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/*
* This file is part of the bladeRF project:
* http://www.github.com/nuand/bladeRF
*
* Copyright (C) 2017 Nuand LLC
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <libbladeRF.h>
#include "log.h"
#include "ina219.h"
#define INA219_REG_CONFIGURATION 0x00
#define INA219_REG_SHUNT_VOLTAGE 0x01
#define INA219_REG_BUS_VOLTAGE 0x02
#define INA219_REG_POWER 0x03
#define INA219_REG_CURRENT 0x04
#define INA219_REG_CALIBRATION 0x05
int ina219_init(struct bladerf *dev, float r_shunt)
{
int status;
uint16_t value;
/* Soft-reset INA219 */
value = 0x8000;
status = dev->backend->ina219_write(dev, INA219_REG_CONFIGURATION, value);
if (status < 0) {
log_error("INA219 soft reset error: %d\n", status);
return status;
}
/* Poll until we're out of reset */
while (value & 0x8000) {
status = dev->backend->ina219_read(dev, INA219_REG_CONFIGURATION, &value);
if (status < 0) {
log_error("INA219 soft reset poll error: %d\n", status);
return status;
}
}
/* Write configuration register */
/* BRNG (13) = 0 for 16V FSR
PG (12-11) = 00 for 40mV
BADC (10-7) = 0011 for 12-bit / 532uS
SADC (6-3) = 0011 for 12-bit / 532uS
MODE (2-0) = 111 for continuous shunt & bus */
value = 0x019f;
status = dev->backend->ina219_write(dev, INA219_REG_CONFIGURATION, value);
if (status < 0) {
log_error("INA219 configuration error: %d\n", status);
return status;
}
log_debug("Configuration register: 0x%04x\n", value);
/* Write calibration register */
/* Current_LSB = 0.001 A / LSB */
/* Calibration = 0.04096 / (Current_LSB * r_shunt) */
value = (uint16_t)((0.04096 / (0.001 * r_shunt)) + 0.5);
status = dev->backend->ina219_write(dev, INA219_REG_CALIBRATION, value);
if (status < 0) {
log_error("INA219 calibration error: %d\n", status);
return status;
}
log_debug("Calibration register: 0x%04x\n", value);
return 0;
}
int ina219_read_shunt_voltage(struct bladerf *dev, float *voltage)
{
int status;
uint16_t data;
status = dev->backend->ina219_read(dev, INA219_REG_SHUNT_VOLTAGE, &data);
if (status < 0) {
return status;
}
/* Scale by 1e-5 LSB / Volt */
*voltage = ((float)((int16_t)data)) * 1e-5F;
return 0;
}
int ina219_read_bus_voltage(struct bladerf *dev, float *voltage)
{
int status;
uint16_t data;
status = dev->backend->ina219_read(dev, INA219_REG_BUS_VOLTAGE, &data);
if (status < 0) {
return status;
}
/* If overflow flag is set */
if (data & 0x1) {
return BLADERF_ERR_UNEXPECTED;
}
/* Scale by 0.004 LSB / Volt */
*voltage = ((float)(data >> 3)) * 0.004F;
return 0;
}
int ina219_read_current(struct bladerf *dev, float *current)
{
int status;
uint16_t data;
status = dev->backend->ina219_read(dev, INA219_REG_CURRENT, &data);
if (status < 0) {
return status;
}
/* Scale by 0.001 LSB / Ampere */
*current = ((float)((int16_t)data)) * 0.001F;
return 0;
}
int ina219_read_power(struct bladerf *dev, float *power)
{
int status;
uint16_t data;
status = dev->backend->ina219_read(dev, INA219_REG_POWER, &data);
if (status < 0) {
return status;
}
/* Scale by 0.020 LSB / Watt */
*power = ((float)((int16_t)data)) * 0.020F;
return 0;
}
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