ad7793 驱动 h 及 c 文件

/***************************************************************************//** * @file AD7793.h
* @brief Header file of AD7793 Driver.
* @author Bancisor Mihai
******************************************************************************* *
* 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: 500
******************************************************************************* /
#ifndef __AD7793_H__
#define __AD7793_H__
/****************************************************************************** /
/* AD7793 */ /****************************************************************************** /
/* AD7793 GPIO */
#define AD7793_RDY_STATE GPIO1_STATE
/*AD7793 Registers*/
#define AD7793_REG_COMM 0 /* Communications Register(WO, 8-bit) */
#define AD7793_REG_STAT 0 /* Status Register (RO, 8-bit) */
#define AD7793_REG_MODE 1 /* Mode Register (RW, 16-bit */
#define AD7793_REG_CONF 2 /* Configuration Register (RW, 16-bit)*/
#define AD7793_REG_DATA 3 /* Data Register (RO, 16-/24-bit) */
#define AD7793_REG_ID 4 /* ID Register (RO, 8-bit) */
#define AD7793_REG_IO 5 /* IO Register (RO, 8-bit) */
#define AD7793_REG_OFFSET 6 /* Offset Register (RW, 24-bit */
#define AD7793_REG_FULLSALE 7 /* Full-Scale Register (RW, 24-bit */
/* Communications Register Bit Designations (AD7793_REG_COMM) */
#define AD7793_COMM_WEN (1 << 7) /* Write Enable */
#define AD7793_COMM_WRITE (0 << 6) /* Write Operation */
#define AD7793_COMM_READ (1 << 6) /* Read Operation */
#define AD7793_COMM_ADDR(x) (((x) & 0x7) << 3) /* Register Address */
#define AD7793_COMM_CREAD (1 << 2) /* Continuous Read of Data Register */
/* Status Register Bit Designations (AD7793_REG_STAT) */
#define AD7793_STAT_RDY (1 << 7) /* Ready */
#define AD7793_STAT_ERR (1 << 6) /* Error (Overrange, Underrange) */
#define AD7793_STAT_CH3 (1 << 2) /* Channel 3 */
#define AD7793_STAT_CH2 (1 << 1) /* Channel 2 */
#define AD7793_STAT_CH1 (1 << 0) /* Channel 1 */
/* Mode Register Bit Designations (AD7793_REG_MODE) */
#define AD7793_MODE_SEL(x) (((x) & 0x7) << 13) /* Operation Mode Select */
#define AD7793_MODE_CLKSRC(x) (((x) & 0x3) << 6) /* ADC Clock Source Select */
#define AD7793_MODE_RATE(x) ((x) & 0xF) /* Filter Update Rate Select */
/* AD7793_MODE_SEL(x) options */
#define AD7793_MODE_CONT 0 /* Continuous Conversion Mode */
#define AD7793_MODE_SINGLE 1 /* Single Conversion Mode */
#define AD7793_MODE_IDLE 2 /* Idle Mode */
#define AD7793_MODE_PWRDN 3 /* Power-Down Mode */
#define AD7793_MODE_CAL_INT_ZERO 4 /* Internal Zero-Scale Calibration */
#define AD7793_MODE_CAL_INT_FULL 5 /* Internal Full-Scale Calibration */
#define AD7793_MODE_CAL_SYS_ZERO 6 /* System Zero-Scale Calibration */
#define AD7793_MODE_CAL_SYS_FULL 7 /* System Full-Scale Calibration */
/* AD7793_MODE_CLKSRC(x) options */
#define AD7793_CLK_INT 0 /* Internal 64 kHz Clk not available at the CLK pin */
#define AD7793_CLK_INT_CO 1 /* Internal 64 kHz Clk available at the CLK pin */
#define AD7793_CLK_EXT 2 /* External 64 kHz Clock */
#define AD7793_CLK_EXT_DIV2 3 /* External Clock divided by 2 */
/* AD7793_MODE_RATE(x) options */
#define AD7793_FLRAT_123 0x3 /* filer rate 123Hz */
#define AD7793_FLRAT_40 0x6 /* filer rate 40Hz */
#define AD7793_FLRAT_20 0x8 /* filer rate 20Hz */
#define AD7793_FLRAT_10 0xc /* filer rate 10Hz */
#define AD7793_FLRAT_4 0xf /* filer rate 4Hz */
/* Configuration Register Bit Designations (AD7793_REG_CONF) */
#define AD7793_CONF_VBIAS(x) (((x) & 0x3) << 14) /* Bias Voltage Generator Enable */ #define AD7793_CONF_BO_EN (1 << 13) /* Burnout Current Enable */
#define AD7793_CONF_UNIPOLAR (1 << 12) /* Unipolar/Bipolar Enable */
#define AD7793_CONF_BOOST (1 << 11) /* Boost Enable */
#define AD7793_CONF_GAIN(x) (((x) & 0x7) << 8) /* Gain Select */
#define AD7793_CONF_REFSEL(x) (((x) & 0x1) << 7) /* INT/EXT Reference Select */
#define AD7793_CONF_BUF(x) (((x) & 0x1) << 4) /* Buffered Mode Enable */
#define AD7793_CONF_CHAN(x) ((x) & 0x7) /* Channel select */
/* AD7793_CONF_GAIN(x) options */
#define AD7793_GAIN_1 0
#define AD7793_GAIN_2 1
#define AD7793_GAIN_4 2
#define AD7793_GAIN_8 3
#define AD7793_GAIN_16 4
#define AD7793_GAIN_32 5
#define AD7793_GAIN_64 6
#define AD7793_GAIN_128 7
/* AD7793_CONF_BUF(x) options */
#define AD7793_CONF_BUF_ON 1
#define AD7793_CONF_BUF_OFF 0
/* AD7793_CONF_REFSEL(x) options */
#define AD7793_REFSEL_INT 1 /* Internal Reference Selected. */
#define AD7793_REFSEL_EXT 0 /* External Reference Applied between REFIN(+) and REFIN(?. */
/* AD7793_CONF_CHAN(x) options */
#define AD7793_CH_AIN1P_AIN1M 0 /* AIN1(+) - AIN1(-) */
#define AD7793_CH_AIN2P_AIN2M 1 /* AIN2(+) - AIN2(-) */
#define AD7793_CH_AIN3P_AIN3M 2 /* AIN3(+) - AIN3(-) */
#define AD7793_CH_AIN1M_AIN1M 3 /* AIN1(-) - AIN1(-) */
#define AD7793_CH_TEMP 6 /* Temp Sensor */
#define AD7793_CH_AVDD_MONITOR 7 /* AVDD Monitor */
/* ID Register Bit Designations (AD7793_REG_ID) */
#define AD7793_ID 0xB
#define AD7793_ID_MASK 0xF
/* IO (Excitation Current Sources) Register Bit Designations (AD7793_REG_IO) */
#define AD7793_IEXCDIR(x) (((x) & 0x3) << 2)
#define AD7793_IEXCEN(x) (((x) & 0x3) << 0)
/* AD7793_IEXCDIR(x) options*/
#define AD7793_DIR_IEXC1_IOUT1_IEXC2_IOUT2 0 /* IEXC1 connect to IOUT1, IEXC2 connect to IOUT2 */
#define AD7793_DIR_IEXC1_IOUT2_IEXC2_IOUT1 1 /* IEXC1 connect to IOUT2, IEXC2 connect to IOUT1 */
#define AD7793_DIR_IEXC1_IEXC2_IOUT1 2 /* Both current sources IEXC1,2 connect to IOUT1 */
#define AD7793_DIR_IEXC1_IEXC2_IOUT2 3 /* Both current sources IEXC1,2 connect to IOUT2 */
/* AD7793_IEXCEN(x) options*/
#define AD7793_EN_IXCEN_10uA 1 /* Excitation Current 10uA */
#define AD7793_EN_IXCEN_210uA 2 /* Excitation Current 210uA */
#define AD7793_EN_IXCEN_1mA 3 /* Excitation Current 1mA */
/****************************************************************************** /
/* Functions Prototypes */
/****************************************************************************** /
/* Initialize AD7793 and check if the device is present*/
unsigned char AD7793_Init(void);
/* Sends 32 consecutive 1's on SPI in order to reset the part. */
void AD7793_Reset(void);
/* Reads the value of the selected register. */
unsigned long AD7793_GetRegisterValue(unsigned char regAddress,
unsigned char size,
unsigned char modifyCS);
/* Writes a value to the register. */
void AD7793_SetRegisterValue(unsigned char regAddress,
unsigned long regValue,
unsigned char size,
unsigned char modifyCS);
/* Waits for RDY pin to go low. */
void AD7793_WaitRdyGoLow(void);
/* Sets the operating mode of AD7793. */
void AD7793_SetMode(unsigned long mode);
/* Selects the channel of AD7793. */
void AD7793_SetChannel(unsigned long channel);
/* Sets the gain of the In-Amp. */
void AD7793_SetGain(unsigned long gain);
/* Sets the BUF */
void AD7793_BUF(unsigned char type);
/* Sets the IXuA */
void AD7793_SetIEXT(unsigned long IXEN_uA);
/* Sets the FilerRate */
void AD7793_SetFilerRate(unsigned long FilerRate);
/* Sets the reference source for the ADC. */
void AD7793_SetIntReference(unsigned char type);
/* Performs the given calibration to the specified channel. */
void AD7793_Calibrate(unsigned char mode, unsigned char channel);
/* Returns the result of a single conversion. */
unsigned long AD7793_SingleConversion(void);
/* Returns the average of several conversion results. */
unsigned long AD7793_ContinuousReadAvg(unsigned char sampleNumber);
#endif // _AD7793_H_
/***************************************************************************//** * @file AD7793.c
* @brief Implementation of AD7793 Driver.
* @author Bancisor MIhai
******************************************************************************* *
* 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: 500
******************************************************************************* /
/****************************************************************************** /
/* Include Files */
/****************************************************************************** /
#include "AD7793.h" // AD7793 definitions.
#include "Communication.h" // Communication definitions.
#include "GLOBE.h"
/***************************************************************************//** * @brief Initializes the AD7793 and checks if the device is present.
*
* @return status - Result of the initialization procedure.
* Example: 1 - if initialization was successful (ID is 0x0B).
* 0 - if initialization was unsuccessful.
******************************************************************************* /
union
{
unsigned long LONG;
unsigned char CHAR[4];
}LONG_CHAR;
unsigned char AD7793_Init(void)
{
unsigned char status = 0x1;
SPI_Init_AD7793(0, 1000000, 1, 1);
if((AD7793_GetRegisterValue(AD7793_REG_ID, 1, 1) & 0x0F) != AD7793_ID)
{
status = 0x0;
}
return(status);
}
/***************************************************************************//**
* @brief Sends 32 consecutive 1's on SPI in order to reset the part.
*
* @return None.
******************************************************************************* /
void AD7793_Reset(void)
{
unsigned char dataToSend[5] = {0x03, 0xff, 0xff, 0xff, 0xff};
ADI_PART_CS_LOW;
SPI_Write(dataToSend,4);
ADI_PART_CS_HIGH;
}
/***************************************************************************//** * @brief Reads the value of the selected register
*
* @param regAddress - The address of the register to read.
* @param size - The size of the register to read.
*
* @return data - The value of the selected register register.
******************************************************************************* /
unsigned long AD7793_GetRegisterValue(unsigned char regAddress,
unsigned char size,
unsigned char modifyCS)
{
unsigned char data[5] = {0x00, 0x00, 0x00, 0x00, 0x00};
unsigned long receivedData = 0x00;
unsigned char i = 0x00;
data[0] = 0x01 * modifyCS;
data[1] = AD7793_COMM_READ | AD7793_COMM_ADDR(regAddress);
SPI_Read(data,(1 + size));
for(i = 1;i < size + 1;i ++)
{
receivedData = (receivedData << 8) + data[i];
}
return (receivedData);
}
/***************************************************************************//** * @brief Writes the value to the register
*
* @param - regAddress - The address of the register to write to.
* @param - regValue - The value to write to the register.
* @param - size - The size of the register to write.
*
* @return None.
******************************************************************************* /
void AD7793_SetRegisterValue(unsigned char regAddress,
unsigned long regValue,
unsigned char size,
unsigned char modifyCS)
{
unsigned char data[5] = {0x00, 0x00, 0x00, 0x00, 0x00};
//unsigned char* dataPointer = (unsigned char*)&regValue;
unsigned char bytesNr = size + 1;
LONG_CHAR.LONG = regValue;
data[0] = 0x01 * modifyCS;
data[1] = AD7793_COMM_WRITE | AD7793_COMM_ADDR(regAddress);
// while(bytesNr > 1)
// {
if(bytesNr == 3)
{
data[2] = LONG_CHAR.CHAR[2];
data[3] = LONG_CHAR.CHAR[3];
}
if(bytesNr == 2)
{
data[2] = LONG_CHAR.CHAR[3];
}
// bytesNr --;
//
// }
SPI_Write(data,(1 + size));
}
/***************************************************************************//** * @brief Waits for RDY pin to go low.
*
* @return None.
******************************************************************************* /
void AD7793_WaitRdyGoLow(void)
{
while( AD7793_RDY_STATE )
{
;
}
}
/***************************************************************************//** * @brief Sets the operating mode of AD7793.
*
* @param mode - Mode of operation.
*
* @return None.
******************************************************************************* /
void AD7793_SetMode(unsigned long mode)
{
unsigned long command;
command = AD7793_GetRegisterValue(AD7793_REG_MODE,
2,
1); // CS is modified by SPI read/write functions.
command &= ~AD7793_MODE_SEL(0xFF);
command |= AD7793_MODE_SEL(mode);
AD7793_SetRegisterValue(
AD7793_REG_MODE,
command,
2,
1); // CS is modified by SPI read/write functions.
}
/***************************************************************************//** * @brief Selects the channel of AD7793.
*
* @param channel - ADC channel selection.
*
* @return None.
******************************************************************************* /
void AD7793_SetChannel(unsigned long channel)
{
unsigned long command;
command = AD7793_GetRegisterValue(AD7793_REG_CONF,
2,
1); // CS is modified by SPI read/write functions.
command &= ~AD7793_CONF_CHAN(0xFF);
command |= AD7793_CONF_CHAN(channel);
AD7793_SetRegisterValue(
AD7793_REG_CONF,
command,
2,
1); // CS is modified by SPI read/write functions.
}
/***************************************************************************//** * @brief Sets the gain of the In-Amp.
*
* @param gain - Gain.
*
* @return None.
******************************************************************************* /
void AD7793_SetGain(unsigned long gain)
{
unsigned long command;
command = AD7793_GetRegisterValue(AD7793_REG_CONF,
2,
1); // CS is modified by SPI read/write functions.
command &= ~AD7793_CONF_GAIN(0xFF);
command |= AD7793_CONF_GAIN(gain);
AD7793_SetRegisterValue(
AD7793_REG_CONF,
command,
2,
1); // CS is modified by SPI read/write functions.
}
/***************************************************************************//** * @brief Sets the IEXT.
*
* @param gain - Gain.
*
* @return None.
******************************************************************************* /
void AD7793_SetIEXT(unsigned long IXEN_uA)
{
unsigned long command;
command = AD7793_GetRegisterValue(AD7793_REG_IO,
1,
1); // CS is modified by SPI read/write functions.
command &= ~AD7793_IEXCEN(0xFF);
command |= AD7793_IEXCEN(IXEN_uA);
AD7793_SetRegisterValue(
AD7793_REG_IO,
command,
1,
1); // CS is modified by SPI read/write functions.
}
/***************************************************************************//** * @brief Sets the filer.
*
* @param gain - Gain.
*
* @return None.
******************************************************************************* /
void AD7793_SetFilerRate(unsigned long FilerRate)
{
unsigned long command;
command = AD7793_GetRegisterValue(AD7793_REG_MODE,
2,
1); // CS is modified by SPI read/write functions.
command &= ~ AD7793_MODE_RATE(0xF);
command |= AD7793_MODE_RATE(FilerRate);
AD7793_SetRegisterValue(
AD7793_REG_MODE,
command,
2,
1); // CS is modified by SPI read/write functions.
}
/***************************************************************************//** * @brief Sets the reference source for the ADC.
*
* @param type - Type of the reference.
* Example: AD7793_REFSEL_EXT - External Reference Selected
* AD7793_REFSEL_INT - Internal Reference Selected.
*
* @return None.
******************************************************************************* /
void AD7793_BUF(unsigned char type)
{
unsigned long command = 0;
command = AD7793_GetRegisterValue(AD7793_REG_CONF,
2,
1); // CS is modified by SPI read/write functions.
command &= ~AD7793_CONF_BUF(AD7793_CONF_BUF_ON);
command |= AD7793_CONF_BUF(type);
AD7793_SetRegisterValue(AD7793_REG_CONF,
command,
2,
1); // CS is modified by SPI read/write functions.
}
/***************************************************************************//** * @brief Sets the reference source for the ADC.
*
* @param type - Type of the reference.
* Example: AD7793_REFSEL_EXT - External Reference Selected
* AD7793_REFSEL_INT - Internal Reference Selected.
*
* @return None.
******************************************************************************* /
void AD7793_SetIntReference(unsigned char type)
{
unsigned long command = 0;
command = AD7793_GetRegisterValue(AD7793_REG_CONF,
2,
1); // CS is modified by SPI read/write functions.
command &= ~AD7793_CONF_REFSEL(AD7793_REFSEL_INT);
command |= AD7793_CONF_REFSEL(type);
AD7793_SetRegisterValue(AD7793_REG_CONF,
command,
2,
1); // CS is modified by SPI read/write functions.
}
/***************************************************************************//** * @brief Performs the given calibration to the specified channel.
*
* @param mode - Calibration type.
* @param channel - Channel to be calibrated.
*
* @return none.
******************************************************************************* /
void AD7793_Calibrate(unsigned char mode, unsigned char channel)
{
unsigned short oldRegValue = 0x0;
unsigned short newRegValue = 0x0;
AD7793_SetChannel(channel);
oldRegValue &= AD7793_GetRegisterValue(AD7793_REG_MODE, 2, 1); // CS is modified by SPI read/write functions.
oldRegValue &= ~AD7793_MODE_SEL(0x7);
newRegValue = oldRegValue | AD7793_MODE_SEL(mode);
ADI_PART_CS_LOW;
AD7793_SetRegisterValue(AD7793_REG_MODE, newRegValue, 2, 0); // CS is not modified by SPI read/write functions.
AD7793_WaitRdyGoLow();
ADI_PART_CS_HIGH;
}
/***************************************************************************//** * @brief Returns the result of a single conversion.
*
* @return regData - Result of a single analog-to-digital conversion.
******************************************************************************* /
unsigned long AD7793_SingleConversion(void)
{
unsigned long command = 0x0;
unsigned long regData = 0x0;
command = AD7793_MODE_SEL(AD7793_MODE_SINGLE);
ADI_PART_CS_LOW;
AD7793_SetRegisterValue(AD7793_REG_MODE,
command,
2,
0);// CS is not modified by SPI read/write functions.
AD7793_WaitRdyGoLow();
regData = AD7793_GetRegisterValue(AD7793_REG_DATA, 3, 0); // CS is not modified by SPI read/write functions.
ADI_PART_CS_HIGH;
return(regData);
}
/***************************************************************************//** * @brief Returns the average of several conversion results.
*
* @return samplesAverage - The average of the conversion results.
******************************************************************************* /
unsigned long AD7793_ContinuousReadAvg(unsigned char sampleNumber)
{
unsigned long samplesAverage = 0x0;
unsigned long command = 0x0;
unsigned char count = 0x0;
command = AD7793_MODE_SEL(AD7793_MODE_CONT);
ADI_PART_CS_LOW;
AD7793_SetRegisterValue(AD7793_REG_MODE,
command,
2,
0);// CS is not modified by SPI read/write functions.
for(count = 0;count < sampleNumber;count ++)
{
AD7793_WaitRdyGoLow();
samplesAverage += AD7793_GetRegisterValue(AD7793_REG_DATA, 3, 0); // CS is not modified by SPI read/write functions.
}
ADI_PART_CS_HIGH;
samplesAverage = samplesAverage / sampleNumber;
return(samplesAverage);
}
启动初始化
unsigned char AD7793_SETUP()
{
unsigned char STATE;
AD7793_Reset(); //DelayMs(1000);// AD7793_Reset();
STATE = AD7793_Init();
if(STATE != 1)
{
DelayMs(2000);
DelayMs(2000);
DelayMs(2000);
DelayMs(2000);
DelayMs(2000);
AD7793_Reset();
STATE = AD7793_Init();
}
if(STATE != 1)
{
DelayMs(2000);
DelayMs(2000);
DelayMs(2000);
DelayMs(2000);
DelayMs(2000);
AD7793_Reset();
STATE = AD7793_Init();
}
if(STATE == 1)
{
AD7793_Reset();
AD7793_SetIntReference(AD7793_REFSEL_INT); // select internal 1.17V reference AD7793_SetGain(AD7793_GAIN_1); // set gain to 1
AD7793_BUF(AD7793_CONF_BUF_ON );
AD7793_SetChannel(AD7793_CH_AIN1P_AIN1M); // use AIN1(+) - AIN1(-) DelayMs(100);
AD7793_Calibrate(AD7793_MODE_CAL_INT_ZERO,
AD7793_CH_AIN1P_AIN1M);
DelayMs(100);
AD7793_Calibrate(AD7793_MODE_CAL_INT_FULL,
AD7793_CH_AIN1P_AIN1M);
DelayMs(100);
AD7793_SetChannel(AD7793_CH_AIN2P_AIN2M);
DelayMs(100);
AD7793_Calibrate(AD7793_MODE_CAL_INT_ZERO,
AD7793_CH_AIN2P_AIN2M);
DelayMs(100);
AD7793_Calibrate(AD7793_MODE_CAL_INT_FULL,
AD7793_CH_AIN2P_AIN2M);
DelayMs(100);
AD7793_SetIEXT(AD7793_EN_IXCEN_210uA); // set IX 210uA
AD7793_SetIntReference(AD7793_REFSEL_EXT); // select EX reference AD7793_SetFilerRate(AD7793_FLRAT_10); //10Hz
}
return STATE;
}。