82 lines
2.9 KiB
C
82 lines
2.9 KiB
C
/****************************************************************************
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* include/nuttx/rf/dat-31r5-sp.h
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* Character driver for the Mini-Circuits DAT-31R5-SP+ digital step
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* attenuator.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* 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,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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****************************************************************************/
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#ifndef __INCLUDE_NUTTX_RF_DAT_31R5_SP_H
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#define __INCLUDE_NUTTX_RF_DAT_31R5_SP_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/irq.h>
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#include <nuttx/config.h>
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#include <nuttx/rf/ioctl.h>
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#include <nuttx/spi/spi.h>
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/****************************************************************************
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* Public Function Prototypes
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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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* Name: dat31r5sp_register
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*
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* Description:
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* Register the dat31r5sp character device as 'devpath'. WARNING:
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* the DAT-31R5-SP+ is not spi compatible because it hasn't a proper
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* chip-select input, but it can coexist with other devices on the
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* spi bus assuming that the LE (Latch Enable) is always 0 when the
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* device isn't selected. With LE=0 the internal shift-register will
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* store the last 6 bits sent through the bus, but it will only
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* change the attenuation level when LE=1. This driver sends the
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* attenuation bitstream and gives a small positive pulse to LE.
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*
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* Remember when implementing the corresponding spi select function
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* when selected == true LE should be 1, and when selected == false
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* LE should be 0.
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*
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* Input Parameters:
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* devpath - The full path to the driver to register. E.g., "/dev/att0"
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* spi - An instance of the SPI interface to use to communicate with
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* spidev - Number of the spi device (used to drive the Latch Enable pin).
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*
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno value on failure.
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*
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****************************************************************************/
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int dat31r5sp_register(FAR const char *devpath,
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FAR struct spi_dev_s *spi,
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int spidev);
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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_RF_DAT_31R5_SP_H */
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