dummy volume delired readout

Core/Inc/PSE_unit.h

@@ -49,11 +49,13 @@ typedef struct{
   uint8_t enabled;
   pse_ports port; // physical port on which this unit is connected
   uint32_t flow; // flow (in µL.min-1)
-  uint32_t volume; // current volume dispensed (in µL)
+  int32_t volume; // current volume dispensed (in µL)
   uint32_t set_volume; // volume to stop at (0 for no max)
   pse_syringe* syringe; // associated syringe
   pse_stepper_conf* stepper_conf; // hardware configuration for the associated stepper
   pse_home_display* home_display; // Widgets for updating the home screen
+	int32_t start_pos; // movement start position for volume calculation
+	uint32_t nL_per_step; // pL delivered per step
 } pse_unit;
 
 
@@ -61,4 +63,6 @@ void load_units(pse_unit* units, pse_syringe* syringes, pse_stepper_conf* steppe
 void load_units_short(pse_unit* units, uint8_t unit_num, uint16_t ws_ind);
 void save_units(pse_unit* units, uint8_t unit_num, uint16_t ws_ind);
 
+void pse_unit_compute_volume_delivered(pse_unit* unit);
+void pse_unit_compute_volume_per_step(pse_unit* unit);
 #endif 

Core/Src/PSE_unit.c

@@ -121,3 +121,11 @@ void save_units(pse_unit* units, uint8_t unit_num, uint16_t ws_ind){
 	f_close(&saveFile);
 	free(filename);
 }
+
+void pse_unit_compute_volume_delivered(pse_unit* unit){
+	unit->volume = (int64_t)1 * (unit->stepper_conf->steps_counter - unit->start_pos) * unit->nL_per_step / 1000;
+}
+
+void pse_unit_compute_volume_per_step(pse_unit* unit){
+	unit->nL_per_step = 10;
+}

Core/Src/PSE_unit_edit_screen.c

@@ -33,6 +33,9 @@ static void back_button_handler(lv_event_t * e){
 		// update stepper pwm generation
 		pse_stepper_planer_compute_sps(c_pse_unit);
 
+		// compute volume delivered per steps
+		pse_unit_compute_volume_per_step(c_pse_unit);
+
 		// go back to the main menu
 		Home_Screen_Gen(c_pse_units, c_pse_units_num, true);
 	}

Core/Src/home_screen.c

@@ -7,6 +7,7 @@
 
 #include <stdint.h>
 #include <stdio.h>
+#include <stdlib.h>
 
 #include "lvgl.h"
 
@@ -20,6 +21,19 @@ static int units_num;
 static uint16_t workspace_index = 0;
 static lv_obj_t* ws_label;
 
+static lv_timer_t* volume_readout_update_timer;
+
+void volume_readout_update(lv_timer_t* timer){
+  for(int i = 0; i < units_num; i++){
+    if(units[i].enabled){
+      pse_home_display* disp = units[i].home_display;
+			pse_unit_compute_volume_delivered(&units[i]);
+      int32_t volume = units[i].volume;
+  		lv_label_set_text_fmt(disp->volume, "%d.%.3lu\nmL", volume / 1000, abs(volume) % 1000);
+    }
+  }
+}
+ 
 static void run_handler(lv_event_t * e){
 	lv_event_code_t code = lv_event_get_code(e);
 
@@ -31,10 +45,13 @@ static void run_handler(lv_event_t * e){
 			lv_label_set_text(label, LV_SYMBOL_PAUSE);
 			pse_sp_set_dir_all(units, units_num, 1);
 			pse_sp_start_all(units, units_num);
+
+			volume_readout_update_timer = lv_timer_create(volume_readout_update, 100,  NULL);
 		}
 		else{
 			lv_label_set_text(label, LV_SYMBOL_PLAY);
 			pse_sp_stop_all(units, units_num);
+			lv_timer_del(volume_readout_update_timer);
 		}
   }
 }
@@ -84,6 +101,7 @@ static void unit_widget_clicked_handler(lv_event_t* e){
 	lv_event_code_t code = lv_event_get_code(e);
 
 	if(code == LV_EVENT_CLICKED) {
+		if(volume_readout_update_timer != NULL) lv_timer_del(volume_readout_update_timer);
 		pse_unit* unit = lv_event_get_user_data(e);
 		PSE_unit_edit_screen_Gen(units, unit, units_num, workspace_index);
 	}
@@ -92,8 +110,8 @@ static void unit_widget_clicked_handler(lv_event_t* e){
 static void update_readouts_widgets(){
 	for(int i = 0; i < units_num; i++){
 		pse_unit* pse_unit = &units[i];
-		lv_label_set_text_fmt(pse_unit->home_display->flow, "%02lu.%03lu\nmL/mn", pse_unit->flow / 1000, pse_unit->flow % 1000);
+		lv_label_set_text_fmt(pse_unit->home_display->flow, "%u.%03u\nmL/mn", pse_unit->flow / 1000, pse_unit->flow % 1000);
-		lv_label_set_text_fmt(pse_unit->home_display->volume, "%lu.%lu\nmL", pse_unit->volume / 1000, pse_unit->volume % 1000);
+		// lv_label_set_text_fmt(pse_unit->home_display->volume, "%lu.%lu\nmL", pse_unit->volume / 1000, pse_unit->volume % 1000);
 
 		lv_obj_t* enabled = pse_unit->home_display->enabled;
 		lv_obj_t* enabled_label = lv_obj_get_child(enabled, 0);
@@ -143,14 +161,14 @@ static lv_obj_t* PSE_unit_widget(lv_obj_t* parent, pse_unit* pse_unit){
 	lv_obj_t* flow = lv_label_create(cont);
 	lv_obj_set_width(flow, lv_pct(100));
 	lv_obj_set_flex_grow(flow, 1);
-	lv_label_set_text_fmt(flow, "%02lu.%03lu\nmL/mn", pse_unit->flow / 1000, pse_unit->flow % 1000);
+	lv_label_set_text_fmt(flow, "%02u.%03u\nmL/mn", pse_unit->flow / 1000, pse_unit->flow % 1000);
 	pse_unit->home_display->flow = flow;
 
 	// volume delivered readout
 	lv_obj_t* vol = lv_label_create(cont);
 	lv_obj_set_width(vol, lv_pct(100));
 	lv_obj_set_flex_grow(vol, 1);
-	lv_label_set_text_fmt(vol, "%lu.%lu\nmL", pse_unit->volume / 1000, pse_unit->volume % 1000);
+	lv_label_set_text_fmt(vol, "%d.%03u\nmL", pse_unit->volume / 1000, abs(pse_unit->volume) % 1000);
 	pse_unit->home_display->volume = vol;
 
 	// home button