Contents
What can a STM32 DAC be used for?
The STM32 DAC module is a 12-bit word converter, with up to three output channels to support audio functions. The DAC can be used in many audio applications such as security alarms, Bluetooth® headsets, talking toys, answering machines, man-machine interfaces, and low-cost music players.
What is the output impedance of STM32?
output impedance. Refer to the relevant STM32 datasheet for the specification of DAC output impedance (for example, for STM32F4 products, the resistive load resistance must be higher than 1.5 MΩ to have an output voltage drop below 1% of the output signal voltage). When enabling the buffer, the output and the desired voltages are similar (Figure 11
How to make a sine wave with DAC?
Then take a piece of paper (or some drawing application software on your PC) and draw the period of the sine wave with timing on the X axis. Then divide the drawn sine wave onto the samples, and decide how many samples you want to have (= how smooth your wave will be).
How to use DAC on openstm32 community site?
And, if you install System Workbench for Linux in System Workbench for STM32 you can seamlessly develop and debug asymmetric applications running partly on Linux, partly on the Cortex-M4. Forums » System Workbench for STM32 » How To Use DAC on STM32F4 Discovery?
What are the functions in dac.c file?
The dac.c file implements the two functions dac_init and dac_write. As part of initializing the DAC subsystem a DACConfig object is needed. This sets up an initial value for the data register in the DAC.
Which is waveform generator does the STM32 use?
The STM32 DAC provides the user with a triangular waveform generator with flexible offset, amplitude and frequency. The amplitude of the triangular waveform can be fixed using the MAMPx bits in the DAC_CR register. For more details about the triangular waveform refer to the dedicated sections in the reference manuals.
Which is an example of DSP in STM32?
For example, if FIR filter (Finite Impulse Response) has too much taps, whole loop process will be slow, and sampling ratio depends strongly of number of those elements. Out there exist specialized MCUs with additional hardware for floating point calculation (FPU), but our STM 32 or whatever MCU you are using, can do DSP.
Is it possible to do DSP in FIR filter?
Yes, DSP (Digital Signal Processing) is possible with some speed limitations. For example, if FIR filter (Finite Impulse Response) has too much taps, whole loop process will be slow, and sampling ratio depends strongly of number of those elements.
How to generate variable amplitude pseudo-noise in STM32?
In order to generate a variable-amplitude pseudo-noise, an LFSR (linear feedback shift register) is available. DAC noise generation is selected by setting WAVEx [1:0] to 01”. The preloaded value in LFSR is 0xAAA.
What do you need to know about St-audioweaver?
ST-AudioWeaver is an advanced tool for easy and optimized audio development and tuning on STM32 microcontrollers. The PC based tool utilizes a graphical interface that enables creating and tuning of advanced audio processing chains by simply dragging and dropping 160+ modules. No DSP coding skills are required.