Here is a list of all files with brief descriptions:

[detail level 12345]

c_headers
adc
ADC_REGS.h
ADC_RW_API.h
bootloader
BOOTLOADER_REGS.h
BOOTLOADER_RW_API.h
comp
COMP_REGS.h
COMP_RW_API.h
crc
CRC_REGS.h
CRC_RW_API.h
dac
DAC_REGS.h
DAC_RW_API.h
dma
DMA_REGS.h
DMA_RW_API.h
event_fabric
EVENT_FABRIC_REGS.h
EVENT_FABRIC_RW_API.h
flash
FLASH_REGS.h
FLASH_RW_API.h
gpio
GPIO_REGS.h
GPIO_RW_API.h
i2c
I2C_REGS.h
I2C_RW_API.h
iomux
IOMUX_PIN_SEL.h
IOMUX_REGS.h
IOMUX_RW_API.h
mcu_ctrl
MCU_CTRL_REGS.h
MCU_CTRL_RW_API.h
opamp
OPAMP_REGS.h
OPAMP_RW_API.h
otp
OTP_REGS.h
OTP_RW_API.h
pl230
PL230_REGS.h
PL230_RW_API.h
rtc
RTC_REGS.h
RTC_RW_API.h
spi
SPI_REGS.h
SPI_RW_API.h
timer
TIMER_REGS.h
TIMER_RW_API.h
timer_timg_num_input2
TIMER_TIMG_NUM_INPUT2_REGS.h
TIMER_TIMG_NUM_INPUT2_RW_API.h
uart
UART_REGS.h
UART_RW_API.h
vref
VREF_REGS.h
VREF_RW_API.h
vultan_flash
VULTAN_FLASH_REGS.h
VULTAN_FLASH_RW_API.h
watchdog
WATCHDOG_REGS.h
WATCHDOG_RW_API.h
cmsis
CMSIS
Include
core_cm0.h	CMSIS Cortex-M0 Core Peripheral Access Layer Header File
core_cm0plus.h	CMSIS Cortex-M0+ Core Peripheral Access Layer Header File
core_cmFunc.h	CMSIS Cortex-M Core Function Access Header File
core_cmInstr.h	CMSIS Cortex-M Core Instruction Access Header File
Device
FD32M0P
Include
FD32M0P.h	CMSIS Cortex-M0+ Core Peripheral Access Layer Header File for Device FD32M0P
system_FD32M0P.h
Source
system_FD32M0P.c	CMSIS Cortex-M0+ Device Peripheral Access Layer Source File for Device <Device>
common
retarget
retarget.c
uart_stdout_mcu.c
uart_stdout_mcu.h
romtable_tests
romtable_tests.c
romtable_tests.h
hal
adc
adc.c
adc.h
common
config_id.h
utils.c
utils.h
comp
comp.c
comp.h
crc
crc.c
crc.h
dac
dac.c
dac.h
dma
dma.c
dma.h
event_fabric
event_fabric.c
event_fabric.h
flash
flash.c
flash.h
gpio
gpio.c
gpio.h
i2c
i2c.c
i2c.h
rtc
rtc_structs.h
spi
spi.c
spi.h
timer
timer.c
timer.h
uart
uart.c
uart.h
vref
vref.c
vref.h
vultan_flash
vultan_flash.c
vultan_flash.h