topic USB Buffer Descriptor in ColdFire/68K Microcontrollers and Processors https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/USB-Buffer-Descriptor/m-p/259318#M11677 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>I have a question regarding usb buffer descriptor. I setup one bulk IN endpoint (with max. packet size 64 bytes) on my MCF52259. Now I want to send a stream of data through it. According to USB specs, DATA0/DATA1 are used for synchronization purposes only. Now, if I have set two buffers simultaneously in EVEN and ODD buffer descriptors for better throughput. With even buffer descriptor set to DATA0 and odd buffer descriptor set to DATA1.</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>If an error comes up on DATA0 or I have to send it again, then obviously I need to send it on DATA1. Then my question is that how would I maximize the throughput as I can't send the second buffer as the first one is not completed.</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P><SPAN style="font-size: 10pt; line-height: 1.5em;">Regards.</SPAN></P></BODY></HTML> Mon, 08 Jul 2013 12:40:06 GMT salman83 2013-07-08T12:40:06Z USB Buffer Descriptor https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/USB-Buffer-Descriptor/m-p/259318#M11677 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>I have a question regarding usb buffer descriptor. I setup one bulk IN endpoint (with max. packet size 64 bytes) on my MCF52259. Now I want to send a stream of data through it. According to USB specs, DATA0/DATA1 are used for synchronization purposes only. Now, if I have set two buffers simultaneously in EVEN and ODD buffer descriptors for better throughput. With even buffer descriptor set to DATA0 and odd buffer descriptor set to DATA1.</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>If an error comes up on DATA0 or I have to send it again, then obviously I need to send it on DATA1. Then my question is that how would I maximize the throughput as I can't send the second buffer as the first one is not completed.</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P><SPAN style="font-size: 10pt; line-height: 1.5em;">Regards.</SPAN></P></BODY></HTML> Mon, 08 Jul 2013 12:40:06 GMT https://community.nxp.com/t5/ColdFire-68K-Microcontrollers/USB-Buffer-Descriptor/m-p/259318#M11677 salman83 2013-07-08T12:40:06Z