The basic idea is that a positive feedback RC oscillator frequency selective network plus RC RC frequency selective network is the reason why elected sine wave because the capacitor charging curve.

KEY\Debug\Exe\KEY.hex
...\.....\...\KEY.out
...\.....\Obj\KEY.pbd
...\.....\...\main.o
...\.....\...\stm8s_gpio.o
...\.....\...\stm8s_it.o
...\FWLib\examples\Common\microsd.c
...\.....\........\......\microsd.h
...\.....\........\......\mono_lcd.c
...\.....\........\......\mono_lcd.h
...\.....\library\inc\stm8s.h
...\.....\.......\...\stm8s_adc1.h
...\.....\.......\...\stm8s_adc2.h
...\.....\.......\...\stm8s_awu.h
...\.....\.......\...\stm8s_beep.h
...\.....\.......\...\stm8s_can.h
...\.....\.......\...\stm8s_clk.h
...\.....\.......\...\stm8s_exti.h
...\.....\.......\...\stm8s_flash.h
...\.....\.......\...\stm8s_gpio.h
...\.....\.......\...\stm8s_i2c.h
...\.....\.......\...\stm8s_itc.h
...\.....\.......\...\stm8s_iwdg.h
...\.....\.......\...\stm8s_rst.h
...\.....\.......\...\stm8s_spi.h
...\.....\.......\...\stm8s_tim1.h
...\.....\.......\...\stm8s_tim2.h
...\.....\.......\...\stm8s_tim3.h
...\.....\.......\...\stm8s_tim4.h
...\.....\.......\...\stm8s_tim5.h
...\.....\.......\...\stm8s_tim6.h
...\.....\.......\...\stm8s_type.h
...\.....\.......\...\stm8s_uart1.h
...\.....\.......\...\stm8s_uart2.h
...\.....\.......\...\stm8s_uart3.h
...\.....\.......\...\stm8s_wwdg.h
...\.....\.......\src\stm8s_adc1.c
...\.....\.......\...\stm8s_adc2.c
...\.....\.......\...\stm8s_awu.c
...\.....\.......\...\stm8s_beep.c
...\.....\.......\...\stm8s_can.c
...\.....\.......\...\stm8s_clk.c
...\.....\.......\...\stm8s_exti.c
...\.....\.......\...\stm8s_flash.c
...\.....\.......\...\stm8s_gpio.c
...\.....\.......\...\stm8s_i2c.c
...\.....\.......\...\stm8s_itc.c
...\.....\.......\...\stm8s_iwdg.c
...\.....\.......\...\stm8s_rst.c
...\.....\.......\...\stm8s_spi.c
...\.....\.......\...\stm8s_tim1.c
...\.....\.......\...\stm8s_tim2.c
...\.....\.......\...\stm8s_tim3.c
...\.....\.......\...\stm8s_tim4.c
...\.....\.......\...\stm8s_tim5.c
...\.....\.......\...\stm8s_tim6.c
...\.....\.......\...\stm8s_uart1.c
...\.....\.......\...\stm8s_uart2.c
...\.....\.......\...\stm8s_uart3.c
...\.....\.......\...\stm8s_wwdg.c
...\KEY.dep
...\KEY.ewd
...\KEY.ewp
...\KEY.eww
...\main.c
...\settings\KEY.cspy.bat
...\........\KEY.dbgdt
...\........\KEY.dni
...\........\KEY.wsdt
...\stm8s_conf.h
...\stm8s_it.c
...\stm8s_it.h
...\FWLib\examples\Common
...\.....\library\inc
...\.....\.......\src
...\Debug\Exe
...\.....\List
...\.....\Obj
...\FWLib\examples
...\.....\library
...\Debug
...\FWLib
...\settings
KEY

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