pio: Add = and ? pin commands for easier GPIO operation

pio.c

@@ -149,9 +149,11 @@ static void usage(int rc )
 	fprintf(stderr, "usage: %s -i input [-o output] pin..\n", argv0);
 	fprintf(stderr,	"	print		Show all pins\n");
 	fprintf(stderr,	"	Pxx		Show pin\n");
-	fprintf(stderr,	"	Pxx<mode><pull><drive><data>\n			Configure pin\n");
+	fprintf(stderr,	"	Pxx<mode><pull><drive><data>\n		Configure pin\n");
+	fprintf(stderr,	"	Pxx=data,drive,pull\n			Configure GPIO output\n");
+	fprintf(stderr,	"	Pxx?pull\n				Configure GPIO input\n");
 	fprintf(stderr, "	clean		Clean input pins\n");
-	fprintf(stderr, "\n	mode 0-7, 0=input, 1=ouput, 2-7 I/O\n");
+	fprintf(stderr, "\n	mode 0-7, 0=input, 1=ouput, 2-7 I/O function\n");
 	fprintf(stderr, "	pull 0=none, 1=up, 2=down\n");
 	fprintf(stderr, "	drive 0-3, I/O drive level\n");
 	
@@ -196,29 +198,55 @@ static void cmd_set_pin(char *buf, const char *pin)
 	parse_pin(&port, &port_nr, pin);
 	if (!pio_get(buf, port, port_nr, &pio))
 		usage(1);
-	if (t)
-		t = strchr(t, '<');
-	if (t) {
-		t++;
-		parse_int(&pio.mul_sel, t);
-	}
-	if (t)
-		t = strchr(t, '<');
-	if (t) {
-		t++;
-		parse_int(&pio.pull, t);
-	}
-	if (t)
-		t = strchr(t, '<');
-	if (t) {
-		t++;
-		parse_int(&pio.drv_level, t);
-	}
-	if (t)
-		t = strchr(t, '<');
-	if (t) {
-		t++;
-		parse_int(&pio.data, t);
+	if ((t = strchr(pin, '='))) {
+		pio.mul_sel = 1;
+		if (t) {
+			t++;
+			parse_int(&pio.data, t);
+		}
+		if (t)
+			t = strchr(t, ',');
+		if (t) {
+			t++;
+			parse_int(&pio.drv_level, t);
+		}
+		if (t)
+			t = strchr(t, ',');
+		if (t) {
+			t++;
+			parse_int(&pio.pull, t);
+		}
+	} else if ((t = strchr(pin, '?'))) {
+		pio.mul_sel = 0;
+		pio.data = 0;
+		pio.drv_level = 0;
+		if (t) {
+			t++;
+			parse_int(&pio.pull, t);
+		}
+	} else if ((t = strchr(pin, '<'))) {
+		if (t) {
+			t++;
+			parse_int(&pio.mul_sel, t);
+		}
+		if (t)
+			t = strchr(t, '<');
+		if (t) {
+			t++;
+			parse_int(&pio.pull, t);
+		}
+		if (t)
+			t = strchr(t, '<');
+		if (t) {
+			t++;
+			parse_int(&pio.drv_level, t);
+		}
+		if (t)
+			t = strchr(t, '<');
+		if (t) {
+			t++;
+			parse_int(&pio.data, t);
+		}
 	}
 	pio_set(buf, port, port_nr, &pio);
 }