KConfig 语法学习
RTT 官方教程
https://www.rt-thread.org/document/site/#/development-tools/build-config-system/Kconfig

我自己写的IIC配置

    menuconfig BSP_USING_I2C			# I2C 菜单
        bool "Enable I2C BUS"			# 提示I2C 菜单
        default n						# 默认不使能I2C 菜单
		if BSP_USING_I2C				# 如果使能I2C 菜单
			config RT_USING_I2C_BITOPS 	# 定义了一组新的配置选项 软件模拟IIC  RT_USING_I2C_BITOPS  
				bool "Enable I2C BUS (software simulation)"		# 提示I2C 是软件模拟
				default n										# 默认不使能I2C 菜单
				if RT_USING_I2C_BITOPS							# 如果定义IIC  RT_USING_I2C_BITOPS  
					config BSP_I2C1_SCL_PIN						# 定义了一组新的配置选项 软件模拟IIC  scl 引脚  
						select RT_USING_PIN
						int "i2c1 scl pin number software simulation"  	# 提示这是iic的 scl引脚配置
						range 0 64										# 这里值得取值范围限制 
						default 22										# 这里值得取值范围限制 

					config BSP_I2C1_SDA_PIN								# 定义了一组新的配置选项 软件模拟IIC  sda 引脚  
						select RT_USING_PIN
						int "I2C1 sda pin number software simulation"	# 提示这是iic的 scl引脚配置
						range 0 64										# 这里值得取值范围限制 
						default 23 										# 这里值得取值范围限制 
				endif
			menuconfig RT_USING_HARDWARE_I2C					# I2C 硬件菜单
				bool "Enable I2C BUS (hardware simulation)"		# 提示I2C 是硬件模拟
				default n										# 默认不使能硬件I2C 
				if RT_USING_HARDWARE_I2C						# 如果使能硬件I2C 
					config BSP_USING_I2C1						# 定义了一组新的配置选项 硬件IIC1  
						bool "Enable I2C1 BUS"
						default n								# 默认不使能硬件I2C1
						if BSP_USING_I2C1
							config BSP_I2C1_SCL_PIN
								select RT_USING_PIN
								int "i2c1 scl pin number"
								range 0 64
								default 22

							config BSP_I2C1_SDA_PIN
								select RT_USING_PIN
								int "I2C1 sda pin number"
								range 0 64
								default 23
						endif
					config BSP_USING_I2C2
							bool "Enable I2C2 BUS"
							default n
							if BSP_USING_I2C2
								config BSP_I2C2_SCL_PIN
								int "i2c2 scl pin number"
								range 0 64
								default 22

								config BSP_I2C2_SDA_PIN
									int "I2C2 sda pin number"
									range 0 64
									default 23
							endif
				endif
		endif

效果如下