Modify usbcan for using ringbuffer, refresh kicad schematic & PCB

F0:F030,F042,F072/usbcan_ringbuffer/can.h

@@ -0,0 +1,56 @@
+/*
+ * This file is part of the usbcanrb project.
+ * Copyright 2022 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
+
+#include "hardware.h"
+
+// amount of filter banks in STM32F0
+#define STM32F0FBANKNO      28
+// flood period in milliseconds
+#define FLOOD_PERIOD_MS     5
+
+// incoming message buffer size
+#define CAN_INMESSAGE_SIZE  (8)
+
+// CAN message
+typedef struct{
+    uint8_t data[8];    // up to 8 bytes of data
+    uint8_t length;     // data length
+    uint16_t ID;        // ID of receiver
+} CAN_message;
+
+typedef enum{
+    CAN_STOP,
+    CAN_READY,
+    CAN_BUSY,
+    CAN_OK,
+    CAN_FIFO_OVERRUN
+} CAN_status;
+
+CAN_status CAN_get_status();
+
+void CAN_reinit(uint16_t speed);
+void CAN_setup(uint16_t speed);
+
+CAN_status can_send(uint8_t *msg, uint8_t len, uint16_t target_id);
+void can_proc();
+
+CAN_message *CAN_messagebuf_pop();
+
+void set_flood(CAN_message *msg);