Kinetis MicrocontrollersのトピックRe: What is the buffer length in USB HID in kl82z? https://community.nxp.com/t5/Kinetis-Microcontrollers/What-is-the-buffer-length-in-USB-HID-in-kl82z/m-p/658296#M40364 <HTML><HEAD></HEAD><BODY><P>The maximum buffer size of a HID packet is 64 bytes for USB 2.0 and up.</P><P></P><P><A class="link-titled" href="http://www.usb.org/developers/hidpage/" title="http://www.usb.org/developers/hidpage/">USB.org - HID Tools</A>&nbsp;</P><P></P><P><A class="link-titled" href="http://janaxelson.com/usbc.htm" title="http://janaxelson.com/usbc.htm">Jan Axelson's Lakeview Research</A>&nbsp;book "USB Complete" is a thorough introduction to USB.</P></BODY></HTML> Mon, 10 Apr 2017 13:20:08 GMT bobpaddock 2017-04-10T13:20:08Z What is the buffer length in USB HID in kl82z? https://community.nxp.com/t5/Kinetis-Microcontrollers/What-is-the-buffer-length-in-USB-HID-in-kl82z/m-p/658295#M40363 <HTML><HEAD></HEAD><BODY><P>In <EM>usb_device_descriptor.h</EM> file&nbsp;is&nbsp;defined buffers and packets sizes.</P><P></P><P>Why buffer size is 8 Bytes?</P><P>Can increase the buffer?&nbsp;</P><P>How many&nbsp;possible increase the buffer? What is maximum size of buffers?</P><P></P><P>#define USB_HID_GENERIC_IN_BUFFER_LENGTH (8U)<BR />#define USB_HID_GENERIC_OUT_BUFFER_LENGTH (8U)<BR />...</P><P>#define HS_HID_GENERIC_INTERRUPT_OUT_PACKET_SIZE (8U)<BR />#define FS_HID_GENERIC_INTERRUPT_OUT_PACKET_SIZE (8U)<BR />#define HS_HID_GENERIC_INTERRUPT_OUT_INTERVAL (0x4U) /* 2^(4-1) = 1ms */<BR />#define FS_HID_GENERIC_INTERRUPT_OUT_INTERVAL (0x01U)</P><P></P><P></P><P>#define HS_HID_GENERIC_INTERRUPT_IN_PACKET_SIZE (8U)<BR />#define FS_HID_GENERIC_INTERRUPT_IN_PACKET_SIZE (8U)<BR />#define HS_HID_GENERIC_INTERRUPT_IN_INTERVAL (0x4U) /* 2^(4-1) = 1ms */<BR />#define FS_HID_GENERIC_INTERRUPT_IN_INTERVAL (0x01U)</P></BODY></HTML> Fri, 07 Apr 2017 11:35:30 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/What-is-the-buffer-length-in-USB-HID-in-kl82z/m-p/658295#M40363 rysardsuboc 2017-04-07T11:35:30Z Re: What is the buffer length in USB HID in kl82z? https://community.nxp.com/t5/Kinetis-Microcontrollers/What-is-the-buffer-length-in-USB-HID-in-kl82z/m-p/658296#M40364 <HTML><HEAD></HEAD><BODY><P>The maximum buffer size of a HID packet is 64 bytes for USB 2.0 and up.</P><P></P><P><A class="link-titled" href="http://www.usb.org/developers/hidpage/" title="http://www.usb.org/developers/hidpage/">USB.org - HID Tools</A>&nbsp;</P><P></P><P><A class="link-titled" href="http://janaxelson.com/usbc.htm" title="http://janaxelson.com/usbc.htm">Jan Axelson's Lakeview Research</A>&nbsp;book "USB Complete" is a thorough introduction to USB.</P></BODY></HTML> Mon, 10 Apr 2017 13:20:08 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/What-is-the-buffer-length-in-USB-HID-in-kl82z/m-p/658296#M40364 bobpaddock 2017-04-10T13:20:08Z