8000 atmel-samd: Enable 8-bit audio recording support even though it'll be · sparkfun/circuitpython@6d9d683 · GitHub
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tannewttannewt
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atmel-samd: Enable 8-bit audio recording support even though it'll be
quiet. Also update the examples. Fixes adafruit#226
1 parent e1eb180 commit 6d9d683

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2 files changed

+19
-5
lines changed
  • atmel-samd/common-hal/audiobusio
  • shared-bindings/audiobusio

2 files changed

+19
-5
lines changed

‎atmel-samd/common-hal/audiobusio/PDMIn.c

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -96,8 +96,8 @@ void common_hal_audiobusio_pdmin_construct(audiobusio_pdmin_obj_t* self,
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mp_raise_RuntimeError("Unable to allocate audio DMA block counter.");
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}
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99-
if (bit_depth != 16 || !mono || oversample != 64) {
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mp_raise_NotImplementedError("");
99+
if (!(bit_depth == 16 || bit_depth == 8) || !mono || oversample != 64) {
100+
mp_raise_NotImplementedError("Only 8 or 16 bit mono with 64 oversample is supported.");
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}
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// TODO(tannewt): Use the DPLL to get a more precise sampling rate.

‎shared-bindings/audiobusio/PDMIn.c

Lines changed: 17 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -53,14 +53,28 @@
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//| :param bool mono: True when capturing a single channel of audio, captures two channels otherwise
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//| :param int oversample: Number of single bit samples to decimate into a final sample. Must be divisible by 8
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//|
56-
//| Simple record to buffer::
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//| Record 8-bit unsigned samples to buffer::
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//|
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//| import audiobusio
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//| import board
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//|
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//| # Prep a buffer to record into
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//| b = bytearray(200)
63-
//| with audiobusio.PDMIn(board.MICROPHONE_DATA, board.MICROPHONE_CLOCK) as mic:
63+
//| with audiobusio.PDMIn(board.MICROPHONE_CLOCK, board.MICROPHONE_DATA) as mic:
64+
//| mic.record(b, len(b))
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//|
66+
//| Record 16-bit unsigned samples to buffer::
67+
//|
68+
//| import audiobusio
69+
//| import board
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//|
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//| # Prep a buffer to record into. The array interface doesn't allow for
72+
//| # constructing with a set size so we append to it until we have the size
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//| # we want.
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//| b = array.array("H")
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//| for i in range(200):
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//| b.append(0)
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//| with audiobusio.PDMIn(board.MICROPHONE_CLOCK, board.MICROPHONE_DATA, bit_depth=16) as mic:
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//| mic.record(b, len(b))
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//|
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STATIC mp_obj_t audiobusio_pdmin_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *pos_args) {
@@ -70,7 +84,7 @@ STATIC mp_obj_t audiobusio_pdmin_make_new(const mp_obj_type_t *type, size_t n_ar
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_frequency, MP_ARG_INT, {.u_int = 8000} },
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{ MP_QSTR_bit_depth, MP_ARG_INT, {.u_int = 8} },
73-
{ MP_QSTR_mono, MP_ARG_BOOL,{.u_bool = false} },
87+
{ MP_QSTR_mono, MP_ARG_BOOL,{.u_bool = true} },
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{ MP_QSTR_oversample, MP_ARG_INT, {.u_int = 64} },
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};
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mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];

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