123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899 |
- /****************************************************************************
- * include/nuttx/rf/dat-31r5-sp.h
- * Character driver for the Mini-Circuits DAT-31R5-SP+ digital step
- * attenuator.
- *
- * Copyright (C) 2019, Augusto Fraga Giachero. All rights reserved.
- * Author: Augusto Fraga Giachero <afg@augustofg.net>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- * 3. Neither the name NuttX nor the names of its contributors may be
- * used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- ****************************************************************************/
- #ifndef __INCLUDE_NUTTX_RF_DAT_31R5_SP_H_
- #define __INCLUDE_NUTTX_RF_DAT_31R5_SP_H_
- /****************************************************************************
- * Included Files
- ****************************************************************************/
- #include <nuttx/irq.h>
- #include <nuttx/config.h>
- #include <nuttx/rf/ioctl.h>
- #include <nuttx/spi/spi.h>
- /****************************************************************************
- * Public Function Prototypes
- ****************************************************************************/
- #ifdef __cplusplus
- #define EXTERN extern "C"
- extern "C"
- {
- #else
- #define EXTERN extern
- #endif
- /****************************************************************************
- * Name: dat31r5sp_register
- *
- * Description:
- * Register the dat31r5sp character device as 'devpath'. WARNING:
- * the DAT-31R5-SP+ is not spi compatible because it hasn't a proper
- * chip-select input, but it can coexist with other devices on the
- * spi bus assuming that the LE (Latch Enable) is always 0 when the
- * device isn't selected. With LE=0 the internal shift-register will
- * store the last 6 bits sent through the bus, but it will only
- * change the attenuation level when LE=1. This driver sends the
- * attenuation bitstream and gives a small positive pulse to LE.
- *
- * Remember when implementing the corresponding spi select function
- * when selected == true LE should be 1, and when selected == false
- * LE should be 0.
- *
- * Input Parameters:
- * devpath - The full path to the driver to register. E.g., "/dev/att0"
- * spi - An instance of the SPI interface to use to communicate with
- * spidev - Number of the spi device (used to drive the Latch Enable pin).
- *
- *
- * Returned Value:
- * Zero (OK) on success; a negated errno value on failure.
- *
- ****************************************************************************/
- int dat31r5sp_register(FAR const char *devpath,
- FAR struct spi_dev_s *spi,
- int spidev);
- #undef EXTERN
- #ifdef __cplusplus
- }
- #endif
- #endif /* __INCLUDE_NUTTX_RF_DAT_31R5_SP_H_ */
|