=> R0 = number of channels; rounded to 1,2,4 or 8, or 0 to read
R1 = DMA buffer size, in bytes for one channel, or 0 to read
R2 = sample period in µs (overall), or 0 to read
R3 = pointer to Channel Handler block (0 to preserve)
R4 = pointer to Scheduler (0 to preserve)
<= R0-R4 = previous values
Please note that R2 sets the sample period for all channels, so a call with R0=4 and R2=48 gives a sample period of 48/4 = 12 µs per channel, while the period of the sound system is 48 µs. Use the formula f=1/T to compute the sample rate (here 20.833 kHz). R1 specifies the DMA swap buffer length for one channel, the entire memory area has R1*R0 bytes.
All current settings may be read by using zero input parameters.
See PRM 4, page 18.
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