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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012,2013 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file lis302dl.c
* @brief LIS302DL MEMS interface module through SPI code.
*
* @addtogroup lis302dl
* @{
*/
#include "ch.h"
#include "hal.h"
#include "lis302dl.h"
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local variables and types. */
/*===========================================================================*/
static uint8_t txbuf[2];
static uint8_t rxbuf[2];
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Reads a register value.
* @pre The SPI interface must be initialized and the driver started.
*
* @param[in] spip pointer to the SPI initerface
* @param[in] reg register number
* @return The register value.
*/
uint8_t lis302dlReadRegister(SPIDriver *spip, uint8_t reg) {
spiSelect(spip);
txbuf[0] = 0x80 | reg;
txbuf[1] = 0xff;
spiExchange(spip, 2, txbuf, rxbuf);
spiUnselect(spip);
return rxbuf[1];
}
/**
* @brief Writes a value into a register.
* @pre The SPI interface must be initialized and the driver started.
*
* @param[in] spip pointer to the SPI initerface
* @param[in] reg register number
* @param[in] value the value to be written
*/
void lis302dlWriteRegister(SPIDriver *spip, uint8_t reg, uint8_t value) {
switch (reg) {
default:
/* Reserved register must not be written, according to the datasheet
this could permanently damage the device.*/
chDbgAssert(FALSE, "lis302dlWriteRegister(), #1", "reserved register");
case LIS302DL_WHO_AM_I:
case LIS302DL_HP_FILTER_RESET:
case LIS302DL_STATUS_REG:
case LIS302DL_OUTX:
case LIS302DL_OUTY:
case LIS302DL_OUTZ:
case LIS302DL_FF_WU_SRC1:
case LIS302DL_FF_WU_SRC2:
case LIS302DL_CLICK_SRC:
/* Read only registers cannot be written, the command is ignored.*/
return;
case LIS302DL_CTRL_REG1:
case LIS302DL_CTRL_REG2:
case LIS302DL_CTRL_REG3:
case LIS302DL_FF_WU_CFG1:
case LIS302DL_FF_WU_THS1:
case LIS302DL_FF_WU_DURATION1:
case LIS302DL_FF_WU_CFG2:
case LIS302DL_FF_WU_THS2:
case LIS302DL_FF_WU_DURATION2:
case LIS302DL_CLICK_CFG:
case LIS302DL_CLICK_THSY_X:
case LIS302DL_CLICK_THSZ:
case LIS302DL_CLICK_TIMELIMIT:
case LIS302DL_CLICK_LATENCY:
case LIS302DL_CLICK_WINDOW:
spiSelect(spip);
txbuf[0] = reg;
txbuf[1] = value;
spiSend(spip, 2, txbuf);
spiUnselect(spip);
}
}
/** @} */
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