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plx/Plxlibrary/Aardvark.h

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/*=========================================================================
| Aardvark Interface Library
|--------------------------------------------------------------------------
| Copyright (c) 2002-2019 Total Phase, Inc.
| All rights reserved.
| www.totalphase.com
|
| Redistribution and use in source and binary forms, with or without
| modification, are permitted provided that the following conditions
| are met:
|
| - Redistributions of source code must retain the above copyright
| notice, this list of conditions and the following disclaimer.
|
| - Redistributions in binary form must reproduce the above copyright
| notice, this list of conditions and the following disclaimer in the
| documentation and/or other materials provided with the distribution.
|
| - Neither the name of Total Phase, Inc. nor the names of its
| contributors may be used to endorse or promote products derived from
| this software without specific prior written permission.
|
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
| "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
| LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
| FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
| COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
| INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
| BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
| LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
| CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
| LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
| ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
| POSSIBILITY OF SUCH DAMAGE.
|--------------------------------------------------------------------------
| To access Aardvark devices through the API:
|
| 1) Use one of the following shared objects:
| aardvark.so -- Linux shared object
| aardvark.dll -- Windows dynamic link library
|
| 2) Along with one of the following language modules:
| aardvark.c/h -- C/C++ API header file and interface module
| aardvark_py.py -- Python API
| aardvark.bas -- Visual Basic 6 API
| aardvark.cs -- C# .NET source
| aardvark_net.dll -- Compiled .NET binding
========================================================================*/
#ifndef __aardvark_h__
#define __aardvark_h__
#ifdef __cplusplus
extern "C" {
#endif
/*=========================================================================
| TYPEDEFS
========================================================================*/
#ifndef TOTALPHASE_DATA_TYPES
#define TOTALPHASE_DATA_TYPES
#ifndef _MSC_VER
/* C99-compliant compilers (GCC) */
#include <stdint.h>
typedef uint8_t u08;
typedef uint16_t u16;
typedef uint32_t u32;
typedef uint64_t u64;
typedef int8_t s08;
typedef int16_t s16;
typedef int32_t s32;
typedef int64_t s64;
#else
/* Microsoft compilers (Visual C++) */
typedef unsigned __int8 u08;
typedef unsigned __int16 u16;
typedef unsigned __int32 u32;
typedef unsigned __int64 u64;
typedef signed __int8 s08;
typedef signed __int16 s16;
typedef signed __int32 s32;
typedef signed __int64 s64;
#endif /* __MSC_VER */
typedef float f32;
typedef double f64;
#endif /* TOTALPHASE_DATA_TYPES */
/*=========================================================================
| DEBUG
========================================================================*/
/* Set the following macro to '1' for debugging */
#define AA_DEBUG 0
/*=========================================================================
| VERSION
========================================================================*/
#define AA_HEADER_VERSION 0x0528 /* v5.40 */
/*=========================================================================
| STATUS CODES
========================================================================*/
/*
* All API functions return an integer which is the result of the
* transaction, or a status code if negative. The status codes are
* defined as follows:
*/
enum AardvarkStatus {
/* General codes (0 to -99) */
AA_OK = 0,
AA_UNABLE_TO_LOAD_LIBRARY = -1,
AA_UNABLE_TO_LOAD_DRIVER = -2,
AA_UNABLE_TO_LOAD_FUNCTION = -3,
AA_INCOMPATIBLE_LIBRARY = -4,
AA_INCOMPATIBLE_DEVICE = -5,
AA_COMMUNICATION_ERROR = -6,
AA_UNABLE_TO_OPEN = -7,
AA_UNABLE_TO_CLOSE = -8,
AA_INVALID_HANDLE = -9,
AA_CONFIG_ERROR = -10,
/* I2C codes (-100 to -199) */
AA_I2C_NOT_AVAILABLE = -100,
AA_I2C_NOT_ENABLED = -101,
AA_I2C_READ_ERROR = -102,
AA_I2C_WRITE_ERROR = -103,
AA_I2C_SLAVE_BAD_CONFIG = -104,
AA_I2C_SLAVE_READ_ERROR = -105,
AA_I2C_SLAVE_TIMEOUT = -106,
AA_I2C_DROPPED_EXCESS_BYTES = -107,
AA_I2C_BUS_ALREADY_FREE = -108,
/* SPI codes (-200 to -299) */
AA_SPI_NOT_AVAILABLE = -200,
AA_SPI_NOT_ENABLED = -201,
AA_SPI_WRITE_ERROR = -202,
AA_SPI_SLAVE_READ_ERROR = -203,
AA_SPI_SLAVE_TIMEOUT = -204,
AA_SPI_DROPPED_EXCESS_BYTES = -205,
/* GPIO codes (-400 to -499) */
AA_GPIO_NOT_AVAILABLE = -400,
/* I2C bus monitor codes (-500 to -599) */
AA_I2C_MONITOR_NOT_AVAILABLE = -500,
AA_I2C_MONITOR_NOT_ENABLED = -501
};
#ifndef __cplusplus
typedef enum AardvarkStatus AardvarkStatus;
#endif
/*=========================================================================
| GENERAL TYPE DEFINITIONS
========================================================================*/
/* Aardvark handle type definition */
typedef int Aardvark;
/*
* Deprecated type definitions.
*
* These are only for use with legacy code and
* should not be used for new development.
*/
typedef u08 aa_u08;
typedef u16 aa_u16;
typedef u32 aa_u32;
typedef s08 aa_s08;
typedef s16 aa_s16;
typedef s32 aa_s32;
/*
* Aardvark version matrix.
*
* This matrix describes the various version dependencies
* of Aardvark components. It can be used to determine
* which component caused an incompatibility error.
*
* All version numbers are of the format:
* (major << 8) | minor
*
* ex. v1.20 would be encoded as: 0x0114
*/
struct AardvarkVersion {
/* Software, firmware, and hardware versions. */
u16 software;
u16 firmware;
u16 hardware;
/* Firmware requires that software must be >= this version. */
u16 sw_req_by_fw;
/* Software requires that firmware must be >= this version. */
u16 fw_req_by_sw;
/* Software requires that the API interface must be >= this version. */
u16 api_req_by_sw;
};
#ifndef __cplusplus
typedef struct AardvarkVersion AardvarkVersion;
#endif
/*=========================================================================
| GENERAL API
========================================================================*/
/*
* Get a list of ports to which Aardvark devices are attached.
*
* nelem = maximum number of elements to return
* devices = array into which the port numbers are returned
*
* Each element of the array is written with the port number.
* Devices that are in-use are ORed with AA_PORT_NOT_FREE (0x8000).
*
* ex. devices are attached to ports 0, 1, 2
* ports 0 and 2 are available, and port 1 is in-use.
* array => 0x0000, 0x8001, 0x0002
*
* If the array is NULL, it is not filled with any values.
* If there are more devices than the array size, only the
* first nmemb port numbers will be written into the array.
*
* Returns the number of devices found, regardless of the
* array size.
*/
#define AA_PORT_NOT_FREE 0x8000
int aa_find_devices (
int num_devices,
u16 * devices
);
/*
* Get a list of ports to which Aardvark devices are attached.
*
* This function is the same as aa_find_devices() except that
* it returns the unique IDs of each Aardvark device. The IDs
* are guaranteed to be non-zero if valid.
*
* The IDs are the unsigned integer representation of the 10-digit
* serial numbers.
*/
int aa_find_devices_ext (
int num_devices,
u16 * devices,
int num_ids,
u32 * unique_ids
);
/*
* Open the Aardvark port.
*
* The port number is a zero-indexed integer.
*
* The port number is the same as that obtained from the
* aa_find_devices() function above.
*
* Returns an Aardvark handle, which is guaranteed to be
* greater than zero if it is valid.
*
* This function is recommended for use in simple applications
* where extended information is not required. For more complex
* applications, the use of aa_open_ext() is recommended.
*/
Aardvark aa_open (
int port_number
);
/*
* Open the Aardvark port, returning extended information
* in the supplied structure. Behavior is otherwise identical
* to aa_open() above. If 0 is passed as the pointer to the
* structure, this function is exactly equivalent to aa_open().
*
* The structure is zeroed before the open is attempted.
* It is filled with whatever information is available.
*
* For example, if the firmware version is not filled, then
* the device could not be queried for its version number.
*
* This function is recommended for use in complex applications
* where extended information is required. For more simple
* applications, the use of aa_open() is recommended.
*/
struct AardvarkExt {
/* Version matrix */
AardvarkVersion version;
/* Features of this device. */
int features;
};
#ifndef __cplusplus
typedef struct AardvarkExt AardvarkExt;
#endif
Aardvark aa_open_ext (
int port_number,
AardvarkExt * aa_ext
);
/* Close the Aardvark port. */
int aa_close (
Aardvark aardvark
);
/*
* Return the port for this Aardvark handle.
*
* The port number is a zero-indexed integer.
*/
int aa_port (
Aardvark aardvark
);
/*
* Return the device features as a bit-mask of values, or
* an error code if the handle is not valid.
*/
#define AA_FEATURE_SPI 0x00000001
#define AA_FEATURE_I2C 0x00000002
#define AA_FEATURE_GPIO 0x00000008
#define AA_FEATURE_I2C_MONITOR 0x00000010
int aa_features (
Aardvark aardvark
);
/*
* Return the unique ID for this Aardvark adapter.
* IDs are guaranteed to be non-zero if valid.
* The ID is the unsigned integer representation of the
* 10-digit serial number.
*/
u32 aa_unique_id (
Aardvark aardvark
);
/*
* Return the status string for the given status code.
* If the code is not valid or the library function cannot
* be loaded, return a NULL string.
*/
const char * aa_status_string (
int status
);
/*
* Enable logging to a file. The handle must be standard file
* descriptor. In C, a file descriptor can be obtained by using
* the ANSI C function "open" or by using the function "fileno"
* on a FILE* stream. A FILE* stream can be obtained using "fopen"
* or can correspond to the common "stdout" or "stderr" --
* available when including stdlib.h
*/
#define AA_LOG_STDOUT 1
#define AA_LOG_STDERR 2
int aa_log (
Aardvark aardvark,
int level,
int handle
);
/*
* Return the version matrix for the device attached to the
* given handle. If the handle is 0 or invalid, only the
* software and required api versions are set.
*/
int aa_version (
Aardvark aardvark,
AardvarkVersion * version
);
/*
* Configure the device by enabling/disabling I2C, SPI, and
* GPIO functions.
*/
enum AardvarkConfig {
AA_CONFIG_GPIO_ONLY = 0x00,
AA_CONFIG_SPI_GPIO = 0x01,
AA_CONFIG_GPIO_I2C = 0x02,
AA_CONFIG_SPI_I2C = 0x03,
AA_CONFIG_QUERY = 0x80
};
#ifndef __cplusplus
typedef enum AardvarkConfig AardvarkConfig;
#endif
#define AA_CONFIG_SPI_MASK 0x00000001
#define AA_CONFIG_I2C_MASK 0x00000002
int aa_configure (
Aardvark aardvark,
AardvarkConfig config
);
/*
* Configure the target power pins.
* This is only supported on hardware versions >= 2.00
*/
#define AA_TARGET_POWER_NONE 0x00
#define AA_TARGET_POWER_BOTH 0x03
#define AA_TARGET_POWER_QUERY 0x80
int aa_target_power (
Aardvark aardvark,
u08 power_mask
);
/*
* Sleep for the specified number of milliseconds
* Accuracy depends on the operating system scheduler
* Returns the number of milliseconds slept
*/
u32 aa_sleep_ms (
u32 milliseconds
);
/*=========================================================================
| ASYNC MESSAGE POLLING
========================================================================*/
/*
* Polling function to check if there are any asynchronous
* messages pending for processing. The function takes a timeout
* value in units of milliseconds. If the timeout is < 0, the
* function will block until data is received. If the timeout is 0,
* the function will perform a non-blocking check.
*/
#define AA_ASYNC_NO_DATA 0x00000000
#define AA_ASYNC_I2C_READ 0x00000001
#define AA_ASYNC_I2C_WRITE 0x00000002
#define AA_ASYNC_SPI 0x00000004
#define AA_ASYNC_I2C_MONITOR 0x00000008
int aa_async_poll (
Aardvark aardvark,
int timeout
);
/*=========================================================================
| I2C API
========================================================================*/
/* Free the I2C bus. */
int aa_i2c_free_bus (
Aardvark aardvark
);
/*
* Set the I2C bit rate in kilohertz. If a zero is passed as the
* bitrate, the bitrate is unchanged and the current bitrate is
* returned.
*/
int aa_i2c_bitrate (
Aardvark aardvark,
int bitrate_khz
);
/*
* Set the bus lock timeout. If a zero is passed as the timeout,
* the timeout is unchanged and the current timeout is returned.
*/
int aa_i2c_bus_timeout (
Aardvark aardvark,
u16 timeout_ms
);
enum AardvarkI2cFlags {
AA_I2C_NO_FLAGS = 0x00,
AA_I2C_10_BIT_ADDR = 0x01,
AA_I2C_COMBINED_FMT = 0x02,
AA_I2C_NO_STOP = 0x04,
AA_I2C_SIZED_READ = 0x10,
AA_I2C_SIZED_READ_EXTRA1 = 0x20
};
#ifndef __cplusplus
typedef enum AardvarkI2cFlags AardvarkI2cFlags;
#endif
/* Read a stream of bytes from the I2C slave device. */
int aa_i2c_read (
Aardvark aardvark,
u16 slave_addr,
AardvarkI2cFlags flags,
u16 num_bytes,
u08 * data_in
);
enum AardvarkI2cStatus {
AA_I2C_STATUS_OK = 0,
AA_I2C_STATUS_BUS_ERROR = 1,
AA_I2C_STATUS_SLA_ACK = 2,
AA_I2C_STATUS_SLA_NACK = 3,
AA_I2C_STATUS_DATA_NACK = 4,
AA_I2C_STATUS_ARB_LOST = 5,
AA_I2C_STATUS_BUS_LOCKED = 6,
AA_I2C_STATUS_LAST_DATA_ACK = 7
};
#ifndef __cplusplus
typedef enum AardvarkI2cStatus AardvarkI2cStatus;
#endif
/*
* Read a stream of bytes from the I2C slave device.
* This API function returns the number of bytes read into
* the num_read variable. The return value of the function
* is a status code.
*/
int aa_i2c_read_ext (
Aardvark aardvark,
u16 slave_addr,
AardvarkI2cFlags flags,
u16 num_bytes,
u08 * data_in,
u16 * num_read
);
/* Write a stream of bytes to the I2C slave device. */
int aa_i2c_write (
Aardvark aardvark,
u16 slave_addr,
AardvarkI2cFlags flags,
u16 num_bytes,
const u08 * data_out
);
/*
* Write a stream of bytes to the I2C slave device.
* This API function returns the number of bytes written into
* the num_written variable. The return value of the function
* is a status code.
*/
int aa_i2c_write_ext (
Aardvark aardvark,
u16 slave_addr,
AardvarkI2cFlags flags,
u16 num_bytes,
const u08 * data_out,
u16 * num_written
);
/*
* Do an atomic write+read to an I2C slave device by first
* writing a stream of bytes to the I2C slave device and then
* reading a stream of bytes back from the same slave device.
* This API function returns the number of bytes written into
* the num_written variable and the number of bytes read into
* the num_read variable. The return value of the function is
* the status given as (read_status << 8) | (write_status).
*/
int aa_i2c_write_read (
Aardvark aardvark,
u16 slave_addr,
AardvarkI2cFlags flags,
u16 out_num_bytes,
const u08 * out_data,
u16 * num_written,
u16 in_num_bytes,
u08 * in_data,
u16 * num_read
);
/* Enable/Disable the Aardvark as an I2C slave device */
int aa_i2c_slave_enable (
Aardvark aardvark,
u08 addr,
u16 maxTxBytes,
u16 maxRxBytes
);
int aa_i2c_slave_disable (
Aardvark aardvark
);
/*
* Set the slave response in the event the Aardvark is put
* into slave mode and contacted by a Master.
*/
int aa_i2c_slave_set_response (
Aardvark aardvark,
u08 num_bytes,
const u08 * data_out
);
/*
* Return number of bytes written from a previous
* Aardvark->I2C_master transmission. Since the transmission is
* happening asynchronously with respect to the PC host
* software, there could be responses queued up from many
* previous write transactions.
*/
int aa_i2c_slave_write_stats (
Aardvark aardvark
);
/* Read the bytes from an I2C slave reception */
int aa_i2c_slave_read (
Aardvark aardvark,
u08 * addr,
u16 num_bytes,
u08 * data_in
);
/* Extended functions that return status code */
int aa_i2c_slave_write_stats_ext (
Aardvark aardvark,
u16 * num_written
);
int aa_i2c_slave_read_ext (
Aardvark aardvark,
u08 * addr,
u16 num_bytes,
u08 * data_in,
u16 * num_read
);
/*
* Enable the I2C bus monitor
* This disables all other functions on the Aardvark adapter
*/
int aa_i2c_monitor_enable (
Aardvark aardvark
);
/* Disable the I2C bus monitor */
int aa_i2c_monitor_disable (
Aardvark aardvark
);
/* Read the data collected by the bus monitor */
#define AA_I2C_MONITOR_DATA 0x00ff
#define AA_I2C_MONITOR_NACK 0x0100
#define AA_I2C_MONITOR_CMD_START 0xff00
#define AA_I2C_MONITOR_CMD_STOP 0xff01
int aa_i2c_monitor_read (
Aardvark aardvark,
u16 num_bytes,
u16 * data
);
/*
* Configure the I2C pullup resistors.
* This is only supported on hardware versions >= 2.00
*/
#define AA_I2C_PULLUP_NONE 0x00
#define AA_I2C_PULLUP_BOTH 0x03
#define AA_I2C_PULLUP_QUERY 0x80
int aa_i2c_pullup (
Aardvark aardvark,
u08 pullup_mask
);
/*=========================================================================
| SPI API
========================================================================*/
/*
* Set the SPI bit rate in kilohertz. If a zero is passed as the
* bitrate, the bitrate is unchanged and the current bitrate is
* returned.
*/
int aa_spi_bitrate (
Aardvark aardvark,
int bitrate_khz
);
/*
* These configuration parameters specify how to clock the
* bits that are sent and received on the Aardvark SPI
* interface.
*
* The polarity option specifies which transition
* constitutes the leading edge and which transition is the
* falling edge. For example, AA_SPI_POL_RISING_FALLING
* would configure the SPI to idle the SCK clock line low.
* The clock would then transition low-to-high on the
* leading edge and high-to-low on the trailing edge.
*
* The phase option determines whether to sample or setup on
* the leading edge. For example, AA_SPI_PHASE_SAMPLE_SETUP
* would configure the SPI to sample on the leading edge and
* setup on the trailing edge.
*
* The bitorder option is used to indicate whether LSB or
* MSB is shifted first.
*
* See the diagrams in the Aardvark datasheet for
* more details.
*/
enum AardvarkSpiPolarity {
AA_SPI_POL_RISING_FALLING = 0,
AA_SPI_POL_FALLING_RISING = 1
};
#ifndef __cplusplus
typedef enum AardvarkSpiPolarity AardvarkSpiPolarity;
#endif
enum AardvarkSpiPhase {
AA_SPI_PHASE_SAMPLE_SETUP = 0,
AA_SPI_PHASE_SETUP_SAMPLE = 1
};
#ifndef __cplusplus
typedef enum AardvarkSpiPhase AardvarkSpiPhase;
#endif
enum AardvarkSpiBitorder {
AA_SPI_BITORDER_MSB = 0,
AA_SPI_BITORDER_LSB = 1
};
#ifndef __cplusplus
typedef enum AardvarkSpiBitorder AardvarkSpiBitorder;
#endif
/* Configure the SPI master or slave interface */
int aa_spi_configure (
Aardvark aardvark,
AardvarkSpiPolarity polarity,
AardvarkSpiPhase phase,
AardvarkSpiBitorder bitorder
);
/* Write a stream of bytes to the downstream SPI slave device. */
int aa_spi_write (
Aardvark aardvark,
u16 out_num_bytes,
const u08 * data_out,
u16 in_num_bytes,
u08 * data_in
);
/* Enable/Disable the Aardvark as an SPI slave device */
int aa_spi_slave_enable (
Aardvark aardvark
);
int aa_spi_slave_disable (
Aardvark aardvark
);
/*
* Set the slave response in the event the Aardvark is put
* into slave mode and contacted by a Master.
*/
int aa_spi_slave_set_response (
Aardvark aardvark,
u08 num_bytes,
const u08 * data_out
);
/* Read the bytes from an SPI slave reception */
int aa_spi_slave_read (
Aardvark aardvark,
u16 num_bytes,
u08 * data_in
);
/*
* Change the output polarity on the SS line.
*
* Note: When configured as an SPI slave, the Aardvark will
* always be setup with SS as active low. Hence this function
* only affects the SPI master functions on the Aardvark.
*/
enum AardvarkSpiSSPolarity {
AA_SPI_SS_ACTIVE_LOW = 0,
AA_SPI_SS_ACTIVE_HIGH = 1
};
#ifndef __cplusplus
typedef enum AardvarkSpiSSPolarity AardvarkSpiSSPolarity;
#endif
int aa_spi_master_ss_polarity (
Aardvark aardvark,
AardvarkSpiSSPolarity polarity
);
/*=========================================================================
| GPIO API
========================================================================*/
/*
* The following enumerated type maps the named lines on the
* Aardvark I2C/SPI line to bit positions in the GPIO API.
* All GPIO API functions will index these lines through an
* 8-bit masked value. Thus, each bit position in the mask
* can be referred back its corresponding line through the
* enumerated type.
*/
enum AardvarkGpioBits {
AA_GPIO_SCL = 0x01,
AA_GPIO_SDA = 0x02,
AA_GPIO_MISO = 0x04,
AA_GPIO_SCK = 0x08,
AA_GPIO_MOSI = 0x10,
AA_GPIO_SS = 0x20
};
#ifndef __cplusplus
typedef enum AardvarkGpioBits AardvarkGpioBits;
#endif
/*
* Configure the GPIO, specifying the direction of each bit.
*
* A call to this function will not change the value of the pullup
* mask in the Aardvark. This is illustrated by the following
* example:
* (1) Direction mask is first set to 0x00
* (2) Pullup is set to 0x01
* (3) Direction mask is set to 0x01
* (4) Direction mask is later set back to 0x00.
*
* The pullup will be active after (4).
*
* On Aardvark power-up, the default value of the direction
* mask is 0x00.
*/
#define AA_GPIO_DIR_INPUT 0
#define AA_GPIO_DIR_OUTPUT 1
int aa_gpio_direction (
Aardvark aardvark,
u08 direction_mask
);
/*
* Enable an internal pullup on any of the GPIO input lines.
*
* Note: If a line is configured as an output, the pullup bit
* for that line will be ignored, though that pullup bit will
* be cached in case the line is later configured as an input.
*
* By default the pullup mask is 0x00.
*/
#define AA_GPIO_PULLUP_OFF 0
#define AA_GPIO_PULLUP_ON 1
int aa_gpio_pullup (
Aardvark aardvark,
u08 pullup_mask
);
/*
* Read the current digital values on the GPIO input lines.
*
* The bits will be ordered as described by AA_GPIO_BITS. If a
* line is configured as an output, its corresponding bit
* position in the mask will be undefined.
*/
int aa_gpio_get (
Aardvark aardvark
);
/*
* Set the outputs on the GPIO lines.
*
* Note: If a line is configured as an input, it will not be
* affected by this call, but the output value for that line
* will be cached in the event that the line is later
* configured as an output.
*/
int aa_gpio_set (
Aardvark aardvark,
u08 value
);
/*
* Block until there is a change on the GPIO input lines.
* Pins configured as outputs will be ignored.
*
* The function will return either when a change has occurred or
* the timeout expires. The timeout, specified in millisecods, has
* a precision of ~16 ms. The maximum allowable timeout is
* approximately 4 seconds. If the timeout expires, this function
* will return the current state of the GPIO lines.
*
* This function will return immediately with the current value
* of the GPIO lines for the first invocation after any of the
* following functions are called: aa_configure,
* aa_gpio_direction, or aa_gpio_pullup.
*
* If the function aa_gpio_get is called before calling
* aa_gpio_change, aa_gpio_change will only register any changes
* from the value last returned by aa_gpio_get.
*/
int aa_gpio_change (
Aardvark aardvark,
u16 timeout
);
#ifdef __cplusplus
}
#endif
#endif /* __aardvark_h__ */