diff options
| -rw-r--r-- | src/portable/nordic/nrf5x/dcd_nrf5x.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/src/portable/nordic/nrf5x/dcd_nrf5x.c b/src/portable/nordic/nrf5x/dcd_nrf5x.c index 5170e0645..5c5f8ba8d 100644 --- a/src/portable/nordic/nrf5x/dcd_nrf5x.c +++ b/src/portable/nordic/nrf5x/dcd_nrf5x.c @@ -805,7 +805,10 @@ void dcd_int_handler(uint8_t rhport) { if (tu_bit_test(data_status, 16 + epnum) || (epnum == 0 && is_control_out)) { xfer_td_t* xfer = get_td(epnum, TUSB_DIR_OUT); - if (xfer->started && xfer->actual_len < xfer->total_len) { + // total_len == 0: an armed zero-length read (e.g. MTP's terminating ZLP) still + // needs the 0-byte DMA to drain the endpoint and complete the transfer; + // actual_len < total_len can never be true for it. + if (xfer->started && (xfer->total_len == 0 || xfer->actual_len < xfer->total_len)) { xact_out_dma(epnum); } else { // Data overflow !!! Nah, nRF will auto accept next Bulk/Interrupt OUT packet |