diff --git a/lib/busvoodoo_onewire.c b/lib/busvoodoo_onewire.c
index 140927a..869d074 100644
--- a/lib/busvoodoo_onewire.c
+++ b/lib/busvoodoo_onewire.c
@@ -65,8 +65,8 @@ static bool busvoodoo_onewire_setup(char** prefix, const char* line)
 	switch (busvoodoo_onewire_setting) {
 		case BUSVOODOO_ONEWIRE_SETTING_NONE:
 			busvoodoo_onewire_setting = BUSVOODOO_ONEWIRE_SETTING_PULLUP; // go to first setting
-			printf("1) use embedded pull-up resistor (2kO)\n");
-			printf("2) use external pull-up resistor\n");
+			puts("1) use embedded pull-up resistor (2kO)\n");
+			puts("2) use external pull-up resistor\n");
 			snprintf(busvoodoo_global_string, LENGTH(busvoodoo_global_string), "pull-up mode (1,2) [%c]", busvoodoo_onewire_embedded_pullup ? '1' : '2'); // show pull-up setting
 			*prefix = busvoodoo_global_string; // display next setting
 			break;
@@ -81,8 +81,8 @@ static bool busvoodoo_onewire_setup(char** prefix, const char* line)
 				}
 			}
 			if (BUSVOODOO_ONEWIRE_SETTING_POWER==busvoodoo_onewire_setting) {
-				printf("1) don't drive 1-wire data line (target uses external or parasitic power)\n");
-				printf("2) power 1-wire data line at 3.3V when not communicating (not multi-master compatible)\n");
+				puts("1) don't drive 1-wire data line (target uses external or parasitic power)\n");
+				puts("2) power 1-wire data line at 3.3V when not communicating (not multi-master compatible)\n");
 				snprintf(busvoodoo_global_string, LENGTH(busvoodoo_global_string), "power source (1,2) [%c]", busvoodoo_onewire_power ? '2' : '1'); // show power setting
 				*prefix = busvoodoo_global_string; // display next setting
 			}
@@ -107,7 +107,7 @@ static bool busvoodoo_onewire_setup(char** prefix, const char* line)
 					if (!busvoodoo_onewire_power) {
 						busvoodoo_embedded_pullup(true); // set embedded pull-ups
 					}
-					printf("use LV to set pull-up voltage\n");
+					puts("use LV to set pull-up voltage\n");
 				}
 				busvoodoo_led_blue_off(); // disable blue LED because there is no activity
 				busvoodoo_onewire_setting = BUSVOODOO_ONEWIRE_SETTING_NONE; // restart settings next time
@@ -145,9 +145,9 @@ static void busvoodoo_onewire_write(uint8_t value)
 	printf("write: 0x%02x", value);
 	busvoodoo_led_blue_pulse(BUSVOODOO_LED_PULSE); // pulse blue LED to show we are writing
 	if (!onewire_master_write_byte(value)) { // send data bytes
-		printf(" (error)");
+		puts(" (error)");
 	}
-	printf("\n");
+	putc('\n');
 }
 
 /** read from 1-wire
@@ -200,7 +200,7 @@ static bool busvoodoo_onewire_action(const char* action, uint32_t repetition, bo
 		//if (!gpio_get(GPIO(ONEWIRE_MASTER_PORT), GPIO(ONEWIRE_MASTER_PIN))) {
 		//	printf("WARNING: data line does not seem to be pulled up\n");
 		//}
-		printf("start transaction: ");
+		puts("start transaction: ");
 		bool presence = onewire_master_reset(); // send reset pulse and detect slave presence
 		printf("slave presence %sdetected\n", presence ? "" : "not ");
 	} else if (1 == length && ']' == action[0]) { // stop transaction
@@ -302,16 +302,16 @@ static bool busvoodoo_onewire_action(const char* action, uint32_t repetition, bo
 static void busvoodoo_onewire_command_actions(void* argument)
 {
 	if (NULL == argument || 0 == strlen(argument)) {
-		printf("available actions (separated by space or ,):\n");
-		printf("[\tstart transaction: send reset pulse and detect slave presence\n");
+		puts("available actions (separated by space or ,):\n");
+		puts("[\tstart transaction: send reset pulse and detect slave presence\n");
 		printf("]\tend transaction%s\n", busvoodoo_onewire_power ? " and provide power on data line" : "");
-		printf("0\twrite decimal byte\n");
-		printf("0x0\twrite hexadecimal byte\n");
-		printf("0b0\twrite binary byte\n");
-		printf("\"a\"/'a'\twrite ASCII characters\n");
-		printf("r\tread byte\n");
-		printf("u/m\twait 1 us/ms\n");
-		printf(":n\trepeat action n times\n");
+		puts("0\twrite decimal byte\n");
+		puts("0x0\twrite hexadecimal byte\n");
+		puts("0b0\twrite binary byte\n");
+		puts("\"a\"/'a'\twrite ASCII characters\n");
+		puts("r\tread byte\n");
+		puts("u/m\twait 1 us/ms\n");
+		puts(":n\trepeat action n times\n");
 		return;
 	}
 	// copy argument since it will be modified
@@ -322,7 +322,7 @@ static void busvoodoo_onewire_command_actions(void* argument)
 	strncpy(copy, argument, strlen(argument)+1);
 	// verify and perform actions
 	if (!busvoodoo_global_actions(copy, false, &busvoodoo_onewire_action)) { // verify actions
-		printf("malformed action(s)\n");
+		puts("malformed action(s)\n");
 	} else { // action are OK
 		busvoodoo_global_actions(argument, true, &busvoodoo_onewire_action); // perform action
 	}