mcp2515_buffer.c
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1 // ----------------------------------------------------------------------------
2 /*
3  * Copyright (c) 2007 Fabian Greif, Roboterclub Aachen e.V.
4  * All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  * notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  * notice, this list of conditions and the following disclaimer in the
13  * documentation and/or other materials provided with the distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18  * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25  * SUCH DAMAGE.
26  *
27  * $Id: mcp2515_buffer.c 6653 2008-09-02 13:51:25Z fabian $
28  */
29 // ----------------------------------------------------------------------------
30 
31 #include "mcp2515_private.h"
32 #ifdef SUPPORT_FOR_MCP2515__
33 
34 // ----------------------------------------------------------------------------
35 // check if there are any new messages waiting
36 
37 bool mcp2515_check_message(void)
38 {
39  #if defined(MCP2515_INT)
40  return ((!IS_SET(MCP2515_INT)) ? true : false);
41  #else
42  #ifdef RXnBF_FUNKTION
43  if (!IS_SET(MCP2515_RX0BF) || !IS_SET(MCP2515_RX1BF))
44  return true;
45  else
46  return false;
47  #else
48  return ((mcp2515_read_status(SPI_RX_STATUS) & 0xC0) ? true : false);
49  #endif
50  #endif
51 }
52 
53 // ----------------------------------------------------------------------------
54 // check if there is a free buffer to send messages
55 
56 bool mcp2515_check_free_buffer(void)
57 {
58  uint8_t status = mcp2515_read_status(SPI_READ_STATUS);
59 
60  if ((status & 0x54) == 0x54)
61  return false; // all buffers used
62  else
63  return true;
64 }
65 
66 #endif // SUPPORT_FOR_MCP2515__
uavcan::uint8_t
std::uint8_t uint8_t
Definition: std.hpp:24
SPI_RX_STATUS
#define SPI_RX_STATUS
Definition: mcp2515_defs.h:43
MCP2515_INT
#define MCP2515_INT
Definition: src/config.h:49
mcp2515_private.h
SPI_READ_STATUS
#define SPI_READ_STATUS
Definition: mcp2515_defs.h:42
IS_SET
#define IS_SET(x)
Definition: utils.h:234

uavcan_communicator
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autogenerated on Wed Jan 11 2023 03:59:39