AD7190代码

/***************************************************************************//** * @file AD7190.c * @brief Implementation of AD7190 Driver. * @author DNechita (Dan.Nechita@analog.com) ******************************************************************************** * Copyright 2012(c) Analog Devices, Inc. * * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * - Neither the name of Analog Devices, Inc. nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * - The use of this software may or may not infringe the patent rights * of one or more patent holders. This license does not release you * from the requirement that you obtain separate licenses from these * patent holders to use this software. * - Use of the software either in source or binary form, must be run * on or directly connected to an Analog Devices Inc. component. * * THIS SOFTWARE IS PROVIDED BY ANALOG DEVICES "AS IS" AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, NON-INFRINGEMENT, * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL ANALOG DEVICES BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, INTELLECTUAL PROPERTY RIGHTS, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * ******************************************************************************** * SVN Revision: 903 *******************************************************************************/ /******************************************************************************/ /***************************** Include Files **********************************/ /******************************************************************************/ #include "AD7190.h" // AD7190 definitions. #include "TIME.h" // TIME definitions. /***************************************************************************//** * @brief Writes data into a register. * * @param registerAddress - Address of the register. * @param registerValue - Data value to write. * @param bytesNumber - Number of bytes to be written. * @param modifyCS - Allows Chip Select to be modified. * * @return none. *******************************************************************************/ void AD7190_SetRegisterValue(unsigned char registerAddress, unsigned long registerValue, unsigned char bytesNumber, unsigned char modifyCS) { unsigned char writeCommand[5] = {0, 0, 0, 0, 0}; unsigned char* dataPointer = (unsigned char*)&registerValue; unsigned char bytesNr = bytesNumber; writeCommand[0] = AD7190_COMM_WRITE | AD7190_COMM_ADDR(registerAddress); while(bytesNr > 0) { writeCommand[bytesNr] = *dataPointer; dataPointer ++; bytesNr --; } SPI_Write(AD7190_SLAVE_ID * modifyCS, writeCommand, bytesNumber + 1); } /***************************************************************************//** * @brief Reads the value of a register. * * @param registerAddress - Address of the register. * @param bytesNumber - Number of bytes that will be read. * @param modifyCS - Allows Chip Select to be modified. * * @return buffer - Value of the register. *******************************************************************************/ unsigned long AD7190_GetRegisterValue(unsigned char registerAddress, unsigned char bytesNumber, unsigned char modifyCS) { unsigned char registerWord[5] = {0, 0, 0, 0, 0}; unsigned long buffer = 0x0; unsigned char i = 0; registerWord[0] = AD7190_COMM_READ | AD7190_COMM_ADDR(registerAddress); SPI_Read(AD7190_SLAVE_ID * modifyCS, registerWord, bytesNumber + 1); for(i = 1; i < bytesNumber + 1; i++) { buffer = (buffer << 8) + registerWord[i]; } return buffer; } /***************************************************************************//** * @brief Checks if the AD7190 part is present. * * @return status - Indicates if the part is present or not. *******************************************************************************/ unsigned char AD7190_Init(void) { unsigned char status = 1; unsigned char regVal = 0; SPI_Init(0, 1000000, 1, 0); AD7190_Reset(); /* Allow at least 500 us before accessing any of the on-chip registers. */ TIME_DelayMs(1); regVal = AD7190_GetRegisterValue(AD7190_REG_ID, 1, 1); if( (regVal & AD7190_ID_MASK) != ID_AD7190) { status = 0; } return status ; } /***************************************************************************//** * @brief Resets the device. * * @return none. *******************************************************************************/ void AD7190_Reset(void) { unsigned char registerWord[7]; registerWord[0] = 0x01; registerWord[1] = 0xFF; registerWord[2] = 0xFF; registerWord[3] = 0xFF; registerWord[4] = 0xFF; registerWord[5] = 0xFF; registerWord[6] = 0xFF; SPI_Write(AD7190_SLAVE_ID, registerWord, 7); } /***************************************************************************//** * @brief Set device to idle or power-down. * * @param pwrMode - Selects idle mode or power-down mode. * Example: 0 - power-down * 1 - idle * * @return none. *******************************************************************************/ void AD7190_SetPower(unsigned char pwrMode) { unsigned long oldPwrMode = 0x0; unsigned long newPwrMode = 0x0; oldPwrMode = AD7190_GetRegisterValue(AD7190_REG_MODE, 3, 1); oldPwrMode &= ~(AD7190_MODE_SEL(0x7)); newPwrMode = oldPwrMode | AD7190_MODE_SEL((pwrMode * (AD7190_MODE_IDLE)) | (!pwrMode * (AD7190_MODE_PWRDN))); AD7190_SetRegisterValue(AD7190_REG_MODE, newPwrMode, 3, 1); } /***************************************************************************//** * @brief Waits for RDY pin to go low. * * @return none. *******************************************************************************/ void AD7190_WaitRdyGoLow(void) { unsigned long timeOutCnt = 0xFFFFF; while(AD7190_RDY_STATE && timeOutCnt--) { ; } } /***************************************************************************//** * @brief Selects the channel to be enabled. * * @param channel - Selects a channel. * * @return none. *******************************************************************************/ void AD7190_ChannelSelect(unsigned short channel) { unsigned long oldRegValue = 0x0; unsigned long newRegValue = 0x0; oldRegValue = AD71