1 files changed, 21 insertions, 14 deletions
diff --git a/ports/stm32/usbd_hid_interface.h b/ports/stm32/usbd_hid_interface.h
index b2ff75fa13..3dc87de6bf 100644
--- a/ports/stm32/usbd_hid_interface.h
+++ b/ports/stm32/usbd_hid_interface.h
@@ -1,14 +1,21 @@
-/*
- * This file is part of the MicroPython project, http://micropython.org/
- */
-#ifndef MICROPY_INCLUDED_STMHAL_USBD_HID_INTERFACE_H
-#define MICROPY_INCLUDED_STMHAL_USBD_HID_INTERFACE_H
-
-#include "usbd_cdc_msc_hid.h"
-
-extern const USBD_HID_ItfTypeDef USBD_HID_fops;
-
-int USBD_HID_RxNum(void);
-int USBD_HID_Rx(USBD_HandleTypeDef *pdev, uint8_t *buf, uint32_t len, uint32_t timeout);
-
-#endif // MICROPY_INCLUDED_STMHAL_USBD_HID_INTERFACE_H
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ */
+#ifndef MICROPY_INCLUDED_STMHAL_USBD_HID_INTERFACE_H
+#define MICROPY_INCLUDED_STMHAL_USBD_HID_INTERFACE_H
+
+#include "usbd_cdc_msc_hid.h"
+
+typedef struct _usbd_hid_itf_t {
+    USBD_HandleTypeDef *usb; // the parent USB device
+
+    uint8_t buffer[2][HID_DATA_FS_MAX_PACKET_SIZE]; // pair of buffers to read individual packets into
+    int8_t current_read_buffer; // which buffer to read from
+    uint32_t last_read_len; // length of last read
+    int8_t current_write_buffer; // which buffer to write to
+} usbd_hid_itf_t;
+
+int usbd_hid_rx_num(usbd_hid_itf_t *hid);
+int usbd_hid_rx(usbd_hid_itf_t *hid, size_t len, uint8_t *buf, uint32_t timeout);
+
+#endif // MICROPY_INCLUDED_STMHAL_USBD_HID_INTERFACE_H