141 lines
5.6 KiB
C
141 lines
5.6 KiB
C
/****************************************************************************
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* include/nuttx/net/enc28j60.h
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*
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* Copyright (C) 2010, 2012, 2015 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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#ifndef __INCLUDE_NUTTX_NET_ENC28J60_H
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#define __INCLUDE_NUTTX_NET_ENC28J60_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <stdint.h>
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#include <stdbool.h>
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#include <nuttx/irq.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* ENC28J60 Configuration Settings:
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*
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* CONFIG_ENC28J60 - Enabled ENC28J60 support
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* CONFIG_ENC28J60_SPIMODE - Controls the SPI mode
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* CONFIG_ENC28J60_FREQUENCY - Define to use a different bus frequency
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* CONFIG_ENC28J60_NINTERFACES - Specifies the number of physical ENC28J60
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* devices that will be supported.
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* CONFIG_ENC28J60_HALFDUPPLEX - Default is full duplex
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*/
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/* The ENC28J60 normal provides interrupts to the MCU via a GPIO pin. The
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* following structure provides an MCU-independent mechanixm for controlling
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* the ENC28J60 GPIO interrupt.
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*
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* The ENC32J60 interrupt is an active low, *level* interrupt. "When an
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* interrupt occurs, the interrupt flag is set. If the interrupt is enabled
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* in the EIE register and the INTIE global interrupt enable bit is set, the
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* INT pin will be driven low"
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*
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* "When an enabled interrupt occurs, the interrupt pin will remain low until
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* all flags which are causing the interrupt are cleared or masked off
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* (enable bit is cleared) by the host controller." However, the interrupt
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* will behave like a falling edge interrupt because "After an interrupt
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* occurs, the host controller [clears] the global enable bit for the
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* interrupt pin before servicing the interrupt. Clearing the enable bit
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* will cause the interrupt pin to return to the non-asserted state (high).
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* Doing so will prevent the host controller from missing a falling edge
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* should another interrupt occur while the immediate interrupt is being
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* serviced."
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*/
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struct enc_lower_s
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{
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int (*attach)(FAR const struct enc_lower_s *lower, xcpt_t handler);
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void (*enable)(FAR const struct enc_lower_s *lower);
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void (*disable)(FAR const struct enc_lower_s *lower);
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};
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Function: enc_initialize
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*
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* Description:
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* Initialize the Ethernet driver. The ENC28J60 device is assumed to be
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* in the post-reset state upon entry to this function.
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*
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* Parameters:
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* spi - A reference to the platform's SPI driver for the ENC28J60
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* lower - The MCU-specific interrupt used to control low-level MCU
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* functions (i.e., ENC28J60 GPIO interrupts).
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* devno - If more than one ENC28J60 is supported, then this is the
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* zero based number that identifies the ENC28J60;
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*
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* Returned Value:
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* OK on success; Negated errno on failure.
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*
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* Assumptions:
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*
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****************************************************************************/
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struct spi_dev_s; /* see nuttx/spi/spi.h */
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int enc_initialize(FAR struct spi_dev_s *spi,
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FAR const struct enc_lower_s *lower, unsigned int devno);
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* __INCLUDE_NUTTX_NET_ENC28J60_H */
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