Example codes for the board is as follow:

• PWM: https://github.com/uncle-yong/k210-hello_world_pwm (Freertos SDK)
• I2S: https://github.com/uncle-yong/K210-i2s_test2_n (Standalone SDK)

Unfortunately, there are issues on the Freertos SDK 5.0 for the I2S - I had to test it using the Standalone SDK.