2 * Author: Brendan Le Foll <brendan.le.foll@intel.com>
3 * Author: Thomas Ingleby <thomas.c.ingleby@intel.com>
4 * Copyright © 2014 Intel Corporation
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to
8 * deal in the Software without restriction, including without limitation the
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10 * sell copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
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16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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31 * This file defines the basic shared values for libmraa
42 typedef unsigned int mraa_boolean_t;
45 * Enum representing different possible modes for a pin.
48 MRAA_PIN_VALID = 0, /**< Pin Valid */
49 MRAA_PIN_GPIO = 1, /**< General Purpose IO */
50 MRAA_PIN_PWM = 2, /**< Pulse Width Modulation */
51 MRAA_PIN_FAST_GPIO = 3, /**< Faster GPIO */
52 MRAA_PIN_SPI = 4, /**< SPI */
53 MRAA_PIN_I2C = 5, /**< I2C */
54 MRAA_PIN_AIO = 6 /**< Analog in */
58 * A bitfield representing the capabilities of a pin.
62 mraa_boolean_t valid:1; /**< Is the pin valid at all */
63 mraa_boolean_t gpio:1; /**< Is the pin gpio capable */
64 mraa_boolean_t pwm:1; /**< Is the pin pwm capable */
65 mraa_boolean_t fast_gpio:1; /**< Is the pin fast gpio capable */
66 mraa_boolean_t spi:1; /**< Is the pin spi capable */
67 mraa_boolean_t i2c:1; /**< Is the pin i2c capable */
68 mraa_boolean_t aio:1; /**< Is the pin analog input capable */
70 } mraa_pincapabilities_t;
73 * A Structure representing a multiplexer and the required value
77 unsigned int pin; /**< Raw GPIO pin id */
78 unsigned int value; /**< Raw GPIO value */
83 mraa_boolean_t complex_pin:1;
84 mraa_boolean_t output_en:1;
85 mraa_boolean_t output_en_high:1;
86 mraa_boolean_t pullup_en:1;
87 mraa_boolean_t pullup_en_hiz:1;
88 } mraa_pin_cap_complex_t;
92 unsigned int pinmap; /**< sysfs pin */
93 unsigned int parent_id; /** parent chip id */
94 unsigned int mux_total; /** Numfer of muxes needed for operation of pin */
95 mraa_mux_t mux[6]; /** Array holding information about mux */
96 unsigned int output_enable; /** Output Enable GPIO, for level shifting */
97 unsigned int pullup_enable; /** Pull-Up enable GPIO, inputs */
98 mraa_pin_cap_complex_t complex_cap;
104 char mem_dev[32]; /**< Memory device to use /dev/uio0 etc */
105 unsigned int mem_sz; /** Size of memory to map */
106 unsigned int bit_pos; /** Position of value bit */
107 mraa_pin_t gpio; /** GPio context containing none mmap info */
112 * A Structure representing a physical Pin.
116 char name[8]; /**< Pin's real world name */
117 mraa_pincapabilities_t capabilites; /**< Pin Capabiliites */
118 mraa_pin_t gpio; /**< GPIO structure */
119 mraa_pin_t pwm; /**< PWM structure */
120 mraa_pin_t aio; /**< Anaglog Pin */
121 mraa_mmap_pin_t mmap; /**< GPIO through memory */
122 mraa_pin_t i2c; /**< i2c bus/pin */
123 mraa_pin_t spi; /**< spi bus/pin */
128 * A Structure representing the physical properties of a i2c bus.
132 unsigned int bus_id; /**< ID as exposed in the system */
133 unsigned int scl; /**< i2c SCL */
134 unsigned int sda; /**< i2c SDA */
139 * A Structure representing the physical properties of a spi bus.
143 unsigned int bus_id; /**< The Bus ID as exposed to the system. */
144 unsigned int slave_s; /**< Slave select */
145 mraa_boolean_t three_wire; /**< Is the bus only a three wire system */
146 unsigned int sclk; /**< Serial Clock */
147 unsigned int mosi; /**< Master Out, Slave In. */
148 unsigned int miso; /**< Master In, Slave Out. */
149 unsigned int cs; /**< Chip Select, used when the board is a spi slave */
154 * A Structure representing a platform/board.
158 unsigned int phy_pin_count; /**< The Total IO pins on board */
159 unsigned int gpio_count; /**< GPIO Count */
160 unsigned int aio_count; /**< Analog side Count */
161 unsigned int i2c_bus_count; /**< Usable i2c Count */
162 mraa_i2c_bus_t i2c_bus[6]; /**< Array of i2c */
163 unsigned int def_i2c_bus; /**< Position in array of default i2c bus */
164 unsigned int spi_bus_count; /**< Usable spi Count */
165 mraa_spi_bus_t spi_bus[6]; /**< Array of spi */
166 unsigned int def_spi_bus; /**< Position in array of defult spi bus */
167 unsigned int adc_raw; /**< ADC raw bit value */
168 unsigned int adc_supported; /**< ADC supported bit value */
169 mraa_pininfo_t* pins; /**< Pointer to pin array */
176 * Detects running platform and attempts to use included pinmap
178 * @return Result of operation
181 // this sets a compiler attribute (supported by GCC & clang) to have mraa_init()
182 // be called as a constructor make sure your libc supports this! uclibc needs
183 // to be compiled with UCLIBC_CTOR_DTOR
184 mraa_result_t mraa_init() __attribute__((constructor));
186 mraa_result_t mraa_init();
192 * This is not a strict requirement but useful to test memory leaks and for
193 * people who like super clean code.
198 * Checks if a pin is able to use the passed in mode.
200 * @param pin Physical Pin to be checked.
201 * @param mode the mode to be tested.
202 * @return boolean if the mode is supported, 0=false.
204 mraa_boolean_t mraa_pin_mode_test(int pin, mraa_pinmodes_t mode);
207 * Check the board's bit size when reading the value
209 * @return raw bits being read from kernel module. zero if no ADC
211 unsigned int mraa_adc_raw_bits();
214 * Return value that the raw value should be shifted to. Zero if no ADC
216 * @return return actual bit size the adc value should be understood as.
218 unsigned int mraa_adc_supported_bits();