Dear all, Thanks a lot for every consecutive help i get from this forum and a special thanks to Tsuneo.
I downloaded VCOM example program from keil but that doesn't fits to my requirement.
The code doesn't work if I transmit the data as soon as i receive the IN interrupt.
I want to transmit 64bytes in 1 ms. i tried changing the usbdesc.c but it doesn't transmits the data at this rate and makes the PC to go hang.
My minimum requirement is to tranmsit 30KBytes/sec.
I highly appreciate your help.
Hello.
First of all, I want to say that I don't know if this is the right forum to do the question, but after days searching in the web, reading papers and changing the code, I'll try to explain my dude here.
I'm programming a device, with a USB communication in order to communicate with PC. I use an ATmega1281 with MAX3420 as USB controller. I get the windows recognize the device as COM Port...but I can only send or only receive data. If I try to set number of endpoints to 2 in the Data Class Interface descriptor, windows return an error (code 10), and can't initialize the device. Here I show the descriptors I use. Thank you for your time in advance!
const unsigned char CD[]= // CONFIGURATION Descriptor {0x09, // bLength 0x02, // bDescriptorType = Config 67,0x00, // wTotalLength(L/H) = Nº Bytes (67[0x43}) (Sin cabeceras 48[0x30]) 0x4300 0x02, // bNumInterfaces = 2 0x01, // bConfigValue 0x00, // iConfiguration 0xC0, // bmAttributes. b7=1 b6=NO self-powered b5=RWU supported (1 0 1 0 0 0 0 0) 0x32, // MaxPower is 100 ma
// INTERFACE Descriptor 0x09, // length = 9 0x04, // type = IF 0x00, // InterFace Number = 0 0x00, // bAlternate Setting 0x01, // bNum Endpoints = 1 IN 0x02, // bInterfaceClass = 2 Communication 0x02, // bInterfaceSubClass = 2 0x01, // bInterfaceProtocol =1 (SubClass ACM=Abstract Control Mode, InterfaceProtocol=V.25ter, common AT commands) 0x00, // iInterface
// Header Functional Descriptor (marks beginning of the concatenated set of Functional Descriptors) 0x05, // bFunctionLength, Descriptor size in bytes --[18] 0x24, // bDescriptorType, CS_INTERFACE 0x00, // bDescriptorSubtype, Header Functional Descriptor 0x10,0x01, // bcdCDC, CDC specification release number in BCD format (1,1)
// Abstract Control Management Functional Descriptor 0x04, // bDescriptorLength, Descriptor size in bytes 0x24, // bDescriptorType, CS_INTERFACE 0x02, // bDescriptorSubtype, Abstract Control Management Functional Descriptor 0x06, // bmCapabilities, Support for the GET/SET_LINE_CODING, BREAK & SET_CONTROL_LINE_STATE (2->6)
// Union Functional Descriptor 0x05, // bFunctionLength, Descriptor size in bytes 0x24, // bDescriptorType, CS_INTERFACE 0x06, // bDescriptorSubtype, Union Functional Descriptor 0x00, // bMasterInterface, The controlling interface for the union (bInterfaceNumber of a Communication or Data Class interface in this configuration) 0x01, // bSlaveInterface0, The controlled interace in the union (bInterfaceNumber of an interface in this configuration)
// Call Management Functional Descriptor 0x05, // bFunctionLength, Descriptor size in bytes 0x24, // bDescriptorType, CS_INTERFACE 0x01, // bDescriptorSubtype, Call Management Functional Descriptor 0x03, // bmCapabilities, Device doesn't call management itself (0->3) 0x01, // bDataInterface, Interface used for call management
// Endpoint Descriptor EP3-IN 0x07, // bLength 0x05, // bDescriptorType (Endpoint) 0x83, // bEndpointAddress (EP3 IN) 0x03, // bmAttributes (interrupt = 3) 0x40,0x00, // wMaxPacketSize (8->64[0x0040]) 0x02, // bInterval, Maximum latency
// INTERFACE Descriptor 0x09, // length = 9 --[44] 0x04, // type = IF 0x01, // InterFace Number = 1 0x00, // bAlternate Setting 0x02, // bNum Endpoints = 2 (IN&OUT) 0x0A, // bInterfaceClass = A (Data) 0x00,0x00, // bInterfaceSubClass, bInterfaceProtocol (SubClass ACM=Abstract Control Mode, InterfaceProtocol=V.25ter, common AT commands) 0x00, // iInterface
// Endpoint Descriptor EP2-IN 0x07, // bLength 0x05, // bDescriptorType (Endpoint) 0x82, // bEndpointAddress (EP2-IN) 0x02, // bmAttributes (bulk = 2) 0x40,0x00, // wMaxPacketSize (64[0x40]) 0x00, // bInterval
// Endpoint Descriptor EP1-OUT 0x07, // bLength 0x05, // bDescriptorType (Endpoint) 0x01, // bEndpointAddress (EP1-OUT) 0x02, // bmAttributes (bulk = 2) 0x40,0x00, // wMaxPacketSize (64[0x40]) 0x00, // bInterval };
Start a new thread, and post your descriptors as code, so they are readable.