esp2s2: enlarge stack-buffer, use it instead of i2s_zero_dma_buffer
.. it's not clear that there was a problem with i2s_zero_dma_buffer, but just in case.
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@ -24,6 +24,8 @@
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* THE SOFTWARE.
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*/
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#include <string.h>
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#include "py/runtime.h"
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#include "i2s_common.h"
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@ -69,8 +71,17 @@ static void i2s_fill_buffer(i2s_t *self) {
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if (self->instance < 0 || self->instance >= I2S_NUM_MAX) {
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return;
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}
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if (self->paused || !self->sample) {
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i2s_zero_dma_buffer(self->instance);
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#define STACK_BUFFER_SIZE (512)
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int16_t signed_samples[STACK_BUFFER_SIZE / sizeof(int16_t)];
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mp_printf(&mp_plat_print, "playing=%d paused=%d stopping=%d sample@%p sample_data=%p..%p\n", self->playing, self->paused, self->stopping, self->sample, self->sample_data, self->sample_end);
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if (!self->playing || self->paused || !self->sample) {
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memset(signed_samples, 0, sizeof(signed_samples));
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size_t bytes_written = 0;
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do {
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ESP_CALL_RAISE(i2s_write(self->instance, signed_samples, sizeof(signed_samples), &bytes_written, 0));
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} while (bytes_written != 0);
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return;
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}
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while (!self->stopping) {
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@ -102,7 +113,6 @@ static void i2s_fill_buffer(i2s_t *self) {
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ESP_CALL_RAISE(i2s_write_expand(self->instance, self->sample_data, bytecount, 8, 16, &bytes_written, 0));
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}
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} else {
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#define STACK_BUFFER_SIZE (64)
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const size_t bytes_per_output_frame = 4;
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size_t bytes_per_input_frame = self->channel_count * self->bytes_per_sample;
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size_t framecount = MIN(STACK_BUFFER_SIZE / bytes_per_output_frame, bytecount / bytes_per_input_frame);
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