117 lines
3.9 KiB
C++
117 lines
3.9 KiB
C++
// model-based temperature safety checker declarations
|
|
#ifndef TEMP_MGR_INTV
|
|
#error "this file is not a public interface, it should be used *only* within temperature.cpp!"
|
|
#endif
|
|
|
|
#include "planner.h"
|
|
|
|
constexpr uint8_t TEMP_MODEL_CAL_S = 60; // Maximum recording lenght during calibration (s)
|
|
constexpr uint8_t TEMP_MODEL_CAL_R_STEP = 4; // Fan interpolation steps during calibration
|
|
constexpr float TEMP_MODEL_fS = 0.065; // simulation filter (1st-order IIR factor)
|
|
constexpr float TEMP_MODEL_fE = 0.05; // error filter (1st-order IIR factor)
|
|
|
|
// transport delay buffer size (samples)
|
|
constexpr uint8_t TEMP_MODEL_LAG_SIZE = (TEMP_MODEL_LAG / TEMP_MGR_INTV + 0.5);
|
|
|
|
// resistance values for all fan levels
|
|
constexpr uint8_t TEMP_MODEL_R_SIZE = (1 << FAN_SOFT_PWM_BITS);
|
|
|
|
namespace temp_model {
|
|
|
|
struct model_data
|
|
{
|
|
// temporary buffers
|
|
float dT_lag_buf[TEMP_MODEL_LAG_SIZE]; // transport delay buffer
|
|
uint8_t dT_lag_idx = 0; // transport delay buffer index
|
|
float dT_err_prev = 0; // previous temperature delta error
|
|
float T_prev = 0; // last temperature extruder
|
|
|
|
// configurable parameters
|
|
float P; // heater power (W)
|
|
float C; // heatblock capacitance (J/K)
|
|
float R[TEMP_MODEL_R_SIZE]; // heatblock resistance for all fan levels (K/W)
|
|
float Ta_corr; // ambient temperature correction (K)
|
|
|
|
// thresholds
|
|
float warn; // warning threshold (K/s)
|
|
float err; // error threshold (K/s)
|
|
|
|
// status flags
|
|
union
|
|
{
|
|
bool flags;
|
|
struct
|
|
{
|
|
bool uninitialized: 1; // model is not initialized
|
|
bool error: 1; // error threshold set
|
|
bool warning: 1; // warning threshold set
|
|
} flag_bits;
|
|
};
|
|
|
|
// pre-computed values (initialized via reset)
|
|
float C_i; // heatblock capacitance (precomputed dT/C)
|
|
float warn_s; // warning threshold (per sample)
|
|
float err_s; // error threshold (per sample)
|
|
|
|
// simulation functions
|
|
void reset(uint8_t heater_pwm, uint8_t fan_pwm, float heater_temp, float ambient_temp);
|
|
void step(uint8_t heater_pwm, uint8_t fan_pwm, float heater_temp, float ambient_temp);
|
|
};
|
|
|
|
static bool enabled; // model check enabled
|
|
static bool valid = false; // model is valid
|
|
static bool warn_beep = true; // beep on warning threshold
|
|
static model_data data; // default heater data
|
|
|
|
static bool calibrated(); // return calibration/model validity status
|
|
static void check(); // check and trigger errors or warnings based on current state
|
|
|
|
// warning state (updated from from isr context)
|
|
volatile static struct
|
|
{
|
|
float dT_err; // temperature delta error (per sample)
|
|
bool warning: 1; // warning condition
|
|
bool assert: 1; // warning is still asserted
|
|
} warning_state;
|
|
|
|
static void handle_warning(); // handle warnings from user context
|
|
|
|
#ifdef TEMP_MODEL_DEBUG
|
|
static struct
|
|
{
|
|
volatile struct
|
|
{
|
|
uint32_t stamp;
|
|
int8_t delta_ms;
|
|
uint8_t counter;
|
|
uint8_t cur_pwm;
|
|
float cur_temp;
|
|
float cur_amb;
|
|
} entry;
|
|
|
|
uint8_t serial;
|
|
bool enabled;
|
|
} log_buf;
|
|
|
|
static void log_usr(); // user log handler
|
|
static void log_isr(); // isr log handler
|
|
#endif
|
|
|
|
} // namespace temp_model
|
|
|
|
namespace temp_model_cal {
|
|
|
|
// recording scratch buffer
|
|
struct rec_entry
|
|
{
|
|
float temp; // heater temperature
|
|
uint8_t pwm; // heater PWM
|
|
};
|
|
|
|
constexpr uint16_t REC_BUFFER_SIZE = TEMP_MODEL_CAL_S / TEMP_MGR_INTV;
|
|
static rec_entry* const rec_buffer = (rec_entry*)block_buffer; // oh-hey, free memory!
|
|
static_assert(sizeof(rec_entry[REC_BUFFER_SIZE]) <= sizeof(block_buffer),
|
|
"recording length too long to fit within available buffer");
|
|
|
|
} // namespace temp_model_cal
|