seems like it works, the rest is only CDC and composite; and then test on 072 and 303

F1:F103/USB_New_concept/USB_NEW_concept_HID/ringbuffer.h

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#if defined STM32F0
+#include <stm32f0.h>
+#elif defined STM32F1
+#include <stm32f1.h>
+#elif defined STM32F3
+#include <stm32f3.h>
+#endif
+
+typedef struct{
+    uint8_t *data;      // data buffer
+    const int length;   // its length
+    int head;           // head index
+    int tail;           // tail index
+    volatile int busy; // == TRUE if buffer is busy now
+} ringbuffer;
+
+int RB_read(ringbuffer *b, uint8_t *s, int len);
+int RB_readto(ringbuffer *b, uint8_t byte, uint8_t *s, int len);
+int RB_hasbyte(ringbuffer *b, uint8_t byte);
+int RB_write(ringbuffer *b, const uint8_t *str, int l);
+int RB_datalen(ringbuffer *b);
+int RB_clearbuf(ringbuffer *b);