stop at set volume

Core/Inc/PSE_unit.h

@@ -14,37 +14,42 @@
 
 #include "lvgl.h"
 
+// syringe definition
 typedef struct{
   char name[16]; // brand / name
   uint16_t diameter; // diameter (in µm)
 } pse_syringe;
 
+// Ports available
 typedef enum {PORT_X, PORT_Y, PORT_Z, PORT_E} pse_ports;
 
+// stepper controller definitions
 typedef struct{
-	uint16_t tim_presc;
-	uint16_t tim_period;
+	uint16_t tim_presc; // timer prescaler
+	uint16_t tim_period; // timer period
 
-  uint32_t tick_counter;
   int32_t steps_counter;
-  uint8_t stopAtHome;
+	uint8_t stop_at_limit; // boolean to stop at stop_steps
+	int32_t stop_steps; // position to stop at
 
-  GPIO_TypeDef* EN_GPIO_Port;
+  GPIO_TypeDef* EN_GPIO_Port; // Pin definitions
   uint16_t EN_GPIO_Pin;
   GPIO_TypeDef* DIR_GPIO_Port;
   uint16_t DIR_GPIO_Pin;
   GPIO_TypeDef* STEP_GPIO_Port;
   uint16_t STEP_GPIO_Pin;
 
-  TIM_HandleTypeDef* tim;
+  TIM_HandleTypeDef* tim; // timer assigned to this unit
 } pse_stepper_conf;
 
+// readout widgets associated with this unit
 typedef struct{
 	lv_obj_t* flow;
 	lv_obj_t* volume;
 	lv_obj_t* enabled;
 } pse_home_display;
 
+// unit definition
 typedef struct{
   uint8_t enabled;
   pse_ports port; // physical port on which this unit is connected

Core/Src/PSE_unit_edit_screen.c

@@ -36,6 +36,13 @@ static void back_button_handler(lv_event_t * e){
 		// compute volume delivered per steps
 		pse_unit_compute_volume_per_step(c_pse_unit);
 
+		// set limit if volume defined
+		if(c_pse_unit->set_volume != 0){
+			c_pse_unit->stepper_conf->stop_at_limit = 1;
+			c_pse_unit->stepper_conf->stop_steps = (uint64_t)1000 * c_pse_unit->set_volume / c_pse_unit->nL_per_step;	}
+		else
+			c_pse_unit->stepper_conf->stop_at_limit = 0;
+
 		// go back to the main menu
 		Home_Screen_Gen(c_pse_units, c_pse_units_num, true);
 	}

Core/Src/home_screen.c

@@ -96,7 +96,8 @@ static void unit_home_handler(lv_event_t * e){
 		pse_unit* unit = lv_event_get_user_data(e);
 		pse_stepper_conf* c = unit->stepper_conf;
 		if(c->steps_counter == 0) return;
-		c->stopAtHome = 1;
+		c->stop_at_limit = 1;
+		c->stop_steps = 0;
 		pse_sp_jog_speed(c, 1);
 		pse_sp_set_dir(c, c->steps_counter < 0);
 		pse_sp_start_axis(c);

Core/Src/pse_stepper_planer.c

@@ -18,13 +18,15 @@ void pse_stepper_planer_tick(pse_unit* unit){
 
 	HAL_GPIO_TogglePin(c->STEP_GPIO_Port, c->STEP_GPIO_Pin);
 	c->steps_counter += (pse_sp_get_dir(c)?1:-1) * HAL_GPIO_ReadPin(c->STEP_GPIO_Port, c->STEP_GPIO_Pin);
-	if(c->stopAtHome && c->steps_counter == 0){
+	if(c->stop_at_limit && c->steps_counter == c->stop_steps){
 		pse_sp_jog_speed(c, 0);
 		pse_sp_stop_axis(c);
 	}
 }
 
 void pse_sp_start_axis(pse_stepper_conf* conf){
+	if(conf->stop_at_limit && conf->steps_counter == conf->stop_steps) return;
+	
 	HAL_GPIO_WritePin(conf->EN_GPIO_Port, conf->EN_GPIO_Pin, GPIO_PIN_RESET);
 	HAL_TIM_Base_Start_IT(conf->tim);
 }