topic LPC1769: Data valid flag is not set for bulk transfers in LPC Microcontrollers https://community.nxp.com/t5/LPC-Microcontrollers/LPC1769-Data-valid-flag-is-not-set-for-bulk-transfers/m-p/522967#M5603 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by sturzi on Tue Apr 07 00:45:29 MST 2015</STRONG><BR /><SPAN>Hi,</SPAN><BR /><SPAN>I was hoping someone could help me with this issue. While stress testing the mass storage class on an LPC1769 we found an issue for which we don't have an explanation.</SPAN><BR /><BR /><SPAN>Every now and then (in the order of about 15 minutes) when processing the received data the DV (data valid) bit in the USBRxPlen register is not set (PKT_LNGTH and PKT_RDY however are set as expected). In the user manual it states that for non-isochronous transfers no interrupt is generated if the data isn't valid, therefore it is a bit of a mystery why this happens. It only says that an invalid packet can be generated with a bus reset, but since no bus reset happens this can't be the issue.</SPAN><BR /><SPAN>If anyone has more information regarding this issue I'd be very interested to hear it.</SPAN><BR /><BR /><SPAN>Thanks</SPAN></BODY></HTML> Wed, 15 Jun 2016 16:43:12 GMT lpcware 2016-06-15T16:43:12Z LPC1769: Data valid flag is not set for bulk transfers https://community.nxp.com/t5/LPC-Microcontrollers/LPC1769-Data-valid-flag-is-not-set-for-bulk-transfers/m-p/522967#M5603 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by sturzi on Tue Apr 07 00:45:29 MST 2015</STRONG><BR /><SPAN>Hi,</SPAN><BR /><SPAN>I was hoping someone could help me with this issue. While stress testing the mass storage class on an LPC1769 we found an issue for which we don't have an explanation.</SPAN><BR /><BR /><SPAN>Every now and then (in the order of about 15 minutes) when processing the received data the DV (data valid) bit in the USBRxPlen register is not set (PKT_LNGTH and PKT_RDY however are set as expected). In the user manual it states that for non-isochronous transfers no interrupt is generated if the data isn't valid, therefore it is a bit of a mystery why this happens. It only says that an invalid packet can be generated with a bus reset, but since no bus reset happens this can't be the issue.</SPAN><BR /><SPAN>If anyone has more information regarding this issue I'd be very interested to hear it.</SPAN><BR /><BR /><SPAN>Thanks</SPAN></BODY></HTML> Wed, 15 Jun 2016 16:43:12 GMT https://community.nxp.com/t5/LPC-Microcontrollers/LPC1769-Data-valid-flag-is-not-set-for-bulk-transfers/m-p/522967#M5603 lpcware 2016-06-15T16:43:12Z