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Mic -> ADC -> DAC pipeline

ADC configuration

  • Resolution: 12bit (0 ~ 4096)
  • SYSCLK: 80MHz
  • Clock prescaler: 1
  • Total clock cycle: 60usec
  • Oversampling ratio: 32x (0 ~ (4096*32)/2^5=4096)
  • Oversampling right shift: 5bit

Audio sampling frequency: 80Hz/1/32/60 = 41.7kHz

TMR6 configuration for memory-to-peripheral(DAC) DMA

TMR6 counter period: 32 * 60 - 1 = 1919

Pins on Arduino connector

                                     [ ]
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  [ ]                                [ ]
  [ ]                                [ ]
  [ ]                                [ ]
  [*] 3.3V                           [ ]
  [ ] 5V                             [ ]
  [*] GND                            [ ]
  [ ]
  [ ]                                [ ]
                                     [ ]
  [ ]                                [ ]
  [ ]                                [ ]
  [*] PA4(DAC1 OUT1)                 [ ]
  [ ]                                [ ]
  [ ]                                [ ]
  [*] PC0(ADC1 IN1)                  [ ]

Note: it requires an analog fiter for AC coupling etc -- refer to this page.
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