diff --git a/examples/stm32/f1/lisa-m-1/can/can.c b/examples/stm32/f1/lisa-m-1/can/can.c
index a4cf30dc..463d7fcd 100644
--- a/examples/stm32/f1/lisa-m-1/can/can.c
+++ b/examples/stm32/f1/lisa-m-1/can/can.c
@@ -135,7 +135,9 @@ void can_setup(void)
 		     CAN_BTR_SJW_1TQ,
 		     CAN_BTR_TS1_3TQ,
 		     CAN_BTR_TS2_4TQ,
-		     12))             /* BRP+1: Baud rate prescaler */
+		     12,		/* BRP+1: Baud rate prescaler */
+		     false,		/* loopback mode */
+		     false))		/* silent mode */
 	{
 		gpio_set(GPIOA, GPIO8);		/* LED0 off */
 		gpio_set(GPIOB, GPIO4);		/* LED1 off */
diff --git a/examples/stm32/f1/other/usb_dfu/usbdfu.c b/examples/stm32/f1/other/usb_dfu/usbdfu.c
index 268274e8..44dde169 100644
--- a/examples/stm32/f1/other/usb_dfu/usbdfu.c
+++ b/examples/stm32/f1/other/usb_dfu/usbdfu.c
@@ -249,6 +249,8 @@ int main(void)
 	AFIO_MAPR |= AFIO_MAPR_SWJ_CFG_JTAG_OFF_SW_ON;
 	gpio_set_mode(GPIOA, GPIO_MODE_INPUT, 0, GPIO15);
 
+	rcc_peripheral_enable_clock(&RCC_AHBENR, RCC_AHBENR_OTGFSEN);
+
 	usbd_dev = usbd_init(&stm32f107_usb_driver, &dev, &config, usb_strings);
 	usbd_set_control_buffer_size(usbd_dev, sizeof(usbd_control_buffer));
 	usbd_register_control_callback(
diff --git a/include/libopencm3/stm32/can.h b/include/libopencm3/stm32/can.h
index c5313949..65aca5ca 100644
--- a/include/libopencm3/stm32/can.h
+++ b/include/libopencm3/stm32/can.h
@@ -439,6 +439,7 @@ LGPL License Terms @ref lgpl_license
 #define CAN_BTR_SJW_3TQ			(0x2 << 24)
 #define CAN_BTR_SJW_4TQ			(0x3 << 24)
 #define CAN_BTR_SJW_MASK		(0x3 << 24)
+#define CAN_BTR_SJW_SHIFT		24
 
 /* 23 Reserved, forced by hardware to 0 */
 
@@ -452,6 +453,7 @@ LGPL License Terms @ref lgpl_license
 #define CAN_BTR_TS2_7TQ			(0x6 << 20)
 #define CAN_BTR_TS2_8TQ			(0x7 << 20)
 #define CAN_BTR_TS2_MASK		(0x7 << 20)
+#define CAN_BTR_TS2_SHIFT		20
 
 /* TS1[3:0]: Time segment 1 */
 #define CAN_BTR_TS1_1TQ			(0x0 << 16)
@@ -471,6 +473,7 @@ LGPL License Terms @ref lgpl_license
 #define CAN_BTR_TS1_15TQ		(0xE << 16)
 #define CAN_BTR_TS1_16TQ		(0xF << 16)
 #define CAN_BTR_TS1_MASK		(0xF << 16)
+#define CAN_BTR_TS1_SHIFT		16
 
 /* 15:10 Reserved, forced by hardware to 0 */
 
@@ -641,7 +644,8 @@ BEGIN_DECLS
 
 void can_reset(u32 canport);
 int can_init(u32 canport, bool ttcm, bool abom, bool awum, bool nart,
-	     bool rflm, bool txfp, u32 sjw, u32 ts1, u32 ts2, u32 brp);
+	     bool rflm, bool txfp, u32 sjw, u32 ts1, u32 ts2, u32 brp,
+	     bool loopback, bool silent);
 
 void can_filter_init(u32 canport, u32 nr, bool scale_32bit, bool id_list_mode,
 		     u32 fr1, u32 fr2, u32 fifo, bool enable);
@@ -662,7 +666,7 @@ void can_receive(u32 canport, u8 fifo, bool release, u32 *id, bool *ext,
 		 bool *rtr, u32 *fmi, u8 *length, u8 *data);
 
 void can_fifo_release(u32 canport, u8 fifo);
-
+bool can_available_mailbox(u32 canport);
 END_DECLS
 
 #endif
diff --git a/include/libopencm3/stm32/desig.h b/include/libopencm3/stm32/desig.h
index 74cfb353..6ceb6658 100644
--- a/include/libopencm3/stm32/desig.h
+++ b/include/libopencm3/stm32/desig.h
@@ -51,6 +51,15 @@ u16 desig_get_flash_size(void);
  */
 void desig_get_unique_id(u32 result[]);
 
+/**
+ * Read the full 96 bit unique identifier and return it as a
+ * zero-terminated string
+ * @param string memory region to write the result to
+ 8 @param string_len the size of string in bytes
+ */
+void desig_get_unique_id_as_string(char *string,
+				   unsigned int string_len);
+
 END_DECLS
 
 #endif
diff --git a/include/libopencm3/stm32/f1/dma.h b/include/libopencm3/stm32/f1/dma.h
index 6e5cc20f..6257394c 100644
--- a/include/libopencm3/stm32/f1/dma.h
+++ b/include/libopencm3/stm32/f1/dma.h
@@ -394,6 +394,7 @@ void dma_disable_channel(u32 dma, u8 channel);
 void dma_set_peripheral_address(u32 dma, u8 channel, u32 address);
 void dma_set_memory_address(u32 dma, u8 channel, u32 address);
 void dma_set_number_of_data(u32 dma, u8 channel, u16 number);
+void dma_clear_flag(u32 dma, u32 flag);
 
 END_DECLS
 
diff --git a/include/libopencm3/stm32/f1/rcc.h b/include/libopencm3/stm32/f1/rcc.h
index 855e43bb..868ad9ce 100644
--- a/include/libopencm3/stm32/f1/rcc.h
+++ b/include/libopencm3/stm32/f1/rcc.h
@@ -86,7 +86,7 @@ LGPL License Terms @ref lgpl_license
 #define RCC_CFGR_MCO_SYSCLK			0x4
 #define RCC_CFGR_MCO_HSICLK			0x5
 #define RCC_CFGR_MCO_HSECLK			0x6
-#define RCC_CFGR_RMCO_PLLCLK_DIV2		0x7
+#define RCC_CFGR_MCO_PLLCLK_DIV2		0x7
 #define RCC_CFGR_MCO_PLL2CLK			0x8 /* (**) */
 #define RCC_CFGR_MCO_PLL3CLK_DIV2		0x9 /* (**) */
 #define RCC_CFGR_MCO_XT1			0xa /* (**) */
@@ -448,6 +448,24 @@ LGPL License Terms @ref lgpl_license
 #define RCC_CFGR2_PLL2MUL_PLL2_CLK_MUL16	0xe
 #define RCC_CFGR2_PLL2MUL_PLL2_CLK_MUL20	0xf
 
+/* PREDIV: PREDIV division factor */
+#define RCC_CFGR2_PREDIV_NODIV			0x0
+#define RCC_CFGR2_PREDIV_DIV2			0x1
+#define RCC_CFGR2_PREDIV_DIV3			0x2
+#define RCC_CFGR2_PREDIV_DIV4			0x3
+#define RCC_CFGR2_PREDIV_DIV5			0x4
+#define RCC_CFGR2_PREDIV_DIV6			0x5
+#define RCC_CFGR2_PREDIV_DIV7			0x6
+#define RCC_CFGR2_PREDIV_DIV8			0x7
+#define RCC_CFGR2_PREDIV_DIV9			0x8
+#define RCC_CFGR2_PREDIV_DIV10			0x9
+#define RCC_CFGR2_PREDIV_DIV11			0xa
+#define RCC_CFGR2_PREDIV_DIV12			0xb
+#define RCC_CFGR2_PREDIV_DIV13			0xc
+#define RCC_CFGR2_PREDIV_DIV14			0xd
+#define RCC_CFGR2_PREDIV_DIV15			0xe
+#define RCC_CFGR2_PREDIV_DIV16			0xf
+
 /* PREDIV2: PREDIV2 division factor */
 #define RCC_CFGR2_PREDIV2_NODIV			0x0
 #define RCC_CFGR2_PREDIV2_DIV2			0x1
@@ -473,7 +491,7 @@ extern u32 rcc_ppre2_frequency;
 /* --- Function prototypes ------------------------------------------------- */
 
 typedef enum {
-	PLL, HSE, HSI, LSE, LSI
+	PLL, PLL2, PLL3, HSE, HSI, LSE, LSI
 } osc_t;
 
 BEGIN_DECLS
@@ -489,6 +507,7 @@ void rcc_osc_on(osc_t osc);
 void rcc_osc_off(osc_t osc);
 void rcc_css_enable(void);
 void rcc_css_disable(void);
+void rcc_set_mco(u32 mcosrc);
 void rcc_osc_bypass_enable(osc_t osc);
 void rcc_osc_bypass_disable(osc_t osc);
 void rcc_peripheral_enable_clock(volatile u32 *reg, u32 en);
@@ -497,6 +516,7 @@ void rcc_peripheral_reset(volatile u32 *reg, u32 reset);
 void rcc_peripheral_clear_reset(volatile u32 *reg, u32 clear_reset);
 void rcc_set_sysclk_source(u32 clk);
 void rcc_set_pll_multiplication_factor(u32 mul);
+void rcc_set_pll2_multiplication_factor(u32 mul);
 void rcc_set_pll_source(u32 pllsrc);
 void rcc_set_pllxtpre(u32 pllxtpre);
 void rcc_set_adcpre(u32 adcpre);
@@ -512,6 +532,7 @@ void rcc_clock_setup_in_hse_8mhz_out_24mhz(void);
 void rcc_clock_setup_in_hse_8mhz_out_72mhz(void);
 void rcc_clock_setup_in_hse_12mhz_out_72mhz(void);
 void rcc_clock_setup_in_hse_16mhz_out_72mhz(void);
+void rcc_clock_setup_in_hse_25mhz_out_72mhz(void);
 void rcc_backupdomain_reset(void);
 
 END_DECLS
diff --git a/include/libopencm3/stm32/i2c.h b/include/libopencm3/stm32/i2c.h
index a59c4202..1b2dc0ee 100644
--- a/include/libopencm3/stm32/i2c.h
+++ b/include/libopencm3/stm32/i2c.h
@@ -321,7 +321,14 @@ LGPL License Terms @ref lgpl_license
 #define I2C_CCR_FS			(1 << 15)
 
 /* DUTY: Fast Mode Duty Cycle */
+/** @defgroup i2c_duty_cycle I2C peripheral clock duty cycles
+@ingroup i2c_defines
+
+@{*/
 #define I2C_CCR_DUTY			(1 << 14)
+#define I2C_CCR_DUTY_DIV2		0
+#define I2C_CCR_DUTY_16_DIV_9		1
+/**@}*/
 
 /* Note: Bits [13:12] are reserved, and forced to 0 by hardware. */
 
@@ -359,6 +366,7 @@ void i2c_peripheral_enable(u32 i2c);
 void i2c_peripheral_disable(u32 i2c);
 void i2c_send_start(u32 i2c);
 void i2c_send_stop(u32 i2c);
+void i2c_clear_stop(u32 i2c);
 void i2c_set_own_7bit_slave_address(u32 i2c, u8 slave);
 void i2c_set_own_10bit_slave_address(u32 i2c, u16 slave);
 void i2c_set_fast_mode(u32 i2c);
@@ -368,6 +376,18 @@ void i2c_set_ccr(u32 i2c, u16 freq);
 void i2c_set_trise(u32 i2c, u16 trise);
 void i2c_send_7bit_address(u32 i2c, u8 slave, u8 readwrite);
 void i2c_send_data(u32 i2c, u8 data);
+uint8_t i2c_get_data(u32 i2c);
+void i2c_enable_interrupt(u32 i2c, u32 interrupt);
+void i2c_disable_interrupt(u32 i2c, u32 interrupt);
+void i2c_enable_ack(u32 i2c);
+void i2c_disable_ack(u32 i2c);
+void i2c_nack_next(u32 i2c);
+void i2c_nack_current(u32 i2c);
+void i2c_set_dutycycle(u32 i2c, u32 dutycycle);
+void i2c_enable_dma(u32 i2c);
+void i2c_disable_dma(u32 i2c);
+void i2c_set_dma_last_transfer(u32 i2c);
+void i2c_clear_dma_last_transfer(u32 i2c);
 
 END_DECLS
 
diff --git a/include/libopencm3/usb/usbd.h b/include/libopencm3/usb/usbd.h
index 98bf6ebb..2e5b7fbb 100644
--- a/include/libopencm3/usb/usbd.h
+++ b/include/libopencm3/usb/usbd.h
@@ -24,6 +24,13 @@
 
 BEGIN_DECLS
 
+
+enum usbd_request_return_codes {
+	USBD_REQ_NOTSUPP	= 0,
+	USBD_REQ_HANDLED	= 1,
+	USBD_REQ_NEXT_CALLBACK	= 2,
+};
+
 typedef struct _usbd_driver usbd_driver;
 typedef struct _usbd_device usbd_device;
 
@@ -40,9 +47,10 @@ extern u8 usbd_control_buffer[];
 
 /* <usb.c> */
 extern usbd_device *usbd_init(const usbd_driver *driver,
-		     const struct usb_device_descriptor *dev,
-                     const struct usb_config_descriptor *conf,
-		     const char **strings);
+			      const struct usb_device_descriptor *dev,
+			      const struct usb_config_descriptor *conf,
+			      const char **strings, int num_strings);
+
 extern void usbd_set_control_buffer_size(usbd_device *usbd_dev, u16 size);
 
 extern void usbd_register_reset_callback(usbd_device *usbd_dev,
diff --git a/include/libopencm3/usb/usbstd.h b/include/libopencm3/usb/usbstd.h
index 5b1cea4d..79082806 100644
--- a/include/libopencm3/usb/usbstd.h
+++ b/include/libopencm3/usb/usbstd.h
@@ -223,4 +223,7 @@ struct usb_iface_assoc_descriptor {
 #define USB_DT_INTERFACE_ASSOCIATION_SIZE \
 				sizeof(struct usb_iface_assoc_descriptor)
 
+enum usb_language_id {
+	USB_LANGID_ENGLISH_US = 0x409,
+};
 #endif
diff --git a/lib/stm32/can.c b/lib/stm32/can.c
index 9b2f22af..7fde5852 100644
--- a/lib/stm32/can.c
+++ b/lib/stm32/can.c
@@ -85,7 +85,8 @@ Initialize the selected CAN peripheral block.
 @returns int 0 on success, 1 on initialization failure.
 */
 int can_init(u32 canport, bool ttcm, bool abom, bool awum, bool nart,
-	     bool rflm, bool txfp, u32 sjw, u32 ts1, u32 ts2, u32 brp)
+	     bool rflm, bool txfp, u32 sjw, u32 ts1, u32 ts2, u32 brp,
+	     bool loopback, bool silent)
 {
 	u32 wait_ack = 0x00000000;
 	u32 can_msr_inak_timeout = 0x0000FFFF;
@@ -107,6 +108,9 @@ int can_init(u32 canport, bool ttcm, bool abom, bool awum, bool nart,
 	if ((CAN_MSR(canport) & CAN_MSR_INAK) != CAN_MSR_INAK)
 		return 1;
 
+	/* clear can timing bits */
+	CAN_BTR(canport) = 0;
+
 	/* Set the automatic bus-off management. */
 	if (ttcm)
 		CAN_MCR(canport) |= CAN_MCR_TTCM;
@@ -138,8 +142,19 @@ int can_init(u32 canport, bool ttcm, bool abom, bool awum, bool nart,
 	else
 		CAN_MCR(canport) &= ~CAN_MCR_TXFP;
 
+	if (silent)
+		CAN_BTR(canport) |= CAN_BTR_SILM;
+	else
+		CAN_BTR(canport) &= ~CAN_BTR_SILM;
+
+	if (loopback)
+		CAN_BTR(canport) |= CAN_BTR_LBKM;
+	else
+		CAN_BTR(canport) &= ~CAN_BTR_LBKM;
+
+
 	/* Set bit timings. */
-	CAN_BTR(canport) = sjw | ts2 | ts1 |
+	CAN_BTR(canport) |= sjw | ts2 | ts1 |
 		           (u32)(CAN_BTR_BRP_MASK & (brp - 1));
 
 	/* Request initialization "leave". */
@@ -456,3 +471,8 @@ void can_receive(u32 canport, u8 fifo, bool release, u32 *id, bool *ext,
 	if (release)
 		can_fifo_release(canport, fifo);
 }
+
+bool can_available_mailbox(u32 canport)
+{
+	return CAN_TSR(canport) & (CAN_TSR_TME0 | CAN_TSR_TME1 | CAN_TSR_TME2);
+}
diff --git a/lib/stm32/desig.c b/lib/stm32/desig.c
index 0743dc87..ea861aaa 100644
--- a/lib/stm32/desig.c
+++ b/lib/stm32/desig.c
@@ -35,3 +35,25 @@ void desig_get_unique_id(u32 result[])
     result[1] = bits63_32;
     result[2] = bits31_16 << 16 | bits15_0;
 }
+
+void desig_get_unique_id_as_string(char *string,
+				   unsigned int string_len)
+{
+	int i, len;
+	u8 device_id[12];
+	static const char chars[] = "0123456789ABCDEF";
+
+	desig_get_unique_id((u32 *)device_id);
+
+	/* Each byte produces two characters */
+	len = (2 * sizeof(device_id) < string_len) ?
+		2 * sizeof(device_id) : string_len - 1;
+
+	for (i = 0; i < len; i += 2) {
+		string[i]     = chars[(device_id[i / 2] >> 0) & 0x0F];
+		string[i + 1] = chars[(device_id[i / 2] >> 4) & 0x0F];
+	}
+
+	string[len] = '\0';
+}
+
diff --git a/lib/stm32/f1/dma.c b/lib/stm32/f1/dma.c
index fa7fb720..1f06c114 100644
--- a/lib/stm32/f1/dma.c
+++ b/lib/stm32/f1/dma.c
@@ -433,5 +433,10 @@ void dma_set_number_of_data(u32 dma, u8 channel, u16 number)
 {
 	DMA_CNDTR(dma, channel) = number;
 }
+
+void dma_clear_flag(u32 dma, u32 flag)
+{
+	DMA_ISR(dma) &= ~flag;
+}
 /**@}*/
 
diff --git a/lib/stm32/f1/gpio.c b/lib/stm32/f1/gpio.c
index f0b7f700..2b33cad9 100644
--- a/lib/stm32/f1/gpio.c
+++ b/lib/stm32/f1/gpio.c
@@ -164,7 +164,7 @@ value cannot be ascertained from the hardware.
 */
 void gpio_primary_remap(u8 swjdisable, u32 maps)
 {
-	AFIO_MAPR = swjdisable | (maps & 0x1FFFFF);
+	AFIO_MAPR |= swjdisable | (maps & 0x1FFFFF);
 }
 
 /*-----------------------------------------------------------------------------*/
@@ -182,7 +182,7 @@ The AFIO remapping feature is used only with the STM32F10x series.
 */
 void gpio_secondary_remap(u32 maps)
 {
-	AFIO_MAPR2 = maps;
+	AFIO_MAPR2 |= maps;
 }
 
 /**@}*/
diff --git a/lib/stm32/f1/rcc.c b/lib/stm32/f1/rcc.c
index ab3350b2..9cd86588 100644
--- a/lib/stm32/f1/rcc.c
+++ b/lib/stm32/f1/rcc.c
@@ -71,6 +71,12 @@ void rcc_osc_ready_int_clear(osc_t osc)
 	case PLL:
 		RCC_CIR |= RCC_CIR_PLLRDYC;
 		break;
+	case PLL2:
+		RCC_CIR |= RCC_CIR_PLL2RDYC;
+		break;
+	case PLL3:
+		RCC_CIR |= RCC_CIR_PLL3RDYC;
+		break;
 	case HSE:
 		RCC_CIR |= RCC_CIR_HSERDYC;
 		break;
@@ -98,6 +104,12 @@ void rcc_osc_ready_int_enable(osc_t osc)
 	case PLL:
 		RCC_CIR |= RCC_CIR_PLLRDYIE;
 		break;
+	case PLL2:
+		RCC_CIR |= RCC_CIR_PLL2RDYIE;
+		break;
+	case PLL3:
+		RCC_CIR |= RCC_CIR_PLL3RDYIE;
+		break;
 	case HSE:
 		RCC_CIR |= RCC_CIR_HSERDYIE;
 		break;
@@ -125,6 +137,12 @@ void rcc_osc_ready_int_disable(osc_t osc)
 	case PLL:
 		RCC_CIR &= ~RCC_CIR_PLLRDYIE;
 		break;
+	case PLL2:
+		RCC_CIR &= ~RCC_CIR_PLL2RDYIE;
+		break;
+	case PLL3:
+		RCC_CIR &= ~RCC_CIR_PLL3RDYIE;
+		break;
 	case HSE:
 		RCC_CIR &= ~RCC_CIR_HSERDYIE;
 		break;
@@ -153,6 +171,12 @@ int rcc_osc_ready_int_flag(osc_t osc)
 	case PLL:
 		return ((RCC_CIR & RCC_CIR_PLLRDYF) != 0);
 		break;
+	case PLL2:
+		return ((RCC_CIR & RCC_CIR_PLL2RDYF) != 0);
+		break;
+	case PLL3:
+		return ((RCC_CIR & RCC_CIR_PLL3RDYF) != 0);
+		break;
 	case HSE:
 		return ((RCC_CIR & RCC_CIR_HSERDYF) != 0);
 		break;
@@ -203,6 +227,12 @@ void rcc_wait_for_osc_ready(osc_t osc)
 	case PLL:
 		while ((RCC_CR & RCC_CR_PLLRDY) == 0);
 		break;
+	case PLL2:
+		while ((RCC_CR & RCC_CR_PLL2RDY) == 0);
+		break;
+	case PLL3:
+		while ((RCC_CR & RCC_CR_PLL3RDY) == 0);
+		break;
 	case HSE:
 		while ((RCC_CR & RCC_CR_HSERDY) == 0);
 		break;
@@ -238,6 +268,12 @@ void rcc_osc_on(osc_t osc)
 	case PLL:
 		RCC_CR |= RCC_CR_PLLON;
 		break;
+	case PLL2:
+		RCC_CR |= RCC_CR_PLL2ON;
+		break;
+	case PLL3:
+		RCC_CR |= RCC_CR_PLL3ON;
+		break;
 	case HSE:
 		RCC_CR |= RCC_CR_HSEON;
 		break;
@@ -273,6 +309,12 @@ void rcc_osc_off(osc_t osc)
 	case PLL:
 		RCC_CR &= ~RCC_CR_PLLON;
 		break;
+	case PLL2:
+		RCC_CR &= ~RCC_CR_PLL2ON;
+		break;
+	case PLL3:
+		RCC_CR &= ~RCC_CR_PLL3ON;
+		break;
 	case HSE:
 		RCC_CR &= ~RCC_CR_HSEON;
 		break;
@@ -331,6 +373,8 @@ void rcc_osc_bypass_enable(osc_t osc)
 		RCC_BDCR |= RCC_BDCR_LSEBYP;
 		break;
 	case PLL:
+	case PLL2:
+	case PLL3:
 	case HSI:
 	case LSI:
 		/* Do nothing, only HSE/LSE allowed here. */
@@ -361,6 +405,8 @@ void rcc_osc_bypass_disable(osc_t osc)
 		RCC_BDCR &= ~RCC_BDCR_LSEBYP;
 		break;
 	case PLL:
+	case PLL2:
+	case PLL3:
 	case HSI:
 	case LSI:
 		/* Do nothing, only HSE/LSE allowed here. */
@@ -484,6 +530,40 @@ void rcc_set_pll_multiplication_factor(u32 mul)
 	RCC_CFGR = (reg32 | (mul << 18));
 }
 
+/*-----------------------------------------------------------------------------*/
+/** @brief RCC Set the PLL2 Multiplication Factor.
+
+@note This only has effect when the PLL is disabled.
+
+@param[in] mul Unsigned int32. PLL multiplication factor @ref rcc_cfgr_pmf
+*/
+
+void rcc_set_pll2_multiplication_factor(u32 mul)
+{
+	u32 reg32;
+
+	reg32 = RCC_CFGR2;
+	reg32 &= ~((1 << 11) | (1 << 10) | (1 << 9) | (1 << 8));
+	RCC_CFGR2 = (reg32 | (mul << 8));
+}
+
+/*-----------------------------------------------------------------------------*/
+/** @brief RCC Set the PLL3 Multiplication Factor.
+
+@note This only has effect when the PLL is disabled.
+
+@param[in] mul Unsigned int32. PLL multiplication factor @ref rcc_cfgr_pmf
+*/
+
+void rcc_set_pll3_multiplication_factor(u32 mul)
+{
+	u32 reg32;
+
+	reg32 = RCC_CFGR2;
+	reg32 &= ~((1 << 15) | (1 << 14) | (1 << 13) | (1 << 12));
+	RCC_CFGR2 = (reg32 | (mul << 12));
+}
+
 /*-----------------------------------------------------------------------------*/
 /** @brief RCC Set the PLL Clock Source.
 
@@ -602,6 +682,36 @@ void rcc_set_usbpre(u32 usbpre)
 	RCC_CFGR = (reg32 | (usbpre << 22));
 }
 
+void rcc_set_prediv1(u32 prediv)
+{
+	u32 reg32;
+	reg32 = RCC_CFGR2;
+	reg32 &= ~(1 << 3) | (1 << 2) | (1 << 1) | (1 << 0);
+	RCC_CFGR2 |= (reg32 | prediv);
+}
+
+void rcc_set_prediv2(u32 prediv)
+{
+	u32 reg32;
+	reg32 = RCC_CFGR2;
+	reg32 &= ~(1 << 7) | (1 << 6) | (1 << 5) | (1 << 4);
+	RCC_CFGR2 |= (reg32 | (prediv << 4));
+}
+
+void rcc_set_prediv1_source(u32 rccsrc)
+{
+	RCC_CFGR2 &= ~(1 << 16);
+	RCC_CFGR2 |= (rccsrc << 16);
+}
+
+void rcc_set_mco(u32 mcosrc)
+{
+	u32 reg32;
+	reg32 = RCC_CFGR;
+	reg32 &= ~((1 << 27) | (1 << 26) | (1 << 25) | (1 << 24));
+	RCC_CFGR |= (reg32 | (mcosrc << 24));
+}
+
 /*-----------------------------------------------------------------------------*/
 /** @brief RCC Get the System Clock Source.
 
@@ -1030,6 +1140,63 @@ void rcc_clock_setup_in_hse_16mhz_out_72mhz(void)
 	rcc_ppre2_frequency = 72000000;
 }
 
+/*-----------------------------------------------------------------------------*/
+/** @brief RCC Set System Clock PLL at 72MHz from HSE at 25MHz
+
+*/
+
+void rcc_clock_setup_in_hse_25mhz_out_72mhz(void)
+{
+	/* Enable external high-speed oscillator 25MHz. */
+	rcc_osc_on(HSE);
+	rcc_wait_for_osc_ready(HSE);
+	rcc_set_sysclk_source(RCC_CFGR_SW_SYSCLKSEL_HSECLK);
+
+	/*
+	 * Sysclk runs with 72MHz -> 2 waitstates.
+	 * 0WS from 0-24MHz
+	 * 1WS from 24-48MHz
+	 * 2WS from 48-72MHz
+	 */
+	flash_set_ws(FLASH_LATENCY_2WS);
+
+	/*
+	 * Set prescalers for AHB, ADC, ABP1, ABP2.
+	 * Do this before touching the PLL (TODO: why?).
+	 */
+	rcc_set_hpre(RCC_CFGR_HPRE_SYSCLK_NODIV);	/* Set. 72MHz Max. 72MHz */
+	rcc_set_adcpre(RCC_CFGR_ADCPRE_PCLK2_DIV6);	/* Set. 12MHz Max. 14MHz */
+	rcc_set_ppre1(RCC_CFGR_PPRE1_HCLK_DIV2);	/* Set. 36MHz Max. 36MHz */
+	rcc_set_ppre2(RCC_CFGR_PPRE2_HCLK_NODIV);	/* Set. 72MHz Max. 72MHz */
+
+	/* Set pll2 prediv and multiplier */
+	rcc_set_prediv2(RCC_CFGR2_PREDIV2_DIV5);
+	rcc_set_pll2_multiplication_factor(RCC_CFGR2_PLL2MUL_PLL2_CLK_MUL8);
+
+	/* Enable PLL2 oscillator and wait for it to stabilize */
+	rcc_osc_on(PLL2);
+	rcc_wait_for_osc_ready(PLL2);
+
+	/* Set pll1 prediv/multiplier, prediv1 src, and usb predivider */
+	rcc_set_pllxtpre(RCC_CFGR_PLLXTPRE_HSE_CLK);
+	rcc_set_prediv1_source(RCC_CFGR2_PREDIV1SRC_PLL2_CLK);
+	rcc_set_prediv1(RCC_CFGR2_PREDIV_DIV5);
+	rcc_set_pll_multiplication_factor(RCC_CFGR_PLLMUL_PLL_CLK_MUL9);
+	rcc_set_pll_source(RCC_CFGR_PLLSRC_PREDIV1_CLK);
+	rcc_set_usbpre(RCC_CFGR_USBPRE_PLL_VCO_CLK_DIV3);
+
+	/* enable PLL1 and wait for it to stabilize */
+	rcc_osc_on(PLL);
+	rcc_wait_for_osc_ready(PLL);
+
+	/* Select PLL as SYSCLK source. */
+	rcc_set_sysclk_source(RCC_CFGR_SW_SYSCLKSEL_PLLCLK);
+
+	/* Set the peripheral clock frequencies used */
+	rcc_ppre1_frequency = 36000000;
+	rcc_ppre2_frequency = 72000000;
+}
+
 /*-----------------------------------------------------------------------------*/
 /** @brief RCC Reset the backup domain
 
diff --git a/lib/stm32/f1/rtc.c b/lib/stm32/f1/rtc.c
index 08a49536..cfc5f5b6 100644
--- a/lib/stm32/f1/rtc.c
+++ b/lib/stm32/f1/rtc.c
@@ -67,6 +67,8 @@ void rtc_awake_from_off(osc_t clock_source)
 		RCC_BDCR |= (1 << 9) | (1 << 8);
 		break;
 	case PLL:
+	case PLL2:
+	case PLL3:
 	case HSI:
 		/* Unusable clock source, here to prevent warnings. */
 		/* Turn off clock sources to RTC. */
diff --git a/lib/stm32/i2c.c b/lib/stm32/i2c.c
index e1d3a095..a67beced 100644
--- a/lib/stm32/i2c.c
+++ b/lib/stm32/i2c.c
@@ -124,6 +124,18 @@ void i2c_send_stop(u32 i2c)
 	I2C_CR1(i2c) |= I2C_CR1_STOP;
 }
 
+/*-----------------------------------------------------------------------------*/
+/** @brief I2C Clear Stop Flag.
+
+Clear the "Send Stop" flag in the I2C config register
+
+@param[in] i2c Unsigned int32. I2C register base address @ref i2c_reg_base.
+*/
+void i2c_clear_stop(u32 i2c)
+{
+	I2C_CR1(i2c) &= ~I2C_CR1_STOP;
+}
+
 /*-----------------------------------------------------------------------------*/
 /** @brief I2C Set the 7 bit Slave Address for the Peripheral.
 
@@ -269,5 +281,135 @@ void i2c_send_data(u32 i2c, u8 data)
 	I2C_DR(i2c) = data;
 }
 
-/**@}*/
+/*-----------------------------------------------------------------------------*/
+/** @brief I2C Get Data.
 
+@param[in] i2c Unsigned int32. I2C register base address @ref i2c_reg_base.
+*/
+uint8_t i2c_get_data(u32 i2c)
+{
+	return I2C_DR(i2c) & 0xff;
+}
+
+/*-----------------------------------------------------------------------------*/
+/** @brief I2C Enable Interrupt
+
+@param[in] i2c Unsigned int32. I2C register base address @ref i2c_reg_base.
+@param[in] interrupt Unsigned int32. Interrupt to enable.
+*/
+void i2c_enable_interrupt(u32 i2c, u32 interrupt)
+{
+	I2C_CR2(i2c) |= interrupt;
+}
+
+/*-----------------------------------------------------------------------------*/
+/** @brief I2C Disable Interrupt
+
+@param[in] i2c Unsigned int32. I2C register base address @ref i2c_reg_base.
+@param[in] interrupt Unsigned int32. Interrupt to disable.
+*/
+void i2c_disable_interrupt(u32 i2c, u32 interrupt)
+{
+	I2C_CR2(i2c) &= ~interrupt;
+}
+
+/*-----------------------------------------------------------------------------*/
+/** @brief I2C Enable ACK
+
+Enables acking of own 7/10 bit address
+@param[in] i2c Unsigned int32. I2C register base address @ref i2c_reg_base.
+*/
+void i2c_enable_ack(u32 i2c)
+{
+	I2C_CR1(i2c) |= I2C_CR1_ACK;
+}
+
+/*-----------------------------------------------------------------------------*/
+/** @brief I2C Disable ACK
+
+Disables acking of own 7/10 bit address
+@param[in] i2c Unsigned int32. I2C register base address @ref i2c_reg_base.
+*/
+void i2c_disable_ack(u32 i2c)
+{
+	I2C_CR1(i2c) &= ~I2C_CR1_ACK;
+}
+
+/*-----------------------------------------------------------------------------*/
+/** @brief I2C NACK Next Byte
+
+Causes the I2C controller to NACK the reception of the next byte
+@param[in] i2c Unsigned int32. I2C register base address @ref i2c_reg_base.
+*/
+void i2c_nack_next(u32 i2c)
+{
+	I2C_CR1(i2c) |= I2C_CR1_POS;
+}
+
+/*-----------------------------------------------------------------------------*/
+/** @brief I2C NACK Next Byte
+
+Causes the I2C controller to NACK the reception of the current byte
+
+@param[in] i2c Unsigned int32. I2C register base address @ref i2c_reg_base.
+*/
+void i2c_nack_current(u32 i2c)
+{
+	I2C_CR1(i2c) &= ~I2C_CR1_POS;
+}
+
+/*-----------------------------------------------------------------------------*/
+/** @brief I2C Set clock duty cycle
+
+@param[in] i2c Unsigned int32. I2C register base address @ref i2c_reg_base.
+@param[in] dutycycle Unsigned int32. I2C duty cycle @ref i2c_duty_cycle.
+*/
+void i2c_set_dutycycle(u32 i2c, u32 dutycycle)
+{
+	if (dutycycle == I2C_CCR_DUTY_DIV2)
+		I2C_CCR(i2c) &= ~I2C_CCR_DUTY;
+	else
+		I2C_CCR(i2c) |= I2C_CCR_DUTY;
+}
+
+/*-----------------------------------------------------------------------------*/
+/** @brief I2C Enable DMA
+
+@param[in] i2c Unsigned int32. I2C register base address @ref i2c_reg_base.
+*/
+void i2c_enable_dma(u32 i2c)
+{
+	I2C_CR2(i2c) |= I2C_CR2_DMAEN;
+}
+
+/*-----------------------------------------------------------------------------*/
+/** @brief I2C Disable DMA
+
+@param[in] i2c Unsigned int32. I2C register base address @ref i2c_reg_base.
+*/
+void i2c_disable_dma(u32 i2c)
+{
+	I2C_CR2(i2c) &= ~I2C_CR2_DMAEN;
+}
+
+/*-----------------------------------------------------------------------------*/
+/** @brief I2C Set DMA last transfer
+
+@param[in] i2c Unsigned int32. I2C register base address @ref i2c_reg_base.
+*/
+void i2c_set_dma_last_transfer(u32 i2c)
+{
+	I2C_CR2(i2c) |= I2C_CR2_LAST;
+}
+
+/*-----------------------------------------------------------------------------*/
+/** @brief I2C Clear DMA last transfer
+
+@param[in] i2c Unsigned int32. I2C register base address @ref i2c_reg_base.
+*/
+void i2c_clear_dma_last_transfer(u32 i2c)
+{
+	I2C_CR2(i2c) &= ~I2C_CR2_LAST;
+}
+
+/**@}*/
diff --git a/lib/usb/usb.c b/lib/usb/usb.c
index ecebde2d..0799202a 100644
--- a/lib/usb/usb.c
+++ b/lib/usb/usb.c
@@ -44,7 +44,7 @@ u8 usbd_control_buffer[128] __attribute__((weak));
 usbd_device *usbd_init(const usbd_driver *driver,
 	      	       const struct usb_device_descriptor *dev,
 	      	       const struct usb_config_descriptor *conf,
-		       const char **strings)
+		       const char **strings, int num_strings)
 {
 	usbd_device *usbd_dev;
 
@@ -54,6 +54,7 @@ usbd_device *usbd_init(const usbd_driver *driver,
 	usbd_dev->desc = dev;
 	usbd_dev->config = conf;
 	usbd_dev->strings = strings;
+	usbd_dev->num_strings = num_strings;
 	usbd_dev->ctrl_buf = usbd_control_buffer;
 	usbd_dev->ctrl_buf_len = sizeof(usbd_control_buffer);
 
diff --git a/lib/usb/usb_control.c b/lib/usb/usb_control.c
index 245ab1ce..82843dfb 100644
--- a/lib/usb/usb_control.c
+++ b/lib/usb/usb_control.c
@@ -99,11 +99,12 @@ static int usb_control_request_dispatch(usbd_device *usbd_dev,
 					  &(usbd_dev->control_state.ctrl_buf),
 					  &(usbd_dev->control_state.ctrl_len),
 					  &(usbd_dev->control_state.complete));
-			if (result)
+			if (result == USBD_REQ_HANDLED ||
+			    result == USBD_REQ_NOTSUPP)
 				return result;
 		}
 	}
-
+	
 	/* Try standard request if not already handled. */
 	return _usbd_standard_request(usbd_dev, req,
 				      &(usbd_dev->control_state.ctrl_buf),
diff --git a/lib/usb/usb_private.h b/lib/usb/usb_private.h
index 2506ba53..454e8c6b 100644
--- a/lib/usb/usb_private.h
+++ b/lib/usb/usb_private.h
@@ -29,6 +29,7 @@ struct _usbd_device {
 	const struct usb_device_descriptor *desc;
 	const struct usb_config_descriptor *config;
 	const char **strings;
+	int num_strings;
 
 	u8 *ctrl_buf;  /**< Internal buffer used for control transfers */
 	u16 ctrl_buf_len;
diff --git a/lib/usb/usb_standard.c b/lib/usb/usb_standard.c
index 5a92cd85..e14fee35 100644
--- a/lib/usb/usb_standard.c
+++ b/lib/usb/usb_standard.c
@@ -90,52 +90,75 @@ static u16 build_config_descriptor(usbd_device *usbd_dev,
 	return total;
 }
 
+static int usb_descriptor_type(u16 wValue)
+{
+	return wValue >> 8;
+}
+
+static int usb_descriptor_index(u16 wValue)
+{
+	return wValue & 0xFF;
+}
+
 static int usb_standard_get_descriptor(usbd_device *usbd_dev,
 				       struct usb_setup_data *req,
 				       u8 **buf, u16 *len)
 {
-	int i;
+	int i, array_idx, descr_idx;
 	struct usb_string_descriptor *sd;
 
-	switch (req->wValue >> 8) {
+	descr_idx = usb_descriptor_index(req->wValue);
+
+	switch (usb_descriptor_type(req->wValue)) {
 	case USB_DT_DEVICE:
 		*buf = (u8 *) usbd_dev->desc;
 		*len = MIN(*len, usbd_dev->desc->bLength);
-		return 1;
+		return USBD_REQ_HANDLED;
 	case USB_DT_CONFIGURATION:
 		*buf = usbd_dev->ctrl_buf;
-		*len = build_config_descriptor(usbd_dev, req->wValue & 0xff,
-					       *buf, *len);
-		return 1;
+		*len = build_config_descriptor(usbd_dev, descr_idx, *buf, *len);
+		return USBD_REQ_HANDLED;
 	case USB_DT_STRING:
 		sd = (struct usb_string_descriptor *)usbd_dev->ctrl_buf;
 
-		if (!usbd_dev->strings)
-			return 0; /* Device doesn't support strings. */
+		if (descr_idx == 0) {
+			/* Send sane Language ID descriptor... */
+			sd->wData[0] = USB_LANGID_ENGLISH_US;
+			sd->bLength = sizeof(sd->bLength) + sizeof(sd->bDescriptorType) 
+				+ sizeof(sd->wData[0]);
 
-		/* Check that string index is in range. */
-		for (i = 0; i <= (req->wValue & 0xff); i++)
-			if (usbd_dev->strings[i] == NULL)
-				return 0;
+			*len = MIN(*len, sd->bLength);
+		} else {
+			array_idx = descr_idx - 1;
+
+			if (!usbd_dev->strings)
+				return USBD_REQ_NOTSUPP; /* Device doesn't support strings. */
+			/* Check that string index is in range. */
+			if (array_idx >= usbd_dev->num_strings)
+				return USBD_REQ_NOTSUPP;
+
+			/* Strings with Language ID differnet from
+			 * USB_LANGID_ENGLISH_US are not supported */
+			if (req->wIndex != USB_LANGID_ENGLISH_US)
+				return USBD_REQ_NOTSUPP;
+
+			/* Ths string is returned as UTF16, hence the multiplication */
+			sd->bLength = strlen(usbd_dev->strings[array_idx]) * 2 +
+				sizeof(sd->bLength) + sizeof(sd->bDescriptorType);
+
+			*len = MIN(*len, sd->bLength);
+
+			for (i = 0; i < (*len / 2) - 1; i++)
+				sd->wData[i] =
+					usbd_dev->strings[array_idx][i];
+		}
 
-		sd->bLength = strlen(usbd_dev->strings[req->wValue & 0xff])
-				* 2 + 2;
 		sd->bDescriptorType = USB_DT_STRING;
-
 		*buf = (u8 *)sd;
-		*len = MIN(*len, sd->bLength);
 
-		for (i = 0; i < (*len / 2) - 1; i++)
-			sd->wData[i] =
-			    usbd_dev->strings[req->wValue & 0xff][i];
-
-		/* Send sane Language ID descriptor... */
-		if ((req->wValue & 0xff) == 0)
-			sd->wData[0] = 0x409;
-
-		return 1;
+		return USBD_REQ_HANDLED;
 	}
-	return 0;
+	return USBD_REQ_NOTSUPP;
 }
 
 static int usb_standard_set_address(usbd_device *usbd_dev,