Hier eine Library um den USB-OTG-Port am Discovery-Board im CDC-Mode zu betreiben. Damit wird beim Verbinden mit einem PC ein virtueller Comport eingerichtet \u00fcber den man (wie per UART) Daten austauschen kann.<\/p>\n
Auf der PC Seite muss der \u201cVirtualComPort-Driver von ST\u201d installiert sein. Den gibts auf der ST-Seite zum download (ich hab mit Version 1.3.1 getestet). Die LIB erwartet beim empfang als Endekennung das Zeichen \u201c0x0D\u201d = CarriageReturn Beim Protokoll (Baudrate, Stopbits usw) muss nichts eingestellt werden, das wird vom USB-Treiber erledigt. Bei einer Geschwindigkeitsmessung f\u00fcr das senden von einem Block von 1024 Bytes vom PC zur CPU bin ich auf ca. 4ms gekommen, was ca. 256kByte\/sec entspricht (ca. 2Mbit\/sec)\u2026ob das aber durchgehend eingehalten wird, kann ich nicht sagen. In der Library gibt es eine Sende und eine Empfangsfunktion f\u00fcr Strings und eine Funktion zum testen ob die USB-Verbindung steht.<\/p>\n Ich hab auch ein \u201cmini\u201d PC-Terminal-Programm geschrieben um die Funktion zu testen.<\/p>\n Es wird ein USB-Kabel mit Micro-USB-Stecker ben\u00f6tigt. (gibts bei EBay oder Amazon)<\/p>\n Benutzte Pins<\/strong><\/p>\n Voraussetzungen :<\/strong><\/p>\n Enumerationen :<\/strong><\/p>\n .<\/strong><\/p>\n .<\/strong><\/p>\n Funktionen :<\/strong><\/p>\n Beispiel :<\/strong><\/p>\n Hier die Library zum\u00a0Download :<\/strong><\/p>\n ub_stm32f4_usb_cdc_v104<\/a><\/p>\n Hier der komplette CooCox-Projektordner zum\u00a0Download :<\/strong><\/p>\n Demo_31_USB_CDC<\/a><\/p>\n Hier der Link zu dem PC-Programm :<\/p>\n PC-Programme<\/a><\/p>\n
\nAuf der ST-Seite nach \u201cSTSW-STM32102\u2033 suchen.<\/em><\/p>\n
\n(das muss der PC also am Stringende anh\u00e4ngen)<\/p>\n
\n(Nachtrag : im Capture-Tool-Projekt komme ich auf Datenraten von ca. 7MBit\/sec, wobei USB-FullSpeed mit max 12MBit\/sec spezifiziert ist)<\/p>\n PA8 -> USB_OTG_SOF (wird nicht benutzt)\r\n PA9 -> USB_OTG_VBUS\r\n PA10 -> USB_OTG_ID\r\n PA11 -> USB_OTG_DM\r\n PA12 -> USB_OTG_DP<\/pre>\n
Benutzte Module der CooCox-IDE : GPIO, MISC\r\nBenutzte Librarys : keine<\/pre>\n
typedef enum {\r\n USB_CDC_NO_INIT =0, \/\/ USB-Schnittstelle noch nicht initialisiert\r\n USB_CDC_DETACHED, \/\/ USB-Verbindung getrennt\r\n USB_CDC_CONNECTED \/\/ USB-Verbindung hergestellt\r\n}USB_CDC_STATUS_t;<\/pre>\ntypedef enum {\r\n NONE = 0, \/\/ keine Endekennung\r\n LFCR, \/\/ LineFeed + CarriageReturn (0x0A,0x0D)\r\n CRLF, \/\/ CarriageReturn + LineFeed (0x0D,0x0A)\r\n LF, \/\/ nur LineFeed (0x0A)\r\n CR \/\/ nur CarriageReturn (0x0D)\r\n}USB_CDC_LASTBYTE_t;<\/pre>\ntypedef enum {\r\n RX_USB_ERR =0, \/\/ keine USB Verbindung\r\n RX_EMPTY, \/\/ nichts empfangen\r\n RX_READY \/\/ es steht was im Empfangspuffer\r\n}USB_CDC_RXSTATUS_t;<\/pre>\nvoid UB_USB_CDC_Init(void); \/\/ zum init der USB-Schnittstelle\r\nUSB_CDC_STATUS_t UB_USB_CDC_GetStatus(void); \/\/ USB Status abpr\u00fcfen\r\nErrorStatus UB_USB_CDC_SendString(char *ptr, USB_CDC_LASTBYTE_t end_cmd); \/\/ zum senden eines Strings per USB\r\nUSB_CDC_RXSTATUS_t UB_USB_CDC_ReceiveString(char *ptr); \/\/ zum empfangen eines Strings per USB<\/pre>\n
\/\/--------------------------------------------------------------\r\n\/\/ File : main.c\r\n\/\/ Datum : 07.04.2013\r\n\/\/ Version : 1.0\r\n\/\/ Autor : UB\r\n\/\/ EMail : mc-4u(@)t-online.de\r\n\/\/ Web : www.mikrocontroller-4u.de\r\n\/\/ CPU : STM32F4\r\n\/\/ IDE : CooCox CoIDE 1.7.0\r\n\/\/ Module : CMSIS_BOOT, M4_CMSIS_CORE\r\n\/\/ Funktion : Demo der USB-CDC-Library\r\n\/\/ Hinweis : Diese zwei Files muessen auf 8MHz stehen\r\n\/\/ \"cmsis_boot\/stm32f4xx.h\"\r\n\/\/ \"cmsis_boot\/system_stm32f4xx.c\"\r\n\/\/--------------------------------------------------------------\r\n\r\n#include \"main.h\"\r\n#include \"stm32_ub_usb_cdc.h\"\r\n\r\nint main(void)\r\n{\r\n char buf[APP_TX_BUF_SIZE]; \/\/ puffer fuer Datenempfang\r\n USB_CDC_RXSTATUS_t check;\r\n\r\n SystemInit(); \/\/ Quarz Einstellungen aktivieren\r\n\r\n \/\/ Init vom USB-OTG-Port als CDC-Device\r\n \/\/ (Virtueller-ComPort)\r\n UB_USB_CDC_Init();\r\n\r\n while(1)\r\n {\r\n \/\/ Test ob USB-Verbindung zum PC besteht\r\n if(UB_USB_CDC_GetStatus()==USB_CDC_CONNECTED) {\r\n \/\/ Ceck ob Daten per USB empfangen wurden\r\n check=UB_USB_CDC_ReceiveString(buf);\r\n if(check==RX_READY) {\r\n \/\/ wenn Daten empfangen wurden\r\n \/\/ als Echo wieder zur\u00fccksenden\r\n \/\/ (mit LineFeed+CarriageReturn)\r\n UB_USB_CDC_SendString(buf,LFCR);\r\n }\r\n }\r\n }\r\n}\r\n<\/pre>\n71 Antworten auf 31-USB_CDC-Library (STM32F4)<\/em><\/h3>\n
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Hi. Thanks for you tutorials.
\nhttp:\/\/mikrocontroller.bplaced.net\/wordpress\/?page_id=1263<\/a>
\ni have some problems.<\/p>\n
first problem \u2013 i can use your terminal to comunicate with device, but i cant communicante with other terminals. Nothing is returning. i used string such as TEST0x0D<\/p>\n
Second problem. when i send string about 20 times \u2013 stm32f4 goes crasy and send some string all time. string looks like \u201c*P[Z! F@`W:BO!(F[(y@tr@}{\u201cBZr-9pzQ2ol\u201d<\/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>\n4. Mai 2013 um 09:29<\/div>\n\n
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Hi,
\nyour terminal must send a \u201cCarriageReturn\u201d at the end of the string, instead of the characters \u201c0x0D\u201d. So when you try to send \u201cTEST\u201d the terminal must send 5 Bytes : 0\u00d754, 0\u00d745, 0\u00d753, 0\u00d754, 0x0D<\/p>\n
To verify the second problem i need your complete Projekt (main.c). please send it to me as zip-file.<\/p>\n<\/div>\n<\/div>\n
<\/p>\n
\n- \n
\n![\"\"](\"http:\/\/1.gravatar.com\/avatar\/59c0a7621a39d7149fad30cd9e694949?s=40&d=http%3A%2F%2F1.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
Dmitriy<\/cite> sagt:<\/span><\/div>\n4. Mai 2013 um 11:25<\/div>\n\n
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I have second problem on you code as is. with absolutelly no changes. and use your terminal with word \u201cHELP\u201d.
\nsend 20 times and have infine loop with strange string comes all the time.<\/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>\n4. Mai 2013 um 11:55<\/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>\n4. Mai 2013 um 12:12<\/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>\n4. Mai 2013 um 14:01<\/div>\n\n
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uhh..ok, i will check this here, hang on.<\/p>\n<\/div>\n<\/div>\n
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ok, i have here the same problem !!![\":-)\"](\"wp-includes\/images\/smilies\/icon_smile.gif\")
<\/p>\n<\/div>\n<\/div>\n
\nI will check this and give a feedback, thanks for comment
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BUG is now fixed, Version 1.2 is online, please test it again.<\/p>\n<\/div>\n<\/div>\n
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\n- \n
\n![\"\"](\"http:\/\/0.gravatar.com\/avatar\/c34021a4be9ba725fa37b99785f0d622?s=40&d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
STler<\/cite> sagt:<\/span><\/div>\n3. Juli 2013 um 17:08<\/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>\n3. Juli 2013 um 19:05<\/div>\n\n- \n
\n![\"\"](\"http:\/\/0.gravatar.com\/avatar\/c3135eb4a7f9496413c33b7be6b998ba?s=40&d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
lungfish<\/cite> sagt:<\/span><\/div>\n7. Mai 2013 um 15:48<\/div>\n\n
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Have you updated the Terminal in Version 1.2?
\nMy download today is version 1.0<\/p>\n
Thanks and best regards!<\/p>\n<\/div>\n<\/div>\n
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the actual Version of the Terminal_Program is 1.0 and the STM-Library has Version 1.4 (there was no need to update the Terminal because the BUG was in the STM-Library)<\/p>\n<\/div>\n<\/div>\n
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Hi there!
\nFirst of all \u2013 thanks for sharing your code with the world.<\/p>\n
I just downloaded ub_stm32f4_usb_cdc_v102 and compiled it in Coocox 1.7.<\/p>\n
My device uses a STM32F407VG, HSE is 8MHz. The USB-FS connection is device only, e.g. PA8-SOF and PA10-ID are not connected.
\nDFU with DFUSE works like a charm.<\/p>\n
Problem with your project: My Win7 doesn\u2019t even register a new USB device.
\nWhen crawling through the code I asked myself, if it\u2019s correct to use PA9-VBUS as output (thus never seeing the connection status).<\/p>\n
Looking forward to your reply, lungfish<\/p>\n<\/div>\n<\/div>\n
<\/p>\n
\n- \n
\n![\"\"](\"http:\/\/0.gravatar.com\/avatar\/c3135eb4a7f9496413c33b7be6b998ba?s=40&d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
lungfish<\/cite> sagt:<\/span><\/div>\n7. Mai 2013 um 17:17<\/div>\n\n
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I withdraw the part about PA9-VBUS being an output. Sorry.
\nStill trying to get the example running, though.<\/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>\n8. Mai 2013 um 08:29<\/div>\n\n
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Hi,
\nSOF (PA8) is not used but i am not sure about the ID-Pin (PA10) \u2026try to connect it to GND. Have you installed the right VCP-Driver from STM ?<\/p>\n<\/div>\n<\/div>\n
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\n- \n
\n![\"\"](\"http:\/\/0.gravatar.com\/avatar\/c3135eb4a7f9496413c33b7be6b998ba?s=40&d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
lungfish<\/cite> sagt:<\/span><\/div>\n8. Mai 2013 um 11:10<\/div>\n\n
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Sooo \u2013 I should have quit earlier, yesterday.
\nAnyways \u2013 I took an Olimex STM32-E407, changed its HSE to 8MHz and
\n– your example works without any mods.
\nNow that I have a baseline to start from, I\u2019ll go back to my board and we\u2019ll see.<\/p>\n<\/div>\n<\/div>\n
<\/p>\n
\n- \n
\n![\"\"](\"http:\/\/0.gravatar.com\/avatar\/c3135eb4a7f9496413c33b7be6b998ba?s=40&d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
lungfish<\/cite> sagt:<\/span><\/div>\n8. Mai 2013 um 12:17<\/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>\n8. Mai 2013 um 12:48<\/div>\n\n- \n
\n![\"\"](\"http:\/\/0.gravatar.com\/avatar\/c3135eb4a7f9496413c33b7be6b998ba?s=40&d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
lungfish<\/cite> sagt:<\/span><\/div>\n8. Mai 2013 um 13:21<\/div>\n\n- \n
\n![\"\"](\"http:\/\/0.gravatar.com\/avatar\/0718d9eba3a0a5b48654b4a7d235b1ee?s=40&d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
Malte<\/cite> sagt:<\/span><\/div>\n21. Mai 2013 um 08:13<\/div>\n\n
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The ID-Pin can be left open, even the internal PullUp is OK.<\/p>\n
Soo \u2013 for safety reasons I had a 1k resistor between PA9 and VBUS.
\nChange that to 22R and the show is on the road.
\nNow the unpowered device sucks power from the PC, though.<\/p>\n<\/div>\n<\/div>\n
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Nice. On the STM-Discovery-Board there isn\u2019t a resistor anywhere. PA9 is directly routed to the USB VBUS Pin.<\/p>\n<\/div>\n<\/div>\n
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Without the resistor, the unpowered board sucks power through the internal PA9 protection diode.
\nI\u2019ll have to think about a solution for that. Could kill the STM32 under the wrong circumstances.<\/p>\n<\/div>\n<\/div>\n
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Hi,<\/p>\n
thanks for sharing your librarys.<\/p>\n
How fast is this CDC Library? I need to transmit every 20ms a maximum of 1024 byte in approx 5 ms (something about 1.6MBit). So, no continous stream. In a short time quite a few data.
\nI think isochronous transfer would be the best. But i want to avoid this cause i havent found any good example for this (i think i would have to write Win and Linux driver on my own).
\nOr do anyone found examples USB isochronous with win+linux driver + demoapplication (never wrote a program for linux or win)<\/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>\n21. Mai 2013 um 08:45<\/div>\n\n
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I don\u2019t know the speed of the USB-Transfer, but i can check this. I think the bottleneck is on the PC-Side, with the \u201cnormal\u201d Terminal settings you can get 115200 Baud wich is too slow. It is not a easy problem with no experience![\":-)\"](\"wp-includes\/images\/smilies\/icon_smile.gif\")
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\n- \n
\n![\"\"](\"http:\/\/0.gravatar.com\/avatar\/0718d9eba3a0a5b48654b4a7d235b1ee?s=40&d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
Malte<\/cite> sagt:<\/span><\/div>\n21. Mai 2013 um 09:46<\/div>\n\n
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<\/p>\n
Hi,<\/p>\n
thanks for your fast reply. I found this:
\nhttp:\/\/forum.chibios.org\/phpbb\/viewtopic.php?f=3&t=523<\/a>
\nBut, as i understand, thats bulk mode which is for high data rates, but not for time critical processes. But i need to transfer my \u201cprocess image\u201d every 20 ms
\nBut, maybe i give it a try.<\/p>\n
Maybe using hterm? Or linux.<\/p>\n
USB or writing a OS driver\u2026 till now uart was always suitable for my projects\u2026<\/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>\n21. Mai 2013 um 21:12<\/div>\n\n- \n
\n![\"\"](\"http:\/\/0.gravatar.com\/avatar\/0718d9eba3a0a5b48654b4a7d235b1ee?s=40&d=http%3A%2F%2F0.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
Malte<\/cite> sagt:<\/span><\/div>\n22. Mai 2013 um 08:56<\/div>\n\n- \n
\n![\"\"](\"http:\/\/1.gravatar.com\/avatar\/306c865b1604856e094a936a4183f88f?s=40&d=http%3A%2F%2F1.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
Peter<\/cite> sagt:<\/span><\/div>\n20. Juni 2013 um 21:36<\/div>\n\n
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now i checked the speed with a terminal program (in a quick and dirty test) . For a block of 1024 Bytes (plus one end character) i measured a time between 3 and 4 ms. So this is in your limit. But i dont know what happend by repeating this every 20ms\u2026it\u2019s on you to test this![\":-)\"](\"wp-includes\/images\/smilies\/icon_smile.gif\")
To do this with my Library you have to change the size of the Receive Buffer (File=usbd_cdc_vcp.h) \u2026use this :
\n#define APP_TX_BUF_SIZE 2048<\/p>\n<\/div>\n<\/div>\n
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Thanks for you test. I will try to setup a linux OS an fire all 20ms a given load. I will read the data and compare it.
\nAgain, thanks for the test!<\/p>\n<\/div>\n<\/div>\n
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Hallo,
\ndanke f\u00fcr das Demo!
\nIch verwende ein STM32F4-Discovery und Win7 x64 mit dem ST Treiber 1.3.1. Alles funktioniert bestens.
\nWenn man allerdings bei einer ge\u00f6ffneten Verbindung (z.B. Open in deinem Terminal) einen Reset auf dem Discovery ausl\u00f6st, ist der PC \u2018beleidigt\u2019. Der Ger\u00e4temanager zeigt zwar beim Loslassen des Resettasters wieder einen COM Port an, man bekommt aber keine Verbindung. Egal ob Close+Open oder Neustart des Terminals. Erst nach dem Schlie\u00dfen des Terminals, einem Reset am Discovery und einem Neustart des Terminals funktioniert der Open wieder.
\nKennt jemand eine L\u00f6sung f\u00fcr dieses Problem?<\/p>\n<\/div>\n<\/div>\n
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\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>\n21. Juni 2013 um 18:29<\/div>\n\n
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ja, mein Terminal Programm ist \u201cQuick&Dirty\u201d such einfach ein anderes PC-Programm mit Fehlerbehandlung![\":-)\"](\"wp-includes\/images\/smilies\/icon_smile.gif\")
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\n- \n
\n![\"\"](\"http:\/\/1.gravatar.com\/avatar\/306c865b1604856e094a936a4183f88f?s=40&d=http%3A%2F%2F1.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
Peter<\/cite> sagt:<\/span><\/div>\n22. Juni 2013 um 10:31<\/div>\n\n- \n
\n![\"\"](\"http:\/\/1.gravatar.com\/avatar\/306c865b1604856e094a936a4183f88f?s=40&d=http%3A%2F%2F1.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
Peter<\/cite> sagt:<\/span><\/div>\n21. Juni 2013 um 08:05<\/div>\n\n
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Mit Hyperterminal und ZOC habe ich das gleiche Problem. Schaut aus als w\u00e4re es ein Treiberproblem. Eine Fehlerbehandlung auf dem PC reicht wahrscheinlich nicht aus, da man das Discaovery zus\u00e4tzlich reseten muss.
\nBin weiterhin f\u00fcr Ideen und Tips dankbar.<\/p>\n<\/div>\n<\/div>\n
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Hier noch ein Hinweis.
\nDie ST USB OTG Library hat einen bug, der bei dir evtl. noch nicht abgefangen wurde (google mal nach ep->xfer_count). Bei mir wurden Unmengen an USB Interrupts ausgel\u00f6st. Wenn du in usb_dcd_int.c nach Zeile 468 folgende vier Codezeilen einf\u00fcgst sollte das Problem beseitigt sein:<\/p>\n
\nif( ep->xfer_count >= ep->xfer_len) {
\nuint32_t fifoemptymsk = 1 < < ep->num;
\nUSB_OTG_MODIFY_REG32(&pdev->regs.DREGS->DIEPEMPMSK, fifoemptymsk, 0);
\nbreak;
\n}
\n<\/code><\/p>\n<\/div>\n<\/div>\n
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\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>\n21. Juni 2013 um 18:30<\/div>\n\n
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F\u00fcr Quellcode gibts die Code-Tags, die sollten funktionieren (ich hab die anderen Posts gel\u00f6scht) und zu dem Bug-Fix : wann kommt dieser Fehler vor mit den vielen Interrupts ?<\/p>\n<\/div>\n<\/div>\n
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\n![\"\"](\"http:\/\/1.gravatar.com\/avatar\/306c865b1604856e094a936a4183f88f?s=40&d=http%3A%2F%2F1.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D40&r=G\")
Peter<\/cite> sagt:<\/span><\/div>\n22. Juni 2013 um 10:46<\/div>\n\n
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Beim Senden von Daten. Wegen der hohen MCU Leistung des STM32F4 f\u00e4llt das zuerst nicht auf. Bei einer zeitkritischen Anwendung kann man dann aber lange nach dem Fehler suchen.<\/p>\n
Im ST e2e Forum gibt es einen Beitrag dazu. Da wird auch die L\u00f6sung beschrieben. Hier ein kleiner Auszug:<\/p>\n
When idle I get 1000 IRQs per second, as expected (the SOF IRQ).
\nWhen transmitting about 200Kbytes\/second I get about 32,000 IRQs per second!
\nHier der Link:
\nhttps:\/\/my.st.com\/public\/STe2ecommunities\/mcu\/Lists\/cortex_mx_stm32\/Flat.aspx?RootFolder=https%3a%2f%2fmy%2est%2ecom%2fpublic%2fSTe2ecommunities%2fmcu%2fLists%2fcortex_mx_stm32%2fYet%20another%20STM32F1057%20USB%20OTG%20driver%20issue%20%28VCP%20device%29&FolderCTID=0x01200200770978C69A1141439FE559EB459D7580009C4E14902C3CDE46A77F0FFD06506F5B¤tviews=1235<\/a><\/p>\n<\/div>\n<\/div>\n
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admin_ub<\/cite>