diff --git a/src/clock.c b/src/clock.c
index 7cd5c8d..432c10d 100644
--- a/src/clock.c
+++ b/src/clock.c
@@ -52,6 +52,15 @@ void clock_init() {
   enablePLL0();
   setCCLKDiv(6);
   connectPLL0();
+
+
+/* configure PLL1 for USB operation */
+  disconnectPLL1();
+  disablePLL1();
+  LPC_SC->PLL1CFG = 0x23;
+  enablePLL1();
+  connectPLL1();
+
 }
 
 void setFlashAccessTime(uint8_t clocks) {
@@ -84,6 +93,32 @@ void disconnectPLL0() {
   PLL0feed();
 }
 
+void setPLL1MultPrediv(uint16_t mult, uint8_t prediv) {
+  LPC_SC->PLL1CFG=PLL_MULT(mult) | PLL_PREDIV(prediv);
+  PLL1feed();
+}
+
+void enablePLL1() {
+  LPC_SC->PLL1CON |= PLLE1;
+  PLL1feed();
+}
+
+void disablePLL1() {
+  LPC_SC->PLL1CON &= ~PLLE1;
+  PLL1feed();
+}
+
+void connectPLL1() {
+  while(!(LPC_SC->PLL1STAT & PLOCK1));
+  LPC_SC->PLL1CON |= PLLC1;
+  PLL1feed();
+}
+
+void disconnectPLL1() {
+  LPC_SC->PLL1CON &= ~PLLC1;
+  PLL1feed();
+}
+
 void setCCLKDiv(uint8_t div) {
   LPC_SC->CCLKCFG=CCLK_DIV(div);
 }
@@ -102,6 +137,11 @@ void PLL0feed() {
   LPC_SC->PLL0FEED=0x55;
 }
 
+void PLL1feed() {
+  LPC_SC->PLL1FEED=0xaa;
+  LPC_SC->PLL1FEED=0x55;
+}
+
 void setClkSrc(uint8_t src) {
   LPC_SC->CLKSRCSEL=src;
 }
diff --git a/src/clock.h b/src/clock.h
index 503d1d0..4530947 100644
--- a/src/clock.h
+++ b/src/clock.h
@@ -8,6 +8,9 @@
 #define PLLE0           (1<<0)
 #define PLLC0           (1<<1)
 #define PLOCK0          (1<<26)
+#define PLLE1           (1<<0)
+#define PLLC1           (1<<1)
+#define PLOCK1          (1<<10)
 #define OSCEN           (1<<5)
 #define OSCSTAT         (1<<6)
 #define FLASHTIM(x)     (((x-1)<<12)|0x3A)
@@ -56,14 +59,18 @@ void clock_init(void);
 void setFlashAccessTime(uint8_t clocks);
 
 void setPLL0MultPrediv(uint16_t mult, uint8_t prediv);
-
 void enablePLL0(void);
-
 void disablePLL0(void);
-
 void connectPLL0(void);
-
 void disconnectPLL0(void);
+void PLL0feed(void);
+
+void setPLL1MultPrediv(uint16_t mult, uint8_t prediv);
+void enablePLL1(void);
+void disablePLL1(void);
+void connectPLL1(void);
+void disconnectPLL1(void);
+void PLL1feed(void);
 
 void setCCLKDiv(uint8_t div);
 
@@ -71,7 +78,5 @@ void enableMainOsc(void);
 
 void disableMainOsc(void);
 
-void PLL0feed(void);
-
 void setClkSrc(uint8_t src);
 #endif
diff --git a/src/config.h b/src/config.h
index adb6b5d..a30c9d3 100644
--- a/src/config.h
+++ b/src/config.h
@@ -96,4 +96,7 @@
 
 #define SD_DAT (LPC_GPIO2->FIOPIN0)
 
+#define USB_CONNREG LPC_GPIO4
+#define USB_CONNBIT 28
+
 #endif
diff --git a/src/power.c b/src/power.c
index 848159c..f028f5e 100644
--- a/src/power.c
+++ b/src/power.c
@@ -21,6 +21,6 @@ void power_init() {
                 | BV(PCRTC)
                 | BV(PCGPIO)
                 | BV(PCPWM1)
-//                 | BV(PCUSB)
+                | BV(PCUSB)
   ;
 }