initio.h File Reference

API Description

initio allows for string initialization of mraa resources.

Go to the source code of this file.

Data Structures
struct	_mraa_io_descriptor

Functions
mraa_result_t	mraa_io_init (const char *strdesc, mraa_io_descriptor **desc)
mraa_result_t	mraa_io_close (mraa_io_descriptor *desc)

Typedefs
typedef struct _mraa_io_descriptor	mraa_io_descriptor

Function Documentation

mraa_result_t mraa_io_init	(	const char *	strdesc,
		mraa_io_descriptor **	desc
	)

Initialize a structure of MRAA context elements given a description string.

Parameters

strdesc

of one or more MRAA IO io:io_ndx[:option_0:option_1:option_2:option_n][,io:io_ndx]

AIO AIO_KEY:aio pin[:num_bits]

examples: a:13 # aio 13 a:13:10 # aio 13, 10 bits

GPIO GPIO_KEY:gpio pin[:dir:value:mode:edge:input:driver]

examples: g:13:input # gpio 13, input g:13:0:output # gpio 13, value 0, output

I2C I2C_KEY:i2c bus[:address:mode]

examples: i:1:std # i2c bus 1, STD speed (100 KHz) i:1:16 # i2c bus 1, address 16 i:0x1:0x10 # i2c bus 1, address 16

IIO IIO_KEY:iio device

examples: ii:1 # iio device 1 ii:0x1 # iio device 1

PWM PWM_KEY:pwm pin

examples: p:1 # pwm pin 1 p:0x1 # pwm pin 1

SPI SPI_KEY:spi bus[:mode:frequency]

examples: s:1 # spi bus 1 s:0x1:mode2:400000 # spi bus 1, mode2 (CPOL = 1, CPHA = 0), 400 KHz

UART UART_KEY:uart ndx[:baud:mode]

examples: u:1 # uart bus 1 u:0x1:9600:8N1 # uart bus 1, 9600 baud, 8 bit byte, no parity, 1 stop bit

UART_OW UART_OW_KEY:uart_ow ndx

examples: ow:1 # uart_ow bus 1 ow:0x1 # uart_ow bus 1

Parameters

desc	Pointer to structure containing number/pointer collections for initialized IO.

Returns

Result of operation

mraa_result_t mraa_io_close

(

mraa_io_descriptor *

desc

)

Free and close resources used by mraa_io_descriptor structure.

Parameters

desc	mraa_io_descriptor structure

Returns

Result of operation

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