LPC Microcontrollers中的主题 Reading more than 64 bytes and using a Circular buffer suing USBD API on lpc43xx https://community.nxp.com/t5/LPC-Microcontrollers/Reading-more-than-64-bytes-and-using-a-Circular-buffer-suing/m-p/553496#M14573 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by pra18 on Wed Nov 12 09:31:46 MST 2014</STRONG><BR /><SPAN>I am migrating from UART to a USB CDC on my custom board. The UART on my custom board is handling 256 byte receptions currently and also on USB CDC will this required to be supported.</SPAN><BR /><BR /><SPAN>The Bulk endpoint maximum is 64 bytes in which case, for 256 byte transfers there needs to be some mechanism to handle mostly a circle buffer.</SPAN><BR /><BR /><SPAN>I see that in&nbsp; the USB VCOM example of lpcopen 2_0_12 , and in&nbsp; Bulk EVT_OUT handler code , the ReadEP is called and this is where the functionality needs to be added to support more than 64 bytes&nbsp; and also there is needed a helper function like Read to assist this Build EVT_OUT.I see something like VCOMBRead in that example.</SPAN><BR /><BR /><SPAN>Any suggestions how this can be achieved and any examples using a circular buffer that can be referred to in this case?</SPAN><BR /><BR /><SPAN>Thanks, </SPAN><BR /></BODY></HTML> Wed, 15 Jun 2016 18:37:04 GMT lpcware 2016-06-15T18:37:04Z Reading more than 64 bytes and using a Circular buffer suing USBD API on lpc43xx https://community.nxp.com/t5/LPC-Microcontrollers/Reading-more-than-64-bytes-and-using-a-Circular-buffer-suing/m-p/553496#M14573 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by pra18 on Wed Nov 12 09:31:46 MST 2014</STRONG><BR /><SPAN>I am migrating from UART to a USB CDC on my custom board. The UART on my custom board is handling 256 byte receptions currently and also on USB CDC will this required to be supported.</SPAN><BR /><BR /><SPAN>The Bulk endpoint maximum is 64 bytes in which case, for 256 byte transfers there needs to be some mechanism to handle mostly a circle buffer.</SPAN><BR /><BR /><SPAN>I see that in&nbsp; the USB VCOM example of lpcopen 2_0_12 , and in&nbsp; Bulk EVT_OUT handler code , the ReadEP is called and this is where the functionality needs to be added to support more than 64 bytes&nbsp; and also there is needed a helper function like Read to assist this Build EVT_OUT.I see something like VCOMBRead in that example.</SPAN><BR /><BR /><SPAN>Any suggestions how this can be achieved and any examples using a circular buffer that can be referred to in this case?</SPAN><BR /><BR /><SPAN>Thanks, </SPAN><BR /></BODY></HTML> Wed, 15 Jun 2016 18:37:04 GMT https://community.nxp.com/t5/LPC-Microcontrollers/Reading-more-than-64-bytes-and-using-a-Circular-buffer-suing/m-p/553496#M14573 lpcware 2016-06-15T18:37:04Z