ADS1015驱动程序
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ADS1015.c
/**************************************************************************//*! @file Adafruit_ADS1015.c @author K.Townsend (Adafruit Industries) @license BSD (see license.txt) Driver for the ADS1015/ADS1115 ADC This is a library for the Adafruit MPL115A2 breakout ----> https://www.adafruit.com/products/??? Adafruit invests time and resources providing this open source code, please support Adafruit and open-source hardware by purchasing products from Adafruit! @section HISTORY v1.0 - First release Edit by FangZheng 2014-12-11*/#include "global.h"static Uint16 m_i2cAddress;static Uint16 m_conversionDelay;static Uint16 m_bitShift;static adsGain_t m_gain;static Uint16 m_chn;#if 0/**************************************************************************//*! @brief Writes 16-bits to the specified destination register*//**************************************************************************/static void writeRegister(Uint16 i2cAddress, Uint16 reg, Uint16 value){ Wire.beginTransmission(i2cAddress); i2cwrite((Uint16)reg); i2cwrite((Uint16)(value >> 8)); i2cwrite((Uint16)(value & 0xFF)); Wire.endTransmission();}/**************************************************************************//*! @brief Writes 16-bits to the specified destination register*//**************************************************************************/static Uint16 readRegister(Uint16 i2cAddress, Uint16 reg){ Wire.beginTransmission(i2cAddress); i2cwrite(ADS1015_REG_POINTER_CONVERT); Wire.endTransmission(); Wire.requestFrom(i2cAddress, (Uint16)2); return ((i2cread() << 8) | i2cread());}#endif/**************************************************************************//*! @brief Instantiates a new ADS1015 class w/appropriate properties*//**************************************************************************/void ads1015_init(void){ m_i2cAddress = ADS1015_ADDRESS; m_conversionDelay = ADS1015_CONVERSIONDELAY; m_bitShift = 4; m_gain = GAIN_ONE; /* +/- 6.144V range (limited to VDD +0.3V max!) */ m_chn = 0;}#if 0/**************************************************************************//*! @brief Sets the gain and input voltage range*//**************************************************************************/void setGain(adsGain_t gain){ m_gain = gain;}/**************************************************************************//*! @brief Gets a gain and input voltage range*//**************************************************************************/adsGain_t getGain(){ return m_gain;}#endif/**************************************************************************//*! @brief Gets a single-ended ADC reading from the specified channel*//**************************************************************************/Uint16 readADC_SingleEnded(Uint16 channel){ Uint16 config; if (channel > 3) { return 0; } // Start with default values config = ADS1015_REG_CONFIG_CQUE_NONE | // Disable the comparator (default val) ADS1015_REG_CONFIG_CLAT_NONLAT | // Non-latching (default val) ADS1015_REG_CONFIG_CPOL_ACTVLOW | // Alert/Rdy active low (default val) ADS1015_REG_CONFIG_CMODE_TRAD | // Traditional comparator (default val) ADS1015_REG_CONFIG_DR_1600SPS | // 1600 samples per second (default) ADS1015_REG_CONFIG_MODE_SINGLE; // Single-shot mode (default) // Set PGA/voltage range config |= m_gain; // Set single-ended input channel switch (channel) { case (0): config |= ADS1015_REG_CONFIG_MUX_SINGLE_0; break; case (1): config |= ADS1015_REG_CONFIG_MUX_SINGLE_1; break; case (2): config |= ADS1015_REG_CONFIG_MUX_SINGLE_2; break; case (3): config |= ADS1015_REG_CONFIG_MUX_SINGLE_3; break; } // Set 'start single-conversion' bit config |= ADS1015_REG_CONFIG_OS_SINGLE; // Write config register to the ADC writeRegister(m_i2cAddress, ADS1015_REG_POINTER_CONFIG, config); // Wait for the conversion to complete //DELAY_US(m_conversionDelay); DELAY_US(350); // Read the conversion results // Shift 12-bit results right 4 bits for the ADS1015 return readRegister(m_i2cAddress, ADS1015_REG_POINTER_CONVERT) >> m_bitShift;}void read_adc_config(void){ Uint16 config; // Start with default values config = ADS1015_REG_CONFIG_CQUE_NONE | // Disable the comparator (default val) ADS1015_REG_CONFIG_CLAT_NONLAT | // Non-latching (default val) ADS1015_REG_CONFIG_CPOL_ACTVLOW | // Alert/Rdy active low (default val) ADS1015_REG_CONFIG_CMODE_TRAD | // Traditional comparator (default val) ADS1015_REG_CONFIG_DR_1600SPS | // 1600 samples per second (default) ADS1015_REG_CONFIG_MODE_SINGLE; // Single-shot mode (default) // Set PGA/voltage range config |= m_gain; // Set single-ended input channel switch (m_chn) { case (0): config |= ADS1015_REG_CONFIG_MUX_SINGLE_0; break; case (1): config |= ADS1015_REG_CONFIG_MUX_SINGLE_1; break; case (2): config |= ADS1015_REG_CONFIG_MUX_SINGLE_2; break; case (3): config |= ADS1015_REG_CONFIG_MUX_SINGLE_3; break; } // Set 'start single-conversion' bit config |= ADS1015_REG_CONFIG_OS_SINGLE; // Write config register to the ADC writeRegister(m_i2cAddress, ADS1015_REG_POINTER_CONFIG, config); }void read_adc_reg(volatile Uint16 *res0, volatile Uint16 *res1){ if(m_chn) { *res1 = readRegister(m_i2cAddress, ADS1015_REG_POINTER_CONVERT) >> m_bitShift; m_chn = 0; } else { *res0 = readRegister(m_i2cAddress, ADS1015_REG_POINTER_CONVERT) >> m_bitShift; m_chn = 1; }}void get_adc(volatile Uint16 *res0, volatile Uint16 *res1){ #define PER_CNT 6 static volatile Uint16 i = 0; if(i == 0) { read_adc_config(); } if(i == PER_CNT) { read_adc_reg(res0, res1); } if(i++ > PER_CNT) i = 0;}#if 0/**************************************************************************//*! @brief Reads the conversion results, measuring the voltage difference between the P (AIN0) and N (AIN1) input. Generates a signed value since the difference can be either positive or negative.*//**************************************************************************/int16_t readADC_Differential_0_1(void){ Uint16 res, config; // Start with default values config = ADS1015_REG_CONFIG_CQUE_NONE | // Disable the comparator (default val) ADS1015_REG_CONFIG_CLAT_NONLAT | // Non-latching (default val) ADS1015_REG_CONFIG_CPOL_ACTVLOW | // Alert/Rdy active low (default val) ADS1015_REG_CONFIG_CMODE_TRAD | // Traditional comparator (default val) ADS1015_REG_CONFIG_DR_1600SPS | // 1600 samples per second (default) ADS1015_REG_CONFIG_MODE_SINGLE; // Single-shot mode (default) // Set PGA/voltage range config |= m_gain; // Set channels config |= ADS1015_REG_CONFIG_MUX_DIFF_0_1; // AIN0 = P, AIN1 = N // Set 'start single-conversion' bit config |= ADS1015_REG_CONFIG_OS_SINGLE; // Write config register to the ADC writeRegister(m_i2cAddress, ADS1015_REG_POINTER_CONFIG, config); // Wait for the conversion to complete DELAY_US(m_conversionDelay); // Read the conversion results res = readRegister(m_i2cAddress, ADS1015_REG_POINTER_CONVERT) >> m_bitShift; if (m_bitShift == 0) { return (int16)res; } else { // Shift 12-bit results right 4 bits for the ADS1015, // making sure we keep the sign bit intact if (res > 0x07FF) { // negative number - extend the sign to 16th bit res |= 0xF000; } return (int16)res; }}/**************************************************************************//*! @brief Reads the conversion results, measuring the voltage difference between the P (AIN2) and N (AIN3) input. Generates a signed value since the difference can be either positive or negative.*//**************************************************************************/int16_t readADC_Differential_2_3(void){ Uint16 res, config; // Start with default values config = ADS1015_REG_CONFIG_CQUE_NONE | // Disable the comparator (default val) ADS1015_REG_CONFIG_CLAT_NONLAT | // Non-latching (default val) ADS1015_REG_CONFIG_CPOL_ACTVLOW | // Alert/Rdy active low (default val) ADS1015_REG_CONFIG_CMODE_TRAD | // Traditional comparator (default val) ADS1015_REG_CONFIG_DR_1600SPS | // 1600 samples per second (default) ADS1015_REG_CONFIG_MODE_SINGLE; // Single-shot mode (default) // Set PGA/voltage range config |= m_gain; // Set channels config |= ADS1015_REG_CONFIG_MUX_DIFF_2_3; // AIN2 = P, AIN3 = N // Set 'start single-conversion' bit config |= ADS1015_REG_CONFIG_OS_SINGLE; // Write config register to the ADC writeRegister(m_i2cAddress, ADS1015_REG_POINTER_CONFIG, config); // Wait for the conversion to complete DELAY_US(m_conversionDelay); // Read the conversion results res = readRegister(m_i2cAddress, ADS1015_REG_POINTER_CONVERT) >> m_bitShift; if (m_bitShift == 0) { return (int16)res; } else { // Shift 12-bit results right 4 bits for the ADS1015, // making sure we keep the sign bit intact if (res > 0x07FF) { // negative number - extend the sign to 16th bit res |= 0xF000; } return (int16)res; }}/**************************************************************************//*! @brief Sets up the comparator to operate in basic mode, causing the ALERT/RDY pin to assert (go from high to low) when the ADC value exceeds the specified threshold. This will also set the ADC in continuous conversion mode.*//**************************************************************************/void startComparator_SingleEnded(Uint16 channel, int16_t threshold){ // Start with default values Uint16 config = ADS1015_REG_CONFIG_CQUE_1CONV | // Comparator enabled and asserts on 1 match ADS1015_REG_CONFIG_CLAT_LATCH | // Latching mode ADS1015_REG_CONFIG_CPOL_ACTVLOW | // Alert/Rdy active low (default val) ADS1015_REG_CONFIG_CMODE_TRAD | // Traditional comparator (default val) ADS1015_REG_CONFIG_DR_1600SPS | // 1600 samples per second (default) ADS1015_REG_CONFIG_MODE_CONTIN | // Continuous conversion mode ADS1015_REG_CONFIG_MODE_CONTIN; // Continuous conversion mode // Set PGA/voltage range config |= m_gain; // Set single-ended input channel switch (channel) { case (0): config |= ADS1015_REG_CONFIG_MUX_SINGLE_0; break; case (1): config |= ADS1015_REG_CONFIG_MUX_SINGLE_1; break; case (2): config |= ADS1015_REG_CONFIG_MUX_SINGLE_2; break; case (3): config |= ADS1015_REG_CONFIG_MUX_SINGLE_3; break; } // Set the high threshold register // Shift 12-bit results left 4 bits for the ADS1015 writeRegister(m_i2cAddress, ADS1015_REG_POINTER_HITHRESH, threshold << m_bitShift); // Write config register to the ADC writeRegister(m_i2cAddress, ADS1015_REG_POINTER_CONFIG, config);}/**************************************************************************//*! @brief In order to clear the comparator, we need to read the conversion results. This function reads the last conversion results without changing the config value.*//**************************************************************************/int16_t getLastConversionResults(void){ Uint16 res; // Wait for the conversion to complete DELAY_US(m_conversionDelay); // Read the conversion results res = readRegister(m_i2cAddress, ADS1015_REG_POINTER_CONVERT) >> m_bitShift; if (m_bitShift == 0) { return (int16)res; } else { // Shift 12-bit results right 4 bits for the ADS1015, // making sure we keep the sign bit intact if (res > 0x07FF) { // negative number - extend the sign to 16th bit res |= 0xF000; } return (int16)res; }}#endifADS1015.h
/**************************************************************************//*! @file Adafruit_ADS1015.h @author K. Townsend (Adafruit Industries) @license BSD (see license.txt) This is a library for the Adafruit ADS1015 breakout board ----> https://www.adafruit.com/products/??? Adafruit invests time and resources providing this open source code, please support Adafruit and open-source hardware by purchasing products from Adafruit! @section HISTORY v1.0 - First release v1.1 - Added ADS1115 support - W. Earl*//**************************************************************************/#ifndef _ADS_1015_H_#define _ADS_1015_H_/*========================================================================= I2C ADDRESS/BITS -----------------------------------------------------------------------*/#define ADS1015_ADDRESS (0x90) // 1001 000 (ADDR = GND)/*=========================================================================*//*========================================================================= CONVERSION DELAY (in uS) -----------------------------------------------------------------------*/#define ADS1015_CONVERSIONDELAY (10)#define ADS1115_CONVERSIONDELAY (8)/*=========================================================================*//*========================================================================= POINTER REGISTER -----------------------------------------------------------------------*/#define ADS1015_REG_POINTER_MASK (0x03)#define ADS1015_REG_POINTER_CONVERT (0x00)#define ADS1015_REG_POINTER_CONFIG (0x01)#define ADS1015_REG_POINTER_LOWTHRESH (0x02)#define ADS1015_REG_POINTER_HITHRESH (0x03)/*=========================================================================*//*========================================================================= CONFIG REGISTER -----------------------------------------------------------------------*/#define ADS1015_REG_CONFIG_OS_MASK (0x8000)#define ADS1015_REG_CONFIG_OS_SINGLE (0x8000) // Write: Set to start a single-conversion#define ADS1015_REG_CONFIG_OS_BUSY (0x0000) // Read: Bit = 0 when conversion is in progress#define ADS1015_REG_CONFIG_OS_NOTBUSY (0x8000) // Read: Bit = 1 when device is not performing a conversion#define ADS1015_REG_CONFIG_MUX_MASK (0x7000)#define ADS1015_REG_CONFIG_MUX_DIFF_0_1 (0x0000) // Differential P = AIN0, N = AIN1 (default)#define ADS1015_REG_CONFIG_MUX_DIFF_0_3 (0x1000) // Differential P = AIN0, N = AIN3#define ADS1015_REG_CONFIG_MUX_DIFF_1_3 (0x2000) // Differential P = AIN1, N = AIN3#define ADS1015_REG_CONFIG_MUX_DIFF_2_3 (0x3000) // Differential P = AIN2, N = AIN3#define ADS1015_REG_CONFIG_MUX_SINGLE_0 (0x4000) // Single-ended AIN0#define ADS1015_REG_CONFIG_MUX_SINGLE_1 (0x5000) // Single-ended AIN1#define ADS1015_REG_CONFIG_MUX_SINGLE_2 (0x6000) // Single-ended AIN2#define ADS1015_REG_CONFIG_MUX_SINGLE_3 (0x7000) // Single-ended AIN3#define ADS1015_REG_CONFIG_PGA_MASK (0x0E00)#define ADS1015_REG_CONFIG_PGA_6_144V (0x0000) // +/-6.144V range = Gain 2/3#define ADS1015_REG_CONFIG_PGA_4_096V (0x0200) // +/-4.096V range = Gain 1#define ADS1015_REG_CONFIG_PGA_2_048V (0x0400) // +/-2.048V range = Gain 2 (default)#define ADS1015_REG_CONFIG_PGA_1_024V (0x0600) // +/-1.024V range = Gain 4#define ADS1015_REG_CONFIG_PGA_0_512V (0x0800) // +/-0.512V range = Gain 8#define ADS1015_REG_CONFIG_PGA_0_256V (0x0A00) // +/-0.256V range = Gain 16#define ADS1015_REG_CONFIG_MODE_MASK (0x0100)#define ADS1015_REG_CONFIG_MODE_CONTIN (0x0000) // Continuous conversion mode#define ADS1015_REG_CONFIG_MODE_SINGLE (0x0100) // Power-down single-shot mode (default)#define ADS1015_REG_CONFIG_DR_MASK (0x00E0)#define ADS1015_REG_CONFIG_DR_128SPS (0x0000) // 128 samples per second#define ADS1015_REG_CONFIG_DR_250SPS (0x0020) // 250 samples per second#define ADS1015_REG_CONFIG_DR_490SPS (0x0040) // 490 samples per second#define ADS1015_REG_CONFIG_DR_920SPS (0x0060) // 920 samples per second#define ADS1015_REG_CONFIG_DR_1600SPS (0x0080) // 1600 samples per second (default)#define ADS1015_REG_CONFIG_DR_2400SPS (0x00A0) // 2400 samples per second#define ADS1015_REG_CONFIG_DR_3300SPS (0x00C0) // 3300 samples per second#define ADS1015_REG_CONFIG_CMODE_MASK (0x0010)#define ADS1015_REG_CONFIG_CMODE_TRAD (0x0000) // Traditional comparator with hysteresis (default)#define ADS1015_REG_CONFIG_CMODE_WINDOW (0x0010) // Window comparator#define ADS1015_REG_CONFIG_CPOL_MASK (0x0008)#define ADS1015_REG_CONFIG_CPOL_ACTVLOW (0x0000) // ALERT/RDY pin is low when active (default)#define ADS1015_REG_CONFIG_CPOL_ACTVHI (0x0008) // ALERT/RDY pin is high when active#define ADS1015_REG_CONFIG_CLAT_MASK (0x0004) // Determines if ALERT/RDY pin latches once asserted#define ADS1015_REG_CONFIG_CLAT_NONLAT (0x0000) // Non-latching comparator (default)#define ADS1015_REG_CONFIG_CLAT_LATCH (0x0004) // Latching comparator#define ADS1015_REG_CONFIG_CQUE_MASK (0x0003)#define ADS1015_REG_CONFIG_CQUE_1CONV (0x0000) // Assert ALERT/RDY after one conversions#define ADS1015_REG_CONFIG_CQUE_2CONV (0x0001) // Assert ALERT/RDY after two conversions#define ADS1015_REG_CONFIG_CQUE_4CONV (0x0002) // Assert ALERT/RDY after four conversions#define ADS1015_REG_CONFIG_CQUE_NONE (0x0003) // Disable the comparator and put ALERT/RDY in high state (default)/*=========================================================================*/typedef enum{ GAIN_TWOTHIRDS = ADS1015_REG_CONFIG_PGA_6_144V, GAIN_ONE = ADS1015_REG_CONFIG_PGA_4_096V, GAIN_TWO = ADS1015_REG_CONFIG_PGA_2_048V, GAIN_FOUR = ADS1015_REG_CONFIG_PGA_1_024V, GAIN_EIGHT = ADS1015_REG_CONFIG_PGA_0_512V, GAIN_SIXTEEN = ADS1015_REG_CONFIG_PGA_0_256V} adsGain_t;extern void ads1015_init(void);extern Uint16 readADC_SingleEnded(Uint16 channel);extern void get_adc(volatile Uint16 *res0, volatile Uint16 *res1);#endifi2c
static void IIC_Delay(void){ DELAY_US(1);}static void IIC_Delay_Half(void){ DELAY_US(1);}static Uint16 IsCharOne(void){ Uint16 retcode = 0; if (SDA_IN()) { retcode = 1; } return retcode;}static void StartRom(void){ SET_SDA_OUT(); SET_SCL_OUT(); SetSDA(); IIC_Delay(); SetSCL(); IIC_Delay(); ClrSDA(); IIC_Delay(); ClrSCL(); IIC_Delay(); }static void StopRom(void){ ClrSDA(); IIC_Delay(); SetSCL(); IIC_Delay(); SetSDA(); IIC_Delay(); ClrSCL(); IIC_Delay();}static Uint16 SendToRom(Uint16 data){ Uint16 count, retcode = 0; for (count = 0; count < 8; count++) { if ((data & BIT7) == BIT7) { SetSDA(); } else { ClrSDA(); } IIC_Delay(); SetSCL(); data = data << 1; IIC_Delay(); ClrSCL(); //IIC_Delay(); } SET_SDA_IN(); IIC_Delay(); SetSCL(); //IIC_Delay(); IIC_Delay_Half(); retcode = IsCharOne(); IIC_Delay_Half(); //IIC_Delay(); ClrSCL(); IIC_Delay(); SET_SDA_OUT(); return retcode;}static Uint16 ReceiveFromRom(void){ Uint16 m = 0, count; SET_SDA_IN(); IIC_Delay(); for (count = 0; count < 8; count++) { m = m << 1; SetSCL(); //IIC_Delay(); //DELAY_US(3); IIC_Delay_Half(); if (IsCharOne()) { m |= BIT0; } //IIC_Delay(); //DELAY_US(2); IIC_Delay_Half(); ClrSCL(); IIC_Delay(); } SET_SDA_OUT(); return m;}static void mack(void){ ClrSDA(); IIC_Delay(); SetSCL(); IIC_Delay(); ClrSCL(); IIC_Delay();}static void nmack(void){ SetSDA(); IIC_Delay(); SetSCL(); IIC_Delay(); ClrSCL(); IIC_Delay();}void writeRegister(Uint16 i2cAddress, Uint16 reg, Uint16 value) { Uint16 i; EALLOW; for(i = 0; i < ADS_RE_COUNT; i++) { StopRom(); //IIC_Delay(); IIC_Delay(); StartRom(); if(SendToRom(i2cAddress) == 1) continue; if(SendToRom(reg&0xFF) == 1) continue; if(SendToRom(value>>8) == 1) continue; if(SendToRom(value&0xFF) == 1) continue; break; } StopRom(); IIC_Delay(); EDIS; //return i;}Uint16 readRegister(Uint16 i2cAddress, Uint16 reg) { Uint16 i, ret; EALLOW; for(i = 0; i < ADS_RE_COUNT; i++) { StopRom(); IIC_Delay(); StartRom(); if(SendToRom(i2cAddress) == 1) continue; if(SendToRom(ADS1015_REG_POINTER_CONVERT) == 1) continue; StopRom(); IIC_Delay(); StartRom(); if(SendToRom(i2cAddress|BIT0) == 1) continue; ret = ReceiveFromRom() << 8; mack(); ret |= ReceiveFromRom(); mack(); break; } StopRom(); IIC_Delay(); EDIS; return ret; }做个备份以后遇到底层的东西就可以省的心了
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