Disable debug output, Remove impl. without timer

disable debug task
remove software implementation of stepper control

components/DendoStepper/DendoStepper.cpp

@@ -55,9 +55,6 @@ void DendoStepper::init(uint8_t stepP, uint8_t dirP, uint8_t enP, timer_group_t
 
 void DendoStepper::init()
 {
-    ESP_LOGW("DendoStepper", "semaphore init");
-    semaphore_isrVariables = xSemaphoreCreateBinary();
-    xSemaphoreGive(semaphore_isrVariables);
     uint64_t mask = (1ULL << conf.stepPin) | (1ULL << conf.dirPin) | (1ULL << conf.enPin); // put output gpio pins in bitmask
     gpio_config_t gpio_conf = {
         // config gpios
@@ -117,36 +114,25 @@ timer_avail:
     ESP_ERROR_CHECK(timer_isr_callback_add(conf.timer_group, conf.timer_idx, xISRwrap, this, 0)); // add callback fn to run when alarm is triggrd
 }
 
-
 esp_err_t DendoStepper::runPos(int32_t relative)
 {
-    //TODO only enable when actually moving
-    if (ctrl.status == DISABLED) // if motor is disabled, enable it
-        enableMotor();
-
-    setDir(relative < 0); // set CCW if <0, else set CW
-
     if (!relative) // why would u call it with 0 wtf
         return ESP_ERR_NOT_SUPPORTED;
-
+    if (ctrl.status > IDLE)
-    if (ctrl.status > IDLE) { //currently moving
+    { // we are running, we need to adjust steps accordingly, for now just stop the movement
-        //ctrl.status = ctrl.status==COAST ? COAST : ACC; //stay at coast otherwise switch to ACC
+        STEP_LOGW("DendoStepper", "Finising previous move, this command will be ignored");
-        ctrl.stepsRemaining = ctrl.stepsToGo - ctrl.stepCnt; 
+        return ESP_ERR_NOT_SUPPORTED;
-        calc(abs(relative) + ctrl.stepsRemaining); //calculate new velolcity profile for new+remaining steps
-        ESP_LOGW("DendoStepper", "EXTEND running movement (stepsRemaining: %d + stepsNew: %d  - current state: %d)", ctrl.stepsRemaining, abs(relative), (int)ctrl.status);
-        ESP_ERROR_CHECK(timer_set_alarm_value(conf.timer_group, conf.timer_idx, ctrl.stepInterval)); // set HW timer alarm to stepinterval
     }
 
-    else { //current state is IDLE
+    if (ctrl.status == DISABLED) // if motor is disabled, enable it
-           //ctrl.statusPrev = ctrl.status; //update previous status
+        enableMotor();
-        calc(abs(relative));                                                                         // calculate velocity profile
+    ctrl.status = ACC;
-        ctrl.status = ACC;
+    setDir(relative < 0); // set CCW if <0, else set CW
-        ESP_ERROR_CHECK(timer_set_alarm_value(conf.timer_group, conf.timer_idx, ctrl.stepInterval)); // set HW timer alarm to stepinterval
+    currentPos += relative;
-        ESP_ERROR_CHECK(timer_start(conf.timer_group, conf.timer_idx));                              // start the timer
+    calc(abs(relative));                                                                         // calculate velocity profile
-    }
+    ESP_ERROR_CHECK(timer_set_alarm_value(conf.timer_group, conf.timer_idx, ctrl.stepInterval)); // set HW timer alarm to stepinterval
+    ESP_ERROR_CHECK(timer_start(conf.timer_group, conf.timer_idx));                              // start the timer
 
-    //printf("runpos end -- steps: %d, status: %d, olddir: %d, newdir: %d\n", relative, ctrl.status, ctrl.dir, newDir);
-    currentPos += relative; //(target position / not actual)
     return ESP_OK;
 }
 
@@ -159,31 +145,26 @@ esp_err_t DendoStepper::runPosMm(int32_t relative)
     return runPos(relative * ctrl.stepsPerMm);
 }
 
-//customized: if already running and direction is the same immediately pass to runPos
 esp_err_t DendoStepper::runAbs(uint32_t position)
 {
-    //exit if nothing to do
+    if (getState() > IDLE) // we are already moving, so stop it
-    if (position == currentPos) return 0; //already at position
+        stop();
+    while (getState() > IDLE)
+    {
+        // waiting for idle, watchdog should take care of inf loop if it occurs
+        vTaskDelay(1);
+    } // shouldnt take long tho
+
+    if (position == currentPos) // we cant go anywhere
+        return 0;
 
-    //calculate steps necessary
     int32_t relativeSteps = 0;
     relativeSteps = (int32_t)position - currentPos;
 
-    //wait if direction needs to change
-    if (getState() > IDLE){//already moving
-        bool newDir = (relativeSteps < 0); // CCW if <0, else set CW
-        if (ctrl.dir != newDir){ //direction differs 
-            STEP_LOGE("DendoStepper", "DIRECTION HOT-CHANGE NOT SUPPORTED - Waiting for move to finish...");
-            while (getState() > IDLE) vTaskDelay(5); //wait for move to finish
-        }
-    }
-
-    //call runPos with new target position
     ESP_LOGI("DendoStepper", "Cur: %llu move %d", currentPos, relativeSteps);
     return runPos(relativeSteps); // run to new position
 }
 
-
 esp_err_t DendoStepper::runAbsMm(uint32_t position)
 {
     if (ctrl.stepsPerMm == 0)
@@ -214,37 +195,6 @@ void DendoStepper::setSpeedMm(uint32_t speed, uint16_t accT, uint16_t decT)
     STEP_LOGI("DendoStepper", "Speed set: v=%d mm/s t+=%d s t-=%d s", speed, accT, decT);
 }
 
-//CUSTOM - change speed while running 
-//FIXME: this approach does not work, since calc function would have to be run after change, this will mess up target steps...
-//void DendoStepper::changeSpeed(uint32_t speed)
-//{
-//    //TODO reduce duplicate code (e.g. call setSpeed function)
-//    //change speed
-//    ctrl.speed = speed;
-//    //change status to ACC/DEC
-//    STEP_LOGI("DendoStepper", "Speed changed: from v=%.2f rad/s to v=%.2f rad/s", ctrl.speed, speed);
-//    if (speed > ctrl.speed) ctrl.status = ACC;
-//    if (speed < ctrl.speed) ctrl.status = DEC;
-//}
-//
-//void DendoStepper::changeSpeedMm(uint32_t speed)
-//{
-//    //TODO reduce duplicate code (e.g. call setSpeedMm function)
-//    if (ctrl.stepsPerMm == 0)
-//    {
-//        STEP_LOGE("DendoStepper", "Steps per millimeter not set, cannot set the speed!");
-//    }
-//    //calc new speed
-//    float speedNew = speed * ctrl.stepsPerMm;
-//    //change status to ACC/DEC
-//    if (speedNew > ctl.speed) ctrl.status = ACC;
-//    if (speedNew < ctl.speed) ctrl.status = DEC;
-//    //update speed, log output
-//    ctrl.speed = speedNew;
-//    STEP_LOGI("DendoStepper", "Speed changed: from v=%.2f rad/s to v=%.2f rad/s", ctrl.speed, speedNew);
-//}
-
-
 void DendoStepper::setStepsPerMm(uint16_t steps)
 {
     ctrl.stepsPerMm = steps;
@@ -311,7 +261,6 @@ void DendoStepper::stop()
     }
     ctrl.runInfinite = false;
     timer_pause(conf.timer_group, conf.timer_idx); // stop the timer
-    //ctrl.statusPrev = ctrl.status; //update previous status
     ctrl.status = IDLE;
     ctrl.stepCnt = 0;
     gpio_set_level((gpio_num_t)conf.stepPin, 0);
@@ -338,23 +287,10 @@ bool DendoStepper::xISR()
 
     ctrl.stepCnt++;
 
-    ////CUSTOM: track actual precice current position
-    //if (ctrl.dir) {
-    //    ctrl.posActual ++;
-    //} else {
-    //    ctrl.posActual --;
-    //}
-    
-    //CUSTOM: track remaining steps for eventually resuming
-    //xSemaphoreTake(semaphore_isrVariables, portMAX_DELAY);
-    //ctrl.stepsRemaining = ctrl.stepCnt - ctrl.stepCnt; 
-    //xSemaphoreGive(semaphore_isrVariables);
-
     // we are done
     if (ctrl.stepsToGo == ctrl.stepCnt && !ctrl.runInfinite)
     {
         timer_pause(conf.timer_group, conf.timer_idx); // stop the timer
-        //ctrl.statusPrev = ctrl.status; //update previous status
         ctrl.status = IDLE;
         ctrl.stepCnt = 0;
         return 0;
@@ -363,19 +299,16 @@ bool DendoStepper::xISR()
     if (ctrl.stepCnt > 0 && ctrl.stepCnt < ctrl.accEnd)
     { // we are accelerating
         ctrl.currentSpeed += ctrl.accInc;
-        //ctrl.statusPrev = ctrl.status; //update previous status
         ctrl.status = ACC; // we are accelerating, note that*/
     }
     else if (ctrl.stepCnt > ctrl.coastEnd && !ctrl.runInfinite)
     { // we must be deccelerating then
         ctrl.currentSpeed -= ctrl.decInc;
-        //ctrl.statusPrev = ctrl.status; //update previous status
         ctrl.status = DEC; // we are deccelerating
     }
     else
     {
         ctrl.currentSpeed = ctrl.targetSpeed;
-        //ctrl.statusPrev = ctrl.status; //update previous status
         ctrl.status = COAST; // we are coasting
     }
 
@@ -388,33 +321,17 @@ bool DendoStepper::xISR()
 
 void DendoStepper::calc(uint32_t targetSteps)
 {
-	//only set initial speed if IDLE
-	if(ctrl.status == 1){
-		ctrl.currentSpeed = 0;
-		ESP_LOGD("DendoStepper", "calc-start: reset speed to 0 (start from idle) %lf\n", ctrl.currentSpeed);
-	}
-	else{
-		ESP_LOGD("DendoStepper", "calc start: NOT resetting speed (extend from ACC/DEC/COAST): %lf\n", ctrl.currentSpeed);
-	}
-    //CUSTOM reset counter if already moving
-    ctrl.stepCnt = 0; //FIXME bugs when set 0 while ISR reads/runs? mutex
 
-    //steps from ctrl.speed -> 0:
+    ctrl.accSteps = 0.5 * ctrl.acc * (ctrl.speed / ctrl.acc) * (ctrl.speed / ctrl.acc);
+
     ctrl.decSteps = 0.5 * ctrl.dec * (ctrl.speed / ctrl.dec) * (ctrl.speed / ctrl.dec);
-	ESP_LOGD("DendoStepper", "decSteps: %d  currspeed: %lf,  ctrlSpeed: %lf\n", ctrl.decSteps, ctrl.currentSpeed,  ctrl.speed);
-    //steps from 0 -> ctrl.speed:
-    //ctrl.accSteps = 0.5 * ctrl.acc * (ctrl.speed / ctrl.acc) * (ctrl.speed / ctrl.acc);
-    //steps from ctrl.currentSpeed -> ctrl.speed:
-    ctrl.accSteps = 0.5 * ctrl.acc * (ctrl.speed / ctrl.acc) * (ctrl.speed / ctrl.acc)  * (ctrl.speed - ctrl.currentSpeed) / ctrl.speed;
-	ESP_LOGD("DendoStepper", "accSteps: %d  currspeed: %lf,  ctrlSpeed: %lf\n", ctrl.accSteps, ctrl.currentSpeed,  ctrl.speed);
 
     if (targetSteps < (ctrl.decSteps + ctrl.accSteps))
     {
         ESP_LOGI("Dendostepper", "Computing new speed");
 
         ctrl.speed = sqrt(2 * targetSteps * ((ctrl.dec * ctrl.acc) / (ctrl.dec + ctrl.acc)));
-        //ctrl.accSteps = 0.5 * ctrl.acc * (ctrl.speed / ctrl.acc) * (ctrl.speed / ctrl.acc);
+        ctrl.accSteps = 0.5 * ctrl.acc * (ctrl.speed / ctrl.acc) * (ctrl.speed / ctrl.acc);
-        ctrl.accSteps = 0.5 * ctrl.acc * (ctrl.speed / ctrl.acc) * (ctrl.speed / ctrl.acc)  * (ctrl.speed - ctrl.currentSpeed) / ctrl.speed;
         ctrl.decSteps = 0.5 * ctrl.dec * (ctrl.speed / ctrl.dec) * (ctrl.speed / ctrl.dec);
     }
 
@@ -422,27 +339,13 @@ void DendoStepper::calc(uint32_t targetSteps)
     ctrl.coastEnd = targetSteps - ctrl.decSteps;
     ctrl.targetSpeed = ctrl.speed;
 
-    ctrl.accInc = (ctrl.targetSpeed - ctrl.currentSpeed) / (double)ctrl.accSteps;
+    ctrl.accInc = ctrl.targetSpeed / (double)ctrl.accSteps;
     ctrl.decInc = ctrl.targetSpeed / (double)ctrl.decSteps;
 
-	//only set initial speed if IDLE
+    ctrl.currentSpeed = ctrl.accInc;
-	if(ctrl.status == 1){
-		ctrl.currentSpeed = ctrl.accInc;
-		ESP_LOGD("DendoStepper", "`reset curr speeed to accinc: %lf\n", ctrl.currentSpeed);
-		ESP_LOGD("DendoStepper", "status=%d setting speed to initial value: %lf\n",ctrl.status, ctrl.currentSpeed);
-	}
-	else{
-		ESP_LOGD("DendoStepper", "status=%d NOT resetting speed to initial value %lf\n",ctrl.status, ctrl.currentSpeed);
-	}
 
     ctrl.stepInterval = TIMER_F / ctrl.currentSpeed;
     ctrl.stepsToGo = targetSteps;
 
-	//debug log output
+    STEP_LOGI("calc", "acc end:%u coastend:%u stepstogo:%u speed:%f acc:%f int: %u", ctrl.accEnd, ctrl.coastEnd, ctrl.stepsToGo, ctrl.speed, ctrl.acc, ctrl.stepInterval);
-	ESP_LOGD("DendoStepper", "accSteps: %d,  accInc: %lf, decSteps: %d, decInc: %lf", 
-			ctrl.accSteps, ctrl.accInc, ctrl.decSteps, ctrl.decInc);
-    ESP_LOGD("DendoStepper", "speedNow=%.1f, speedTarget=%.1f, accEnd=%d, coastEnd=%d,  accSteps=%d, accInc=%.3f\n",
-            ctrl.currentSpeed, ctrl.targetSpeed, ctrl.accEnd, ctrl.coastEnd, ctrl.accSteps, ctrl.accInc);
-    ESP_LOGD("DendoStepper", "acc end:%u coastend:%u stepstogo:%u speed:%f acc:%f int: %u",
-			ctrl.accEnd, ctrl.coastEnd, ctrl.stepsToGo, ctrl.speed, ctrl.acc, ctrl.stepInterval);
 }

components/DendoStepper/include/DendoStepper.h

@@ -29,7 +29,6 @@
 #include "freertos/task.h"
 #include "esp_timer.h"
 #include "math.h"
-#include "freertos/semphr.h"
 
 //#define STEP_DEBUG
 
@@ -95,9 +94,6 @@ typedef struct
     float dec = 100;        // decceleration in rad*second^-2
     uint32_t accSteps = 0;
     uint32_t decSteps = 0;
-    int32_t stepsRemaining = 0;
-    //uint64_t posActual = 0; //actual current pos incremented at every step
-    uint8_t statusPrev = DISABLED; //FIXME currently unused
     uint8_t status = DISABLED;
     bool dir = CW;
     bool runInfinite = false;
@@ -112,7 +108,6 @@ private:
     ctrl_var_t ctrl;
     esp_timer_handle_t dyingTimer;
     TaskHandle_t enTask;
-    SemaphoreHandle_t semaphore_isrVariables = NULL;
     uint64_t currentPos = 0; // absolute position
     bool timerStarted = 0;
 
@@ -213,9 +208,6 @@ public:
      */
     void setSpeedMm(uint32_t speed, uint16_t accT, uint16_t decT);
 
-    //CUSTOM: change speed while running
-    void changeSpeedMm(uint32_t speed);
-
     /**
      * @brief Set steps per 1 mm of linear movement
      *
@@ -280,4 +272,4 @@ public:
     void stop();
 };
 
-#endif
+#endif

main/CMakeLists.txt

@@ -8,6 +8,7 @@ idf_component_register(
         "display.cpp"
         "cutter.cpp"
         "switchesAnalog.cpp"
+		"stepper.cpp"
         "guide-stepper.cpp"
         "encoder.cpp"
     INCLUDE_DIRS 

main/config.hpp

@@ -85,7 +85,7 @@ extern "C" {
 //----- stepper config -----
 //--------------------------
 //enable stepper test mode (dont start control and encoder task)
-//#define STEPPER_TEST
+#define STEPPER_TEST
 #define STEPPER_STEP_PIN GPIO_NUM_18    //mos1
 #define STEPPER_DIR_PIN GPIO_NUM_16     //ST3
 #define STEPPER_EN_PIN GPIO_NUM_0       //not connected (-> stepper always on)

main/guide-stepper.cpp

@@ -7,11 +7,10 @@ extern "C"
 #include "driver/adc.h"
 }
 
-#include "DendoStepper.h"
+#include "stepper.hpp"
 #include "config.hpp"
 #include "guide-stepper.hpp"
 #include "encoder.hpp"
-#include "gpio_evaluateSwitch.hpp"
 
 
 
@@ -24,7 +23,7 @@ extern "C"
 #define STEPPER_TEST_TRAVEL 65     //mm
                                    //
 #define MIN_MM 0
-#define MAX_MM 110 //60
+#define MAX_MM 60 
 #define POS_MAX_STEPS MAX_MM * STEPPER_STEPS_PER_MM
 #define POS_MIN_STEPS MIN_MM * STEPPER_STEPS_PER_MM
 
@@ -32,9 +31,8 @@ extern "C"
 #define SPEED_MIN 2.0   //mm/s
 #define SPEED_MAX 60.0 //mm/s
 
-#define SPEED 10 //35, 100, 50 rev
+#define ACCEL_MS 100.0  //ms from 0 to max
-#define ACCEL_MS 800.0  //ms from 0 to max
+#define DECEL_MS 90.0   //ms from max to 0
-#define DECEL_MS 500.0   //ms from max to 0
 
 #define STEPPER_STEPS_PER_ROT 1600
 #define STEPPER_STEPS_PER_MM STEPPER_STEPS_PER_ROT/4
@@ -48,11 +46,9 @@ extern "C"
 //----------------------
 //----- variables ------
 //----------------------
-static DendoStepper step;
 static const char *TAG = "stepper"; //tag for logging
 
 static bool stepp_direction = true;
-static bool dir = true, dirPrev; //TODO local variables in travelSteps?
 static uint32_t posNow = 0;
 
 
@@ -60,114 +56,98 @@ static uint32_t posNow = 0;
 //----------------------
 //----- functions ------
 //----------------------
-//move axis certain Steps (relative) between left and right or reverse when negative
+////move axis certain Steps (relative) between left and right or reverse when negative
-void travelSteps(int stepsTarget){
+//void travelSteps(int stepsTarget){
-    //posNow = step.getPositionMm(); //not otherwise controlled, so no update necessary
+//    //posNow = step.getPositionMm(); //not otherwise controlled, so no update necessary
-    int stepsToGo, remaining;
+//    int stepsToGo, remaining;
-
+//
-    stepsToGo = abs(stepsTarget);
+//    stepsToGo = abs(stepsTarget);
-    if(stepsTarget < 0) stepp_direction = !stepp_direction; //invert direction in reverse mode
+//    if(stepsTarget < 0) stepp_direction = !stepp_direction; //invert direction in reverse mode
-
+//
-    
+//    while (stepsToGo != 0){
-    while (stepsToGo != 0){
+//        //--- currently moving right ---
-
+//        if (stepp_direction == true){               //currently moving right
-        //--- wait if direction changed ---
+//            remaining = POS_MAX_STEPS - posNow;     //calc remaining distance fom current position to limit
-        //if (dirPrev != dir){
+//            if (stepsToGo > remaining){             //new distance will exceed limit
-        //        ESP_LOGW(TAG, " dir-change detected - waiting for move to finish \n ");
+//                //....step.runAbs (POS_MAX_STEPS);        //move to limit
-        //        while(step.getState() != 1) vTaskDelay(1);  //wait for move to finish
+//                //....while(step.getState() != 1) vTaskDelay(1);  //wait for move to finish
-        //}
+//                posNow = POS_MAX_STEPS;
-
+//                stepp_direction = false;            //change current direction for next iteration
-        //--- currently moving right ---
+//                stepsToGo = stepsToGo - remaining;  //decrease target length by already traveled distance
-        if (stepp_direction == true){               //currently moving right
+//                ESP_LOGI(TAG, " --- moved to max -> change direction (L) --- \n ");
-            remaining = POS_MAX_STEPS - posNow;     //calc remaining distance fom current position to limit
+//            }
-            if (stepsToGo > remaining){             //new distance will exceed limit
+//            else {                                  //target distance does not reach the limit
-                step.runAbs (POS_MAX_STEPS);        //move to limit
+//                //....step.runAbs (posNow + stepsToGo);   //move by (remaining) distance to reach target length
-                dirPrev = dir;
+//                //....while(step.getState() != 1) vTaskDelay(1); //wait for move to finish
-                dir = 1;
+//                ESP_LOGD(TAG, "moving to %d\n", posNow+stepsToGo);
-                //while(step.getState() != 1) vTaskDelay(1);  //wait for move to finish
+//                posNow += stepsToGo;
-                posNow = POS_MAX_STEPS;
+//                stepsToGo = 0;                      //finished, reset target length (could as well exit loop/break)
-                stepp_direction = false;            //change current direction for next iteration
+//            }
-                stepsToGo = stepsToGo - remaining;  //decrease target length by already traveled distance
+//        }
-                ESP_LOGI(TAG, " --- moved to max -> change direction (L) --- \n ");
+//
-            }
+//        //--- currently moving left ---
-            else {                                  //target distance does not reach the limit
+//        else {
-                step.runAbs (posNow + stepsToGo);   //move by (remaining) distance to reach target length
+//            remaining = posNow - POS_MIN_STEPS;
-                dirPrev = dir;
+//            if (stepsToGo > remaining){
-                dir = 1;
+//                //....step.runAbs (POS_MIN_STEPS);
-                //-- dont wait for move to finish since moves in same direction get merged --
+//                //....while(step.getState() != 1) vTaskDelay(2);  //wait for move to finish
-                //while(step.getState() != 1) vTaskDelay(1); //wait for move to finish
+//                posNow = POS_MIN_STEPS;
-                ESP_LOGD(TAG, "moving to %d\n", posNow+stepsToGo);
+//                stepp_direction = true;
-                posNow += stepsToGo;
+//                stepsToGo = stepsToGo - remaining;
-                stepsToGo = 0;                      //finished, reset target length (could as well exit loop/break)
+//                ESP_LOGI(TAG, " --- moved to min -> change direction (R) --- \n ");
-            }
+//            }
-        }
+//            else {
-
+//                //....step.runAbs (posNow - stepsToGo);           //when moving left the coordinate has to be decreased
-        //--- currently moving left ---
+//                while(step.getState() != 1) vTaskDelay(2);  //wait for move to finish
-        else {
+//                ESP_LOGD(TAG, "moving to %d\n", posNow - stepsToGo);
-            remaining = posNow - POS_MIN_STEPS;
+//                posNow -= stepsToGo;
-            if (stepsToGo > remaining){
+//                stepsToGo = 0;
-                step.runAbs (POS_MIN_STEPS);
+//            }
-                dirPrev = dir;
+//        }
-                dir = 0;
+//    }
-                //while(step.getState() != 1) vTaskDelay(2);  //wait for move to finish
+//    if(stepsTarget < 0) stepp_direction = !stepp_direction; //undo inversion of stepp_direction after reverse mode is finished
-                posNow = POS_MIN_STEPS;
+//    return;
-                stepp_direction = true;
+//}
-                stepsToGo = stepsToGo - remaining;
+//
-                ESP_LOGI(TAG, " --- moved to min -> change direction (R) --- \n ");
+//
-            }
+////move axis certain Mm (relative) between left and right or reverse when negative
-            else {
+//void travelMm(int length){
-                step.runAbs (posNow - stepsToGo);           //when moving left the coordinate has to be decreased
+//    travelSteps(length * STEPPER_STEPS_PER_MM);
-                dirPrev = dir;
+//}
-                dir = 0;
+//
-                //-- dont wait for move to finish since moves in same direction get merged --
+//
-                //while(step.getState() != 1) vTaskDelay(2);  //wait for move to finish
+////define zero/start position 
-                ESP_LOGD(TAG, "moving to %d\n", posNow - stepsToGo);
+////currently crashes into hardware limitation for certain time 
-                posNow -= stepsToGo;
+////TODO: limit switch
-                stepsToGo = 0;
+//void home() {
-            }
+//    ESP_LOGW(TAG, "auto-home...");
-        }
+//    //....step.setSpeedMm(100, 500, 10);
-    }
+//    //....step.runInf(1);
-    if(stepsTarget < 0) stepp_direction = !stepp_direction; //undo inversion of stepp_direction after reverse mode is finished
+//    vTaskDelay(1500 / portTICK_PERIOD_MS);
-    return;
+//    //....step.stop();
-}
+//    //....step.resetAbsolute();
-
+//    ESP_LOGW(TAG, "auto-home finished");
-
+//}
-//move axis certain Mm (relative) between left and right or reverse when negative
-void travelMm(int length){
-    travelSteps(length * STEPPER_STEPS_PER_MM);
-}
-
-
-//define zero/start position 
-//currently crashes into hardware limitation for certain time 
-//TODO: limit switch
-void home() {
-    ESP_LOGW(TAG, "auto-home...");
-    step.setSpeedMm(100, 500, 10);
-    step.runInf(1);
-    vTaskDelay(1500 / portTICK_PERIOD_MS);
-    step.stop();
-    step.resetAbsolute();
-    ESP_LOGW(TAG, "auto-home finished");
-}
 
 
 //initialize/configure stepper instance
 void init_stepper() {
-    ESP_LOGW(TAG, "initializing stepper...");
+//    ESP_LOGW(TAG, "initializing stepper...");
-    DendoStepper_config_t step_cfg = {
+//    DendoStepper_config_t step_cfg = {
-        .stepPin = STEPPER_STEP_PIN,
+//        .stepPin = STEPPER_STEP_PIN,
-        .dirPin = STEPPER_DIR_PIN,
+//        .dirPin = STEPPER_DIR_PIN,
-        .enPin = STEPPER_EN_PIN,
+//        .enPin = STEPPER_EN_PIN,
-        .timer_group = TIMER_GROUP_0,
+//        .timer_group = TIMER_GROUP_0,
-        .timer_idx = TIMER_0,
+//        .timer_idx = TIMER_0,
-        .miStep = MICROSTEP_32,
+//        .miStep = MICROSTEP_32,
-        .stepAngle = 1.8};
+//        .stepAngle = 1.8};
-    step.config(&step_cfg);
+//    //....step.config(&step_cfg);
-    step.init();
+//    //....step.init();
+//
+//    //....step.setSpeed(1000, 1000, 1000); //random default speed
+//    //....step.setStepsPerMm(STEPPER_STEPS_PER_MM); //guide: 4mm/rot
 
-    step.setSpeed(1000, 1000, 1000); //random default speed
+	stepper_init();
-    step.setStepsPerMm(STEPPER_STEPS_PER_MM); //guide: 4mm/rot
 }
 
 
@@ -176,7 +156,7 @@ void updateSpeedFromAdc() {
     int potiRead = gpio_readAdc(ADC_CHANNEL_POTI); //0-4095 GPIO34
     double poti = potiRead/4095.0;
     int speed = poti*(SPEED_MAX-SPEED_MIN) + SPEED_MIN;
-    step.setSpeedMm(speed, ACCEL_MS, DECEL_MS);
+    //....step.setSpeedMm(speed, ACCEL_MS, DECEL_MS);
     ESP_LOGW(TAG, "poti: %d (%.2lf%%), set speed to: %d", potiRead, poti*100, speed);
 }
 
@@ -187,23 +167,8 @@ void updateSpeedFromAdc() {
 //----------------------------
 void task_stepper_test(void *pvParameter)
 {
-    init_stepper();
+	stepper_init();
-    home();
+	int state = 0;
-    step.setSpeedMm(SPEED, ACCEL_MS, DECEL_MS);
-	//--- move from left to right repeatedly ---
-    // while (1) {
-    //     updateSpeedFromAdc();
-    //     step.runPosMm(STEPPER_TEST_TRAVEL);
-    //     while(step.getState() != 1) vTaskDelay(2);
-    //     ESP_LOGI(TAG, "finished moving right => moving left");
-
-    //  10updateSpeedFromAdc();
-    //     step.runPosMm(-STEPPER_TEST_TRAVEL);
-    //     while(step.getState() != 1) vTaskDelay(2); //1=idle
-    //     ESP_LOGI(TAG, "finished moving left => moving right");
-    // }
-
-	//--- control stepper using preset buttons ---
 	while(1){
 		vTaskDelay(20 / portTICK_PERIOD_MS);
 
@@ -218,90 +183,105 @@ void task_stepper_test(void *pvParameter)
 		SW_CUT.handle();
 		SW_AUTO_CUT.handle();
 
+		//cycle through test commands with one button
 		if (SW_RESET.risingEdge) {
-			ESP_LOGI(TAG, "button - stop stepper\n ");
+			switch (state){
-			buzzer.beep(1, 1000, 100);
+				case 0:
-			step.stop();
+					stepper_setTargetPosMm(50);
-		}
+					//stepper_setTargetPosSteps(1000);
-		if (SW_PRESET1.risingEdge) {
+					state++;
-			ESP_LOGI(TAG, "button - moving right\n ");
+					break;
-			buzzer.beep(2, 300, 100);
+				case 1:
-			step.setSpeedMm(SPEED, ACCEL_MS, DECEL_MS);
+					stepper_setTargetPosMm(80);
-			step.runPosMm(15);
+					//stepper_setTargetPosSteps(100);
-		}
+					state++;
-		if (SW_PRESET3.risingEdge) {
+					break;
-			ESP_LOGI(TAG, "button - moving left\n ");
+				case 2:
-			buzzer.beep(1, 500, 100);
+					stepper_setTargetPosMm(20);
-			step.setSpeedMm(SPEED, ACCEL_MS, DECEL_MS);
+					//stepper_setTargetPosSteps(100);
-			step.runPosMm(-15);
+					state++;
-		}
+					break;
-		if (SW_PRESET2.risingEdge) {
+				case 3:
-			buzzer.beep(1, 100, 100);
+					stepper_setTargetPosMm(60);
-			ESP_LOGW(TAG, "button - current state: %d\n, pos: %llu", (int)step.getState(), step.getPositionMm());
+					//stepper_setTargetPosSteps(2000);
+					state = 0;
+					break;
+			}
 		}
 	}
+	//	if (SW_PRESET1.risingEdge) {
+	//		buzzer.beep(2, 300, 100);
+	//		stepperSw_setTargetSteps(1000);
+	//	}
+	//	if (SW_PRESET2.risingEdge) {
+	//		buzzer.beep(1, 500, 100);
+	//		stepperSw_setTargetSteps(10000);
+	//	}
+	//	if (SW_PRESET3.risingEdge) {
+	//		buzzer.beep(1, 100, 100);
+	//		stepperSw_setTargetSteps(30000);
+	//	}
 }
 
 
 
+
 //----------------------------
 //----- TASK stepper-ctl -----
 //----------------------------
 void task_stepper_ctl(void *pvParameter)
 {
-    //variables
+//    //variables
-    int encStepsNow = 0; //get curret steps of encoder
+//    int encStepsNow = 0; //get curret steps of encoder
-    int encStepsPrev = 0; //steps at last check
+//    int encStepsPrev = 0; //steps at last check
-    int encStepsDelta = 0; //steps changed since last iteration
+//    int encStepsDelta = 0; //steps changed since last iteration
-
+//
-    double cableLen = 0;
+//    double cableLen = 0;
-    double travelStepsExact = 0; //steps axis has to travel
+//    double travelStepsExact = 0; //steps axis has to travel
-    double travelStepsPartial = 0;
+//    double travelStepsPartial = 0;
-    int travelStepsFull = 0;
+//    int travelStepsFull = 0;
-    double travelMm = 0;
+//    double travelMm = 0;
-    double turns = 0;
+//    double turns = 0;
-
+//
-    float potiModifier;
+//    float potiModifier;
-
+//
-    init_stepper();
+//    init_stepper();
-    home();
+//    home();
-
+//
-    while(1){
+//    while(1){
-        //get current length
+//        //get current length
-        encStepsNow = encoder_getSteps();
+//        encStepsNow = encoder_getSteps();
-
+//
-        //calculate change
+//        //calculate change
-        encStepsDelta = encStepsNow - encStepsPrev; //FIXME MAJOR BUG: when resetting encoder/length in control task, diff will be huge!
+//        encStepsDelta = encStepsNow - encStepsPrev; //FIXME MAJOR BUG: when resetting encoder/length in control task, diff will be huge!
-
+//
-        //read potentiometer and normalize (0-1) to get a variable for testing
+//        //read potentiometer and normalize (0-1) to get a variable for testing
-        potiModifier = (float) gpio_readAdc(ADC_CHANNEL_POTI) / 4095; //0-4095 -> 0-1
+//        potiModifier = (float) gpio_readAdc(ADC_CHANNEL_POTI) / 4095; //0-4095 -> 0-1
-        //ESP_LOGI(TAG, "current poti-modifier = %f", potiModifier);
+//        //ESP_LOGI(TAG, "current poti-modifier = %f", potiModifier);
-        ESP_LOGI(TAG, "delaying stepper-ctl task by %.1f ms (poti value)", 2000 * potiModifier);
+//
-        vTaskDelay(2000 * potiModifier / portTICK_PERIOD_MS);
+//        //calculate steps to move
-
+//        cableLen = (double)encStepsDelta * 1000 / ENCODER_STEPS_PER_METER;
-        //calculate steps to move
+//        turns = cableLen / (PI * D_REEL);
-        cableLen = (double)encStepsDelta * 1000 / ENCODER_STEPS_PER_METER;
+//        travelMm = turns * D_CABLE;
-        turns = cableLen / (PI * D_REEL);
+//        travelStepsExact = travelMm * STEPPER_STEPS_PER_MM  +  travelStepsPartial; //convert mm to steps and add not moved partial steps
-        travelMm = turns * D_CABLE;
+//        travelStepsPartial = 0;
-        travelStepsExact = travelMm * STEPPER_STEPS_PER_MM  +  travelStepsPartial; //convert mm to steps and add not moved partial steps
+//        travelStepsFull = (int)travelStepsExact;
-        travelStepsPartial = 0;
+//
-        travelStepsFull = (int)travelStepsExact;
+//        //move axis when ready to move at least 1 step
-
+//        if (abs(travelStepsFull) > 1){
-        //move axis when ready to move at least 1 step
+//            travelStepsPartial = fmod(travelStepsExact, 1); //save remaining partial steps to be added in the next iteration
-        if (abs(travelStepsFull) > 1){
+//            ESP_LOGD(TAG, "cablelen=%.2lf, turns=%.2lf, travelMm=%.3lf, travelStepsExact: %.3lf, travelStepsFull=%d, partialStep=%.3lf", cableLen, turns, travelMm, travelStepsExact, travelStepsFull, travelStepsPartial);
-            travelStepsPartial = fmod(travelStepsExact, 1); //save remaining partial steps to be added in the next iteration
+//            ESP_LOGI(TAG, "MOVING %d steps", travelStepsFull);
-            ESP_LOGD(TAG, "cablelen=%.2lf, turns=%.2lf, travelMm=%.3lf, travelStepsExact: %.3lf, travelStepsFull=%d, partialStep=%.3lf", cableLen, turns, travelMm, travelStepsExact, travelStepsFull, travelStepsPartial);
+//            //TODO: calculate variable speed for smoother movement? for example intentionally lag behind and calculate speed according to buffered data
-            ESP_LOGI(TAG, "MOVING %d steps", travelStepsFull);
+//            //....step.setSpeedMm(35, 100, 50);
-            //TODO: calculate variable speed for smoother movement? for example intentionally lag behind and calculate speed according to buffered data
+//            //testing: get speed from poti
-            step.setSpeedMm(SPEED, ACCEL_MS, DECEL_MS);
+//            //step.setSpeedMm(35, 1000*potiModifier+1, 1000*potiModifier+1);
-            //testing: get speed from poti
+//            travelSteps(travelStepsExact);
-            //step.setSpeedMm(35, 1000*potiModifier+1, 1000*potiModifier+1);
+//            encStepsPrev = encStepsNow; //update previous length
-            travelSteps(travelStepsExact);
+//        }
-            encStepsPrev = encStepsNow; //update previous length
+//        else {
-        }
+//            //TODO use encoder queue to only run this check at encoder event?
-        else {
+//            vTaskDelay(2);
-            //TODO use encoder queue to only run this check at encoder event?
+//        }
-            vTaskDelay(2);
+//    }
-        }
-    }
 }

main/main.cpp

@@ -17,6 +17,8 @@ extern "C"
 #include "guide-stepper.hpp"
 #include "encoder.hpp"
 
+#include "stepper.hpp"
+
 
 //=================================
 //=========== functions ===========
@@ -87,18 +89,19 @@ extern "C" void app_main()
     esp_log_level_set("switches-analog", ESP_LOG_WARN);
     esp_log_level_set("control", ESP_LOG_INFO);
     esp_log_level_set("stepper", ESP_LOG_DEBUG);
-    esp_log_level_set("DendoStepper", ESP_LOG_DEBUG); //stepper lib
+    esp_log_level_set("Dendostepper", ESP_LOG_WARN); //stepper lib
     esp_log_level_set("calc", ESP_LOG_WARN); //stepper lib
 
 #ifdef STEPPER_TEST
     //create task for stepper testing
-    xTaskCreate(task_stepper_test, "task_stepper_test", configMINIMAL_STACK_SIZE * 3, NULL, 5, NULL);
+    xTaskCreate(task_stepper_test, "task_stepper_test", configMINIMAL_STACK_SIZE * 3, NULL, 2, NULL);
+    //xTaskCreate(task_stepper_debug, "task_stepper_test", configMINIMAL_STACK_SIZE * 3, NULL, 2, NULL);
 #else
     //create task for controlling the machine
-    xTaskCreate(task_control, "task_control", configMINIMAL_STACK_SIZE * 3, NULL, 5, NULL);
+    xTaskCreate(task_control, "task_control", configMINIMAL_STACK_SIZE * 3, NULL, 4, NULL);
 
-    //create task for controlling the machine
+    //create task for controlling the stepper
-    xTaskCreate(task_stepper_ctl, "task_stepper_ctl", configMINIMAL_STACK_SIZE * 5, NULL, 5, NULL);
+    xTaskCreate(task_stepper_ctl, "task_stepper_ctl", configMINIMAL_STACK_SIZE * 3, NULL, 2, NULL);
 #endif
 
     //create task for handling the buzzer

main/stepper.cpp

@@ -0,0 +1,249 @@
+//custom driver for stepper motor
+#include "config.hpp"
+#include "hal/timer_types.h"
+#include <cstdint>
+#include <inttypes.h>
+
+extern "C" {
+#include "driver/timer.h"
+#include "driver/gpio.h"
+#include "esp_log.h"
+}
+
+//config from config.hpp
+//#define STEPPER_STEP_PIN GPIO_NUM_18    //mos1
+//#define STEPPER_DIR_PIN GPIO_NUM_16     //ST3
+
+#define STEPPER_STEPS_PER_MM	200/2	//steps/mm
+#define STEPPER_SPEED_DEFAULT	20		//mm/s
+#define STEPPER_SPEED_MIN		4		//mm/s  - speed at which stepper immediately starts/stops
+#define STEPPER_ACCEL_INC		3		//steps/s per cycle 
+#define STEPPER_DECEL_INC		8		//steps/s per cycle
+
+
+#define TIMER_F 1000000ULL
+#define TICK_PER_S TIMER_S
+#define NS_TO_T_TICKS(x) (x)
+
+
+
+//========================
+//=== global variables ===
+//========================
+static const char *TAG = "stepper-ctl"; //tag for logging
+									
+bool direction = 1;
+bool directionTarget = 1;
+bool timerIsRunning = false;
+bool timer_isr(void *arg);
+
+static timer_group_t timerGroup = TIMER_GROUP_0;
+static timer_idx_t timerIdx = TIMER_0;
+
+//TODO the below variables can be moved to isr function once debug output is no longer needed
+static uint64_t posTarget = 0;
+static uint64_t posNow = 0;
+static uint64_t stepsToGo = 0;
+static uint32_t speedMin = STEPPER_SPEED_MIN * STEPPER_STEPS_PER_MM;
+static uint32_t speedNow = speedMin;
+static int debug = 0;
+static uint32_t speedTarget = STEPPER_SPEED_DEFAULT * STEPPER_STEPS_PER_MM;
+//TODO/NOTE increment actually has to be re-calculated every run to have linear accel (because also gets called faster/slower)
+static uint32_t decel_increment = STEPPER_DECEL_INC;
+static uint32_t accel_increment = STEPPER_ACCEL_INC;
+
+
+
+//======================
+//===== DEBUG task =====
+//======================
+void task_stepper_debug(void *pvParameter){
+	while (1){
+		ESP_LOGI("stepper-DEBUG",
+				"timer=%d "
+				"dir=%d "
+				"dirTarget=%d "
+				"posTarget=%llu "
+				"posNow=%llu "
+				"stepsToGo=%llu "
+				"speedNow=%u "
+				"speedTarget=%u "
+				"debug=%d ",
+
+				timerIsRunning,
+				direction, 
+				directionTarget, 
+				posTarget, 
+				posNow, 
+				stepsToGo,
+				speedNow,
+				speedTarget,
+				debug
+				);
+
+			vTaskDelay(300 / portTICK_PERIOD_MS);
+	}
+}
+
+
+
+//=====================
+//===== set speed =====
+//=====================
+void stepper_setSpeed(uint32_t speedMmPerS) {
+	ESP_LOGW(TAG, "set target speed from %u to %u mm/s  (%u steps/s)",
+			speedTarget, speedMmPerS, speedMmPerS * STEPPER_STEPS_PER_MM);
+	speedTarget = speedMmPerS * STEPPER_STEPS_PER_MM;
+}
+
+
+
+//==========================
+//== set target pos STEPS ==
+//==========================
+void stepper_setTargetPosSteps(uint64_t target_steps) {
+	ESP_LOGW(TAG, "update target position from %llu to %llu  steps (stepsNow: %llu", posTarget, target_steps, posNow);
+	posTarget = target_steps;
+
+  // Check if the timer is currently paused
+  if (!timerIsRunning){
+    // If the timer is paused, start it again with the updated targetSteps
+	timerIsRunning = true;
+	ESP_LOGW(TAG, "starting timer because did not run before");
+    ESP_ERROR_CHECK(timer_set_alarm_value(timerGroup, timerIdx, 1000));
+    //timer_set_counter_value(timerGroup, timerIdx, 1000);
+    ESP_ERROR_CHECK(timer_start(timerGroup, timerIdx));
+  }
+}
+
+
+
+//=========================
+//=== set target pos MM ===
+//=========================
+void stepper_setTargetPosMm(uint32_t posMm){
+	ESP_LOGW(TAG, "set target position to %u mm", posMm);
+	stepper_setTargetPosSteps(posMm * STEPPER_STEPS_PER_MM);
+}
+
+
+
+//========================
+//===== init stepper =====
+//========================
+void stepper_init(){
+	ESP_LOGW(TAG, "init - configure struct...");
+
+	// Configure pulse and direction pins as outputs
+	ESP_LOGW(TAG, "init - configure gpio pins...");
+	gpio_set_direction(STEPPER_DIR_PIN, GPIO_MODE_OUTPUT);
+	gpio_set_direction(STEPPER_STEP_PIN, GPIO_MODE_OUTPUT);
+
+	ESP_LOGW(TAG, "init - initialize/configure timer...");
+	timer_config_t timer_conf = {
+		.alarm_en = TIMER_ALARM_EN,         // we need alarm
+		.counter_en = TIMER_PAUSE,          // dont start now lol
+		.intr_type = TIMER_INTR_LEVEL,      // interrupt
+		.counter_dir = TIMER_COUNT_UP,      // count up duh
+		.auto_reload = TIMER_AUTORELOAD_EN, // reload pls
+		.divider = 80000000ULL / TIMER_F,   // ns resolution
+	};
+	ESP_ERROR_CHECK(timer_init(timerGroup, timerIdx, &timer_conf));                   // init the timer
+	ESP_ERROR_CHECK(timer_set_counter_value(timerGroup, timerIdx, 0));                // set it to 0
+	ESP_ERROR_CHECK(timer_isr_callback_add(timerGroup, timerIdx, timer_isr, (void *)timerIdx, 0));
+}
+
+
+
+//================================
+//=== timer interrupt function ===
+//================================
+bool timer_isr(void *arg) {
+
+	//-----------------
+	//--- variables ---
+	//-----------------
+	//TODO used (currently global) variables here
+
+	//-----------------------------------
+	//--- define direction, stepsToGo ---
+	//-----------------------------------
+	//Note: the idea is that the stepper has to decelerate to min speed first before changeing the direction
+	//define target direction depending on position difference
+	bool directionTarget = posTarget > posNow ? 1 : 0;
+	//DIRECTION DIFFERS (change)
+	if ( (direction != directionTarget) && (posTarget != posNow)) {
+		if (stepsToGo == 0){ //standstill
+			direction = directionTarget; //switch direction
+			gpio_set_level(STEPPER_DIR_PIN, direction);
+			stepsToGo = abs(int64_t(posTarget - posNow));
+		} else {
+			//set to minimun decel steps
+			stepsToGo = (speedNow - speedMin) / decel_increment;
+		}
+	}
+	//NORMAL (any direction 0/1)
+	else {
+		stepsToGo = abs(int64_t(posTarget - posNow));
+	}
+
+	//--------------------
+	//--- define speed ---
+	//--------------------
+	//FIXME noticed crash: division by 0 when min speed > target speed
+	uint64_t stepsDecelRemaining = (speedNow - speedMin) / decel_increment;
+	//DECELERATE
+	if (stepsToGo <= stepsDecelRemaining) {
+		//FIXME if stepsToGo gets updated (lowered) close to target while close to target, the stepper may stop too fast -> implement possibility to 'overshoot and reverse'?
+		if ((speedNow - speedMin) > decel_increment) {
+			speedNow -= decel_increment;
+		} else {
+			speedNow = speedMin; //PAUSE HERE??? / irrelevant?
+		}
+	}
+	//ACCELERATE
+	else if (speedNow < speedTarget) {
+		speedNow += accel_increment;
+		if (speedNow > speedTarget) speedNow = speedTarget;
+	}
+	//COASTING
+	else { //not relevant?
+		speedNow = speedTarget;
+	}
+
+	//-------------------------------
+	//--- update timer, increment ---
+	//-------------------------------
+	//AT TARGET -> STOP
+	if (stepsToGo == 0) {
+		timer_pause(timerGroup, timerIdx);
+		timerIsRunning = false;
+		speedNow = speedMin;
+		return 1;
+	}
+
+	//STEPS REMAINING -> NEXT STEP
+	//update timer with new speed
+	ESP_ERROR_CHECK(timer_set_alarm_value(timerGroup, timerIdx, TIMER_F / speedNow));
+
+	//generate pulse
+	GPIO.out_w1ts = (1ULL << STEPPER_STEP_PIN); //turn on (fast)
+	ets_delay_us(10);
+	GPIO.out_w1tc = (1ULL << STEPPER_STEP_PIN); //turn off (fast)
+
+	//increment pos
+	stepsToGo --;
+	if (direction == 1){
+		posNow ++;
+	} else {
+		//prevent underflow FIXME this case should not happen in the first place?
+		if (posNow != 0){
+			posNow --;
+		} else {
+			ESP_LOGE(TAG,"isr: posNow would be negative - ignoring decrement");
+		}
+	}
+	return 1;
+}
+
+

main/stepper.hpp

@@ -0,0 +1,13 @@
+#pragma once
+
+//init stepper pins and timer
+void stepper_init();
+//set absolute target position in steps
+void stepper_setTargetPosSteps(uint64_t steps);
+//set absolute target position in millimeters
+void stepper_setTargetPosMm(uint32_t posMm);
+//set target speed in millimeters per second
+void stepper_setSpeed(uint32_t speedMmPerS);
+
+//task that periodically logs variables for debugging stepper driver
+void task_stepper_debug(void *pvParameter);