BAP TUDelft / ADS1015_v2

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ADS1015.cpp

Committer:
xorjoep
Date:
2018-06-26
Revision:
0:94493b8b0fb0
Child:
1:c1ddf7c2d65b

File content as of revision 0:94493b8b0fb0:

#include "mbed.h"
#include "ADS1015.h"

void startSingleShotConversion(I2C* i2c_plate, uint8_t address, uint16_t config)
{
    char txbuf[10];
    // set mux to correct input
    txbuf[0] = AD1015_REG_CONFIG;
    txbuf[1] = config >> 8;
    txbuf[2] = config & 0xFF;
    i2c_plate->write(address, txbuf, 3);
}

double readConversionResult(I2C* i2c_plate, uint8_t address, uint16_t config)
{
    int16_t raw_data;
    char rxbuf[10];
    char txbuf[10];
    txbuf[0] = AD1015_REG_CONVERSION_RESULT;
    i2c_plate->write(address, txbuf, 1, true);
    i2c_plate->read(address, rxbuf, 2);
    raw_data = (rxbuf[0] << 8) | rxbuf[1];
    return data_to_voltage(raw_data, config);
}

double data_to_voltage(int16_t data, uint16_t config)
{
    double voltage;
    data = data >> 4;
    switch(config & 0x0E00) {
        case AD1015_CONFIG_FSR_6144:
            voltage = 0.003 * (double)data;
            break;
        case AD1015_CONFIG_FSR_4096:
            voltage = 0.002 * (double)data;
            break;
        case AD1015_CONFIG_FSR_2048:
            voltage = 0.001 * (double)data;
            break;
        case AD1015_CONFIG_FSR_1024:
            voltage = 0.0005 * (double)data;
            break;
        case AD1015_CONFIG_FSR_0512:
            voltage = 0.00025 * (double)data;
            break;
        case AD1015_CONFIG_FSR_0256:
            voltage = 0.000125 * (double)data;
            break;
        default:
            break;
    }
    return voltage;
}