122 lines
3.3 KiB
C
122 lines
3.3 KiB
C
/*
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* Author: Thomas Ingleby <thomas.c.ingleby@intel.com>
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* Copyright (c) 2014 Intel Corporation.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#pragma once
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/**
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* @file
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* @brief System Packet Interface
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*
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* This file defines the spi interface for libmaa
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*
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* @snippet spi_mcp4261.c Interesting
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdio.h>
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#include <fcntl.h>
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#include <stdint.h>
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#include "maa.h"
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/**
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* Opaque pointer definition to the internal struct _spi
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*/
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typedef struct _spi* maa_spi_context;
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/**
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* Initialise SPI_context, uses board mapping. Sets the muxes
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*
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* @param bus Bus to use, as listed in platform definition, normally 0
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* @return Spi context or NULL
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*/
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maa_spi_context maa_spi_init(int bus);
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/**
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* Set the SPI device mode. see spidev 0-3.
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*
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* @param dev The Spi context
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* @param mode The SPI mode, See Linux spidev
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* @return Spi context or NULL
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*/
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maa_result_t maa_spi_mode(maa_spi_context dev,unsigned short mode);
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/** Set the SPI device operating clock frequency.
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*
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* @param dev the Spi context
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* @param hz the frequency in hz
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* @return maa_spi_context The returned initialised SPI context
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*/
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maa_result_t maa_spi_frequency(maa_spi_context dev, int hz);
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/** Write Single Byte to the SPI device.
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*
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* @param dev The Spi context
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* @param data Data to send
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* @return Data received on the miso line
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*/
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uint8_t maa_spi_write(maa_spi_context dev, uint8_t data);
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/** Write Buffer of bytes to the SPI device.
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*
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* @param dev The Spi context
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* @param data to send
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* @param length elements within buffer, Max 4096
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* @return Data received on the miso line, same length as passed in
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*/
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uint8_t* maa_spi_write_buf(maa_spi_context dev, uint8_t* data, int length);
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/**
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* Change the SPI lsb mode
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*
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* @param dev The Spi context
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* @param lsb Use least significant bit transmission. 0 for msbi
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* @return Result of operation
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*/
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maa_result_t maa_spi_lsbmode(maa_spi_context dev, maa_boolean_t lsb);
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/**
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* Set bits per mode on transaction, defaults at 8
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*
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* @param dev The Spi context
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* @param bits bits per word
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* @return Result of operation
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*/
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maa_result_t maa_spi_bit_per_word(maa_spi_context dev, unsigned int bits);
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/**
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* De-inits an maa_spi_context device
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*
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* @param dev The Spi context
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* @return Result of operation
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*/
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maa_result_t maa_spi_stop(maa_spi_context dev);
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#ifdef __cplusplus
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}
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#endif
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