pci_read_config16()

Read 16-bit values from the configuration space of a device

Synopsis:

#include <hw/pci.h>

int pci_read_config16( unsigned bus,
                       unsigned dev_func,
                       unsigned offset,
                       unsigned count,
                       char* buff );

Arguments:

bus

The bus number.

dev_func

The name of the device or function.

offset

The register offset into the configuration space. This offset must be aligned to a 16-bit boundary (that is 0, 2, 4, …, 254 bytes).

count

The number of 16-bit values to read.

buff

A pointer to a buffer where the requested 16-bit values are placed.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The pci_read_config16() function reads the specified number of 16-bit values from the configuration space of the given device or function.

---

You must successfully call pci_attach() before calling any of the other PCI functions.

---

Returns:

PCI_BAD_REGISTER_NUMBER

An invalid offset register number was given.

PCI_BUFFER_TOO_SMALL

The PCI BIOS server reads only 50 words at a time; count is too large.

PCI_SUCCESS

The device or function was found.

-1

You haven't called pci_attach(), or the call to it failed.

Classification:

QNX Neutrino

See also:

pci_attach(), pci_attach_device(), pci_detach(), pci_detach_device(), pci_find_class(), pci_find_device(), pci_present(), pci_read_config(), pci_read_config8(), pci_read_config32(), pci_rescan_bus(), pci_write_config(), pci_write_config8(), pci_write_config16(), pci_write_config32()