STM32 PWM and DAC exercises

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1. Use STM32F103 to output a PWM waveform

1. Relevant resource preparation

Link: https://pan.baidu.com/s/13bnrB-S8Y6JDRdXBbzzbjA
Extraction code: pmf1

1): Follow the path in the figure below to find "1-Book supporting routines-F103VE guide" and download it

2): Unzip after downloading (32- TIM—Universal Timer- >2-TIM—Universal Timer-4 PWM Output)

2. Use keil to directly view the PWM waveform

1): Open the project

2): Related configuration changes
Magic wand->debug->Use Simulaor


3): Debug after compiling,

open the analysis window,

click setup,

enter GPIOA_IDR.6, select bit


4): Run to view the waveform (if you can’t see it) Scroll to view)

Two, STM32F103 DAC practice

1. Relevant resource preparation

Decompress "38-DAC—Sine Wave Output" in the supporting materials downloaded above, and download Au (I use Adobe_Audition_CS6), UltraEdit and WavToC converter on the Internet.

2. Convert and save audio files

1): Use music software to download your favorite music (preferably an mp3 file
) and convert it on Au.

Select the starting position. In the lower right corner, we set the duration to 2s, and the interval is automatically generated

2): Digital audio file generation.
Right-click the interval -> click the storage selection area to

change the sampling type.

Sampling 8khz, quantization 16bit, single channel

Save when you are done

3): Sine wave file generation
New audio file

sampling 8khz, quantization 16bit, single channel

Choose to generate the basic tone in the effect and

set it as shown in the figure

After zooming in, you can see the waveform as shown in the figure

Save

3. Use WavToC to convert audio files into c language code

1): Open WavToC, open the file,

select the file,

generate the code,

you can listen to it yourself, and then click to save the code, remember the number of output bytes here

The same is true for sine waves

4. Write the code and display the output with an oscilloscope

1). Convert digital audio song data to analog audio waveform output

Use Notepad to open the music audio code

Crtl+A and select all, copy and

open the previously unzipped "38-DAC—Sine Wave Output" project.

Change bsp—dac.c to
modify the code as shown in the figure:

Compile and generate hex file. After

burning, connect the board to the oscilloscope and you can see the output waveform

2). Output a sine wave with a period of 2khz

Copy the code

Modify the bsp-dac.c code as shown in the figure.

Compile and generate a hex file.

Here I forgot to use the oscilloscope to display the waveform, so there is no waveform.