ISD94100 Series Technical Reference Manual
Sep 9, 2019
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6.21.5.8 Peripheral DMA Request
Normal use of the audio DPWM is with PDMA. In this mode DPWM requests PDMA service
whenever there is space in FIFO. PDMA channel will copy data from a streaming buffer to the
DPWM FIFO and alert the CPU when buffer is empty. In this way an entire buffer of data can be
sent to DPWM without any CPU intervention.
6.21.5.9 Configuring DPWM Modulator
To operate the DPWM modulator the following configuration is recommended:
Enable DPWM clock source by register DPWMCKEN (CLK_APBCLK1[6]).
Reset DPWM IP block by register DPWMRST (SYS_IPRST2[6]).
Select sample rate based on current frequency of DPWM module.
Setup PDMA channel to provide data to DPWM.
Enable PDMA Request by using register PDMAEN (DPWM_PDMACTL[0]).
Enable DPWM Modulator by using register DPWMEN (DPWM_CTL[6]).
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