global config to set last 4 or 1 values used when calculating servo signals

ChangeLog

@@ -3,7 +3,8 @@
     minimum battery voltage set to 2V for those experimenting with 1S cell
     PPM length shortened to "NUM_CHANNELS x 2ms + 5ms" to send new data
 	to receiver as soon as possible
-    ADC measuring every 1ms, averaging last 4 samples when used
+    ADC measuring every 1ms, averaging last 4 samples when used,
+	globally settable to use last 4/1 values
     at poweron, if steering or throttle are not in center dead zone,
 	beep 3 times
     added poweron beep, can be set ON/OFF in global config

MANUAL.txt

@@ -225,6 +225,7 @@ Global setup menu:
 		  for values greater than 120%
     1		dead zone for steering		0...50
     2		dead zone for throttle		0...50
+    o		use last 4 or 1 ADC values	OVS/LST
     b		key beep			OFF/ON
     C		center/reset beep		OFF/ON
     P		poweron beep			OFF/ON

calc.c

@@ -265,12 +265,25 @@ static void calc_loop(void) {
     s16 val, val2;
     u8  i, bit;
     s16 DIG_mix;
+    u16 adc_steering, adc_throttle;  // last 4 or 1 ADC values
 
     while (1) {
 	DIG_mix = menu_DIG_mix * PPM(5);  // to -5000..5000 range
 
+	// set used ADC values
+	if (cg.adc_ovs_last) {
+	    // last value
+	    adc_steering = adc_steering_last << ADC_OVS_SHIFT;
+	    adc_throttle = adc_throttle_last << ADC_OVS_SHIFT;
+	}
+	else {
+	    // oversampled last 4 values
+	    adc_steering = adc_steering_ovs;
+	    adc_throttle = adc_throttle_ovs;
+	}
+
 	// steering
-	val = channel_calib(adc_steering_ovs,
+	val = channel_calib(adc_steering,
 			    cg.calib_steering_left << ADC_OVS_SHIFT,
 			    cg.calib_steering_mid << ADC_OVS_SHIFT,
 			    cg.calib_steering_right << ADC_OVS_SHIFT,
@@ -330,7 +343,7 @@ static void calc_loop(void) {
 
 
 	// throttle
-	val = channel_calib(adc_throttle_ovs,
+	val = channel_calib(adc_throttle,
 			    cg.calib_throttle_fwd << ADC_OVS_SHIFT,
 			    cg.calib_throttle_mid << ADC_OVS_SHIFT,
 			    cg.calib_throttle_bck << ADC_OVS_SHIFT,

config.c

@@ -55,7 +55,7 @@ u8 config_global_set_default(void) {
     cg.key_beep		= 1;
     cg.reset_beep	= 1;
     cg.poweron_beep	= 1;
-    cg.unused		= 0;
+    cg.adc_ovs_last	= 0;		// use oversampled value in CALC
 
     // set calibrate values only when they are out of limits
     cc |= check_val(&cg.calib_steering_left, 0, CALIB_ST_LOW_MID, 0);

config.h

@@ -53,7 +53,7 @@ typedef struct {
     u8	key_beep:1;		// beep on key press
     u8	reset_beep:1;		// beep on center/reset value
     u8	poweron_beep:1;		// beep on power on
-    u8	unused:1;
+    u8	adc_ovs_last:1;		// use oversampled (0) or last (1) value in CALC
 } config_global_s;
 
 extern config_global_s config_global;

menu_global.c

@@ -237,6 +237,18 @@ static void gs_throttle_dead(u8 change) {
 }
 
 
+static void gs_adc_ovs_last(u8 change) {
+    if (change == 0xff) {
+	lcd_set(L7SEG, LB_EMPTY);
+	return;
+    }
+    if (change)  cg.adc_ovs_last ^= 1;
+    lcd_7seg(L7_O);
+    if (cg.adc_ovs_last)  lcd_chars("LST");
+    else		  lcd_chars("OVS");
+}
+
+
 static _Bool gs_reset_flag;
 static void gs_reset_all(u8 change) {
     if (change == 0xff) {
@@ -287,6 +299,7 @@ static const global_setup_t gs_config[] = {
     gs_endpoint_max,
     gs_steering_dead,
     gs_throttle_dead,
+    gs_adc_ovs_last,
     gs_key_beep,
     gs_reset_beep,
     gs_poweron_beep,