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Fix STM32H7 multi-descriptor RX segment lengths #1362

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Fix STM32H7 multi-descriptor RX segment lengths #1362

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11 changes: 8 additions & 3 deletions source/portable/NetworkInterface/STM32/Drivers/H7/stm32h7xx_hal_eth.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1101,18 +1101,23 @@
heth->RxDescList.RxDataLength = 0;
}

/* Get the Frame Length of the received packet: substruct 4 bytes of the CRC */
bufflength = READ_BIT( dmarxdesc->DESC3, ETH_DMARXNDESCWBF_PL ) - heth->RxDescList.RxDataLength;

/* Check if last descriptor */
if( READ_BIT( dmarxdesc->DESC3, ETH_DMARXNDESCWBF_LD ) != ( uint32_t ) RESET )
{
/* PL is valid on the last descriptor and contains the total frame length. */
bufflength = READ_BIT( dmarxdesc->DESC3, ETH_DMARXNDESCWBF_PL ) - heth->RxDescList.RxDataLength;

/* Save Last descriptor index */
heth->RxDescList.pRxLastRxDesc = dmarxdesc->DESC3;

/* Packet ready */
rxdataready = 1;
}
else
{
/* PL is not a per-segment length on intermediate descriptors. */
bufflength = heth->Init.RxBuffLen;
}

/* Link data */
#if ( USE_HAL_ETH_REGISTER_CALLBACKS == 1 )
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