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