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nrf: i2s: rewrite without 'goto'

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This commit is contained in:
jepler 2019-09-09 19:26:18 -05:00
parent fe9605a6a3
commit c66f5a8536
1 changed files with 18 additions and 16 deletions
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34
ports/nrf/common-hal/audiobusio/I2SOut.c
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@ -112,20 +112,7 @@ static void i2s_buffer_fill(audiobusio_i2sout_obj_t* self) {
self->next_buffer = !self->next_buffer;
size_t bytesleft = self->buffer_length;
if (self->paused || self->stopping) {
if (self->stopping) {
NRF_I2S->TASKS_STOP = 1;
self->playing = false;
}
stopping: ;
uint32_t *bp = (uint32_t*)buffer;
uint32_t *be = (uint32_t*)(buffer + bytesleft);
for (; bp != be; )
*bp++ = self->hold_value;
return;
}
while (bytesleft) {
while (!self->paused && !self->stopping && bytesleft) {
if (self->sample_data == self->sample_end) {
uint32_t sample_buffer_length;
audioio_get_buffer_result_t get_buffer_result =
@ -137,12 +124,12 @@ stopping: ;
audiosample_reset_buffer(self->sample, false, 0);
} else {
self->stopping = true;
goto stopping;
break;
}
}
if (get_buffer_result == GET_BUFFER_ERROR || sample_buffer_length == 0) {
self->stopping = true;
goto stopping;
break;
}
}
uint16_t bytecount = MIN(bytesleft, (size_t)(self->sample_end - self->sample_data));
@ -180,6 +167,21 @@ stopping: ;
// For 8-bit stereo and 16-bit mono, 2 copies of the final sample are required
self->hold_value = 0x00010001 * *(uint16_t*)(buffer-2);
}
// Emulate pausing and stopping by filling the DMA buffer with copies of
// the last sample. This includes the case where this iteration of
// i2s_buffer_fill exhausted a non-looping sample.
if (self->paused || self->stopping) {
if (self->stopping) {
NRF_I2S->TASKS_STOP = 1;
self->playing = false;
}
uint32_t *bp = (uint32_t*)buffer;
uint32_t *be = (uint32_t*)(buffer + bytesleft);
for (; bp != be; )
*bp++ = self->hold_value;
return;
}
}
void common_hal_audiobusio_i2sout_construct(audiobusio_i2sout_obj_t* self,