diff --git a/application.c b/application.c
index 6481dfe..cde1c8b 100644
--- a/application.c
+++ b/application.c
@@ -52,19 +52,9 @@ static volatile bool second_flag = false; /**< flag set when a second passed */
 static uint32_t boot_time = 0;
 
 #define TARGET_CHANNEL 1 /**< PA1/ADC1_IN1 used to measure target voltage */
-#define SIGNAL_CHANNEL 2 /**< PA2/ADC1_IN2 used to measure signal voltage */
-const uint8_t adc_channels[] = {ADC_CHANNEL17, ADC_CHANNEL(TARGET_CHANNEL), ADC_CHANNEL(SIGNAL_CHANNEL)}; /**< voltages to convert (channel 17 = internal voltage reference) */
-
-#define SIGNAL_PD_PIN PA3 /**< pin to pull signal low for voltage measurement */
-#define SIGNAL_PU_PIN PA4 /**< pin to pull signal to target voltage (controlling gate of pMOS) */
+const uint8_t adc_channels[] = {ADC_CHANNEL17, ADC_CHANNEL(TARGET_CHANNEL)}; /**< voltages to convert (channel 17 = internal voltage reference) */
 #define TARGET_EN PA5 /**< pin to provide target voltage to LV side of voltage shifter (pulling them high through 10 kO) */
 
-#define MUX_EN_PIN PB2 /**< pin to enable analog multiplexer (active low) */
-#define MUX_S0_PIN PB1 /**< pin to set S0 bit of analog multiplexer */
-#define MUX_S1_PIN PB0 /**< pin to set S1 bit of analog multiplexer */
-#define MUX_S2_PIN PA7 /**< pin to set S2 bit of analog multiplexer */
-#define MUX_S3_PIN PA6 /**< pin to set S3 bit of analog multiplexer */
-
 #define CHANNEL_NUMBERS 16 /**< number of target signals */
 static const uint32_t channel_ports[] = {GPIO_PORT(PB12), GPIO_PORT(PB13), GPIO_PORT(PB14), GPIO_PORT(PB15), GPIO_PORT(PA8), GPIO_PORT(PA9), GPIO_PORT(PA10), GPIO_PORT(PA15), GPIO_PORT(PB3), GPIO_PORT(PB4), GPIO_PORT(PB5), GPIO_PORT(PB6), GPIO_PORT(PB7), GPIO_PORT(PB8), GPIO_PORT(PB9), GPIO_PORT(PB10)}; /**< GPIO ports for signal pin */
 static const uint32_t channel_pins[] = {GPIO_PIN(PB12), GPIO_PIN(PB13), GPIO_PIN(PB14), GPIO_PIN(PB15), GPIO_PIN(PA8), GPIO_PIN(PA9), GPIO_PIN(PA10), GPIO_PIN(PA15), GPIO_PIN(PB3), GPIO_PIN(PB4), GPIO_PIN(PB5), GPIO_PIN(PB6), GPIO_PIN(PB7), GPIO_PIN(PB8), GPIO_PIN(PB9), GPIO_PIN(PB10)}; /**< GPIO pins for signal pin */
@@ -167,24 +157,6 @@ static float* measure_voltages(void)
 	return voltages;
 }
 
-/** measure and print target voltage */
-static void print_target(void)
-{
-	gpio_set(GPIO_PORT(SIGNAL_PU_PIN), GPIO_PIN(SIGNAL_PU_PIN)); // ensure we are not pulling up the signal
-	gpio_set(GPIO_PORT(SIGNAL_PD_PIN), GPIO_PIN(SIGNAL_PD_PIN)); // ensure we are not pulling down the signal
-	gpio_set(GPIO_PORT(TARGET_EN), GPIO_PIN(TARGET_EN)); // ensure the level shifters pulling up the signals are not enabled
-	float* voltages = measure_voltages(); // measure voltages
-	puts("target voltage: ");
-	print_fpu(voltages[1], 2);
-	puts(" V");
-	if (voltages[1] > 3.25) {
-		puts(" (warning: signal voltage may exceed 3.30 V limit)");
-	} else if (voltages[1] < 1.0) {
-		puts(" (warning: target voltage seems not connected)");
-	}
-	putc('\n');
-}
-
 /** print decoded IDCODE
  *  @param[in] idcode IDCODE to decode
  */
@@ -198,40 +170,28 @@ static void print_idcode(uint32_t idcode)
 	       (idcode >> 28) & 0x0f);
 }
 
-/** select channel of multiplexer
- *  @param[in] channel channel to select, or -1 to disable multiplexer
+// menu commands
+
+/** measure and print target voltage
+ *  @param[in] argument not used
  */
-static void mux_select(int8_t channel)
+static void command_target_voltage(void* argument)
 {
-	gpio_set(GPIO_PORT(MUX_EN_PIN), GPIO_PIN(MUX_EN_PIN)); // disable multiplexer while we are switching
-	if (channel < 0 || channel > 15 || (channel > CHANNEL_NUMBERS - 1)) {
-		return; // no channel to select
+	(void)argument; // we won't use the argument
+
+	gpio_set(GPIO_PORT(TARGET_EN), GPIO_PIN(TARGET_EN)); // ensure the level shifters pulling up the signals are not enabled
+	float* voltages = measure_voltages(); // measure voltages
+	puts("target voltage: ");
+	print_fpu(voltages[1], 2);
+	puts(" V");
+	if (voltages[1] > 3.25) {
+		puts(" (warning: signal voltage may exceed 3.30 V limit)");
+	} else if (voltages[1] < 1.0) {
+		puts(" (warning: target voltage seems not connected)");
 	}
-	// select channel using bit pattern
-	if (channel & 0x1) {
-		gpio_set(GPIO_PORT(MUX_S0_PIN), GPIO_PIN(MUX_S0_PIN));
-	} else {
-		gpio_clear(GPIO_PORT(MUX_S0_PIN), GPIO_PIN(MUX_S0_PIN));
-	}
-	if (channel & 0x2) {
-		gpio_set(GPIO_PORT(MUX_S1_PIN), GPIO_PIN(MUX_S1_PIN));
-	} else {
-		gpio_clear(GPIO_PORT(MUX_S1_PIN), GPIO_PIN(MUX_S1_PIN));
-	}
-	if (channel & 0x4) {
-		gpio_set(GPIO_PORT(MUX_S2_PIN), GPIO_PIN(MUX_S2_PIN));
-	} else {
-		gpio_clear(GPIO_PORT(MUX_S2_PIN), GPIO_PIN(MUX_S2_PIN));
-	}
-	if (channel & 0x8) {
-		gpio_set(GPIO_PORT(MUX_S3_PIN), GPIO_PIN(MUX_S3_PIN));
-	} else {
-		gpio_clear(GPIO_PORT(MUX_S3_PIN), GPIO_PIN(MUX_S3_PIN));
-	}
-	gpio_clear(GPIO_PORT(MUX_EN_PIN), GPIO_PIN(MUX_EN_PIN)); // enable multiplexer
+	putc('\n');
 }
 
-// menu commands
 
 static void command_swd_scan(void* argument)
 {
@@ -243,9 +203,6 @@ static void command_swd_scan(void* argument)
 		return;
 	}
 
-	mux_select(-1); // disable multiplexer
-	gpio_set(GPIO_PORT(SIGNAL_PU_PIN), GPIO_PIN(SIGNAL_PU_PIN)); // ensure we are not pulling up the signal
-	gpio_set(GPIO_PORT(SIGNAL_PD_PIN), GPIO_PIN(SIGNAL_PD_PIN)); // ensure we are not pulling down the signal
 	gpio_clear(GPIO_PORT(TARGET_EN), GPIO_PIN(TARGET_EN)); // power level shifter
 	sleep_us(100); // wait a tiny bit for the pull-up to be active
 
@@ -386,9 +343,6 @@ static void command_jtag_scan(void* argument)
 		return;
 	}
 
-	mux_select(-1); // disable multiplexer
-	gpio_set(GPIO_PORT(SIGNAL_PU_PIN), GPIO_PIN(SIGNAL_PU_PIN)); // ensure we are not pulling up the signal
-	gpio_set(GPIO_PORT(SIGNAL_PD_PIN), GPIO_PIN(SIGNAL_PD_PIN)); // ensure we are not pulling down the signal
 	gpio_clear(GPIO_PORT(TARGET_EN), GPIO_PIN(TARGET_EN)); // power level shifter
 	sleep_us(100); // wait a tiny bit for the pull-up to be active
 
@@ -556,107 +510,6 @@ static void command_jtag_scan(void* argument)
 	putc('\n'); // all combinations completed
 }
 
-static void command_voltages(void* argument)
-{
-	(void)argument; // we won't use the argument
-	float* voltages;
-	print_target(); // print target voltage (also sets measurement conditions)
-	puts("signal voltages:\n");
-	for (uint8_t i = channel_start; i <= channel_stop; i++) {
-		printf("- CH%02u ", i);
-		mux_select(i); // select the channel
-		voltages = measure_voltages(); // measure raw voltages
-		print_fpu(voltages[2], 2);
-		puts(" V\n");
-	}
-}
-
-/** identify if signal is an input or output
- *  @param[in] argument no argument required
- */
-static void command_types(void* argument)
-{
-	(void)argument; // we won't use the argument
-	print_target(); // print target voltage (also sets measurement conditions)
-	float* voltages = measure_voltages(); // measure voltages
-	if (voltages[1] < 0.5) { // check target voltage connection
-		puts("connect target voltage to test channel type\n");
-		return;
-	}
-
-	puts("signal voltage  pulled  pull-up pulled pull-down signal\n");
-	puts(" name  raw (V) down (V) (kOhm)  up (V)  (kOhm)    type \n");
-
-	// just to be sure, reset measurement conditions
-	gpio_set(GPIO_PORT(SIGNAL_PD_PIN), GPIO_PIN(SIGNAL_PD_PIN)); // ensure pull-down is not active
-	gpio_set(GPIO_PORT(SIGNAL_PU_PIN), GPIO_PIN(SIGNAL_PU_PIN)); // ensure pull-up is not active
-	gpio_set(GPIO_PORT(TARGET_EN), GPIO_PIN(TARGET_EN)); // ensure the level shifters pulling up the signals are not enabled
-
-	for (uint8_t i = channel_start; i <= channel_stop; i++) {
-		printf("CH%02u", i);
-		puts("    ");
-		mux_select(i); // select the channel
-		voltages = measure_voltages(); // measure raw voltages
-		print_fpu(voltages[2], 2);
-		const float raw = voltages[2]; // remember un-pulled voltage
-		puts("    ");
-
-		gpio_clear(GPIO_PORT(SIGNAL_PD_PIN), GPIO_PIN(SIGNAL_PD_PIN)); // pull down signal
-		sleep_us(10); // wait a tiny bit for voltage to settle
-		voltages = measure_voltages(); // measure pulled down voltages
-		gpio_set(GPIO_PORT(SIGNAL_PD_PIN), GPIO_PIN(SIGNAL_PD_PIN)); // remove pull-down
-		voltages[2] *= 2.0; // pulling creates a voltage divider (to ground)
-		const bool low = (voltages[2] < 0.5); // remember if we were able to pull it down
-		const float pullup = (2000.0 * (raw - voltages[2]) / voltages[2]) / 1000.0; // estimate external pull-up
-		print_fpu(voltages[2], 2);
-		puts("     ");
-		if (pullup > 100.0) {
-			puts(">100");
-		} else if (pullup < 1.0) {
-			puts(" <1 ");
-		} else {
-			printf(" %02u ", (uint32_t)round(pullup));
-		}
-		puts("    ");
-
-		gpio_clear(GPIO_PORT(SIGNAL_PU_PIN), GPIO_PIN(SIGNAL_PU_PIN)); // pull up signal
-		sleep_us(10); // wait a tiny bit for voltage to settle
-		voltages = measure_voltages(); // measure pulled up voltages
-		gpio_set(GPIO_PORT(SIGNAL_PU_PIN), GPIO_PIN(SIGNAL_PU_PIN)); // remove pull-up
-		voltages[2] = voltages[2] *  2.0 - voltages[1]; // pulling creates a voltage divider (to target)
-		const bool high = (voltages[2] > 3.2 || voltages[2] > voltages[1] * 0.5); // remember if we were able to pull it up
-		const float pulldown = (2000.0 * voltages[2] / (voltages[1] - voltages[2])) / 1000.0; // estimate external pull-down
-		print_fpu(voltages[2], 2);
-		puts("    ");
-		if (pulldown > 100.0) {
-			puts(">100");
-		} else if (pulldown < 1.0) {
-			puts(" <1 ");
-		} else {
-			printf(" %02u ", (uint32_t)round(pulldown));
-		}
-		puts("    ");
-
-		if (low && high) {
-			if (pullup > 1.0 && pullup < 100.0 && (pulldown < 1.0 || pulldown > 100.0)) {
-				puts("pulled-up");
-			} else if (pulldown > 1.0 && pulldown < 100.0 && (pullup < 1.0 || pullup > 100.0)) {
-				puts("pulled-down");
-			} else {
-				puts("floating");
-			}
-		} else if (low) {
-			puts("low");
-		} else if (high) {
-			puts("high");
-		} else {
-			puts("unknown");
-		}
-		putc('\n');
-	}
-	mux_select(-1); // disable multiplexer
-}
-
 /** set first channel of range to scan
  *  @param[in] argument optional pointer to first channel number
  */
@@ -955,18 +808,10 @@ static const struct menu_command_t menu_commands[] = {
 	{
 		.shortcut = 'v',
 		.name = "voltage",
-		.command_description = "measure target and signal voltages",
+		.command_description = "measure target voltage",
 		.argument = MENU_ARGUMENT_NONE,
 		.argument_description = NULL,
-		.command_handler = &command_voltages,
-	},
-	{
-		.shortcut = 't',
-		.name = "type",
-		.command_description = "identify signal types",
-		.argument = MENU_ARGUMENT_NONE,
-		.argument_description = NULL,
-		.command_handler = &command_types,
+		.command_handler = &command_target_voltage,
 	},
 	{
 		.shortcut = 'c',
@@ -1118,44 +963,12 @@ void main(void)
 	puts("OK\n");
 
 	puts("setup voltage control: ");
-	rcc_periph_clock_enable(GPIO_RCC(SIGNAL_PD_PIN)); // enable clock for port domain
-	gpio_set(GPIO_PORT(SIGNAL_PD_PIN), GPIO_PIN(SIGNAL_PD_PIN)); // ensure we are not draining it
-	gpio_set_output_options(GPIO_PORT(SIGNAL_PD_PIN), GPIO_OTYPE_OD, GPIO_OSPEED_2MHZ, GPIO_PIN(SIGNAL_PD_PIN)); // set output as open-drain
-	gpio_mode_setup(GPIO_PORT(SIGNAL_PD_PIN), GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO_PIN(SIGNAL_PD_PIN)); // configure pin as output
-	rcc_periph_clock_enable(GPIO_RCC(SIGNAL_PU_PIN)); // enable clock for port domain
-	gpio_set(GPIO_PORT(SIGNAL_PU_PIN), GPIO_PIN(SIGNAL_PU_PIN)); // ensure we are do enable pMOS to pull up the signal
-	gpio_set_output_options(GPIO_PORT(SIGNAL_PU_PIN), GPIO_OTYPE_OD, GPIO_OSPEED_2MHZ, GPIO_PIN(SIGNAL_PU_PIN)); // set output as open-drain
-	gpio_mode_setup(GPIO_PORT(SIGNAL_PU_PIN), GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO_PIN(SIGNAL_PU_PIN)); // configure pin as output
 	rcc_periph_clock_enable(GPIO_RCC(TARGET_EN)); // enable clock for port domain
 	gpio_set(GPIO_PORT(TARGET_EN), GPIO_PIN(TARGET_EN)); // ensure we do not enable pMOS to power level shifters
 	gpio_set_output_options(GPIO_PORT(TARGET_EN), GPIO_OTYPE_OD, GPIO_OSPEED_2MHZ, GPIO_PIN(TARGET_EN)); // set output as open-drain
 	gpio_mode_setup(GPIO_PORT(TARGET_EN), GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO_PIN(TARGET_EN)); // configure pin as output
 	puts("OK\n");
 
-	puts("setup analog multiplexer: ");
-	rcc_periph_clock_enable(GPIO_RCC(MUX_EN_PIN)); // enable clock for port domain
-	gpio_set(GPIO_PORT(MUX_EN_PIN), GPIO_PIN(MUX_EN_PIN)); // ensure multiplexer is disabled
-	gpio_set_output_options(GPIO_PORT(MUX_EN_PIN), GPIO_OTYPE_PP, GPIO_OSPEED_2MHZ, GPIO_PIN(MUX_EN_PIN)); // set output as push-pull to drive correctly
-	gpio_mode_setup(GPIO_PORT(MUX_EN_PIN), GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO_PIN(MUX_EN_PIN)); // configure pin as output
-	rcc_periph_clock_enable(GPIO_RCC(MUX_S0_PIN)); // enable clock for port domain
-	gpio_clear(GPIO_PORT(MUX_S0_PIN), GPIO_PIN(MUX_S0_PIN)); // any channel selected is fine
-	gpio_set_output_options(GPIO_PORT(MUX_S0_PIN), GPIO_OTYPE_PP, GPIO_OSPEED_2MHZ, GPIO_PIN(MUX_S0_PIN)); // set output as push-pull to drive correctly
-	gpio_mode_setup(GPIO_PORT(MUX_S0_PIN), GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO_PIN(MUX_S0_PIN)); // configure pin as output
-	rcc_periph_clock_enable(GPIO_RCC(MUX_S1_PIN)); // enable clock for port domain
-	gpio_clear(GPIO_PORT(MUX_S1_PIN), GPIO_PIN(MUX_S1_PIN)); // any channel selected is fine
-	gpio_set_output_options(GPIO_PORT(MUX_S1_PIN), GPIO_OTYPE_PP, GPIO_OSPEED_2MHZ, GPIO_PIN(MUX_S1_PIN)); // set output as push-pull to drive correctly
-	gpio_mode_setup(GPIO_PORT(MUX_S1_PIN), GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO_PIN(MUX_S1_PIN)); // configure pin as output
-	rcc_periph_clock_enable(GPIO_RCC(MUX_S2_PIN)); // enable clock for port domain
-	gpio_clear(GPIO_PORT(MUX_S2_PIN), GPIO_PIN(MUX_S2_PIN)); // any channel selected is fine
-	gpio_set_output_options(GPIO_PORT(MUX_S2_PIN), GPIO_OTYPE_PP, GPIO_OSPEED_2MHZ, GPIO_PIN(MUX_S2_PIN)); // set output as push-pull to drive correctly
-	gpio_mode_setup(GPIO_PORT(MUX_S2_PIN), GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO_PIN(MUX_S2_PIN)); // configure pin as output
-	rcc_periph_clock_enable(GPIO_RCC(MUX_S3_PIN)); // enable clock for port domain
-	gpio_clear(GPIO_PORT(MUX_S3_PIN), GPIO_PIN(MUX_S3_PIN)); // any channel selected is fine
-	gpio_set_output_options(GPIO_PORT(MUX_S3_PIN), GPIO_OTYPE_PP, GPIO_OSPEED_2MHZ, GPIO_PIN(MUX_S3_PIN)); // set output as push-pull to drive correctly
-	gpio_mode_setup(GPIO_PORT(MUX_S3_PIN), GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO_PIN(MUX_S3_PIN)); // configure pin as output
-	mux_select(-1); // ensure it is disabled
-	puts("OK\n");
-
 	puts("setup signal pins: ");
 	for (uint8_t i = 0; i < CHANNEL_NUMBERS; i++) {
 		rcc_periph_clock_enable(port2rcc(channel_ports[i])); // enable clock for port domain
@@ -1178,8 +991,6 @@ void main(void)
 	sleep_us(3); // wait t_stab for the ADC to stabilize
 	rcc_periph_clock_enable(RCC_ADC1_IN(TARGET_CHANNEL)); // enable clock for GPIO domain for target voltage channel
 	gpio_mode_setup(ADC1_IN_PORT(TARGET_CHANNEL), GPIO_MODE_ANALOG, GPIO_PUPD_NONE, ADC1_IN_PIN(TARGET_CHANNEL)); // set target voltage channel as analog input for the ADC
-	rcc_periph_clock_enable(RCC_ADC1_IN(SIGNAL_CHANNEL)); // enable clock for GPIO domain for signal channel
-	gpio_mode_setup(ADC1_IN_PORT(SIGNAL_CHANNEL), GPIO_MODE_ANALOG, GPIO_PUPD_NONE, ADC1_IN_PIN(SIGNAL_CHANNEL)); // set signal channel as analog input for the ADC
 	measure_voltages(); // try to measure voltages
 	puts("OK\n");