51 lines
1.0 KiB
C
51 lines
1.0 KiB
C
#ifndef _TEMP_H
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#define _TEMP_H
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#include <stdint.h>
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// extruder heater PID factors
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// google "PID without a PHD" if you don't understand this PID stuff
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extern int32_t p_factor;
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extern int32_t i_factor;
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extern int32_t d_factor;
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#define PID_SCALE 1024L
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#define I_LIMIT 4000
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typedef union {
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struct {
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uint8_t high;
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uint8_t low;
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} buf;
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struct {
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uint16_t dummy :1;
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uint16_t reading :12;
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uint16_t tc_open :1;
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uint16_t device_id :1;
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uint16_t tristate :1;
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} interpret;
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} max6675_data_format;
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// read temperature from sensor
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uint16_t temp_read(void);
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// set target temperature
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void temp_set(uint16_t t);
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// return last read temperature
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uint16_t temp_get(void);
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// return target temperature
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uint16_t temp_get_target(void);
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// true if last read temp is close to target temp, false otherwise
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uint8_t temp_achieved(void);
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// send current temperature to host
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void temp_print(void);
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// periodically read temperature and update heater with PID
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void temp_tick(void);
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#endif /* _TIMER_H */
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