Data lost using GPIF

	csie0916 posted on 16 Mar 2010 7:47 PM PST Member 3 Forum Posts

Host transfers 8k data to peripheral through FX2LP. However, the last 4k data is lost (what is root cause of data lost?). FX2LP is configured as auto out mode and roughly setting is shown as following:

TD_Init () :
CPUCS = ((CPUCS & ~bmCLKSPD) | bmCLKSPD1); // set the CPU clock to 48MHz

EP2CFG = 0xA0; // EP2OUT, bulk, size 512, 4x buffered
EP4CFG = 0x00; // not valid
EP6CFG = 0x00; // not valid
EP8CFG = 0x00; // not valid

EP2FIFOCFG = 0x00; // allow core to see zero to one transition of auto out bit
EP2FIFOCFG = 0x10; // auto out mode, disable PKTEND zero length send, word ops

TD_Poll():
if( GPIFTRIG & 0x80 ) // if GPIF interface IDLE
if ( ! ( EP24FIFOFLGS & 0x02 ) ) // if there's a packet in the FIFO domain for EP2
{
if ( ext device not full )
{
SYNCDELAY;
GPIFTCB1 = 0x02;
SYNCDELAY;
GPIFTCB0 = 0x00;
SYNCDELAY;

GPIFTRIG = GPIF_EP2; // launch GPIF FIFO WRITE
SYNCDELAY;

while( !( GPIFTRIG & 0x80 ) ) // poll GPIF Done bit
{
;
}
SYNCDELAY;
}
}
}

ALL CONTENT AND MATERIALS ON THIS SITE ARE PROVIDED "AS IS". CYPRESS SEMICONDUCTOR AND ITS RESPECTIVE SUPPLIERS MAKE NO REPRESENTATIONS ABOUT THE SUITABILITY OF THESE MATERIALS FOR ANY PURPOSE AND DISCLAIM ALL WARRANTIES AND CONDITIONS WITH REGARD TO THESE MATERIALS, INCLUDING BUT NOT LIMITED TO, ALL IMPLIED WARRANTIES AND CONDITIONS OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT OF ANY THIRD PARTY INTELLECTUAL PROPERTY RIGHT. NO LICENSE, EITHER EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, IS GRANTED BY CYPRESS SEMICONDUCTOR. USE OF THE INFORMATION ON THIS SITE MAY REQUIRE A LICENSE FROM A THIRD PARTY, OR A LICENSE FROM CYPRESS SEMICONDUCTOR.

Content on this site may contain or be subject to specific guidelines or limitations on use. All postings and use of the content on this site are subject to the Terms and Conditions of the site; third parties using this content agree to abide by any limitations or guidelines and to comply with the Terms and Conditions of this site. Cypress Semiconductor and its suppliers reserve the right to make corrections, deletions, modifications, enhancements, improvements and other changes to the content and materials, its products, programs and services at any time or to move or discontinue any content, products, programs, or services without notice.

Cypress Perform

Data lost using GPIF