jaewook shin
SCH MME NIBP ref. code
Diff: ADS1115.h
- Revision:
- 0:8edd7b830280
- Child:
- 1:63bc0088a8ed
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/ADS1115.h Mon Nov 09 00:33:42 2020 +0000
@@ -0,0 +1,169 @@
+#include <mbed.h>
+
+/*=========================================================================
+ I2C ADDRESS/BITS
+ -----------------------------------------------------------------------*/
+ #define ADS1115_ADDRESS (0x49) // 100 1001 (ADDR = VDD)
+/*=========================================================================*/
+
+/*=========================================================================
+ CONVERSION DELAY (in mS)
+ -----------------------------------------------------------------------*/
+ #define ADS1115_CONVERSIONDELAY (8)
+/*=========================================================================*/
+
+/*=========================================================================
+ POINTER REGISTER
+ -----------------------------------------------------------------------*/
+ #define ADS1115_REG_POINTER_MASK (0x03)
+ #define ADS1115_REG_POINTER_CONVERT (0x00)
+ #define ADS1115_REG_POINTER_CONFIG (0x01)
+ #define ADS1115_REG_POINTER_LOWTHRESH (0x02)
+ #define ADS1115_REG_POINTER_HITHRESH (0x03)
+/*=========================================================================*/
+
+/*=========================================================================
+ CONFIG REGISTER
+ -----------------------------------------------------------------------*/
+ #define ADS1115_REG_CONFIG_OS_MASK (0x8000)
+ #define ADS1115_REG_CONFIG_OS_SINGLE (0x8000) // Write: Set to start a single-conversion
+ #define ADS1115_REG_CONFIG_OS_BUSY (0x0000) // Read: Bit = 0 when conversion is in progress
+ #define ADS1115_REG_CONFIG_OS_NOTBUSY (0x8000) // Read: Bit = 1 when device is not performing a conversion
+
+ #define ADS1115_REG_CONFIG_MUX_MASK (0x7000)
+ #define ADS1115_REG_CONFIG_MUX_DIFF_0_1 (0x0000) // Differential P = AIN0, N = AIN1 (default)
+ #define ADS1115_REG_CONFIG_MUX_DIFF_0_3 (0x1000) // Differential P = AIN0, N = AIN3
+ #define ADS1115_REG_CONFIG_MUX_DIFF_1_3 (0x2000) // Differential P = AIN1, N = AIN3
+ #define ADS1115_REG_CONFIG_MUX_DIFF_2_3 (0x3000) // Differential P = AIN2, N = AIN3
+ #define ADS1115_REG_CONFIG_MUX_SINGLE_0 (0x4000) // Single-ended AIN0
+ #define ADS1115_REG_CONFIG_MUX_SINGLE_1 (0x5000) // Single-ended AIN1
+ #define ADS1115_REG_CONFIG_MUX_SINGLE_2 (0x6000) // Single-ended AIN2
+ #define ADS1115_REG_CONFIG_MUX_SINGLE_3 (0x7000) // Single-ended AIN3
+
+ #define ADS1115_REG_CONFIG_PGA_MASK (0x0E00)
+ #define ADS1115_REG_CONFIG_PGA_6_144V (0x0000) // +/-6.144V range = Gain 2/3
+ #define ADS1115_REG_CONFIG_PGA_4_096V (0x0200) // +/-4.096V range = Gain 1
+ #define ADS1115_REG_CONFIG_PGA_2_048V (0x0400) // +/-2.048V range = Gain 2 (default)
+ #define ADS1115_REG_CONFIG_PGA_1_024V (0x0600) // +/-1.024V range = Gain 4
+ #define ADS1115_REG_CONFIG_PGA_0_512V (0x0800) // +/-0.512V range = Gain 8
+ #define ADS1115_REG_CONFIG_PGA_0_256V (0x0A00) // +/-0.256V range = Gain 16
+
+ #define ADS1115_REG_CONFIG_MODE_MASK (0x0100)
+ #define ADS1115_REG_CONFIG_MODE_CONTIN (0x0000) // Continuous conversion mode
+ #define ADS1115_REG_CONFIG_MODE_SINGLE (0x0100) // Power-down single-shot mode (default)
+
+ #define ADS1115_REG_CONFIG_DR_MASK (0x00E0)
+ #define ADS1115_REG_CONFIG_DR_8SPS (0x0000) // 8SPS
+ #define ADS1115_REG_CONFIG_DR_16SPS (0x0020) // 16SPS
+ #define ADS1115_REG_CONFIG_DR_32SPS (0x0040) // 32SPS
+ #define ADS1115_REG_CONFIG_DR_64SPS (0x0060) // 64SPS
+ #define ADS1115_REG_CONFIG_DR_128SPS (0x0080) // 128SPS (default)
+ #define ADS1115_REG_CONFIG_DR_475SPS (0x00A0) // 475SPS
+ #define ADS1115_REG_CONFIG_DR_860SPS (0x00C0) // 860SPS
+
+ #define ADS1115_REG_CONFIG_CMODE_MASK (0x0010)
+ #define ADS1115_REG_CONFIG_CMODE_TRAD (0x0000) // Traditional comparator with hysteresis (default)
+ #define ADS1115_REG_CONFIG_CMODE_WINDOW (0x0010) // Window comparator
+
+ #define ADS1115_REG_CONFIG_CPOL_MASK (0x0008)
+ #define ADS1115_REG_CONFIG_CPOL_ACTVLOW (0x0000) // ALERT/RDY pin is low when active (default)
+ #define ADS1115_REG_CONFIG_CPOL_ACTVHI (0x0008) // ALERT/RDY pin is high when active
+
+ #define ADS1115_REG_CONFIG_CLAT_MASK (0x0004) // Determines if ALERT/RDY pin latches once asserted
+ #define ADS1115_REG_CONFIG_CLAT_NONLAT (0x0000) // Non-latching comparator (default)
+ #define ADS1115_REG_CONFIG_CLAT_LATCH (0x0004) // Latching comparator
+
+ #define ADS1115_REG_CONFIG_CQUE_MASK (0x0003)
+ #define ADS1115_REG_CONFIG_CQUE_1CONV (0x0000) // Assert ALERT/RDY after one conversions
+ #define ADS1115_REG_CONFIG_CQUE_2CONV (0x0001) // Assert ALERT/RDY after two conversions
+ #define ADS1115_REG_CONFIG_CQUE_4CONV (0x0002) // Assert ALERT/RDY after four conversions
+ #define ADS1115_REG_CONFIG_CQUE_NONE (0x0003) // Disable the comparator and put ALERT/RDY in high state (default)
+/*=========================================================================*/
+
+typedef enum {
+ GAIN_TWOTHIRDS = ADS1115_REG_CONFIG_PGA_6_144V,
+ GAIN_ONE = ADS1115_REG_CONFIG_PGA_4_096V,
+ GAIN_TWO = ADS1115_REG_CONFIG_PGA_2_048V,
+ GAIN_FOUR = ADS1115_REG_CONFIG_PGA_1_024V,
+ GAIN_EIGHT = ADS1115_REG_CONFIG_PGA_0_512V,
+ GAIN_SIXTEEN = ADS1115_REG_CONFIG_PGA_0_256V
+} adsGain_t;
+
+uint8_t m_i2cAddress;
+uint8_t m_conversionDelay;
+uint8_t m_bitShift;
+adsGain_t m_gain;
+I2C* m_i2c;
+
+void ADS1115_Init(I2C* i2c, uint8_t i2cAddress)
+{
+ // shift 7 bit address 1 left: read expects 8 bit address, see I2C.h
+ m_i2cAddress = i2cAddress << 1;
+ m_conversionDelay = ADS1115_CONVERSIONDELAY;
+ m_gain = GAIN_TWOTHIRDS; /* +/- 6.144V range (limited to VDD +0.3V max!) */
+ m_i2c = i2c;
+}
+
+uint16_t ADS1115_readRegister(uint8_t i2cAddress, uint8_t reg)
+{
+ char data[2];
+ data[0] = reg; // temporary use this to send address to conversion register
+ m_i2c->write(i2cAddress, data, 1);
+ m_i2c->read(i2cAddress, data, 2);
+ return (data[0] << 8 | data [1]);
+}
+
+void ADS1115_writeRegister(uint8_t i2cAddress, uint8_t reg, uint16_t value)
+{
+ char cmd[3];
+ cmd[0] = (char)reg;
+ cmd[1] = (char)(value>>8);
+ cmd[2] = (char)(value & 0xFF);
+ m_i2c->write(i2cAddress, cmd, 3);
+}
+
+
+uint16_t ADS1115_setConti_ADC_SingleEnded(uint8_t channel)
+{
+ if (channel > 3) {
+ return 0;
+ }
+
+ // Start with default values
+ uint16_t config = ADS1115_REG_CONFIG_CQUE_1CONV | // Assert ALERT/RDY after one conversions
+ ADS1115_REG_CONFIG_CLAT_NONLAT | // Non-latching (default val)
+ ADS1115_REG_CONFIG_CPOL_ACTVLOW | // Alert/Rdy active low (default val)
+ ADS1115_REG_CONFIG_CMODE_TRAD | // Traditional comparator (default val)
+ ADS1115_REG_CONFIG_DR_475SPS | // 475SPS
+ ADS1115_REG_CONFIG_MODE_CONTIN; // Countinuous-conversion mode
+
+ // Set PGA/voltage range
+ config |= m_gain;
+
+ // Set single-ended input channel
+ switch (channel) {
+ case (0):
+ config |= ADS1115_REG_CONFIG_MUX_SINGLE_0;
+ break;
+ case (1):
+ config |= ADS1115_REG_CONFIG_MUX_SINGLE_1;
+ break;
+ case (2):
+ config |= ADS1115_REG_CONFIG_MUX_SINGLE_2;
+ break;
+ case (3):
+ config |= ADS1115_REG_CONFIG_MUX_SINGLE_3;
+ break;
+ }
+ ADS1115_writeRegister(m_i2cAddress, ADS1115_REG_POINTER_LOWTHRESH, 0x7fff);
+ ADS1115_writeRegister(m_i2cAddress, ADS1115_REG_POINTER_HITHRESH, 0x8000);
+ ADS1115_writeRegister(m_i2cAddress, ADS1115_REG_POINTER_CONFIG, config);
+
+ return 0;
+}
+
+int16_t ADS1115_getConti_ADC_SingleEnded()
+{
+ uint16_t res = ADS1115_readRegister(m_i2cAddress, ADS1115_REG_POINTER_CONVERT);
+ return (int16_t)res;
+}
\ No newline at end of file