Merge pull request #46 from davecrump/master

Add Control Script for Nyquist Filters in IQ Mode

scripts/a.sh

@@ -96,6 +96,7 @@ case "$MODE_OUTPUT" in
 	FREQUENCY_OUT=0
 	OUTPUT=videots
 	MODE=IQ
+	$PATHSCRIPT"/ctlfilter.sh"
 	#GAIN=0
 	;;
 	QPSKRF)

scripts/ctlfilter.sh

@@ -0,0 +1,91 @@
+########## ctlfilter.sh ############
+
+# Called by a.sh in IQ mode to switch in correct
+# Nyquist Filter
+
+############ Set Environment Variables ###############
+
+
+PATHSCRIPT=/home/pi/rpidatv/scripts
+CONFIGFILE=$PATHSCRIPT"/rpidatvconfig.txt"
+
+############### PIN DEFINITION ###########
+
+#filter_bit0 LSB of filter control word=GPIO 16 / Header 36  
+filter_bit0=16
+
+#filter_bit1 Mid Bit of filter control word=GPIO 26 / Header 37
+filter_bit1=26
+
+#filter_bit0 MSB of filter control word=GPIO 20 / Header 38
+filter_bit2=20
+
+gpio -g mode $filter_bit0 out
+gpio -g mode $filter_bit1 out
+gpio -g mode $filter_bit2 out
+
+############### Function to read Config File ###############
+
+get_config_var() {
+lua - "$1" "$2" <<EOF
+local key=assert(arg[1])
+local fn=assert(arg[2])
+local file=assert(io.open(fn))
+for line in file:lines() do
+local val = line:match("^#?%s*"..key.."=(.*)$")
+if (val ~= nil) then
+print(val)
+break
+end
+end
+EOF
+}
+
+############### Read Symbol Rate #########################
+
+SYMBOLRATEK=$(get_config_var symbolrate $CONFIGFILE)
+
+############### Switch GPIOs based on Symbol Rate ########
+
+case "$SYMBOLRATEK" in
+	125)
+                gpio -g write $filter_bit0 0;
+                gpio -g write $filter_bit1 0;
+		gpio -g write $filter_bit2 0;
+	;;
+	250)
+		gpio -g write $filter_bit0 1;
+                gpio -g write $filter_bit1 0;
+                gpio -g write $filter_bit2 0;
+	;;
+	333)
+                gpio -g write $filter_bit0 0;
+                gpio -g write $filter_bit1 1;
+                gpio -g write $filter_bit2 0;
+        ;;
+        500)
+                gpio -g write $filter_bit0 1;
+                gpio -g write $filter_bit1 1;
+                gpio -g write $filter_bit2 0;
+	;;
+        1000)
+                gpio -g write $filter_bit0 0;
+                gpio -g write $filter_bit1 0;
+                gpio -g write $filter_bit2 1;
+        ;;
+        2000)
+                gpio -g write $filter_bit0 1;
+                gpio -g write $filter_bit1 0;
+                gpio -g write $filter_bit2 1;
+        ;;
+	*)
+                gpio -g write $filter_bit0 1;
+                gpio -g write $filter_bit1 0;
+                gpio -g write $filter_bit2 1;
+	;;
+esac
+
+### End ###
+
+# Revert to a.sh #
+