wenkong_junshi/Examples/DAC/DACC_software_trigger_LFSR_noise

/*!
\file readme.txt
\brief description of DACC_software_trigger_LFSR_noise example

\version 2017-02-10, V1.0.0, firmware for GD32F30x
\version 2018-10-10, V1.1.0, firmware for GD32F30x
\version 2018-12-25, V2.0.0, firmware for GD32F30x
\version 2020-09-30, V2.1.0, firmware for GD32F30x
*/

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This example is based on the GD32F307C-EVAL-V1.1 board, it shows how to use DAC concurrent
mode software trigger to generate LFSR noise wave with different configurations.

DAC is configured as following:
- Data 12-bit right alligned.
- Software trigger DAC0_OUT0 and DAC0_OUT1.
- DAC0_OUT0/DAC0_OUT1 is configured as PA4/PA5.
- LFSR mode, with 0-9/0-10 bit masking and offset value 0x7f0.

After system start-up, the LFSR noise wave can be observed through the scilloscope.