Add command for setting switches for potentiometry (pot_exp_start()). Add...

Add command for setting switches for potentiometry (pot_exp_start()). Add pot_experiment() for acquiring voltage measurements from RE input for potentiometry or OCP. (currently not called anywhere)

DSTAT-temp/src/experiment.c

@@ -237,6 +237,15 @@ void volt_exp_stop(void){
 	#endif
 }
 
+void pot_exp_start(void){
+	/**
+	 * All switches open.
+	 */
+	#if BOARD_VER_MAJOR == 1 && BOARD_VER_MINOR == 2
+		arch_ioport_set_port_level(IOPORT_PORTB, PIN2_bm|PIN3_bm|PIN4_bm|PIN5_bm, 0);
+	#endif
+}
+
 void precond(int16_t v1, uint16_t t1, int16_t v2, uint16_t t2){ //assumes potentiostat switches are already set
 	/**
 	 * Performs experiment preconditioning.
@@ -564,6 +573,67 @@ static void lsv_cca_callback(void){
 	return;
 }
 
+#if BOARD_VER_MAJOR == 1 && BOARD_VER_MINOR == 2
+
+void pot_experiment(uint16_t time_seconds){
+	/**
+	 * Performs a potentiometry experiment. Assumes either pot_exp_start() or ocp_exp_start() has been called and appropriate switches are set.
+	 *
+	 * @param time_seconds Time until automatic stop. If 0, can only be cancelled by abort signal.
+	 */
+	while (RTC.STATUS & RTC_SYNCBUSY_bm);
+	RTC.PER = 999;
+	while (RTC.STATUS & RTC_SYNCBUSY_bm);
+	RTC.CTRL = RTC_PRESCALER_DIV1_gc; //1ms tick
+	RTC.CNT = 0;
+	
+	EVSYS.CH0MUX = EVSYS_CHMUX_RTC_OVF_gc; //EV CH0 -- RTC overflow 1s
+	
+	portd_int0_callback = portd_int0_ca; //ADC interrupt
+	
+	tc_enable(&TCC0);
+	
+	ads1255_mux(ADS_MUX_POT);
+	ads1255_rdatac();
+	ads1255_wakeup();
+	
+	tc_write_period(&TCC0,0xffff);
+	tc_write_clock_source(&TCC0, TC_CLKSEL_EVCH0_gc);
+	tc_set_direction(&TCC0, TC_UP);
+	TCC0.CNT = 0;
+	
+	up = 1;
+	if (time_seconds >= 1){ //only enable interrupt if non-zero timeout specified
+		tc_set_cca_interrupt_callback(&TCC0, ca_cca_callback);
+		tc_write_cc(&TCC0, TC_CCA, time_seconds-1);
+		tc_enable_cc_channels(&TCC0, TC_CCAEN);
+		tc_set_cca_interrupt_level(&TCC0, TC_INT_LVL_MED);
+	}
+		
+	RTC.CNT=0;
+	PORTD.INTCTRL = PORT_INT0LVL_LO_gc;
+	
+	while (up !=0){
+		if (udi_cdc_is_rx_ready()){
+			if (getchar() == 'a'){
+				ca_cca_callback();
+				printf("##ABORT\n\r");
+				goto aborting;
+			}
+		}
+	}
+	
+	aborting:
+		tc_set_cca_interrupt_level(&TCC0, TC_INT_LVL_OFF);
+		tc_write_clock_source(&TCC0, TC_CLKSEL_OFF_gc);
+		tc_disable(&TCC0);
+		volt_exp_stop();
+		ads1255_standby();
+
+		return;
+}
+#endif
+
 void ca_experiment(uint16_t steps, uint16_t step_dac[], uint16_t step_seconds[]){
 	/**
 	 * Performs a chronoamperometry experiment.

DSTAT-temp/src/experiment.h

@@ -78,9 +78,15 @@ void pot_init(void);
 void pot_set_gain(void);
 void volt_exp_start(void);
 void volt_exp_stop(void);
+void pot_exp_start(void);
 void precond(int16_t v1, uint16_t t1, int16_t v2, uint16_t t2);
 void cv_experiment(int16_t v1, int16_t v2, int16_t start, uint8_t scans, uint16_t slope);
 uint8_t lsv_experiment(int16_t start, int16_t stop, uint16_t slope, int8_t first_run);
+
+#if BOARD_VER_MAJOR == 1 && BOARD_VER_MINOR == 2
+	void pot_experiment(uint16_t time_seconds);
+#endif
+
 void ca_experiment(uint16_t steps, uint16_t step_dac[], uint16_t step_seconds[]);
 void swv_experiment(int16_t start, int16_t stop, uint16_t step, uint16_t pulse_height, uint16_t frequency, uint16_t scans);
 void dpv_experiment(int16_t start, int16_t stop, uint16_t step, uint16_t pulse_height, uint16_t pulse_period, uint16_t pulse_width);