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Send a ZLP if nothing to transfer and last transfer was EPSIZE

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This commit is contained in:
Martin Thierer 2021-07-20 18:55:00 +02:00
parent d49938d0f5
commit f607a99127
1 changed files with 4 additions and 1 deletions
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5
src/class/vendor/vendor_device.c vendored
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@ -61,6 +61,8 @@ typedef struct
CFG_TUSB_MEM_SECTION static vendord_interface_t _vendord_itf[CFG_TUD_VENDOR];
CFG_TUSB_MEM_SECTION static bool last_in_transfer_was_epsize = false;
#define ITF_MEM_RESET_SIZE offsetof(vendord_interface_t, rx_ff)
@ -112,10 +114,11 @@ static bool maybe_transmit(vendord_interface_t* p_itf)
TU_VERIFY( !usbd_edpt_busy(TUD_OPT_RHPORT, p_itf->ep_in) );
uint16_t count = tu_fifo_read_n(&p_itf->tx_ff, p_itf->epin_buf, CFG_TUD_VENDOR_EPSIZE);
if (count > 0)
if (count > 0 || last_in_transfer_was_epsize)
{
TU_ASSERT( usbd_edpt_xfer(TUD_OPT_RHPORT, p_itf->ep_in, p_itf->epin_buf, count) );
}
last_in_transfer_was_epsize = count && (count == CFG_TUD_VENDOR_EPSIZE);
return true;
}