diff --git a/lib/tinyusb b/lib/tinyusb
index d10b65ada4be7..5217cee5de4cd 160000
--- a/lib/tinyusb
+++ b/lib/tinyusb
@@ -1 +1 @@
-Subproject commit d10b65ada4be7d5754b3128e80a9b4db72bdb23f
+Subproject commit 5217cee5de4cd555018da90f9f1bcc87fb1c1d3a
diff --git a/shared/tinyusb/mp_usbd.h b/shared/tinyusb/mp_usbd.h
index 31234566b6ca4..5c8f2a6095f30 100644
--- a/shared/tinyusb/mp_usbd.h
+++ b/shared/tinyusb/mp_usbd.h
@@ -40,6 +40,13 @@
#include "device/dcd.h"
#endif
+// Initialise TinyUSB device.
+static inline void mp_usbd_init_tud(void) {
+ tusb_init();
+ tud_cdc_configure_fifo_t cfg = { .rx_persistent = 0, .tx_persistent = 1 };
+ tud_cdc_configure_fifo(&cfg);
+}
+
// Run the TinyUSB device task
void mp_usbd_task(void);
@@ -125,7 +132,8 @@ inline static bool mp_usb_device_builtin_enabled(const mp_obj_usb_device_t *usbd
static inline void mp_usbd_init(void) {
// Without runtime USB support, this can be a thin wrapper wrapper around tusb_init()
- tusb_init();
+ // which is called in the below helper function.
+ mp_usbd_init_tud();
}
#endif
diff --git a/shared/tinyusb/mp_usbd_runtime.c b/shared/tinyusb/mp_usbd_runtime.c
index 49553825776a7..a1eebeebd2fcd 100644
--- a/shared/tinyusb/mp_usbd_runtime.c
+++ b/shared/tinyusb/mp_usbd_runtime.c
@@ -428,8 +428,10 @@ void mp_usbd_init(void) {
}
if (need_usb) {
- tusb_init(); // Safe to call redundantly
- tud_connect(); // Reconnect if mp_usbd_deinit() has disconnected
+ // The following will call tusb_init(), which is safe to call redundantly.
+ mp_usbd_init_tud();
+ // Reconnect if mp_usbd_deinit() has disconnected.
+ tud_connect();
}
}
diff --git a/shared/tinyusb/tusb_config.h b/shared/tinyusb/tusb_config.h
index d0c9f89ec600c..0cc5ef03985ef 100644
--- a/shared/tinyusb/tusb_config.h
+++ b/shared/tinyusb/tusb_config.h
@@ -83,7 +83,6 @@
#ifndef CFG_TUD_CDC_TX_BUFSIZE
#define CFG_TUD_CDC_TX_BUFSIZE ((CFG_TUD_MAX_SPEED == OPT_MODE_HIGH_SPEED) ? 512 : 256)
#endif
-#define CFG_TUD_CDC_PERSISTENT_TX_BUFF (1)
#endif
// MSC Configuration
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