ESP32-S2: Detect EP IN Xfer Timeout

In some rare ocasions (bad cable, noise, etc.) data transfer might timeout and hang the endpoint, unless the interrupt flag is cleared.
This pull request targets to solve that case.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/portable/espressif/esp32s2/dcd_esp32s2.c b/src/portable/espressif/esp32s2/dcd_esp32s2.c
index d49b69a10..3d30b6016 100644
--- a/src/portable/espressif/esp32s2/dcd_esp32s2.c
+++ b/src/portable/espressif/esp32s2/dcd_esp32s2.c
@@ -637,6 +637,13 @@ static void handle_epin_ints(void)
           USB0.dtknqr4_fifoemptymsk &= ~(1 << n);
         }
       }
+
+      // XFER Timeout
+      if (USB0.in_ep_reg[n].diepint & USB_D_TIMEOUT0_M) {
+        // Clear interrupt or enpoint will hang.
+        USB0.in_ep_reg[n].diepint = USB_D_TIMEOUT0_M;
+        // Maybe retry?
+      }
     }
   }
 }