UsbIsoOpen: Difference between revisions
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==Related Functions== | ==Related Functions== | ||
* [[UsbStartIsoTransfer]] | |||
* [[UsbIsoClose]] | |||
* [[UsbOpen]] | |||
[[Category:USBCalls]] | [[Category:USBCalls]] | ||
Latest revision as of 17:40, 12 February 2017
Description
Allocates bandwidth and resources for Isochronous Transfer.
Syntax
ulrc = UsbIsoOpen(Handle,ucEndpoint,ucAltSetting,usBufferCount,usFrameLength)
Parameters
- Handle
- the Device Handle received from the previous UsbOpen.
- ucEndpoint
- the Endpoint Number appropriate for the data transfer.
- ucAltSetting
- the Alternate Setting of the interface having this endpoint.
- usBufferCount
- the number of isochronous data buffers. Must not exceed 8.
- usFrameLength
- the maximum number of bytes in an isochronous frame.
Return Code
0x0000 - NO_ERROR
Errors
0x0037 - ERROR_DEV_NOT_EXIST 0x0057 - ERROR_INVALID_PARAMETER 0x1B58 - USB_NOT_INIT 0xFF13 - USB_IDC_PARMERR 0xFF14 - USB_IDC_ALLOCERR 0xFF15 - USB_IDC_NOBANDWIDTH 0xFF18 - USB_IDC_ADDRINV
Remarks
Example Code
//Code Snippet - UsbIsoOpen
{
APIRET ulrc;
UCHAR ucAltSetting = 1;
UCHAR ucEndpoint = 0x86;
USHORT usBufferCount = 3;
USHORT usFrameLength = 0x44;
ulrc = UsbIsoOpen(Handle,ucEndpoint,ucAltSetting,usBufferCount,usFrameLength);
printf("\nUsbIsoOpen - ulrc: 0x%04X (%hu)",ulrc,ulrc);
}