diff --git a/include/led7seg.h b/include/led7seg.h
index 39c4bb5..a1202d3 100644
--- a/include/led7seg.h
+++ b/include/led7seg.h
@@ -21,7 +21,7 @@ extern struct st_7seg st_7seg;
 void init_7seg(void);
 void step_7seg(void);
 int bt_inputs(void);
-void decimal_7seg(int module, int value, int dp);
+void decimal_7seg(int module, int value, uint8_t dp);
 void hex_7seg(int module, uint32_t value, uint8_t dp);
 void blank_7seg(int module);
 
diff --git a/include/proto.h b/include/proto.h
index b7abca9..6149861 100644
--- a/include/proto.h
+++ b/include/proto.h
@@ -52,14 +52,15 @@ enum proto_led_format {
     PROTO_LED_FMT_OFF = 0x00,
     PROTO_LED_FMT_DEC = 0x01,
     PROTO_LED_FMT_HEX = 0x02,
-    PROTO_LED_FMT_DP_0 = 0x00,
-    PROTO_LED_FMT_DP_1 = 0x20,
-    PROTO_LED_FMT_DP_2 = 0x40,
-    PROTO_LED_FMT_DP_3 = 0x60,
-    PROTO_LED_FMT_DP_4 = 0x80,
-    PROTO_LED_FMT_DP_5 = 0xa0,
-    PROTO_LED_FMT_DP_6 = 0xc0,
-    PROTO_LED_FMT_DP_7 = 0xe0,
+    PROTO_LED_FMT_DP_OFF = 0x00,
+    PROTO_LED_FMT_DP_0 = 0x10,
+    PROTO_LED_FMT_DP_1 = 0x30,
+    PROTO_LED_FMT_DP_2 = 0x50,
+    PROTO_LED_FMT_DP_3 = 0x70,
+    PROTO_LED_FMT_DP_4 = 0x90,
+    PROTO_LED_FMT_DP_5 = 0xb0,
+    PROTO_LED_FMT_DP_6 = 0xd0,
+    PROTO_LED_FMT_DP_7 = 0xf0,
 };
 
 struct __attribute__((__packed__)) pkt_update_display {
diff --git a/include/serial.h b/include/serial.h
index 072436d..b2c8771 100644
--- a/include/serial.h
+++ b/include/serial.h
@@ -19,7 +19,7 @@ struct dma_tx_buf {
     ssize_t packet_end[8];
 
     /* The following may be accessed by anything */
-    uint8_t data[512];
+    uint8_t data[256];
 };
 
 struct uart_dma_state {
@@ -36,7 +36,7 @@ struct uart_dma_state {
     DMA_Channel_TypeDef *tx_dma_ch;
     USART_TypeDef *usart;
 
-    uint8_t rx_buf[32];
+    uint8_t rx_buf[256];
     uint8_t addr;
 };
 
diff --git a/src/led7seg.c b/src/led7seg.c
index ac86c73..273431e 100644
--- a/src/led7seg.c
+++ b/src/led7seg.c
@@ -45,7 +45,7 @@ void init_7seg() {
     }
 }
 
-void decimal_7seg(int module, int value, int dp) {
+void decimal_7seg(int module, int value, uint8_t dp) {
     if (value < -9999999 || value > 99999999) {
         st_7seg.data[module][0] = 0xE;
         st_7seg.data[module][1] = 16; /* blank */
@@ -66,7 +66,7 @@ void decimal_7seg(int module, int value, int dp) {
         st_7seg.data[module][digit] = r;
     }
 
-    st_7seg.dp[module] = dp > 0 ? (1<<dp) : 0;
+    st_7seg.dp[module] = dp;
 }
 
 void hex_7seg(int module, uint32_t value, uint8_t dp) {
diff --git a/src/proto.c b/src/proto.c
index 9e84e2b..c7f638e 100644
--- a/src/proto.c
+++ b/src/proto.c
@@ -1,6 +1,7 @@
 
 #include <proto.h>
 #include <adc.h>
+#include <lcd.h>
 #include <led7seg.h>
 
 static void tx_time_sync(void);
@@ -9,6 +10,7 @@ static void proto_handle_host(bool timeout);
 static void proto_update_lcd_strings(void);
 static ErrorCode tx_update_display(void);
 static void tx_adc_data(void);
+static void update_displays(struct pkt_update_display *pk);
 static void tx_button_state(void);
 
 
@@ -57,6 +59,7 @@ void uart_handle_user_packet(struct ll_pkt *pkt, size_t len) {
         
     } else if (board_config == BCFG_DISPLAY) {
         if (pkt->type == PK_DISPLAY_UPDATE) {
+            update_displays((struct pkt_update_display *)pkt);
             tx_button_state();
         }
     } else if (board_config == BCFG_MEAS) {
@@ -110,6 +113,29 @@ void proto_handle_host(bool timeout) {
     }
 }
 
+void update_displays(struct pkt_update_display *pk) {
+    const char *buf[4] = {
+        &pk->lcd[0],
+        &pk->lcd[20],
+        &pk->lcd[40],
+        &pk->lcd[60],
+    };
+    lcd_write_dma(buf);
+
+    for (int module=0; module<3; module++) {
+        int fmt = pk->led_fmt[module];
+        uint8_t dp = (fmt & 0x10) ? (1<<(fmt>>5)) : 0;
+        
+        if ((fmt&3) == PROTO_LED_FMT_OFF) {
+            blank_7seg(module);
+        } else if ((fmt&3) == PROTO_LED_FMT_DEC) {
+            decimal_7seg(module, pk->led[module], dp);
+        } else if ((fmt&3) == PROTO_LED_FMT_HEX) {
+            hex_7seg(module, pk->led[module], dp);
+        }
+    }
+}
+
 void tx_adc_data() {
     struct pkt_adc_data pk = {
         .ll_pkt = {