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

Safety:
Cancellation point Yes
Interrupt handler No
Signal handler Yes
Thread Yes

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