127 lines
4.8 KiB
C
127 lines
4.8 KiB
C
/****************************************************************************
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* include/nuttx/net/enc28j60.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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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FAR void *arg);
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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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* Name: 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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* Input 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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