I'm building off of the project here: http://www.pjrc.com/teensy/usb_k...
I can create new interrupt endpoints, at least IN endpoints, and talk to them (After updating the descriptor, and all). But, I can't seem to set their type to isochronous and continue to talk to them.
When I use libusb-1.0, I get error -84's on all of the isochronous packets.
I've configured my endpoints as follows:
#define ENDPOINT0_SIZE 32
#define HARDWARE_INTERFACE 0
#define HARDWARE_EP_SIZE 8
#define KEYBOARD_BUFFER EP_DOUBLE_BUFFER
static const uint8_t PROGMEM endpoint_config_table[] = {
1, EP_TYPE_ISOCHRONOUS_IN, EP_SIZE(HARDWARE_EP_SIZE) | EP_DOUBLE_BUFFER,
1, EP_TYPE_ISOCHRONOUS_OUT, EP_SIZE(HARDWARE_EP_SIZE) | EP_DOUBLE_BUFFER,
1, EP_TYPE_INTERRUPT_IN, EP_SIZE(HARDWARE_EP_SIZE) | EP_DOUBLE_BUFFER,
1, EP_TYPE_INTERRUPT_OUT, EP_SIZE(HARDWARE_EP_SIZE) | EP_DOUBLE_BUFFER,
};
Just checking, my lsusb -vv looks like this:
Bus 005 Device 046: ID 16c0:047c VOTI
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 32
idVendor 0x16c0 VOTI
idProduct 0x047c
bcdDevice 1.00
iManufacturer 1 [Manufacturer here]
iProduct 2 [Product here]
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 46
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xc0
Self Powered
MaxPower 100mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 4
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 1
bInterfaceProtocol 1
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 1
Transfer Type Isochronous
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 1
Transfer Type Isochronous
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x04 EP 4 OUT
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 1
Device Status: 0x0000
(Bus Powered)
And, I'm attempting to push data back using the following:
ISR(USB_GEN_vect)
{
[Various handling code]
[epts cycles 1, 2, 3, 4]
if ((intbits & (1<<SOFI)) && usb_configuration ) {
UENUM = epts;
if (UEINTX & (1<<RWAL))
{
UEDATX = 0x10 + epts;
UEDATX = 0x20 + epts;
UEDATX = 0x30 + epts;
UEDATX = 0x40 + epts;
UEDATX = 0x50 + epts;
UEDATX = 0x60 + epts;
UEDATX = 0x70 + epts;
UEDATX = 0x80 + epts;
UEINTX = 0x2A;
}
}
}
How do you populate the buffer with an isochronous transfer? Can you use double-buffered transfers? Does anyone have an example of an isochronous transfer on the megaXXuX series?
Thanks
Charles