Rechercher une page de manuel

Chercher une autre page de manuel:

iic.4freebsd

Langue: en

Autres versions - même langue

Version: 361822 (ubuntu - 24/10/10)

Section: 4 (Pilotes et protocoles réseau)


BSD mandoc

NAME

iic - I2C generic I/O device driver

SYNOPSIS

device iic

In dev/iicbus/iic.h

DESCRIPTION

The device driver provides generic I/O to any iicbus(4) instance. In order to control I2C devices, use /dev/iic? with the following ioctls:
I2CSTART
(Vt struct iiccmd ) Sends the start condition to the slave specified by the slave element to the bus. All other elements are ignored.
I2CRPTSTART
(Vt struct iiccmd ) Sends the repeated start condition to the slave specified by the slave element to the bus. All other elements are ignored.
I2CSTOP
No argument is passed. Sends the stop condition to the bus. This terminates the current transaction.
I2CRSTCARD
(Vt struct iiccmd ) Resets the bus. The argument is completely ignored.
I2CWRITE
(Vt struct iiccmd ) Writes data to the iicbus(4). The bus should already be started. The slave element is ignored. The count element is the number of bytes to write. The last element is a boolean flag. It is non-zero when additional write commands will follow. The buf element is a pointer to the data to write to the bus.
I2CREAD
(Vt struct iiccmd ) Reads data from the iicbus(4). The bus should already be started. The slave element is ignored. The count element is the number of bytes to write. The last element is a boolean flag. It is non-zero when additional write commands will follow. The buf element is a pointer to where to store the data read from the bus. Short reads on the bus produce undefined results.
I2CRDWR
(Vt struct iic_rdwr_data ) Generic read/write interface. Allows for an arbitrary number of commands to be sent to an arbitrary number of devices on the bus. A read transfer is specified if IIC_M_RD is set in flags Otherwise the transfer is a write transfer. The slave element specifies the 7-bit address for the transfer. The len element is the length of the data. The buf element is a buffer for that data. This ioctl is intended to be Linux compatible.

The following data structures are defined in In dev/iicbus/iic.h and referenced above:

 struct iiccmd {
         u_char slave;
         int count;
         int last;
         char *buf;
 };
 
 /* Designed to be compatible with linux's struct i2c_msg */
 struct iic_msg
 {
         uint16_t        slave;
         uint16_t        flags;
 #define IIC_M_RD        0x0001  /* read vs write */
         uint16_t        len;    /* msg legnth */
         uint8_t *       buf;
 };
 
 struct iic_rdwr_data {
         struct iic_msg *msgs;
         uint32_t nmsgs;
 };
 

It is also possible to use read/write routines, then I2C start/stop handshake is managed by the iicbus(4) system. However, the address used for the read/write routines is the one passed to last I2CSTART ioctl(2) to this device.

SEE ALSO

ioctl(2), read(2), write(2), iicbus(4)

HISTORY

The manual page first appeared in Fx 3.0 .

AUTHORS

An -nosplit This manual page was written by An Nicolas Souchu and An M. Warner Losh .

BUGS

Only the I2CRDWR ioctl(2) is thread safe. All other interfaces suffer from some kind of race.
12:41 Je me demandais.... entre les hoax, les FUD, et les trolls, ya des
trucs intéressants sur le net ?
12:46 les images de cul, les warez et les mp3, pourquoi ?