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Merge pull request #2447 from leptun/MK3_BED_LEVELING_PWM

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Turn off bed while probing during MBL
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DRracer 2020-01-30 11:18:34 +01:00 committed by GitHub
commit 48a0532e37
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 17 additions and 0 deletions
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10
Firmware/heatbed_pwm.cpp
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@ -45,6 +45,12 @@
// If there are any change requirements in the future, the signal must be checked with an osciloscope again,
// ad-hoc changes may completely screw things up!
// 2020-01-29 update: we are introducing a new option to the automaton that will allow us to force the output state
// to either full ON or OFF. This is so that interference during the MBL probing is minimal.
// To accomplish this goal we use bedPWMDisabled. It is only supposed to be used for brief periods of time as to
// not make the bed temperature too unstable. Also, careful consideration should be used when using this
// option as leaving this enabled will also keep the bed output in the state it stopped in.
///! Definition off finite automaton states
enum class States : uint8_t {
ZERO_START = 0,///< entry point of the automaton - reads the soft_pwm_bed value for the next whole PWM cycle
@ -61,6 +67,8 @@ enum class States : uint8_t {
///! Inner states of the finite automaton
static States state = States::ZERO_START;
bool bedPWMDisabled = 0;
///! Fast PWM counter is used in the RISE and FALL states (62.5kHz)
static uint8_t slowCounter = 0;
///! Slow PWM counter is used in the ZERO and ONE states (62.5kHz/8 or 64)
@ -93,6 +101,7 @@ ISR(TIMER0_OVF_vect) // timer compare interrupt service routine
{
switch(state){
case States::ZERO_START:
if (bedPWMDisabled) return; // stay in the OFF state and do not change the output pin
pwm = soft_pwm_bed << 1;// expecting soft_pwm_bed to be 7bit!
if( pwm != 0 ){
state = States::ZERO; // do nothing, let it tick once again after the 30Hz period
@ -136,6 +145,7 @@ ISR(TIMER0_OVF_vect) // timer compare interrupt service routine
break;
case States::ONE: // state ONE - we'll either stay in ONE or change to FALL
OCR0B = 255;
if (bedPWMDisabled) return; // stay in the ON state and do not change the output pin
slowCounter += slowInc; // this does software timer_clk/256 or less
if( slowCounter < pwm ){
return;

4
Firmware/mesh_bed_calibration.cpp
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@ -6,6 +6,7 @@
#include "mesh_bed_leveling.h"
#include "stepper.h"
#include "ultralcd.h"
#include "temperature.h"
#ifdef TMC2130
#include "tmc2130.h"
@ -946,6 +947,7 @@ inline bool find_bed_induction_sensor_point_z(float minimum_z, uint8_t n_iter, i
)
{
bool high_deviation_occured = false;
bedPWMDisabled = 1;
#ifdef TMC2130
FORCE_HIGH_POWER_START;
#endif
@ -1044,6 +1046,7 @@ inline bool find_bed_induction_sensor_point_z(float minimum_z, uint8_t n_iter, i
#ifdef TMC2130
FORCE_HIGH_POWER_END;
#endif
bedPWMDisabled = 0;
return true;
error:
@ -1053,6 +1056,7 @@ error:
#ifdef TMC2130
FORCE_HIGH_POWER_END;
#endif
bedPWMDisabled = 0;
return false;
}

1
Firmware/temperature.cpp
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@ -1403,6 +1403,7 @@ void disable_heater()
target_temperature_bed=0;
soft_pwm_bed=0;
timer02_set_pwm0(soft_pwm_bed << 1);
bedPWMDisabled = 0;
#if defined(HEATER_BED_PIN) && HEATER_BED_PIN > -1
//WRITE(HEATER_BED_PIN,LOW);
#endif

2
Firmware/temperature.h
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@ -84,6 +84,8 @@ extern int current_voltage_raw_IR;
extern unsigned char soft_pwm_bed;
#endif
extern bool bedPWMDisabled;
#ifdef PIDTEMP
extern int pid_cycle, pid_number_of_cycles;
extern float Kc,_Kp,_Ki,_Kd;