Versuchs mal mit einem anderen Stick oder im Netz nach einer anderen implementation.<\/p>\n<\/div>\n<\/div>\n
<\/li>\n<\/ul>\n<\/li>\n
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<\/p>\n
Hallo, bei mir funktioniert alles einwandfrei und der USB- Stick wird sofort erkannt. Allerdings frage ich mich, wie es m\u00f6glich ist, dass man auf Dateien zugreifen kann, ohne ihren genauen Namen zu wissen. Ich m\u00f6chte zum Beispiel die erste Datei, die auf dem Stick vorhanden ist \u00f6ffnen, um daraus zum Beispiel einen mp3- Player zu realisieren. Ich bin noch ziemlicher Anf\u00e4nger auf dem Gebiet, also w\u00e4re es super wenn mir jemand helfen k\u00f6nnte!<\/p>\n<\/div>\n<\/div>\n
<\/p>\n
\n- \n
\n![\"\"](\"http:\/\/0.gravatar.com\/avatar\/67426419ead44d5afa132e92685bb460?s=40&d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
admin_ub<\/cite> sagt:<\/span><\/div>\n1. Februar 2014 um 14:19<\/div>\n\n- \n
\n![\"\"](\"http:\/\/0.gravatar.com\/avatar\/e31a0c639ff49c8cf6a6ffb1bf6a0975?s=40&d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
Daniel<\/cite> sagt:<\/span><\/div>\n1. Februar 2014 um 17:49<\/div>\n\n- \n
\n![\"\"](\"http:\/\/0.gravatar.com\/avatar\/6945d1237f7e6e5b3049f55eab97f30d?s=40&d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
Thierry<\/cite> sagt:<\/span><\/div>\n16. Mai 2014 um 11:04<\/div>\n\n- \n
\n![\"\"](\"http:\/\/1.gravatar.com\/avatar\/133677fa0a9a2e8d01713011199e0c1c?s=40&d=http%3A%2F%2F1.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
Sven<\/cite> sagt:<\/span><\/div>\n5. August 2014 um 16:30<\/div>\n\n
<\/p>\n
<\/p>\n
ich hab schon einen MP3-Player realisiert : Show-Prj-03. Da kannst du auch nachlesen wie man per \u201cf_readdir()\u201d ein Direktory-Eintrag auslie\u00dft. Oder lie\u00df in der Doku von ChaN nach, da stehen auch Beispiele drinn.<\/p>\n<\/div>\n<\/div>\n
<\/li>\n<\/ul>\n<\/li>\n
<\/p>\n
<\/p>\n
Dieses Projekt hatte ich leider noch nicht gesehn. Es wird mir sicher sehr weiterhelfen. Danke!<\/p>\n<\/div>\n<\/div>\n
<\/li>\n
<\/p>\n
<\/p>\n
Hello,
\nVery good code, i tried it with a OBD2 USB device.
\nBig thanks.
\nI will come back in few days to write report.<\/p>\n<\/div>\n<\/div>\n
<\/li>\n
<\/p>\n
<\/p>\n
Hi,
\nich wollte mal nachfragen, was alles beim zusammenf\u00fchren von USB und SDIO zu tun ist?
\nOder hast du es evtl. schon gemacht und nur vergessen upzudaten?
\n\u00dcber Hilfe w\u00fcrde ich mich freuen.<\/p>\n<\/div>\n<\/div>\n
<\/p>\n
\n- \n
\n![\"\"](\"http:\/\/0.gravatar.com\/avatar\/67426419ead44d5afa132e92685bb460?s=40&d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
admin_ub<\/cite> sagt:<\/span><\/div>\n17. August 2014 um 11:14<\/div>\n\n- \n
\n![\"\"](\"http:\/\/0.gravatar.com\/avatar\/e7a291f64b1224fa4f7f6d6896a15d6a?s=40&d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
Emsila<\/cite> sagt:<\/span><\/div>\n17. November 2014 um 14:35<\/div>\n\n
<\/p>\n
<\/p>\n
ich habe den Kombinierten-Mode jetzt fertig : siehe Dual_FATFS-Library (Nr. 87)<\/p>\n<\/div>\n<\/div>\n
<\/li>\n<\/ul>\n<\/li>\n
<\/p>\n
<\/p>\n
Hello.
\nI want use USB_CDC and USB_MSC in one program. When press user taster, usb mode change state. How to use usb_cdc and usb_msc at same time?
\nBest regards,
\nEI<\/p>\n<\/div>\n<\/div>\n
<\/p>\n
\n- \n
\n![\"\"](\"http:\/\/0.gravatar.com\/avatar\/67426419ead44d5afa132e92685bb460?s=40&d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
admin_ub<\/cite> sagt:<\/span><\/div>\n17. November 2014 um 19:35<\/div>\n\n
<\/p>\n
<\/p>\n
you need functions to deinit USB_CDC and USB_MSC.
\n1. USB_MSC deinit
\n2. USB_CDC init
\n3. Button
\n4. USC_CDC deinit
\n5. USB_MSC init
\n6. Button
\n7. GOTO 1<\/p>\n<\/div>\n<\/div>\n
<\/p>\n
\n- \n
\n![\"\"](\"http:\/\/0.gravatar.com\/avatar\/e7a291f64b1224fa4f7f6d6896a15d6a?s=40&d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
Emsila<\/cite> sagt:<\/span><\/div>\n24. November 2014 um 15:01<\/div>\n\n- \n
\n![\"\"](\"http:\/\/0.gravatar.com\/avatar\/e7a291f64b1224fa4f7f6d6896a15d6a?s=40&d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
Emsila<\/cite> sagt:<\/span><\/div>\n24. November 2014 um 15:16<\/div>\n\n
<\/p>\n
<\/p>\n
OK. Problem is in identical name definition in MSC and CDC header files for functions. usb_bsp.c, usb_core.c. This is not possible a compiling.<\/p>\n<\/div>\n<\/div>\n
<\/li>\n
<\/p>\n
<\/p>\n
Can you post a project with two modes when blue button (user button on discovery) changes state (cdc or msc) ?
\nThanks.<\/p>\n<\/div>\n<\/div>\n
<\/p>\n
\n- \n
\n![\"\"](\"http:\/\/0.gravatar.com\/avatar\/67426419ead44d5afa132e92685bb460?s=40&d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
admin_ub<\/cite> sagt:<\/span><\/div>\n27. November 2014 um 20:19<\/div>\n\n- \n
\n![\"\"](\"http:\/\/0.gravatar.com\/avatar\/4cb51f675049481d9c5896d0394c7dab?s=40&d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
Christian<\/cite> sagt:<\/span><\/div>\n21. August 2015 um 11:16<\/div>\n\n
<\/p>\n
<\/p>\n
thats very time-consuming\u2026you must do this on your own.<\/p>\n<\/div>\n<\/div>\n
<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n
<\/p>\n
<\/p>\n
Hallo,<\/p>\n
bei mir erkennt das Programm meinen USB Stick nicht. Was kann es da haben? Die gr\u00fcne LED leuchtet.<\/p>\n
Danke<\/p>\n
bg Christian<\/p>\n<\/div>\n<\/div>\n
<\/p>\n
\n- \n
\n![\"\"](\"http:\/\/0.gravatar.com\/avatar\/67426419ead44d5afa132e92685bb460?s=40&d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
admin_ub<\/cite> sagt:<\/span><\/div>\n23. August 2015 um 09:46<\/div>\n\n- \n
\n![\"\"](\"http:\/\/1.gravatar.com\/avatar\/d2d593f3879b1d170cd47057fe3e36d6?s=40&d=http%3A%2F%2F1.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
Gary<\/cite> sagt:<\/span><\/div>\n4. November 2015 um 07:57<\/div>\n\n
<\/p>\n
<\/p>\n
k.A.<\/p>\n<\/div>\n<\/div>\n
<\/li>\n<\/ul>\n<\/li>\n
<\/p>\n
<\/p>\n
Hi,
\nI used Google translate in my post and maybe it\u2019s not so good, so I will write this one in english. Sorry for 2 posts!<\/p>\n
By the way, thanks for writing and sharing your code, it makes it easier to help things started.<\/p>\n
I have tested your code in my target application with the needed changes and it works OK! This was using your project in Coocox.
\nHowever, I am using Atollic, and as you know, it\u2019s quite similar to Coocox. I added the directory \u201cub_lib\u201d to my project, and then your test code in my \u201cmain.c\u201d file. However, it doesn\u2019t seem to work. It always returns \u201cUSB_MSC_DEV_DETACHED\u201d.<\/p>\n
Why would this work good in Coocox, but not in Atollic? Can you think of anything?<\/p>\n
Gary<\/p>\n<\/div>\n<\/div>\n
<\/p>\n
\n- \n
\n![\"\"](\"http:\/\/0.gravatar.com\/avatar\/67426419ead44d5afa132e92685bb460?s=40&d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
admin_ub<\/cite> sagt:<\/span><\/div>\n6. November 2015 um 21:59<\/div>\n\n- \n
\n![\"\"](\"http:\/\/1.gravatar.com\/avatar\/d2c9c081dd6534b6d809c4925c778570?s=40&d=http%3A%2F%2F1.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
Roy<\/cite> sagt:<\/span><\/div>\n12. November 2015 um 00:38<\/div>\n\n
<\/p>\n
<\/p>\n
could be many things. check these two first :
\n1. CPU clock (must be 168 MHz and USB @48MHz)
\n2. Optimization should be : \u201cO0 = none\u201d<\/p>\n<\/div>\n<\/div>\n
<\/li>\n<\/ul>\n<\/li>\n
<\/p>\n
<\/p>\n
Hi, I\u2019m having a problem, the demo works, I can write in the pen drive. But when I try to use the library in another project the status change to USB_MSC_DEV_DETACHED, could it be because a conflict with another libraries?
\nI\u2019m using:
\n#include \u201cstm32_ub_lcd_2x16.h\u201d
\n#include \u201cstm32f4xx.h\u201d
\n#include \u201cstm32f4xx_gpio.h\u201d
\n#include \u201cstm32f4xx_rcc.h\u201d
\n#include \u201cstm32f4xx_tim.h\u201d
\n#include \u201cstm32f4xx_usart.h\u201d
\n#include \u201cmisc.h\u201d
\n#include \u201cstdio.h\u201d
\n#include \u201cstm32_ub_keymatrix.h\u201d
\n#include \u201cstm32_ub_led.h\u201d
\n#include \u201cstm32_ub_usb_msc_host.h\u201d<\/p>\n
Also I\u2019m using a library from the DHT11 sensor that uses USART but anothers ports.<\/p>\n
I created a function Copy that contains the code that it\u2019s in the while from the demo (if(UB_USB_MSC_HOST_Do()==USB_MSC_DEV_CONNECTED) { \u2026.)
\nWhen I need to copy something I call Copy (inside the main).
\nThe clock it\u2019s at 168MHz<\/p>\n
Thanks<\/p>\n<\/div>\n<\/div>\n
<\/p>\n
\n- \n
\n![\"\"](\"http:\/\/0.gravatar.com\/avatar\/67426419ead44d5afa132e92685bb460?s=40&d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
admin_ub<\/cite> sagt:<\/span><\/div>\n13. November 2015 um 20:20<\/div>\n\n- \n
\n![\"\"](\"http:\/\/0.gravatar.com\/avatar\/67426419ead44d5afa132e92685bb460?s=40&d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
admin_ub<\/cite> sagt:<\/span><\/div>\n13. November 2015 um 20:31<\/div>\n\n
<\/p>\n
<\/p>\n
dont add 1000 lines of code and try to find a failure.
\nMake a running version und add a single new function.
\nTest the new function (and all old functions) and so on.
\nThats the only way to handle big projects.<\/p>\n<\/div>\n<\/div>\n
<\/li>\n
<\/p>\n
<\/p>\n
besides\u2026the function \u201cUB_USB_MSC_HOST_Do()\u201d
\nmust called the whole time
\nmaybe you must use the Systick to do this<\/p>\n<\/div>\n<\/div>\n
<\/p>\n
\n- \n
\n![\"\"](\"http:\/\/1.gravatar.com\/avatar\/d2c9c081dd6534b6d809c4925c778570?s=40&d=http%3A%2F%2F1.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
Roy<\/cite> sagt:<\/span><\/div>\n23. November 2015 um 16:32<\/div>\n\n
<\/p>\n
<\/p>\n
Yes, after I wrote this I get how it works to see if it\u2019s connected or not.
\nMy problem now is that it recognizes as connected, but says is unmounted. I guess I\u2019m missing something<\/p>\n<\/div>\n<\/div>\n
<\/p>\n
\n- \n
\n![\"\"](\"http:\/\/1.gravatar.com\/avatar\/d2c9c081dd6534b6d809c4925c778570?s=40&d=http%3A%2F%2F1.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
Roy<\/cite> sagt:<\/span><\/div>\n23. November 2015 um 16:34<\/div>\n\n
<\/p>\n
<\/p>\n
I mean, only writes once, after that nothing, just connected but not mounted (I read a sensor and save the data, in a loop)<\/p>\n<\/div>\n<\/div>\n
<\/p>\n
\n- \n
\n![\"\"](\"http:\/\/0.gravatar.com\/avatar\/67426419ead44d5afa132e92685bb460?s=40&d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
admin_ub<\/cite> sagt:<\/span><\/div>\n23. November 2015 um 19:41<\/div>\n\n- \n
\n![\"\"](\"http:\/\/0.gravatar.com\/avatar\/8687948a1b128b08751b8c12bf24b0a5?s=40&d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
TomTom<\/cite> sagt:<\/span><\/div>\n12. November 2015 um 11:49<\/div>\n\n- \n
\n![\"\"](\"http:\/\/1.gravatar.com\/avatar\/d2c9c081dd6534b6d809c4925c778570?s=40&d=http%3A%2F%2F1.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
Roy<\/cite> sagt:<\/span><\/div>\n25. November 2015 um 01:38<\/div>\n\n
<\/p>\n
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try this flow :<\/p>\n
while(1) \n{ \n if(UB_USB_MSC_HOST_Do()==USB_MSC_DEV_CONNECTED) {\n if(UB_Fatfs_Mount(USB_0)==FATFS_OK) { \n if(UB_Fatfs_OpenFile(&myFile, \"USB_File.txt\", F_WR_CLEAR)==FATFS_OK) {\n while(UB_USB_MSC_HOST_Do()==USB_MSC_DEV_CONNECTED) {\n \/\/ 1. read here the data from your sensor\n \/\/ 2. write here the data to the file (with UB_FatFS_Write)\n \/\/\n \/\/ if you want to exit, use \"break\"\n }\n UB_Fatfs_CloseFile(&myFile);\n }\n UB_Fatfs_UnMount(USB_0);\n }\n }\n}\n\n<\/pre>\n<\/div>\n<\/div>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n
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Funktioniert aufs erste mal flashen einwandfrei.
\nHabe ebenfalls einen Intenso USB Stick mit 4GB verwendet.
\nAdapterkabel gibts g\u00fcnstig bei Amazon oder Ebay.<\/p>\n
Wiedermal vielen Dank f\u00fcr deine Seite!<\/p>\n<\/div>\n<\/div>\n
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Hi,me again (I cant reply in your answer so I write here)
\nThe flow you gave works, but, if I need to do something else,and then go back and write data in the stick,99% fails to mount it, it\u2019s like 1st time mounting it works, but 2nd fails (keeps connected, but unmounted). What could be the problem?<\/p>\n
Let\u2019s supose in the file I have 5 lines of text, if I need to read line 1,then 2,then3,then 2 again, it\u2019s that posible?
\nThere\u2019s a f_lseek in ff.h library, should use it?<\/p>\n
Thanks!<\/p>\n<\/div>\n<\/div>\n
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\n- \n
\n![\"\"](\"http:\/\/1.gravatar.com\/avatar\/d2c9c081dd6534b6d809c4925c778570?s=40&d=http%3A%2F%2F1.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
Roy<\/cite> sagt:<\/span><\/div>\n25. November 2015 um 08:10<\/div>\n\n
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I think I found the problem:
\nUB_Fatfs_Mount checks f_mount,f_mount checks chk_mounted. 1st time it\u2019s ok, but after that chk_mounted returns FR_NO_FILESYSTEM ( No FAT volume is found).
\nI changed the return value to FR_OK and now everytime I want to mount the USB, it works, but it shouldn\u2019t be like that, right?<\/p>\n<\/div>\n<\/div>\n
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\n- \n
\n![\"\"](\"http:\/\/0.gravatar.com\/avatar\/67426419ead44d5afa132e92685bb460?s=40&d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
admin_ub<\/cite> sagt:<\/span><\/div>\n25. November 2015 um 19:24<\/div>\n\n- \n
\n![\"\"](\"http:\/\/0.gravatar.com\/avatar\/67426419ead44d5afa132e92685bb460?s=40&d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
admin_ub<\/cite>
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maybe the drive needs a delay after plugin to be ready.
\ntry a loop until mount is ok.
\nand you dont have to mount a allready mounted device.<\/p>\n<\/div>\n<\/div>\n
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