The sai_interrupt example shows how to use sai functional API to implement interrupt playback:In this example, one sai instance playbacks the audio data stored in flash/SRAM using interrupt.

The sai_interrupt_record_playback example shows how to use sai driver with record and playback features: In this example, one sai instance record the audio data from input and playbacks the audio data.

The sai_interrupt_transfer example shows how to use sai driver with interrupt:In this example, one sai instance playbacks the audio data stored in flash/SRAM using interrupt.

The SAI Demo application demonstrates complicated digital audio playback and record case. The demo provide these features below:1. Duplex audio transfer, record and playback at same time.2. Playback a 250 Hz sine wave data generated by CMSIS-DSP library. Also compute the fundamental frequency using Fast Fourier Transform with CMSIS-DSP library.3. Record a 5 seconds audio to sdcard with a FatFs system. After record, playback it. This feature may only existed in platform which support sdhc.

The Shell Demo application demonstrates to control Leds by commands.

The uart_edma ring buffer example shows how to use uart driver with EDMA:In this example, one uart instance connect to PC through uart, the board willsend back all characters that PC send to the board.

The uart_functioncal_interrupt example shows how to use uart driver functionalAPI to receive data with interrupt method:In this example, one uart instance connect to PC through uart, the board willsend back all characters that PC send to the board.

The uart_interrupt example shows how to use uart driver in interrupt way:In this example, one uart instance connect to PC through uart, the board willsend back all characters that PC send to the board.Note: The example echo every 8 characters, so input 8 characters every time.

The uart_polling example shows how to use uart driver in polling way:In this example, one uart instance connect to PC through uart, the board will send back all characters that PCsend to the board.

In this example, the adc16 module is initiealized and used to measure the VREF output voltage. So, it cannot use interal VREF as the reference voltage. Then, user should configure the VREF output pin as the ADC16's sample input. When running the project, it will firstly measure the VREF output voltage within the default (factory) trim value. Then, it will measure the VREF output voltage under different trim value.