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AN3126 Arkusz danych(PDF) 4 Page - STMicroelectronics

Numer części AN3126
Szczegółowy opis  Audio and waveform generation using the DAC in STM32 microcontrollers
PDF  24 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3126 Arkusz danych(HTML) 4 Page - STMicroelectronics

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AN3126
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List of figures
Figure 1.
DAC data format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 2.
STM32F100x DAC trigger channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 3.
DAC interaction without DMA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 4.
DAC interaction with DMA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 5.
Pseudo random code generator embedded in the DAC . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 6.
Noise waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 7.
Noise waveform with changeable offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 8.
Triangular waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 9.
Triangular waveform with changeable offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 10.
Non buffered channel voltage (with and without load) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 11.
Buffered channel voltage (with and without load) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 12.
Sine wave model samples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 13.
Sine wave generated with ns = 10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 14.
Sine wave generated with ns = 255 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 15.
Flow of data from MicroSD Flash memory to external speakers . . . . . . . . . . . . . . . . . . . . 18
Figure 16.
Wave Player flowchart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 17.
CPU and DMA activities during wave playing process . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21



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