forked from Archive/PX4-Autopilot
LPC1766-STK CAN board support
git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@4254 7fd9a85b-ad96-42d3-883c-3090e2eb8679
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/************************************************************************************
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* configs/solimex-lpc1766stk/src/up_can.c
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* arch/arm/src/board/up_can.c
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*
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* Copyright (C) 2012 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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************************************************************************************/
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/************************************************************************************
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* Included Files
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************************************************************************************/
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#include <nuttx/config.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/can.h>
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#include <arch/board/board.h>
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#include "chip.h"
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#include "up_arch.h"
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#include "lpc17_internal.h"
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#include "lpc17_can.h"
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#include "lpc1766stk_internal.h"
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#if defined(CONFIG_CAN) && (defined(CONFIG_LPC17_CAN1) || defined(CONFIG_LPC17_CAN2))
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/************************************************************************************
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* Pre-processor Definitions
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************************************************************************************/
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/* Configuration ********************************************************************/
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#if defined(CONFIG_LPC17_CAN1) && defined(CONFIG_LPC17_CAN2)
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# warning "Both CAN1 and CAN2 are enabled. Assuming only CAN1."
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# undef CONFIG_LPC17_CAN2
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#endif
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#ifdef CONFIG_LPC17_CAN2
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# warning "CAN2 is not connected on the LPC1766-STK"
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#endif
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#ifdef CONFIG_LPC17_CAN1
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# define CAN_PORT 1
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#else
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# define CAN_PORT 2
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#endif
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/* Debug ***************************************************************************/
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/* Non-standard debug that may be enabled just for testing CAN */
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#ifdef CONFIG_DEBUG_CAN
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# define candbg dbg
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# define canvdbg vdbg
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# define canlldbg lldbg
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# define canllvdbg llvdbg
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#else
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# define candbg(x...)
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# define canvdbg(x...)
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# define canlldbg(x...)
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# define canllvdbg(x...)
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#endif
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/************************************************************************************
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* Private Functions
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************************************************************************************/
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/************************************************************************************
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* Public Functions
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************************************************************************************/
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/************************************************************************************
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* Name: can_devinit
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*
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* Description:
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* All LPC17 architectures must provide the following interface to work with
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* examples/can.
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*
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************************************************************************************/
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int can_devinit(void)
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{
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static bool initialized = false;
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struct can_dev_s *can;
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int ret;
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/* Check if we have already initialized */
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if (!initialized)
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{
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/* Call lpc17_caninitialize() to get an instance of the CAN interface */
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can = lpc17_caninitialize(CAN_PORT);
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if (can == NULL)
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{
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candbg("ERROR: Failed to get CAN interface\n");
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return -ENODEV;
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}
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/* Register the CAN driver at "/dev/can0" */
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ret = can_register("/dev/can0", can);
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if (ret < 0)
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{
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candbg("ERROR: can_register failed: %d\n", ret);
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return ret;
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}
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/* Now we are initialized */
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initialized = true;
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}
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return OK;
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}
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#endif /* CONFIG_CAN && (CONFIG_LPC17_CAN1 || CONFIG_LPC17_CAN2) */
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