Here is a list of all modules:

[detail level 1234]

▼CM3 Defines	Defined Constants and Types for Cortex M3 core features
Debugging	Macros and functions to aid in debugging
▼Cortex Core Defines	libopencm3 Defined Constants and Types for the Cortex Core
Cortex Core Atomic support Defines	Atomic operation support
Cortex-M Data Watch and Trace unit.	System Control Space (SCS) => Data Watchpoint and Trace (DWT)
Cortex-M Flash Patch and Breakpoint (FPB) unit
Cortex-M Instrumentation Trace Macrocell (ITM)
▼Cortex-M MPU Defines	libopencm3 Cortex Memory Protection Unit
MPU Registers
MPU TYPE register fields	The MPU_TYPE register is always available, even if the MPU is not implemented
MPU CTRL register fields	Defines for the Control Register
MPU RNR register fields	Defines for the Region Number Register
MPU RBAR register fields	Defines for the Region Base Address Register
▼MPU RASR register fields	Defines for the Region Attribute and Size Register
MPU RASR Attributes	Not all attributes are available on v6m
▼Cortex-M NVIC Defines	libopencm3 Cortex Nested Vectored Interrupt Controller
NVIC Registers
Cortex M0/M3/M4 System Interrupts	IRQ numbers -3 and -6 to -9 are reserved
User interrupts for EFM32 Leopard Gecko series
▼Cortex-M System Control Block	The System Control Block is a section of the System Control Space
SCB Registers
SCB_CPUID Values
SCB_ICSR Values
SCB_VTOR Values
SCB_AICR Values
SCB_SCR Values
SCB_CCR Values
▼Cortex-M System Control Space	The System Control Space (SCS) is a memory-mapped 4KB address space that provides 32-bit registers for configuration, status reporting and control
SCS Registers
▼Cortex-M SysTick Defines	libopencm3 Defined Constants and Types for the Cortex SysTick
▼STK_CSR Values
Clock source selection
STK_RVR Values
STK_CALIB Values
Cortex-M Trace Port Interface Unit (TPIU)
▼Cortex Core Peripheral APIs	APIs for Cortex Core peripherals
DWT	libopencm3 Cortex-M Data Watchpoint and Trace unit
NVIC	libopencm3 Cortex Nested Vectored Interrupt Controller
SCB	libopencm3 Cortex-M System Control Block
SysTick	libopencm3 Cortex System Tick Timer
Coresight Registers	CoreSight Lock Status Registers and Lock Access Registers are documented for the DWT, ITM, FPB and TPIU peripherals
EFM32 LeopardGecko	Libraries for Energy Micro EFM32 Leopard Gecko series
▼Peripheral APIs	APIs for device peripherals
ACMP peripheral API	Analog Comparator helper functions
ADC peripheral API
BURTC peripheral API	Backup RTC helper functions
CMU peripheral API
DAC peripheral API
DMA peripheral API
EMU peripheral API	Energy Management Unit helper functions
GPIO peripheral API
I2C peripheral API	I²C helper functions
LETIMER peripheral API	Low Energy Timer helper functions
MSC peripheral API	Memory Systems Controller helper functions
PRS peripheral API	EFM32 Peripheral Reflex System (PRS)
RMU peripheral API	Reset Management Unit helper functions
RTC peripheral API	Real Time Clock helper functions
TIMER peripheral API
UART/USART peripheral API	UART/USART helper functions
WDOG peripheral API	Watchdog Module helper functions
USB peripheral API
▼EFM32 Leopard Gecko Defines	Defined Constants and Types for the Energy Micro EFM32 Leopard Gecko series
ACMP Defines	Defined Constants and Types for the Analog Comparator module
▼ADC Defines	Defined Constants and Types for the EFM32LG Analog to Digital Converter
ADC Channel Number
BURTC Defines	Defined Constants and Types for the Backup RTC
CMU Defines	Defined Constants and Types for the EFM32LG Clock Management Unit
▼DAC Defines	Defined Constants and Types for the D/A Converter module
DAC Channel Number
▼DMA Defines	Defined Constants and Types for the DMA module
DMA Channel Number
EMU Defines	Defined Constants and Types for the Energy Management Unit
GPIO Defines	Defined Constants and Types for the EFM32LG GPIO module
I2C Defines	Defined Constants and Types for the I²C module
LETIMER Defines	Defined Constants and Types for the Low Energy Timer
MSC Defines	Defined Constants and Types for the Memory Systems Controller
▼PRS Defines	Defined Constants and Types for the Peripheral Reflex System
PRS Channel Number
RMU Defines	Defined Constants and Types for the Reset Management Unit
RTC Defines	Defined Constants and Types for the Real Time Clock
▼TIMER Defines	Defined Constants and Types for the TIMER module
Timer Channel Number
UART Defines	Defined Constants and Types for the UART module
USART Defines	Defined Constants and Types for the USART module
USB Defines	Defined Constants and Types for the USB module
WDOG Defines	Defined Constants and Types for the Watchdog module
User interrupt service routines (ISR) prototypes for EFM32 Leopard Gecko series
USB Audio Type Definitions	Defined Constants and Types for the USB Audio Type Definitions
USB CDC Type Definitions	Defined Constants and Types for the USB CDC Type Definitions
USB HID Type Definitions	Defined Constants and Types for the USB HID Type Definitions
USB MSC Type Definitions	Defined Constants and Types for the USB MSC Type Definitions
USB Drivers	Defined Constants and Types for the USB Drivers
USB Standard Structure Definitions	Defined Constants and Types for the USB Standard Structure Definitions
User interrupt service routines (ISR) defaults for EFM32 Leopard Gecko series
Generic USB Drivers	Generic USB Drivers
Generic USB Control Requests	Generic USB Control Requests
Generic USB Standard Request Interface	Generic USB Standard Request Interface
Usb_msc