TimerV2.0

A kittchen timer, mp3 player. STM32F103RET6, W25Q128, RX8025T, NS4168.

Feature

• software decode mp3, i2s output.
• 16MB spi flash disk.
• FATFS format.
• DFU Bootloader.

Known issues

• The USBLC6 (D1) will cost leakage when USB is not connect, can be avoid by disable the 'USB_EN' pin or simply cut the 5' pin of this component.
• USB disconnect interrupt can't be detected while device in sleep mode, may fix later.
• Sometimes return to main UI from the setting menu without expected, may fix later.
• I2S stream CLK has to be set as a half of the real sample rate.
• The NS4168 may cost about 2 mA current, not 1 uA provided by the datasheet.

Note

• This mp3 decode solution is a limited demo, don't use for any business application.
• More info can be found here:
• TimerV2.0/TimerApp/Middlewares/ST/STM32_Audio/Codecs/SpiritDSP_MP3_Dec/Release_Notes.html
• TimerV2.0/TimerApp/Middlewares/ST/STM32_Audio/Codecs/SpiritDSP_MP3_Dec/doc/SpiritMP3Dec_UG.pdf

About the '.dfu' file:

• ST DFU device can be flash by DfuSe or STM32CubeProgrammer
• The STM32CubeProgrammer supports both '.bin' and '.hex' file.
• DfuSe supports '.dfu' file only, so you have to convert the '.bin' or '.hex' file into a '.dfu'.
• To generate a '.dfu' file, there are some ways: like DfuFileMgr.exe(provide by ST), and some third-part tools like hex2dfu.exe.