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added comment for hw clearing TXFE

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hathach 2020-04-27 13:17:47 +07:00
parent e785b09118
commit 958b5510cb
1 changed files with 4 additions and 1 deletions
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5
src/portable/st/synopsys/dcd_synopsys.c
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@ -679,7 +679,10 @@ static void handle_epin_ints(USB_OTG_DeviceTypeDef * dev, USB_OTG_INEndpointType
// XFER FIFO empty
if ( in_ep[n].DIEPINT & USB_OTG_DIEPINT_TXFE )
{
// DIEPINT's TXFE bit is read-only -> no need to clear
// DIEPINT's TXFE bit is read-only, software cannot clear it.
// It will only be cleared by hardware when written bytes is more than
// - 64 bytes or
// - Half of TX FIFO size (configured by DIEPTXF)
transmit_packet(xfer, &in_ep[n], n);