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Comedi

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Description

The function comedi_dio_read() reads the channel channel belonging to the subdevice subdevice of device device.

The data value that is read is stored in the

bit. This function is equivalent to:

comedi_data_read(device, subdevice, channel, 0, 0, bit);

This function does not require a digital subdevice or a subdevice with a maximum data value of 1 to work properly.

If you wish to read multiple digital channels at once, it is more efﬁcient to use comedi_dio_bitfield2() than to call this

function multiple times.

Return value

Return values and errors are the same as comedi_data_read().

5.4.4.5 comedi_dio_write

comedi_dio_write — write single bit to digital channel

Synopsis

#include <comedilib.h>

int comedi_dio_write(comedi_t * device, unsigned int subdevice, unsigned int channel, unsigned int bit);

Description

The function writes the value bit to the channel channel belonging to the subdevice subdevice of device device. This

function is equivalent to:

comedi_data_write(device, subdevice, channel, 0, 0, bit);

This function does not require a digital subdevice or a subdevice with a maximum data value of 1 to work properly.

If you wish to write multiple digital channels at once, it is more efﬁcient to use comedi_dio_bitfield2() than to call this

function multiple times.

Return value

Return values and errors are the same as comedi_data_write().

5.4.5 Error reporting

5.4.5.1 comedi_errno

comedi_errno — number of last Comedilib error

Synopsis

#include <comedilib.h>

int comedi_errno(void);

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Advantech PCI-1736UP Spezifikationen Seite 73