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/*
* The MIT License (MIT)
*
* Copyright (c) 2020 Matthias P. Braendli, Maximilien Cuony
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "Core/common.h"
#include "GPIO/batterycharge.h"
#include "FreeRTOS.h"
#include "task.h"
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
// Hysteresis:
#define CHARGE_QRP 1300000
#define CHARGE_QRO 1350000
// If last message older than that, consider the coulomb-counter broken
#define MAX_MESSAGE_AGE 60 // seconds
static uint64_t timestamp_last_message;
static int breaker_valid;
static int breaker_is_open;
static int charge_valid;
static uint32_t last_charge;
static int charge_qrp;
static void reset(void)
{
breaker_valid = 0;
breaker_is_open = -1;
charge_valid = 0;
last_charge = 0;
charge_qrp = 0;
}
static void check_timestamp(void)
{
const uint64_t now = timestamp_now();
if (timestamp_last_message + MAX_MESSAGE_AGE * 1000 < now) {
reset();
}
}
void batterycharge_init()
{
/* No need to protect the variables, this is called at init before the
* tasks get created.
*/
timestamp_last_message = 0;
reset();
}
void batterycharge_push_message(const char *ccounter_msg)
{
const uint64_t ts = timestamp_now();
const int is_capa = strncmp(ccounter_msg, "CAPA", 4) == 0;
const int is_eol = strncmp(ccounter_msg, "DISJEOL", 7) == 0;
/* We ignore TEXT, ERROR, VBAT+ and VBAT- for the moment, and only parse CAPA.
* The \r\n has been trimmed off the message already, therefore the value
* should extend until the end of string.
*/
if (is_capa || is_eol) {
size_t ix_value = 0;
int second_found = 0;
for (size_t ix = 0; ccounter_msg[ix] != '\0'; ix++) {
if (ccounter_msg[ix] == ',') {
if (! second_found) {
second_found = 1;
}
else {
ix_value = ix + 1;
}
}
}
const char *valuestr = ccounter_msg + ix_value;
if (is_capa) {
/* Field is the capacity in mAh */
char *endptr;
errno = 0;
const uint32_t value = strtol(valuestr, &endptr, 10);
if (errno == 0 && endptr != valuestr) {
taskDISABLE_INTERRUPTS();
last_charge = value;
charge_valid = 1;
timestamp_last_message = ts;
taskENABLE_INTERRUPTS();
}
}
else if (is_eol) {
/* Field is either `On` or `Off` */
const int is_on = strncmp(valuestr, "On", 2) == 0;
const int is_off = strncmp(valuestr, "Off", 2) == 0;
taskDISABLE_INTERRUPTS();
if (is_on) {
breaker_valid = 1;
breaker_is_open = 0;
timestamp_last_message = ts;
}
else if (is_off) {
breaker_valid = 1;
breaker_is_open = 1;
timestamp_last_message = ts;
}
taskENABLE_INTERRUPTS();
}
}
}
uint32_t batterycharge_retrieve_last_capacity()
{
uint32_t ret = 0;
taskDISABLE_INTERRUPTS();
check_timestamp();
if (charge_valid) {
ret = last_charge;
}
taskENABLE_INTERRUPTS();
return ret;
}
int batterycharge_too_low()
{
uint32_t c = 0;
int b = -1;
taskDISABLE_INTERRUPTS();
check_timestamp();
if (charge_valid) {
c = last_charge;
}
if (breaker_valid) {
b = breaker_is_open;
}
taskENABLE_INTERRUPTS();
/* Disconnected wind generator implies QRP always */
if (b == 1) {
return 1;
}
else if (c == 0) {
return -1;
}
/* Implement hysteresis */
else if (charge_qrp == 0 && c < CHARGE_QRP) {
charge_qrp = 1;
}
else if (charge_qrp == 1 && c >= CHARGE_QRO) {
charge_qrp = 0;
}
return charge_qrp;
}
int batterycharge_wind_disconnected()
{
int b = -1;
taskDISABLE_INTERRUPTS();
check_timestamp();
if (breaker_valid) {
b = breaker_is_open;
}
taskENABLE_INTERRUPTS();
return b;
}
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