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/*
* Xytronic LF-1600
* Settings handling
*
* Copyright (c) 2015-2016 Michael Buesch <m@bues.ch>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "settings.h"
#include "util.h"
#include "timer.h"
#include "controller_temp.h"
#include "presets.h"
#include "ring.h"
#include <string.h>
#include <avr/eeprom.h>
struct settings_context {
struct timer store_timer;
bool store_request;
struct settings cache;
uint8_t ee_index;
uint8_t ee_write_offset;
};
static struct settings_context settings;
/* The permanent EEPROM storage. */
#define NR_EE_SETTINGS ((E2END + 1) / sizeof(struct settings))
static struct settings EEMEM ee_settings[NR_EE_SETTINGS] = {
[0 ... NR_EE_SETTINGS - 1] = {
.temp_k[TEMPBOOST_NORMAL] = {
.kp = FLOAT_TO_FIXPT(CONTRTEMP_PID_KP_NORMAL),
.ki = FLOAT_TO_FIXPT(CONTRTEMP_PID_KI_NORMAL),
.kd = FLOAT_TO_FIXPT(CONTRTEMP_PID_KD_NORMAL),
.d_decay_div = FLOAT_TO_FIXPT(CONTRTEMP_PID_D_DECAY_NORMAL),
},
#if CONF_BOOST
.temp_k[TEMPBOOST_BOOST1] = {
.kp = FLOAT_TO_FIXPT(CONTRTEMP_PID_KP_BOOST1),
.ki = FLOAT_TO_FIXPT(CONTRTEMP_PID_KI_BOOST1),
.kd = FLOAT_TO_FIXPT(CONTRTEMP_PID_KD_BOOST1),
.d_decay_div = FLOAT_TO_FIXPT(CONTRTEMP_PID_D_DECAY_BOOST1),
},
.temp_k[TEMPBOOST_BOOST2] = {
.kp = FLOAT_TO_FIXPT(CONTRTEMP_PID_KP_BOOST2),
.ki = FLOAT_TO_FIXPT(CONTRTEMP_PID_KI_BOOST2),
.kd = FLOAT_TO_FIXPT(CONTRTEMP_PID_KD_BOOST2),
.d_decay_div = FLOAT_TO_FIXPT(CONTRTEMP_PID_D_DECAY_BOOST2),
},
#endif
.temp_setpoint[0] = FLOAT_TO_FIXPT(PRESET_DEFAULT0),
#if CONF_PRESETS
.temp_setpoint[1] = FLOAT_TO_FIXPT(PRESET_DEFAULT1),
.temp_setpoint[2] = FLOAT_TO_FIXPT(PRESET_DEFAULT2),
#endif
.temp_setpoint_active = PRESET_DEFAULT_INDEX,
#if CONF_IDLE
.temp_idle_setpoint = FLOAT_TO_FIXPT(CONTRTEMP_DEF_IDLE_SETPOINT),
#endif
.serial = 0,
},
};
static uint8_t ee_read_byte(uint16_t addr)
{
uint8_t sreg, data;
sreg = irq_disable_save();
eeprom_busy_wait();
EEAR = addr;
EECR |= (1 << EERE);
data = EEDR;
irq_restore(sreg);
return data;
}
static void ee_read_block(void *dest, uint16_t addr, uint8_t count)
{
uint8_t *d = dest;
for ( ; count; count--, d++, addr++)
*d = ee_read_byte(addr);
}
ISR(EE_READY_vect)
{
uint16_t address;
uint8_t data;
uint8_t index, offset;
index = settings.ee_index;
offset = settings.ee_write_offset;
address = (uint16_t)((uint8_t *)&ee_settings[index] + offset);
data = *((uint8_t *)&settings.cache + offset);
EEAR = address;
/* Read the byte. */
EECR |= (1 << EERE);
if (EEDR == data) {
/* The data in EEPROM matches the data to be written.
* No write is needed.
* This interrupt will trigger again immediately.
*/
} else {
/* Start programming of the byte.
* This interrupt will trigger again when programming finished.
*/
EEDR = data;
EECR |= (1 << EEMPE);
EECR |= (1 << EEPE);
}
offset++;
settings.ee_write_offset = offset;
if (offset >= sizeof(struct settings)) {
/* Done writing. Disable the interrupt. */
EECR &= (uint8_t)~(1 << EERIE);
}
}
struct settings * get_settings(void)
{
return &settings.cache;
}
void store_settings(void)
{
settings.store_request = true;
timer_arm(&settings.store_timer, 1000);
}
void settings_work(void)
{
uint8_t sreg;
if (!settings.store_request)
return;
if (!timer_expired(&settings.store_timer))
return;
settings.store_request = false;
/* Increment the serial number. This might wrap. */
settings.cache.serial++;
sreg = irq_disable_save();
/* Increment the store index. */
settings.ee_index = ring_next(settings.ee_index,
ARRAY_SIZE(ee_settings) - 1u);
/* Reset the store byte offset. */
settings.ee_write_offset = 0;
/* Enable the eeprom-ready interrupt.
* It will fire, if the EEPROM is ready.
*/
EECR |= (1 << EERIE);
irq_restore(sreg);
}
void settings_init(void)
{
uint8_t next_index, found_index;
uint8_t serial, next_serial;
build_assert(sizeof(struct settings) == 64);
build_assert(SEA_SIZE(struct settings, temp_k) >= NR_BOOST_MODES);
build_assert(SEA_SIZE(struct settings, temp_setpoint) >= NR_PRESETS);
/* Find the latest settings in the eeprom.
* The latest setting is the one with the largest
* index. However, wrap around must be considered.
*/
serial = ee_read_byte((uint16_t)&ee_settings[0].serial);
next_index = 0;
do {
found_index = next_index;
next_index = ring_next(next_index, ARRAY_SIZE(ee_settings) + 1u);
next_serial = ee_read_byte((uint16_t)&ee_settings[next_index].serial);
if (next_serial != ((serial + 1u) & 0xFFu))
break;
serial = next_serial;
} while (next_index != 0);
settings.ee_index = found_index;
/* Read settings from EEPROM. */
ee_read_block(&settings.cache,
(uint16_t)&ee_settings[found_index],
sizeof(settings.cache));
}
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