diff --git a/src/lpc176x/adc.c b/src/lpc176x/adc.c
index 4ea4e815..e89d73a4 100644
--- a/src/lpc176x/adc.c
+++ b/src/lpc176x/adc.c
@@ -36,6 +36,22 @@ static struct {
 
 enum { ADC_DONE=0x0100 };
 
+// ADC hardware irq handler
+void __visible
+ADC_IRQHandler(void)
+{
+    uint32_t pos = adc_status.pos, chan = adc_status.chan & 0xff;
+    uint32_t result = (&LPC_ADC->ADDR0)[chan];
+    if (pos >= ARRAY_SIZE(adc_status.samples))
+        // All samples complete
+        return;
+    if (pos >= ARRAY_SIZE(adc_status.samples) - 2)
+        // Turn off burst mode
+        LPC_ADC->ADCR = adc_status.adcr | (1 << chan);
+    adc_status.samples[pos++] = (result >> 4) & 0x0fff;
+    adc_status.pos = pos;
+}
+
 struct gpio_adc
 gpio_adc_setup(uint8_t pin)
 {
@@ -64,22 +80,6 @@ gpio_adc_setup(uint8_t pin)
     return (struct gpio_adc){ .chan = chan };
 }
 
-// ADC hardware irq handler
-void __visible
-ADC_IRQHandler(void)
-{
-    uint32_t pos = adc_status.pos, chan = adc_status.chan & 0xff;
-    uint32_t result = (&LPC_ADC->ADDR0)[chan];
-    if (pos >= ARRAY_SIZE(adc_status.samples))
-        // All samples complete
-        return;
-    if (pos >= ARRAY_SIZE(adc_status.samples) - 2)
-        // Turn off burst mode
-        LPC_ADC->ADCR = adc_status.adcr | (1 << chan);
-    adc_status.samples[pos++] = (result >> 4) & 0x0fff;
-    adc_status.pos = pos;
-}
-
 // Try to sample a value. Returns zero if sample ready, otherwise
 // returns the number of clock ticks the caller should wait before
 // retrying this function.
diff --git a/src/lpc176x/serial.c b/src/lpc176x/serial.c
index 63755467..f36a485c 100644
--- a/src/lpc176x/serial.c
+++ b/src/lpc176x/serial.c
@@ -12,35 +12,6 @@
 #include "internal.h" // gpio_peripheral
 #include "sched.h" // DECL_INIT
 
-DECL_CONSTANT_STR("RESERVE_PINS_serial", "P0.3,P0.2");
-
-void
-serial_init(void)
-{
-    // Setup baud
-    LPC_UART0->LCR = (1<<7); // set DLAB bit
-    enable_pclock(PCLK_UART0);
-    uint32_t pclk = SystemCoreClock;
-    uint32_t div = pclk / (CONFIG_SERIAL_BAUD * 16);
-    LPC_UART0->DLL = div & 0xff;
-    LPC_UART0->DLM = (div >> 8) & 0xff;
-    LPC_UART0->FDR = 0x10;
-    LPC_UART0->LCR = 3; // 8N1 ; clear DLAB bit
-
-    // Enable fifo
-    LPC_UART0->FCR = 0x01;
-
-    // Setup pins
-    gpio_peripheral(GPIO(0, 3), 1, 0);
-    gpio_peripheral(GPIO(0, 2), 1, 0);
-
-    // Enable receive irq
-    NVIC_SetPriority(UART0_IRQn, 0);
-    NVIC_EnableIRQ(UART0_IRQn);
-    LPC_UART0->IER = 0x01;
-}
-DECL_INIT(serial_init);
-
 // Write tx bytes to the serial port
 static void
 kick_tx(void)
@@ -81,3 +52,32 @@ serial_enable_tx_irq(void)
         irq_restore(flag);
     }
 }
+
+DECL_CONSTANT_STR("RESERVE_PINS_serial", "P0.3,P0.2");
+
+void
+serial_init(void)
+{
+    // Setup baud
+    LPC_UART0->LCR = (1<<7); // set DLAB bit
+    enable_pclock(PCLK_UART0);
+    uint32_t pclk = SystemCoreClock;
+    uint32_t div = pclk / (CONFIG_SERIAL_BAUD * 16);
+    LPC_UART0->DLL = div & 0xff;
+    LPC_UART0->DLM = (div >> 8) & 0xff;
+    LPC_UART0->FDR = 0x10;
+    LPC_UART0->LCR = 3; // 8N1 ; clear DLAB bit
+
+    // Enable fifo
+    LPC_UART0->FCR = 0x01;
+
+    // Setup pins
+    gpio_peripheral(GPIO(0, 3), 1, 0);
+    gpio_peripheral(GPIO(0, 2), 1, 0);
+
+    // Enable receive irq
+    NVIC_SetPriority(UART0_IRQn, 0);
+    NVIC_EnableIRQ(UART0_IRQn);
+    LPC_UART0->IER = 0x01;
+}
+DECL_INIT(serial_init);
diff --git a/src/lpc176x/usbserial.c b/src/lpc176x/usbserial.c
index b6779ed1..90e72cc4 100644
--- a/src/lpc176x/usbserial.c
+++ b/src/lpc176x/usbserial.c
@@ -260,6 +260,41 @@ usb_request_bootloader(void)
     NVIC_SystemReset();
 }
 
+
+/****************************************************************
+ * Setup and interrupts
+ ****************************************************************/
+
+void __visible
+USB_IRQHandler(void)
+{
+    uint32_t udis = LPC_USB->USBDevIntSt;
+    if (udis & DEV_STAT) {
+        LPC_USB->USBDevIntClr = DEV_STAT;
+        // XXX - should handle reset and other states
+    }
+    if (udis & EP_SLOW) {
+        uint32_t ueis = LPC_USB->USBEpIntSt;
+        if (ueis & (1<<EP0OUT)) {
+            sie_select_and_clear(EP0OUT);
+            usb_notify_ep0();
+        }
+        if (ueis & (1<<EP0IN)) {
+            sie_select_and_clear(EP0IN);
+            usb_notify_ep0();
+        }
+        if (ueis & (1<<EP2OUT)) {
+            sie_select_and_clear(EP2OUT);
+            usb_notify_bulk_out();
+        }
+        if (ueis & (1<<EP5IN)) {
+            sie_select_and_clear(EP5IN);
+            usb_notify_bulk_in();
+        }
+        LPC_USB->USBDevIntClr = EP_SLOW;
+    }
+}
+
 DECL_CONSTANT_STR("RESERVE_PINS_USB", "P0.30,P0.29,P2.9");
 
 void
@@ -295,33 +330,3 @@ usbserial_shutdown(void)
     usb_irq_enable();
 }
 DECL_SHUTDOWN(usbserial_shutdown);
-
-void __visible
-USB_IRQHandler(void)
-{
-    uint32_t udis = LPC_USB->USBDevIntSt;
-    if (udis & DEV_STAT) {
-        LPC_USB->USBDevIntClr = DEV_STAT;
-        // XXX - should handle reset and other states
-    }
-    if (udis & EP_SLOW) {
-        uint32_t ueis = LPC_USB->USBEpIntSt;
-        if (ueis & (1<<EP0OUT)) {
-            sie_select_and_clear(EP0OUT);
-            usb_notify_ep0();
-        }
-        if (ueis & (1<<EP0IN)) {
-            sie_select_and_clear(EP0IN);
-            usb_notify_ep0();
-        }
-        if (ueis & (1<<EP2OUT)) {
-            sie_select_and_clear(EP2OUT);
-            usb_notify_bulk_out();
-        }
-        if (ueis & (1<<EP5IN)) {
-            sie_select_and_clear(EP5IN);
-            usb_notify_bulk_in();
-        }
-        LPC_USB->USBDevIntClr = EP_SLOW;
-    }
-}