gf_i2c_read()

Perform an I2C master-read transaction

Synopsis:

#include <gf/gf.h>

int gf_i2c_read ( gf_dev_t      gdev,
                  int           busno,
                  int           slaveaddr,
                  uint8_t *     idata,
                  int           ibytes );

Arguments:

gdev: The handle for the graphics device to peform the transaction on. This is the handle acquired by gf_dev_attach().
busno: Index of the I2C bus, on which this device is capable of being a master.
slaveaddr: The address of the I2C slave device.
idata: A pointer to a buffer where the function can store the incoming data.
ibytes: The number of bytes to read. The maximum is 128 bytes.

Library:

gf

Description:

This function performs an I2C master-read transaction.

Threads should not call this function between calls to gf_draw_begin() and gf_draw_end(), or a deadlock will occur.

Returns:

GF_ERR_OK: Success.
GF_ERR_PARM: The busno index is out of range for the specified device.
GF_ERR_IODISPLAY: Error communicating with io-display. Check to ensure that io-display is still running. The sloginfo utility may provide more information.
GF_ERR_IO: Hardware error reading from the slave device. The sloginfo utility may provide more information.
GF_ERR_TOOBIG: The number of bytes requested to be read (ibytes) is larger than the maximum of 128.

Classification:

QNX Graphics Framework

Safety:
Interrupt handler	No
Signal handler	No
Thread	Yes