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96 lines
2.8 KiB
C
96 lines
2.8 KiB
C
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/**
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******************************************************************************
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*
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* @file pios_hmc5843.c
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* @author The OpenPilot Team, http://www.openpilot.org Copyright (C) 2010.
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* @brief HMC5843 Magnetic Sensor Functions
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* @see The GNU Public License (GPL) Version 3
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* @defgroup PIOS_HMC5843 HMC5843 Functions
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* @{
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*
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*****************************************************************************/
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/* Project Includes */
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#include "pios.h"
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#if defined(PIOS_INCLUDE_HMC5843)
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/* Glocal Variables */
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/* Local Variables */
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/**
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* Initialise the HMC5843 sensor
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*/
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void PIOS_HMC5843_Init(void)
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{
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// Set in continuous mode
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PIOS_HMC5843_Write(0x02, 0x00);
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}
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/**
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* Reads one or more bytes into a buffer
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* \param[in] address HMC5843 register address (depends on size)
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* \param[out] buffer destination buffer
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* \param[in] len number of bytes which should be read
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* \return 0 if operation was successful
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* \return -1 if error during I2C transfer
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* \return -4 if invalid length
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*/
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int32_t PIOS_HMC5843_Read(uint8_t address, uint8_t *buffer, uint8_t len)
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{
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/* Send I2C address and register address */
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/* To avoid issues copy address into temporary buffer */
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uint8_t addr_buffer[1] = {(uint8_t)address};
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int32_t error = PIOS_I2C_Transfer(I2C_Write_WithoutStop, HMC5843_I2C_ADDR, addr_buffer, 1);
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/* Now receive byte(s) */
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if(!error) {
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error = PIOS_I2C_Transfer(I2C_Read, HMC5843_I2C_ADDR, buffer, len);
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}
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/* Return error status */
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return error < 0 ? -1 : 0;
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}
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/**
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* Writes one or more bytes to the HMC5843
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* \param[in] address Register address
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* \param[in] buffer source buffer
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* \return 0 if operation was successful
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* \return -1 if error during I2C transfer
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*/
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int32_t PIOS_HMC5843_Write(uint8_t address, uint8_t buffer)
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{
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/* Send I2C address and data */
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uint8_t WriteBuffer[2];
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WriteBuffer[0] = address;
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WriteBuffer[1] = buffer;
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int32_t error = PIOS_I2C_Transfer(I2C_Write, HMC5843_I2C_ADDR, WriteBuffer, 2);
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/* Return error status */
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return error < 0 ? -1 : 0;
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}
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#endif
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