Ads1015 Class Reference

#include <ads1015.h>

Collaboration diagram for Ads1015:

Public Member Functions
bool	init (brain_pin_e scl, brain_pin_e sda)
void	readChannels (float(&result)[4])

Private Member Functions
float	readChannel (uint8_t ch)
void	writeReg (uint8_t reg, uint16_t data)
uint16_t	readReg (uint8_t reg)

Private Attributes
bool	m_hasInit = false
BitbangI2c	m_i2c

Detailed Description

Definition at line 5 of file ads1015.h.

Member Function Documentation

init()

bool Ads1015::init	(	brain_pin_e	scl,
		brain_pin_e	sda
	)

Definition at line 21 of file ads1015.cpp.

                                                   {
    if (!m_i2c.init(scl, sda)) {
        return false;
    }
 
    // ADS1015 has no ID register - so we read the Lo_thresh instead
    uint16_t loThresh = readReg(ADS1015_LO_THRESH);
 
    if (loThresh != 0x8000) {
        return false;
    }
 
    m_hasInit = true;
    return true;
}

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readChannel()

float Ads1015::readChannel ( uint8_t  ch )

private

Definition at line 43 of file ads1015.cpp.

                                          {
    // set the channel
    // set to +-6.144v full scale, fastest sampling, manual conversion start
    writeReg(ADS1015_CONFIG, 0xC1E0 | channel << 12);
 
    // Wait for conversion to complete
    // Bit is cleared while conversion is ongoing, set when done
    while ((readReg(ADS1015_CONFIG) & 0x8000) == 0) ;
 
    // Read the result
    int16_t result = readReg(ADS1015_CONV);
    // Result is 12 bits left aligned, so right align the result
    result = result >> 4;
 
    // 2048 counts = positive 6.144 volts
    constexpr float ratio = 6.144f / 2048;
    return result * ratio;
}

Referenced by readChannels().

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readChannels()

void Ads1015::readChannels

(

float(&)

result[4]

)

Definition at line 37 of file ads1015.cpp.

                                             {
    for (size_t i = 0; i < 4; i++) {
        result[i] = readChannel(i);
    }
}

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readReg()

uint16_t Ads1015::readReg ( uint8_t  reg )

private

Definition at line 72 of file ads1015.cpp.

                                     {
    uint16_t res;
    m_i2c.write(addr, &reg, 1);
    m_i2c.read(addr, reinterpret_cast<uint8_t*>(&res), 2);
    return SWAP_UINT16(res);
}

Referenced by init(), and readChannel().

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writeReg()

void Ads1015::writeReg ( uint8_t  reg, uint16_t  data  )

private

Definition at line 62 of file ads1015.cpp.

                                                 {
    uint8_t packet[3];
 
    packet[0] = reg;
    packet[1] = data >> 8;
    packet[2] = data & 0xFF;
 
    m_i2c.write(addr, packet, 3);
}

Referenced by readChannel().

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Field Documentation

m_hasInit

bool Ads1015::m_hasInit = false

private

Definition at line 16 of file ads1015.h.

Referenced by init().

m_i2c

BitbangI2c Ads1015::m_i2c

private

Definition at line 17 of file ads1015.h.

Referenced by init(), readReg(), and writeReg().

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The documentation for this class was generated from the following files:

• hw_layer/drivers/adc/ads1015.h
• hw_layer/drivers/adc/ads1015.cpp