bsproxy/proxdev_i2c.c File Reference

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Detailed Description

I2C proxied device operations.

Version:

$LastChangedDate$ $Rev$

All operations are multi-threaded protected by a mutual exclusion.

Author:

Robin Knight (robin.knight@roadnarrows.com)

Copyright:

(C) 2007. RoadNarrows LLC. (http://www.roadnarrows.com)
All Rights Reserved

Definition in file proxdev_i2c.c.

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "rnr/rnrconfig.h"
#include "rnr/log.h"
#include "i2ccom.h"
#include "bsproxy.h"

Go to the source code of this file.

Defines
#define	I2C_DEV_NAME_DFT   "/dev/i2c-0"
	default I2C device
Functions
static int	cb_i2c_scan (i2c_t *pI2C, i2c_dev_t addr, void *context)
	Scanned device callback.
int	ProxDevI2CScan (BsProxyDev_T *pProxDev, byte_t bufScan[], size_t sizeBuf)
	Scan I2C Bus for attached address.
int	ProxDevI2CTrans (BsProxyDev_T *pProxDev, uint_t i2cAddr, byte_t bufWrite[], size_t countWrite, byte_t bufRead[], size_t countRead)
	Perform a write/read transaction between an I2C device.
int	ProxDevI2CWrite (BsProxyDev_T *pProxDev, uint_t i2cAddr, byte_t bufWrite[], size_t countWrite)
	Write buffer to an I2C device.
int	ProxDevI2CRead (BsProxyDev_T *pProxDev, uint_t i2cAddr, byte_t bufRead[], size_t countRead)
	Read bytes from an I2C device.
Variables
static byte_t	i2c_scanned_dev [128]
	scanned device vector
static byte_t	i2c_scanned_cnt
	scanned device count

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Function Documentation

static int cb_i2c_scan (  i2c_t *  pI2C, i2c_dev_t  addr, void *  context )  [static]

Scanned device callback. Parameters: pI2C  libi2c interface. addr  I2C discovered address context  Scan context (not used). Returns: Returns 1 for success. Definition at line 85 of file proxdev_i2c.c. References i2c_scanned_cnt, and i2c_scanned_dev. Referenced by ProxDevI2CScan(). { i2c_scanned_dev[i2c_scanned_cnt++] = (byte_t)addr; return 1; }

int ProxDevI2CRead (  BsProxyDev_T *  pProxDev, uint_t  i2cAddr, byte_t  bufRead[], size_t  countRead )

Read bytes from an I2C device. Parameters: pProxDev  Proxied device. i2cAddr  I2C address. [out]  bufRead  Read buffer. countRead  Number of bytes to read from device to read buffer. Returns: Returns number of bytes read on success, <=0 on error. Definition at line 212 of file proxdev_i2c.c. References BsProxyDev_T::i2c, BsProxyDevI2C_T::m_fd, BsProxyDev_T::m_mutDev, BsProxyDev_T::m_sDevName, and BsProxyDev_T::m_unDevSpec. Referenced by CmdDevRead(). { i2c_t i2c; int n; pthread_mutex_lock(&pProxDev->m_mutDev); i2c.fd = pProxDev->m_unDevSpec.i2c.m_fd; i2c.dev = 0; n = i2c_llread(&i2c, i2cAddr, (char *)bufRead, (uint_t)countRead); if( n <= 0 ) { LOGSYSERROR("%s: i2c_llread(0x%02x...)", pProxDev->m_sDevName, i2cAddr); } pthread_mutex_unlock(&pProxDev->m_mutDev); return n; }

int ProxDevI2CScan (  BsProxyDev_T *  pProxDev, byte_t  bufScan[], size_t  sizeBuf )

Scan I2C Bus for attached address. The addresses of all discovered devices are returned. Parameters: pProxDev  Proxied device. [out]  bufScan  Vector of addresses of discovered devices from scan. sizeBuf  Size of scan buffer. Returns: Returns number of discovered devices. Definition at line 107 of file proxdev_i2c.c. References cb_i2c_scan(), BsProxyDev_T::i2c, i2c_scanned_cnt, i2c_scanned_dev, BsProxyDevI2C_T::m_fd, BsProxyDev_T::m_mutDev, and BsProxyDev_T::m_unDevSpec. Referenced by CmdDevScan(). { i2c_t i2c; int n; pthread_mutex_lock(&pProxDev->m_mutDev); i2c.fd = pProxDev->m_unDevSpec.i2c.m_fd; i2c.dev = 0; i2c_scanned_cnt = 0; i2c_scan(&i2c, cb_i2c_scan, NULL); for(n=0; n<i2c_scanned_cnt && n<sizeBuf; ++n) { bufScan[n] = i2c_scanned_dev[n]; } pthread_mutex_unlock(&pProxDev->m_mutDev); return n; }

int ProxDevI2CTrans (  BsProxyDev_T *  pProxDev, uint_t  i2cAddr, byte_t  bufWrite[], size_t  countWrite, byte_t  bufRead[], size_t  countRead )

Perform a write/read transaction between an I2C device. Parameters: pProxDev  Proxied device. i2cAddr  I2C address. bufWrite  Write buffer. countWrite  Number of bytes to write from write buffer to device. [out]  bufRead  Read buffer. countRead  Number of bytes to read from device to read buffer. Returns: Returns number of bytes read on success, <=0 on error. Definition at line 143 of file proxdev_i2c.c. References BsProxyDev_T::i2c, BsProxyDevI2C_T::m_fd, BsProxyDev_T::m_mutDev, BsProxyDev_T::m_sDevName, and BsProxyDev_T::m_unDevSpec. Referenced by BPFootCmdGetCooked(), BPFootCmdGetIds(), BPFootCmdGetRaw(), BPIMUCmdGetCooked(), BPIMUCmdGetIds(), BPIMUCmdGetRaw(), and CmdDevTrans(). { i2c_t i2c; int n; pthread_mutex_lock(&pProxDev->m_mutDev); i2c.fd = pProxDev->m_unDevSpec.i2c.m_fd; i2c.dev = i2cAddr; n = i2c_lltransfer(&i2c, i2cAddr, (char *)bufWrite, (uint_t)countWrite, (char *)bufRead, (uint_t)countRead); if( n <= 0 ) { LOGSYSERROR("%s: i2c_lltransfer(0x%02x...)", pProxDev->m_sDevName, i2cAddr); } pthread_mutex_unlock(&pProxDev->m_mutDev); return n; }

int ProxDevI2CWrite (  BsProxyDev_T *  pProxDev, uint_t  i2cAddr, byte_t  bufWrite[], size_t  countWrite )

Write buffer to an I2C device. Parameters: pProxDev  Proxied device. i2cAddr  I2C address. bufWrite  Write buffer. countWrite  Number of bytes to write from write buffer to device. Returns: Returns number of bytes written on success, <=0 on error. Definition at line 179 of file proxdev_i2c.c. References BsProxyDev_T::i2c, BsProxyDevI2C_T::m_fd, BsProxyDev_T::m_mutDev, BsProxyDev_T::m_sDevName, and BsProxyDev_T::m_unDevSpec. Referenced by BPFootCmdSetCal(), BPIMUCmdSetCal(), BPIMUCmdSetOrientation(), and CmdDevWrite(). { i2c_t i2c; int n; pthread_mutex_lock(&pProxDev->m_mutDev); i2c.fd = pProxDev->m_unDevSpec.i2c.m_fd; i2c.dev = 0; n = i2c_llwrite(&i2c, i2cAddr, (char *)bufWrite, (uint_t)countWrite); if( n <= 0 ) { LOGSYSERROR("%s: i2c_llwrite(0x%02x...)", pProxDev->m_sDevName, i2cAddr); } pthread_mutex_unlock(&pProxDev->m_mutDev); return n; }

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