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/*
* Copyright 2023 Birte Kristina Friesel
*
* SPDX-License-Identifier: BSD-2-Clause
*
* Driver for ADS111x 16-Bit ADCs
*/
#include "driver/ads111x.h"
#if defined(CONFIG_meta_driver_hardware_i2c)
#include "driver/i2c.h"
#elif defined(CONFIG_driver_softi2c)
#include "driver/soft_i2c.h"
#endif
void ADS111x::configure(unsigned short config)
{
txbuf[0] = P_CONFIG;
txbuf[1] = config >> 8;
txbuf[2] = config & 0x00ff;
i2c.xmit(address, 3, txbuf, 0, rxbuf);
uint8_t pga_config = (config & CONF_PGA_MASK) >> CONF_PGA_OFFSET;
switch (pga_config) {
case 0:
fsr_scale = 24;
break;
case 1:
fsr_scale = 16;
break;
case 2:
fsr_scale = 8;
break;
case 3:
fsr_scale = 4;
break;
case 4:
fsr_scale = 2;
break;
default:
fsr_scale = 1;
}
}
int16_t ADS111x::readRaw()
{
txbuf[0] = P_CONVERSION;
i2c.xmit(address, 1, txbuf, 2, rxbuf);
int16_t intermediate = ((int8_t)rxbuf[0]) * 256 + (uint8_t) rxbuf[1];
return intermediate;
}
float ADS111x::readVoltage()
{
return readRaw() * 0.256 / 0x7fff * fsr_scale;
}
ADS111x ads111x(0x48);
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