C-Netz: Fix TX polarity selection

2 files changed, 4 insertions, 4 deletions

diff --git a/src/cnetz/cnetz.c b/src/cnetz/cnetz.c
index b9b3a42..aa4a065 100644
--- a/src/cnetz/cnetz.c
+++ b/src/cnetz/cnetz.c
@@ -200,11 +200,11 @@ int cnetz_create(int kanal, enum cnetz_chan_type chan_type, const char *sounddev
 			abort();
 		}
 		break;
-	case 2:
+	case -1:
 		/* select cell 1 for negative polarity */
 		cnetz->cell_nr = 1;
 		cnetz->cell_auto = 0;
-		if (si[cnetz->cell_nr].flip_polarity != 0) {
+		if (si[cnetz->cell_nr].flip_polarity == 0) {
 			fprintf(stderr, "cell %d must have negative polarity, please fix!\n", cnetz->cell_nr);
 			abort();
 		}
diff --git a/src/cnetz/main.c b/src/cnetz/main.c
index acab04f..0410e87 100644
--- a/src/cnetz/main.c
+++ b/src/cnetz/main.c
@@ -64,9 +64,9 @@ void print_help(const char *arg0)
 	printf("        correct signal processing speed. After adjustment, the clock must match\n");
 	printf("        +- 1ppm or better. CORRECTING CLOCK SPEED IS REQUIRED! See\n");
 	printf("        documentation on how to measure correct value.\n");
-	printf(" -F --flip-polarity no | yes auto\n");
+	printf(" -F --flip-polarity no | yes | auto\n");
 	printf("        Flip polarity of transmitted FSK signal. If yes, the sound card\n");
-	printf("        generates a negative signal rather than a positive one. If auto, the");
+	printf("        generates a negative signal rather than a positive one. If auto, the\n");
 	printf("        base station generates two virtual base stations with both polarities.\n");
 	printf("        Once a mobile registers, the correct polarity is selected and used.\n");
 	printf("        (default = %s)\n", flip_polarity);