impl(mcp2515) register primitives

can.h

@@ -0,0 +1,67 @@
+/*
+ * MIT License
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * Copyright (c) 2013 Seeed Technology Inc. Copyright (c) 2016 Dmitry
+ * (C) Author: iomonad <[email protected]>
+ */
+
+#ifndef __CAN_H__
+#define __CAN_H__
+
+typedef unsigned char  __u8;
+typedef unsigned short __u16;
+typedef unsigned long  __u32;
+
+/* special address description flags for the CAN_ID */
+#define CAN_EFF_FLAG 0x80000000UL /* EFF/SFF is set in the MSB */
+#define CAN_RTR_FLAG 0x40000000UL /* remote transmission request */
+#define CAN_ERR_FLAG 0x20000000UL /* error message frame */
+
+/* valid bits in CAN ID for frame formats */
+#define CAN_SFF_MASK 0x000007FFUL /* standard frame format (SFF) */
+#define CAN_EFF_MASK 0x1FFFFFFFUL /* extended frame format (EFF) */
+#define CAN_ERR_MASK 0x1FFFFFFFUL /* omit EFF, RTR, ERR flags */
+
+/*
+ * Controller Area Network Identifier structure
+ *
+ * bit 0-28 : CAN identifier (11/29 bit)
+ * bit 29   : error message frame flag (0 = data frame, 1 = error message)
+ * bit 30   : remote transmission request flag (1 = rtr frame)
+ * bit 31   : frame format flag (0 = standard 11 bit, 1 = extended 29 bit)
+ */
+typedef __u32 canid_t;
+
+#define CAN_SFF_ID_BITS     11
+#define CAN_EFF_ID_BITS     29
+
+/* CAN payload length and DLC definitions according to ISO 11898-1 */
+#define CAN_MAX_DLC 8
+#define CAN_MAX_DLEN 8
+
+struct can_frame {
+  canid_t can_id;  /* 32 bit CAN_ID + EFF/RTR/ERR flags */
+  __u8    can_dlc; /* frame payload length in byte (0 .. CAN_MAX_DLEN) */
+  __u8    data[CAN_MAX_DLEN] __attribute__((aligned(8)));
+};
+
+
+#endif // __CAN_H__

mcp2515.c

@@ -19,6 +19,7 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  *
+ * Copyright (c) 2013 Seeed Technology Inc. Copyright (c) 2016 Dmitry
  * (C) Author: iomonad <[email protected]>
  */