2 * Author: Thomas Ingleby <thomas.c.ingleby@intel.com>
3 * Copyright (c) 2014 Intel Corporation.
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29 * This file defines the spi interface for libmaa
43 typedef struct _spi* maa_spi_context;
45 /** Initialise SPI_context, uses board mapping. Sets the muxes
47 * @param bus to use, as listed in platform definition. Normally 0
48 * @return maa_spi_context The returned initialised SPI context
50 maa_spi_context maa_spi_init(int bus);
52 /** Set the SPI device mode. see spidev
54 * @param spi the spi device context
55 * @param mode the mode. See Linux spidev
57 * @return maa_spi_context The returned initialised SPI context
59 maa_result_t maa_spi_mode(maa_spi_context dev,unsigned short mode);
61 /** Set the SPI device operating clock frequency.
63 * @param spi the spid device clock frequency
64 * @param hz the frequency in hz
66 * @return maa_spi_context The returned initialised SPI context
68 maa_result_t maa_spi_frequency(maa_spi_context dev, int hz);
70 /** Write Single Byte to the SPI device.
72 * @param spi the spid device clock frequency
75 * @return data received on the miso line.
77 uint8_t maa_spi_write(maa_spi_context dev, uint8_t data);
79 /** Write Buffer of bytes to the SPI device.
81 * @param spi the spid device clock frequency
83 * @param length elements within buffer, Max 4096
85 * @return data received on the miso line. Same length as passed in.
87 uint8_t* maa_spi_write_buf(maa_spi_context dev, uint8_t* data, int length);
91 * @param dev spi context
92 * @param lsb. Use least significant bit transmission. 0 for msbi
94 * @return maa result of operation
97 maa_spi_lsbmode(maa_spi_context dev, maa_boolean_t lsb);
99 /** Set bits per mode on transaction
102 * @param dev spi context
103 * @param bits bits per word
105 * @return Result of operation
108 maa_spi_bit_per_word(maa_spi_context dev, unsigned int bits);
110 /** De-inits an maa_spi_context device
112 * @param dev the spi context
114 * @return maa_result_t the maa result.
116 maa_result_t maa_spi_stop(maa_spi_context dev);