2 * Author: Thomas Ingleby <thomas.c.ingleby@intel.com>
3 * Copyright (c) 2014 Intel Corporation.
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29 * @brief System Packet Interface
31 * This file defines the spi interface for libmaa
33 * @snippet spi_mcp4261.c Interesting
47 * Opaque pointer definition to the internal struct _spi
49 typedef struct _spi* maa_spi_context;
52 * Initialise SPI_context, uses board mapping. Sets the muxes
54 * @param bus Bus to use, as listed in platform definition, normally 0
55 * @return Spi context or NULL
57 maa_spi_context maa_spi_init(int bus);
60 * Set the SPI device mode. see spidev 0-3.
62 * @param dev The Spi context
63 * @param mode The SPI mode, See Linux spidev
64 * @return Spi context or NULL
66 maa_result_t maa_spi_mode(maa_spi_context dev,unsigned short mode);
68 /** Set the SPI device operating clock frequency.
70 * @param dev the Spi context
71 * @param hz the frequency in hz
72 * @return maa_spi_context The returned initialised SPI context
74 maa_result_t maa_spi_frequency(maa_spi_context dev, int hz);
76 /** Write Single Byte to the SPI device.
78 * @param dev The Spi context
79 * @param data Data to send
80 * @return Data received on the miso line
82 uint8_t maa_spi_write(maa_spi_context dev, uint8_t data);
84 /** Write Buffer of bytes to the SPI device. The pointer return has to be
85 * free'd by the caller.
87 * @param dev The Spi context
89 * @param length elements within buffer, Max 4096
90 * @return Data received on the miso line, same length as passed in
92 uint8_t* maa_spi_write_buf(maa_spi_context dev, uint8_t* data, int length);
95 * Change the SPI lsb mode
97 * @param dev The Spi context
98 * @param lsb Use least significant bit transmission. 0 for msbi
99 * @return Result of operation
101 maa_result_t maa_spi_lsbmode(maa_spi_context dev, maa_boolean_t lsb);
104 * Set bits per mode on transaction, defaults at 8
106 * @param dev The Spi context
107 * @param bits bits per word
108 * @return Result of operation
110 maa_result_t maa_spi_bit_per_word(maa_spi_context dev, unsigned int bits);
113 * De-inits an maa_spi_context device
115 * @param dev The Spi context
116 * @return Result of operation
118 maa_result_t maa_spi_stop(maa_spi_context dev);