SolarLader/LNSC-2420-Firmware
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Merge branch 'main' into bmp280

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This commit is contained in:
Thomas Kolb 2022-10-15 16:43:36 +02:00
parent 3dcf412a02 16619397b1
commit 055186180f
15 changed files with 513 additions and 133 deletions
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3
.gitignore vendored
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@ -4,3 +4,6 @@
# Vim swap files # Vim swap files
.*.sw? .*.sw?
# generated config HEX files
utils/*.hex

2
Makefile
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@ -32,7 +32,7 @@ LDFLAGS+=--static \
-nostartfiles -Wl,--gc-sections \ -nostartfiles -Wl,--gc-sections \
-mthumb -mcpu=cortex-m0 -mthumb -mfloat-abi=soft -mthumb -mcpu=cortex-m0 -mthumb -mfloat-abi=soft
# the LD script # the LD script (RAM-only does not work because the code is too large)
#LDFLAGS+=-Tldscripts/lnsc-2420-$(BUILD).ld #LDFLAGS+=-Tldscripts/lnsc-2420-$(BUILD).ld
LDFLAGS+=-Tldscripts/lnsc-2420-release.ld LDFLAGS+=-Tldscripts/lnsc-2420-release.ld

5
ldscripts/lnsc-2420-debug.ld
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@ -7,6 +7,7 @@
MEMORY MEMORY
{ {
/*rom (rx) : ORIGIN = 0x08000000, LENGTH = 64K*/ /*rom (rx) : ORIGIN = 0x08000000, LENGTH = 64K*/
conf (r) : ORIGIN = 0x08007c00, LENGTH = 1K
ram (rwx) : ORIGIN = 0x20000000, LENGTH = 4K ram (rwx) : ORIGIN = 0x20000000, LENGTH = 4K
} }
@ -96,6 +97,10 @@ SECTIONS
. = ALIGN(4); . = ALIGN(4);
end = .; end = .;
.conf : {
__conf_start = .;
} >conf
} }
PROVIDE(_stack = ORIGIN(ram) + LENGTH(ram)); PROVIDE(_stack = ORIGIN(ram) + LENGTH(ram));

10
ldscripts/lnsc-2420-release.ld
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@ -3,10 +3,18 @@
/* Define memory regions. */ /* Define memory regions. */
MEMORY MEMORY
{ {
rom (rx) : ORIGIN = 0x08000000, LENGTH = 32K rom (rx) : ORIGIN = 0x08000000, LENGTH = 31K
conf (r) : ORIGIN = 0x08007c00, LENGTH = 1K
ram (rwx) : ORIGIN = 0x20000000, LENGTH = 4K ram (rwx) : ORIGIN = 0x20000000, LENGTH = 4K
} }
/* Include the common ld script. */ /* Include the common ld script. */
INCLUDE cortex-m-generic.ld INCLUDE cortex-m-generic.ld
SECTIONS
{
.conf : {
__conf_start = .;
. = ALIGN(4);
} >conf
}

14
src/calibration.h
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@ -6,10 +6,24 @@
* than the actual voltage, you have to scale by 1.02 and therefore specify * than the actual voltage, you have to scale by 1.02 and therefore specify
* 1020 in this list. */ * 1020 in this list. */
/* Values for the device at the B26 tower */
#if 0
#define CAL_FACTOR_U_BAT 994 #define CAL_FACTOR_U_BAT 994
#define CAL_FACTOR_U_SOLAR 997 #define CAL_FACTOR_U_SOLAR 997
#define CAL_FACTOR_U_SW 996 #define CAL_FACTOR_U_SW 996
#define CAL_FACTOR_I_SOLAR 1015 #define CAL_FACTOR_I_SOLAR 1015
#define CAL_FACTOR_I_LOAD 1000 #define CAL_FACTOR_I_LOAD 1000
#endif
/* Values for the development device */
#if 1
#define CAL_FACTOR_U_BAT 1012
#define CAL_FACTOR_U_SOLAR 1015
#define CAL_FACTOR_U_SW 1006
#define CAL_FACTOR_I_SOLAR 3980
#define CAL_FACTOR_I_LOAD 1000
#endif
#endif // CALIBRATION_H #endif // CALIBRATION_H

40
src/charge_control.c
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@ -6,7 +6,7 @@
#include "measurement.h" #include "measurement.h"
#include "charge_pump.h" #include "charge_pump.h"
#include "rs485.h" #include "rs485.h"
#include "config.h" #include "flash_config.h"
#include "charge_control.h" #include "charge_control.h"
@ -92,9 +92,9 @@ static enum ChargeState control_solar_charging(
} }
// low-current limit (go to sleep at night) // low-current limit (go to sleep at night)
if((time_in_state > SLEEP_STATE_DELAY) if((time_in_state > FLASH_CONFIG_SLEEP_STATE_DELAY)
&& (current_switch_state == true) && (current_switch_state == true)
&& (solar_switch_onoff_duration > SLEEP_SWITCH_DELAY) && (solar_switch_onoff_duration > FLASH_CONFIG_SLEEP_SWITCH_DELAY)
&& (meas->avg_i_solar < sleep_solar_current)) { && (meas->avg_i_solar < sleep_solar_current)) {
return CHARGE_SLEEP; return CHARGE_SLEEP;
} }
@ -152,20 +152,20 @@ static void solar_fsm_update(uint64_t uptime_ms, struct MeasurementResult *meas)
} }
// time limit for initial hold charging // time limit for initial hold charging
if(charge_time_in_state > INITIAL_CHARGE_HOLD_TIME) { if(charge_time_in_state > FLASH_CONFIG_INITIAL_CHARGE_HOLD_TIME) {
charge_state = CHARGE_TRANSITION; charge_state = CHARGE_TRANSITION;
} }
break; break;
case CHARGE_TRANSITION: case CHARGE_TRANSITION:
if(charge_time_in_state < INITIAL_TO_FLOAT_TRANSITION_TIME) { if(charge_time_in_state < FLASH_CONFIG_INITIAL_TO_FLOAT_TRANSITION_TIME) {
// dynamically adjust thresholds // dynamically adjust thresholds
fxp_t u_bat_full = fxp_t u_bat_full =
fxp_add(u_bat_initial_full, fxp_add(u_bat_initial_full,
fxp_mult( fxp_mult(
fxp_sub(u_bat_float_full, u_bat_initial_full), fxp_sub(u_bat_float_full, u_bat_initial_full),
fxp_div(charge_time_in_state, INITIAL_TO_FLOAT_TRANSITION_TIME))); fxp_div(charge_time_in_state, FLASH_CONFIG_INITIAL_TO_FLOAT_TRANSITION_TIME)));
fxp_t u_bat_low = fxp_sub(u_bat_full, u_bat_regulation_corridor); fxp_t u_bat_low = fxp_sub(u_bat_full, u_bat_regulation_corridor);
@ -260,7 +260,7 @@ static void load_fsm_update(uint64_t uptime_ms, struct MeasurementResult *meas)
} }
if((meas->i_load > load_current_limit) if((meas->i_load > load_current_limit)
&& (discharge_time_in_state > LOAD_CURRENT_INRUSH_TIME)) { && (discharge_time_in_state > FLASH_CONFIG_LOAD_CURRENT_INRUSH_TIME)) {
discharge_state = DISCHARGE_OVERCURRENT; discharge_state = DISCHARGE_OVERCURRENT;
} }
@ -277,7 +277,7 @@ static void load_fsm_update(uint64_t uptime_ms, struct MeasurementResult *meas)
// Can only switch on again after a specific amount of time has passed // Can only switch on again after a specific amount of time has passed
if((meas->avg_u_bat > u_bat_load_on) if((meas->avg_u_bat > u_bat_load_on)
&& (discharge_time_in_state > LOAD_ON_DELAY)) { && (discharge_time_in_state > FLASH_CONFIG_LOAD_ON_DELAY)) {
discharge_state = DISCHARGE_OK; discharge_state = DISCHARGE_OK;
} }
break; break;
@ -307,30 +307,30 @@ void charge_control_init(void)
discharge_state_entered = true; discharge_state_entered = true;
/* calculate thresholds */ /* calculate thresholds */
u_bat_regulation_corridor = fxp_div(FXP_FROM_INT(U_BAT_REGULATION_CORRIDOR), u_bat_regulation_corridor = fxp_div(FXP_FROM_INT(FLASH_CONFIG_U_BAT_REGULATION_CORRIDOR),
FXP_FROM_INT(1000)); FXP_FROM_INT(1000));
u_bat_initial_full = fxp_div(FXP_FROM_INT(U_BAT_INITIAL_FULL), FXP_FROM_INT(1000)); u_bat_initial_full = fxp_div(FXP_FROM_INT(FLASH_CONFIG_U_BAT_INITIAL_FULL), FXP_FROM_INT(1000));
u_bat_initial_low = fxp_sub(u_bat_initial_full, u_bat_regulation_corridor); u_bat_initial_low = fxp_sub(u_bat_initial_full, u_bat_regulation_corridor);
u_bat_initial_hold_cancel = fxp_div(FXP_FROM_INT(U_BAT_INITIAL_HOLD_CANCEL), FXP_FROM_INT(1000)); u_bat_initial_hold_cancel = fxp_div(FXP_FROM_INT(FLASH_CONFIG_U_BAT_INITIAL_HOLD_CANCEL), FXP_FROM_INT(1000));
u_bat_float_full = fxp_div(FXP_FROM_INT(U_BAT_FLOAT_FULL), FXP_FROM_INT(1000)); u_bat_float_full = fxp_div(FXP_FROM_INT(FLASH_CONFIG_U_BAT_FLOAT_FULL), FXP_FROM_INT(1000));
u_bat_float_low = fxp_sub(u_bat_float_full, u_bat_regulation_corridor); u_bat_float_low = fxp_sub(u_bat_float_full, u_bat_regulation_corridor);
min_charge_pump_excess_voltage = fxp_div(FXP_FROM_INT(MIN_CHARGE_PUMP_EXCESS_VOLTAGE), min_charge_pump_excess_voltage = fxp_div(FXP_FROM_INT(FLASH_CONFIG_MIN_CHARGE_PUMP_EXCESS_VOLTAGE),
FXP_FROM_INT(1000)); FXP_FROM_INT(1000));
u_bat_load_on = fxp_div(FXP_FROM_INT(U_BAT_LOAD_ON), FXP_FROM_INT(1000)); u_bat_load_on = fxp_div(FXP_FROM_INT(FLASH_CONFIG_U_BAT_LOAD_ON), FXP_FROM_INT(1000));
u_bat_load_off = fxp_div(FXP_FROM_INT(U_BAT_LOAD_OFF), FXP_FROM_INT(1000)); u_bat_load_off = fxp_div(FXP_FROM_INT(FLASH_CONFIG_U_BAT_LOAD_OFF), FXP_FROM_INT(1000));
load_current_limit = fxp_div(FXP_FROM_INT(LOAD_CURRENT_LIMIT_MA), FXP_FROM_INT(1000)); load_current_limit = fxp_div(FXP_FROM_INT(FLASH_CONFIG_LOAD_CURRENT_LIMIT_MA), FXP_FROM_INT(1000));
internal_temperature_limit = fxp_div(FXP_FROM_INT(INTERNAL_TEMPERATURE_LIMIT), FXP_FROM_INT(10)); internal_temperature_limit = fxp_div(FXP_FROM_INT(FLASH_CONFIG_INTERNAL_TEMPERATURE_LIMIT), FXP_FROM_INT(10));
internal_temperature_recovery = fxp_div(FXP_FROM_INT(INTERNAL_TEMPERATURE_RECOVERY), FXP_FROM_INT(10)); internal_temperature_recovery = fxp_div(FXP_FROM_INT(FLASH_CONFIG_INTERNAL_TEMPERATURE_RECOVERY), FXP_FROM_INT(10));
sleep_solar_current = fxp_div(FXP_FROM_INT(SLEEP_SOLAR_CURRENT), FXP_FROM_INT(1000)); sleep_solar_current = fxp_div(FXP_FROM_INT(FLASH_CONFIG_SLEEP_SOLAR_CURRENT), FXP_FROM_INT(1000));
sleep_solar_excess_voltage = fxp_div(FXP_FROM_INT(SLEEP_SOLAR_EXCESS_VOLTAGE), FXP_FROM_INT(1000)); sleep_solar_excess_voltage = fxp_div(FXP_FROM_INT(FLASH_CONFIG_SLEEP_SOLAR_EXCESS_VOLTAGE), FXP_FROM_INT(1000));
} }

98
src/config.h
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@ -1,98 +0,0 @@
#ifndef CONFIG_H
#define CONFIG_H
/* Thresholds for charging control */
/* Battery regulation corridor width (in mV). */
#define U_BAT_REGULATION_CORRIDOR 100
/* Initial charge battery voltage threshold (in mV). */
#define U_BAT_INITIAL_FULL 28600 // stop charging if battery voltage reaches this threshold
/* Cancel initial charge voltage hold below this battery voltage (in mV). */
#define U_BAT_INITIAL_HOLD_CANCEL 27000
/* Transition to floating voltage levels after this time (in ms). */
#define INITIAL_CHARGE_HOLD_TIME 1800000
/* Duration of the transistion from initial charging to float (in ms). */
#define INITIAL_TO_FLOAT_TRANSITION_TIME 600000
/* Float charge battery voltage threshold (in mV). */
#define U_BAT_FLOAT_FULL 27600 // stop charging if battery voltage reaches this threshold
/* Minimum voltage difference to U_bat that the solar panels must produce
* before charging is resumed after it was switched off (in mV). */
#define SLEEP_SOLAR_EXCESS_VOLTAGE 1000
/* Minimum charge current required before charging is stopped to save power at
* the charge pump (in mA). */
#define SLEEP_SOLAR_CURRENT 1
/* Delay between state change and sleep state check (in ms). */
#define SLEEP_STATE_DELAY 100
/* Delay between charging switch state change and sleep state check(in ms). */
#define SLEEP_SWITCH_DELAY 1000
/* Maximum allowed microcontroller temperature (in units of 0.1 °C). If this
* temperature is exceeded, charging is stopped. The load is kept on. Do not
* set this too high as the heat has to propagate from the power MOSFETs. */
#define INTERNAL_TEMPERATURE_LIMIT 500
/* Resume operation below this temperature (in units of 0.1 °C). */
#define INTERNAL_TEMPERATURE_RECOVERY 450
/* Thresholds for load control */
/* Voltage above which the load is turned on (in mV). */
#define U_BAT_LOAD_ON 27000
/* Voltage below which the load is turned off (in mV). */
#define U_BAT_LOAD_OFF 24000
/* Current at which the overload protection triggers (in mA). */
#define LOAD_CURRENT_LIMIT_MA 10000
/* Inrush tolerance time (in ms). Overload protection is not enforced for this
* time after load power-on. */
#define LOAD_CURRENT_INRUSH_TIME 10
/* Minimum voltage that the charge pump must produce above U_bat before any
* power FET is switched on (in mV). */
#define MIN_CHARGE_PUMP_EXCESS_VOLTAGE 10000
/* The minimum time the load must be off before it can be switched on again (in ms). */
#define LOAD_ON_DELAY 10000
/* Measurement Averaging:
* Alpha is specified in units of 1/1000. 1000 means that only the latest
* value is relevant, 0 means that the measurement has no influence. The latter
* is useless.
*
* The formula to calculate the next averaged value avg from a measurement meas is:
* avg[k] = meas * (alpha/1000) + avg[k-1] * (1 - alpha/1000)
*
* For overload protection (battery voltage, load current), the latest values
* are always used.
* */
/* Averaging factor for load current. */
#define AVG_ALPHA_I_SOLAR 10
#define AVG_ALPHA_I_LOAD 10
#define AVG_ALPHA_U_BAT 100
#define AVG_ALPHA_U_SW 100
#define AVG_ALPHA_U_SOLAR 100
#define AVG_ALPHA_TEMP 10
/* Generic configuration */
/* Time (in ms) to stay active in idle state before entering deep sleep. */
#define DEEPSLEEP_DELAY 1000
/* Deep sleep duration (in seconds). */
#define DEEPSLEEP_DURATION 10
#endif // CONFIG_H

7
src/flash_config.c Normal file
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@ -0,0 +1,7 @@
#include "flash_config.h"
bool flash_config_is_present(void)
{
return (FLASH_CONFIG_CAL_FACTOR_U_BAT != 0xFFFF)
&& (FLASH_CONFIG_U_BAT_REGULATION_CORRIDOR != -1);
}

123
src/flash_config.h Normal file
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@ -0,0 +1,123 @@
#ifndef FLASH_CONFIG_H
#define FLASH_CONFIG_H
#include <stdint.h>
#include <stdbool.h>
extern uint8_t __conf_start;
#define FLASH_CONFIG_BASE_PTR ((uint8_t*)(&__conf_start))
/***** Calibration factors *****/
/* Calibration factor defined here are divided by 1000 to determine the actual
* scaling factor. Therefore, if the voltage determined by the firmware is 2%
* lower than the actual voltage, you have to scale by 1.02 and therefore
* specify 1020 in this list. */
#define FLASH_CONFIG_CAL_FACTOR_U_BAT (*(uint16_t*)(FLASH_CONFIG_BASE_PTR + 0x0000))
#define FLASH_CONFIG_CAL_FACTOR_U_SOLAR (*(uint16_t*)(FLASH_CONFIG_BASE_PTR + 0x0002))
#define FLASH_CONFIG_CAL_FACTOR_U_SW (*(uint16_t*)(FLASH_CONFIG_BASE_PTR + 0x0004))
#define FLASH_CONFIG_CAL_FACTOR_I_SOLAR (*(uint16_t*)(FLASH_CONFIG_BASE_PTR + 0x0006))
#define FLASH_CONFIG_CAL_FACTOR_I_LOAD (*(uint16_t*)(FLASH_CONFIG_BASE_PTR + 0x0008))
/***** General configuration *****/
/* Battery regulation corridor width (in mV). */
#define FLASH_CONFIG_U_BAT_REGULATION_CORRIDOR (*(int32_t*)(FLASH_CONFIG_BASE_PTR + 0x0100))
/* Initial charge battery voltage threshold (in mV). */
#define FLASH_CONFIG_U_BAT_INITIAL_FULL (*(int32_t*)(FLASH_CONFIG_BASE_PTR + 0x0104))
/* Cancel initial charge voltage hold below this battery voltage (in mV). */
#define FLASH_CONFIG_U_BAT_INITIAL_HOLD_CANCEL (*(int32_t*)(FLASH_CONFIG_BASE_PTR + 0x0108))
/* Transition to floating voltage levels after this time (in ms). */
#define FLASH_CONFIG_INITIAL_CHARGE_HOLD_TIME (*(uint32_t*)(FLASH_CONFIG_BASE_PTR + 0x010C))
/* Duration of the transistion from initial charging to float (in ms). */
#define FLASH_CONFIG_INITIAL_TO_FLOAT_TRANSITION_TIME (*(uint32_t*)(FLASH_CONFIG_BASE_PTR + 0x0110))
/* Float charge battery voltage threshold (in mV). */
#define FLASH_CONFIG_U_BAT_FLOAT_FULL (*(int32_t*)(FLASH_CONFIG_BASE_PTR + 0x0114))
/* Minimum voltage difference to U_bat that the solar panels must produce
* before charging is resumed after it was switched off (in mV). */
#define FLASH_CONFIG_SLEEP_SOLAR_EXCESS_VOLTAGE (*(int32_t*)(FLASH_CONFIG_BASE_PTR + 0x0118))
/* Minimum charge current required before charging is stopped to save power at
* the charge pump (in mA). */
#define FLASH_CONFIG_SLEEP_SOLAR_CURRENT (*(int32_t*)(FLASH_CONFIG_BASE_PTR + 0x011C))
/* Delay between state change and sleep state check (in ms). */
#define FLASH_CONFIG_SLEEP_STATE_DELAY (*(uint32_t*)(FLASH_CONFIG_BASE_PTR + 0x0120))
/* Delay between charging switch state change and sleep state check(in ms). */
#define FLASH_CONFIG_SLEEP_SWITCH_DELAY (*(uint32_t*)(FLASH_CONFIG_BASE_PTR + 0x0124))
/* Maximum allowed microcontroller temperature (in units of 0.1 °C). If this
* temperature is exceeded, charging is stopped. The load is kept on. Do not
* set this too high as the heat has to propagate from the power MOSFETs. */
#define FLASH_CONFIG_INTERNAL_TEMPERATURE_LIMIT (*(int32_t*)(FLASH_CONFIG_BASE_PTR + 0x0128))
/* Resume operation below this temperature (in units of 0.1 °C). */
#define FLASH_CONFIG_INTERNAL_TEMPERATURE_RECOVERY (*(int32_t*)(FLASH_CONFIG_BASE_PTR + 0x012C))
/* Thresholds for load control */
/* Voltage above which the load is turned on (in mV). */
#define FLASH_CONFIG_U_BAT_LOAD_ON (*(int32_t*)(FLASH_CONFIG_BASE_PTR + 0x0130))
/* Voltage below which the load is turned off (in mV). */
#define FLASH_CONFIG_U_BAT_LOAD_OFF (*(int32_t*)(FLASH_CONFIG_BASE_PTR + 0x0134))
/* Current at which the overload protection triggers (in mA). */
#define FLASH_CONFIG_LOAD_CURRENT_LIMIT_MA (*(int32_t*)(FLASH_CONFIG_BASE_PTR + 0x0138))
/* Inrush tolerance time (in ms). Overload protection is not enforced for this
* time after load power-on. */
#define FLASH_CONFIG_LOAD_CURRENT_INRUSH_TIME (*(uint32_t*)(FLASH_CONFIG_BASE_PTR + 0x013C))
/* Minimum voltage that the charge pump must produce above U_bat before any
* power FET is switched on (in mV). */
#define FLASH_CONFIG_MIN_CHARGE_PUMP_EXCESS_VOLTAGE (*(int32_t*)(FLASH_CONFIG_BASE_PTR + 0x0140))
/* The minimum time the load must be off before it can be switched on again (in ms). */
#define FLASH_CONFIG_LOAD_ON_DELAY (*(uint32_t*)(FLASH_CONFIG_BASE_PTR + 0x0144))
/* Measurement Averaging:
* Alpha is specified in units of 1/1000. 1000 means that only the latest
* value is relevant, 0 means that the measurement has no influence. The latter
* is useless.
*
* The formula to calculate the next averaged value avg from a measurement meas is:
* avg[k] = meas * (alpha/1000) + avg[k-1] * (1 - alpha/1000)
*
* For overload protection (battery voltage, load current), the latest values
* are always used.
* */
/* Averaging factor for load current. */
#define FLASH_CONFIG_AVG_ALPHA_I_SOLAR (*(int32_t*)(FLASH_CONFIG_BASE_PTR + 0x0148))
#define FLASH_CONFIG_AVG_ALPHA_I_LOAD (*(int32_t*)(FLASH_CONFIG_BASE_PTR + 0x014C))
#define FLASH_CONFIG_AVG_ALPHA_U_BAT (*(int32_t*)(FLASH_CONFIG_BASE_PTR + 0x0150))
#define FLASH_CONFIG_AVG_ALPHA_U_SW (*(int32_t*)(FLASH_CONFIG_BASE_PTR + 0x0154))
#define FLASH_CONFIG_AVG_ALPHA_U_SOLAR (*(int32_t*)(FLASH_CONFIG_BASE_PTR + 0x0158))
#define FLASH_CONFIG_AVG_ALPHA_TEMP (*(int32_t*)(FLASH_CONFIG_BASE_PTR + 0x015C))
/* Generic configuration */
/* Time (in ms) to stay active in idle state before entering deep sleep. */
#define FLASH_CONFIG_DEEPSLEEP_DELAY (*(uint32_t*)(FLASH_CONFIG_BASE_PTR + 0x0160))
/* Deep sleep duration (in seconds). */
#define FLASH_CONFIG_DEEPSLEEP_DURATION (*(uint32_t*)(FLASH_CONFIG_BASE_PTR + 0x0164))
/* Functions */
bool flash_config_is_present(void);
#endif // FLASH_CONFIG_H

25
src/main.c
View file

@ -19,7 +19,7 @@
#include "bmp280.h" #include "bmp280.h"
#include "pinout.h" #include "pinout.h"
#include "config.h" #include "flash_config.h"
volatile int wait_frame = 1; volatile int wait_frame = 1;
@ -43,6 +43,16 @@ static void init_systick(int freq)
} }
static void config_err_blink_code(uint64_t timebase_ms)
{
if(timebase_ms % 500 < 250) {
led_chplex_mask(0x3F); // all on
} else {
led_chplex_mask(0x00); // all off
}
}
static bool ledtest(uint64_t timebase_ms) static bool ledtest(uint64_t timebase_ms)
{ {
if(timebase_ms == 0) { if(timebase_ms == 0) {
@ -326,9 +336,14 @@ int main(void)
ledtest_done = ledtest(timebase_ms); ledtest_done = ledtest(timebase_ms);
led_chplex_periodic(); led_chplex_periodic();
} else if(!startup_done) { } else if(!startup_done) {
charge_pump_start(); if(flash_config_is_present()) {
charge_pump_start();
startup_done = true; startup_done = true;
} else {
config_err_blink_code(timebase_ms);
led_chplex_periodic();
}
} else { } else {
measurement_start(); measurement_start();
@ -366,8 +381,8 @@ int main(void)
charge_control_idle_since = timebase_ms; charge_control_idle_since = timebase_ms;
} else { } else {
// charge control already idle // charge control already idle
if((timebase_ms - charge_control_idle_since) > DEEPSLEEP_DELAY) { if((timebase_ms - charge_control_idle_since) > FLASH_CONFIG_DEEPSLEEP_DELAY) {
low_power_mode(DEEPSLEEP_DURATION); low_power_mode(FLASH_CONFIG_DEEPSLEEP_DURATION);
charge_control_was_idle = false; charge_control_was_idle = false;
} }
} }

16
src/measurement.c
View file

@ -8,7 +8,7 @@
#include "measurement.h" #include "measurement.h"
#include "calibration.h" #include "calibration.h"
#include "config.h" #include "flash_config.h"
#define ADC_NUM_CHANNELS 6 #define ADC_NUM_CHANNELS 6
static volatile int16_t adc_values[ADC_NUM_CHANNELS]; static volatile int16_t adc_values[ADC_NUM_CHANNELS];
@ -55,7 +55,7 @@ static fxp_t calc_temperature(uint16_t adc_val)
static fxp_t adc_val_to_pin_voltage(uint16_t adc_val) static fxp_t adc_val_to_pin_voltage(uint16_t adc_val)
{ {
return fxp_div( return fxp_div(
fxp_mult(FXP_FROM_INT(adc_val), fxp_div(FXP_FROM_INT(33), FXP_FROM_INT(10))), fxp_mult(FXP_FROM_INT((int32_t)adc_val), fxp_div(FXP_FROM_INT(33), FXP_FROM_INT(10))),
FXP_FROM_INT(4096)); FXP_FROM_INT(4096));
} }
@ -105,12 +105,12 @@ void measurement_init(void)
fxp_div(FXP_FROM_INT(CAL_FACTOR_I_LOAD), FXP_FROM_INT(1000)); fxp_div(FXP_FROM_INT(CAL_FACTOR_I_LOAD), FXP_FROM_INT(1000));
// Convert and precalculate coefficients for exponential averaging // Convert and precalculate coefficients for exponential averaging
avg_alpha_i_solar = fxp_div(FXP_FROM_INT(AVG_ALPHA_I_SOLAR), FXP_FROM_INT(1000)); avg_alpha_i_solar = fxp_div(FXP_FROM_INT(FLASH_CONFIG_AVG_ALPHA_I_SOLAR), FXP_FROM_INT(1000));
avg_alpha_i_load = fxp_div(FXP_FROM_INT(AVG_ALPHA_I_LOAD), FXP_FROM_INT(1000)); avg_alpha_i_load = fxp_div(FXP_FROM_INT(FLASH_CONFIG_AVG_ALPHA_I_LOAD), FXP_FROM_INT(1000));
avg_alpha_u_bat = fxp_div(FXP_FROM_INT(AVG_ALPHA_U_BAT), FXP_FROM_INT(1000)); avg_alpha_u_bat = fxp_div(FXP_FROM_INT(FLASH_CONFIG_AVG_ALPHA_U_BAT), FXP_FROM_INT(1000));
avg_alpha_u_sw = fxp_div(FXP_FROM_INT(AVG_ALPHA_U_SW), FXP_FROM_INT(1000)); avg_alpha_u_sw = fxp_div(FXP_FROM_INT(FLASH_CONFIG_AVG_ALPHA_U_SW), FXP_FROM_INT(1000));
avg_alpha_u_solar = fxp_div(FXP_FROM_INT(AVG_ALPHA_U_SOLAR), FXP_FROM_INT(1000)); avg_alpha_u_solar = fxp_div(FXP_FROM_INT(FLASH_CONFIG_AVG_ALPHA_U_SOLAR), FXP_FROM_INT(1000));
avg_alpha_temp = fxp_div(FXP_FROM_INT(AVG_ALPHA_TEMP), FXP_FROM_INT(1000)); avg_alpha_temp = fxp_div(FXP_FROM_INT(FLASH_CONFIG_AVG_ALPHA_TEMP), FXP_FROM_INT(1000));
// Inverse (1 - alpha) exponential averaging coefficients // Inverse (1 - alpha) exponential averaging coefficients
avg_alpha_i_solar_inv = fxp_sub(FXP_FROM_INT(1), avg_alpha_i_solar); avg_alpha_i_solar_inv = fxp_sub(FXP_FROM_INT(1), avg_alpha_i_solar);

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# Values for the device at the B26 tower
calibration:
# Calibration factor defined here are divided by 1000 to determine the actual
# scaling factor. Therefore, if the voltage determined by the firmware is 2%
# lower than the actual voltage, you have to scale by 1.02 and therefore
# specify 1020 in this list.
CAL_FACTOR_U_BAT: 994
CAL_FACTOR_U_SOLAR: 997
CAL_FACTOR_U_SW: 996
CAL_FACTOR_I_SOLAR: 1015
CAL_FACTOR_I_LOAD: 1000
config:
# Thresholds for charging control
# Battery regulation corridor width (in mV).
U_BAT_REGULATION_CORRIDOR: 100
# Initial charge battery voltage threshold (in mV).
# stop charging if battery voltage reaches this threshold
U_BAT_INITIAL_FULL: 28600
# Cancel initial charge voltage hold below this battery voltage (in mV).
U_BAT_INITIAL_HOLD_CANCEL: 27000
# Transition to floating voltage levels after this time (in ms).
INITIAL_CHARGE_HOLD_TIME: 1800000
# Duration of the transistion from initial charging to float (in ms).
INITIAL_TO_FLOAT_TRANSITION_TIME: 600000
# Float charge battery voltage threshold (in mV).
# stop charging if battery voltage reaches this threshold
U_BAT_FLOAT_FULL: 27600
# Minimum voltage difference to U_bat that the solar panels must produce
# before charging is resumed after it was switched off (in mV).
SLEEP_SOLAR_EXCESS_VOLTAGE: 1000
# Minimum charge current required before charging is stopped to save power at
# the charge pump (in mA).
SLEEP_SOLAR_CURRENT: 1
# Delay between state change and sleep state check (in ms).
SLEEP_STATE_DELAY: 60000
# Delay between charging switch state change and sleep state check(in ms).
SLEEP_SWITCH_DELAY: 1000
# Maximum allowed microcontroller temperature (in units of 0.1 °C). If this
# temperature is exceeded, charging is stopped. The load is kept on. Do not
# set this too high as the heat has to propagate from the power MOSFETs.
INTERNAL_TEMPERATURE_LIMIT: 500
# Resume operation below this temperature (in units of 0.1 °C).
INTERNAL_TEMPERATURE_RECOVERY: 450
# Thresholds for load control
# Voltage above which the load is turned on (in mV).
U_BAT_LOAD_ON: 27000
# Voltage below which the load is turned off (in mV).
U_BAT_LOAD_OFF: 24000
# Current at which the overload protection triggers (in mA).
LOAD_CURRENT_LIMIT_MA: 10000
# Inrush tolerance time (in ms). Overload protection is not enforced for this
# time after load power-on.
LOAD_CURRENT_INRUSH_TIME: 10
# Minimum voltage that the charge pump must produce above U_bat before any
# power FET is switched on (in mV).
MIN_CHARGE_PUMP_EXCESS_VOLTAGE: 10000
# The minimum time the load must be off before it can be switched on again (in ms).
LOAD_ON_DELAY: 10000
# Measurement Averaging:
# Alpha is specified in units of 1/1000. 1000 means that only the latest
# value is relevant, 0 means that the measurement has no influence. The latter
# is useless.
#
# The formula to calculate the next averaged value avg from a measurement meas is:
# avg[k] = meas * (alpha/1000) + avg[k-1] * (1 alpha/1000)
#
# For overload protection (battery voltage, load current), the latest values
# are always used.
# Averaging factor for load current.
AVG_ALPHA_I_SOLAR: 10
AVG_ALPHA_I_LOAD: 10
AVG_ALPHA_U_BAT: 100
AVG_ALPHA_U_SW: 100
AVG_ALPHA_U_SOLAR: 100
AVG_ALPHA_TEMP: 10
# Generic configuration
# Time (in ms) to stay active in idle state before entering deep sleep.
DEEPSLEEP_DELAY: 1000
# Deep sleep duration (in seconds).
DEEPSLEEP_DURATION: 10

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# Values for the development device
calibration:
# Calibration factor defined here are divided by 1000 to determine the actual
# scaling factor. Therefore, if the voltage determined by the firmware is 2%
# lower than the actual voltage, you have to scale by 1.02 and therefore
# specify 1020 in this list.
CAL_FACTOR_U_BAT: 1012
CAL_FACTOR_U_SOLAR: 1015
CAL_FACTOR_U_SW: 1006
CAL_FACTOR_I_SOLAR: 3980
CAL_FACTOR_I_LOAD: 1000
config:
# Thresholds for charging control
# Battery regulation corridor width (in mV).
U_BAT_REGULATION_CORRIDOR: 100
# Initial charge battery voltage threshold (in mV).
# stop charging if battery voltage reaches this threshold
U_BAT_INITIAL_FULL: 28600
# Cancel initial charge voltage hold below this battery voltage (in mV).
U_BAT_INITIAL_HOLD_CANCEL: 27000
# Transition to floating voltage levels after this time (in ms).
INITIAL_CHARGE_HOLD_TIME: 1800000
# Duration of the transistion from initial charging to float (in ms).
INITIAL_TO_FLOAT_TRANSITION_TIME: 600000
# Float charge battery voltage threshold (in mV).
# stop charging if battery voltage reaches this threshold
U_BAT_FLOAT_FULL: 27600
# Minimum voltage difference to U_bat that the solar panels must produce
# before charging is resumed after it was switched off (in mV).
SLEEP_SOLAR_EXCESS_VOLTAGE: 1000
# Minimum charge current required before charging is stopped to save power at
# the charge pump (in mA).
SLEEP_SOLAR_CURRENT: 1
# Delay between state change and sleep state check (in ms).
SLEEP_STATE_DELAY: 60000
# Delay between charging switch state change and sleep state check(in ms).
SLEEP_SWITCH_DELAY: 1000
# Maximum allowed microcontroller temperature (in units of 0.1 °C). If this
# temperature is exceeded, charging is stopped. The load is kept on. Do not
# set this too high as the heat has to propagate from the power MOSFETs.
INTERNAL_TEMPERATURE_LIMIT: 500
# Resume operation below this temperature (in units of 0.1 °C).
INTERNAL_TEMPERATURE_RECOVERY: 450
# Thresholds for load control
# Voltage above which the load is turned on (in mV).
U_BAT_LOAD_ON: 27000
# Voltage below which the load is turned off (in mV).
U_BAT_LOAD_OFF: 24000
# Current at which the overload protection triggers (in mA).
LOAD_CURRENT_LIMIT_MA: 10000
# Inrush tolerance time (in ms). Overload protection is not enforced for this
# time after load power-on.
LOAD_CURRENT_INRUSH_TIME: 10
# Minimum voltage that the charge pump must produce above U_bat before any
# power FET is switched on (in mV).
MIN_CHARGE_PUMP_EXCESS_VOLTAGE: 10000
# The minimum time the load must be off before it can be switched on again (in ms).
LOAD_ON_DELAY: 10000
# Measurement Averaging:
# Alpha is specified in units of 1/1000. 1000 means that only the latest
# value is relevant, 0 means that the measurement has no influence. The latter
# is useless.
#
# The formula to calculate the next averaged value avg from a measurement meas is:
# avg[k] = meas * (alpha/1000) + avg[k-1] * (1 alpha/1000)
#
# For overload protection (battery voltage, load current), the latest values
# are always used.
# Averaging factor for load current.
AVG_ALPHA_I_SOLAR: 10
AVG_ALPHA_I_LOAD: 10
AVG_ALPHA_U_BAT: 100
AVG_ALPHA_U_SW: 100
AVG_ALPHA_U_SOLAR: 100
AVG_ALPHA_TEMP: 10
# Generic configuration
# Time (in ms) to stay active in idle state before entering deep sleep.
DEEPSLEEP_DELAY: 1000
# Deep sleep duration (in seconds).
DEEPSLEEP_DURATION: 10

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utils/config_to_hex.py Executable file
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#!/usr/bin/env python3
import sys
import struct
import yaml
from intelhex import IntelHex
BASE_ADDR = 0x08007C00
CALIBRATION_KEY_TO_OFFSET = {
"CAL_FACTOR_U_BAT": 0x0000,
"CAL_FACTOR_U_SOLAR": 0x0002,
"CAL_FACTOR_U_SW": 0x0004,
"CAL_FACTOR_I_SOLAR": 0x0006,
"CAL_FACTOR_I_LOAD": 0x0008,
}
CONFIG_KEY_TO_OFFSET = {
"U_BAT_REGULATION_CORRIDOR": 0x0100,
"U_BAT_INITIAL_FULL": 0x0104,
"U_BAT_INITIAL_HOLD_CANCEL": 0x0108,
"INITIAL_CHARGE_HOLD_TIME": 0x010C,
"INITIAL_TO_FLOAT_TRANSITION_TIME": 0x0110,
"U_BAT_FLOAT_FULL": 0x0114,
"SLEEP_SOLAR_EXCESS_VOLTAGE": 0x0118,
"SLEEP_SOLAR_CURRENT": 0x011C,
"SLEEP_STATE_DELAY": 0x0120,
"SLEEP_SWITCH_DELAY": 0x0124,
"INTERNAL_TEMPERATURE_LIMIT": 0x0128,
"INTERNAL_TEMPERATURE_RECOVERY": 0x012C,
"U_BAT_LOAD_ON": 0x0130,
"U_BAT_LOAD_OFF": 0x0134,
"LOAD_CURRENT_LIMIT_MA": 0x0138,
"LOAD_CURRENT_INRUSH_TIME": 0x013C,
"MIN_CHARGE_PUMP_EXCESS_VOLTAGE": 0x0140,
"LOAD_ON_DELAY": 0x0144,
"AVG_ALPHA_I_SOLAR": 0x0148,
"AVG_ALPHA_I_LOAD": 0x014C,
"AVG_ALPHA_U_BAT": 0x0150,
"AVG_ALPHA_U_SW": 0x0154,
"AVG_ALPHA_U_SOLAR": 0x0158,
"AVG_ALPHA_TEMP": 0x015C,
"DEEPSLEEP_DELAY": 0x0160,
"DEEPSLEEP_DURATION": 0x0164,
}
if __name__ == "__main__":
output = IntelHex()
if len(sys.argv) < 3:
print(f"usage: {sys.argv[0]} <yaml-config> <output-hex>")
sys.exit(1)
with open(sys.argv[1], 'r') as configfile:
config = yaml.safe_load(configfile)
for key, offset in CALIBRATION_KEY_TO_OFFSET.items():
value = config['calibration'][key]
enc_bytes = struct.pack('<H', value)
output.puts(BASE_ADDR + offset, enc_bytes)
for key, offset in CONFIG_KEY_TO_OFFSET.items():
value = config['config'][key]
enc_bytes = struct.pack('<I', value)
output.puts(BASE_ADDR + offset, enc_bytes)
output.write_hex_file(sys.argv[2])

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utils/upload_config_hex.sh Executable file
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#!/bin/sh
set -euo pipefail
HEXFILE="$1"
if [ ! -f "$HEXFILE" ]; then
echo "$HEXFILE cannot be accessed."
exit 1
fi
JLinkExe -device STM32F030C8 -speed 1000 -if SWD <<EOF
connect
loadfile $HEXFILE
r
g
exit
EOF