fix SAMD21 PDMIn DMA event use
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ec335c1210
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79ee78e690
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@ -396,7 +396,7 @@ STATIC void dma_callback_fun(void *arg) {
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}
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}
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void audio_evsys_handler(void) {
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void audio_dma_evsys_handler(void) {
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for (uint8_t i = 0; i < AUDIO_DMA_CHANNEL_COUNT; i++) {
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audio_dma_t *dma = audio_dma_state[i];
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if (dma == NULL) {
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@ -101,6 +101,6 @@ void audio_dma_background(void);
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uint8_t find_sync_event_channel_raise(void);
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void audio_evsys_handler(void);
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void audio_dma_evsys_handler(void);
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#endif // MICROPY_INCLUDED_ATMEL_SAMD_AUDIO_DMA_H
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@ -35,6 +35,7 @@
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#include "common-hal/audiobusio/PDMIn.h"
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#include "shared-bindings/analogio/AnalogOut.h"
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#include "shared-bindings/audiobusio/PDMIn.h"
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#include "shared-bindings/microcontroller/__init__.h"
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#include "shared-bindings/microcontroller/Pin.h"
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#include "supervisor/shared/translate.h"
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@ -64,7 +65,20 @@
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#define SERCTRL(name) I2S_RXCTRL_ ## name
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#endif
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// Set by interrupt handler when DMA block has finished transferring.
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static bool pdmin_dma_block_done;
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// Event channel used to trigger interrupt. Set to invalid value EVSYS_SYNCH_NUM when not in use.
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static uint8_t pdmin_event_channel;
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void pdmin_evsys_handler(void) {
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if (pdmin_event_channel < EVSYS_SYNCH_NUM && event_interrupt_active(pdmin_event_channel)) {
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pdmin_dma_block_done = true;
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}
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}
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void pdmin_reset(void) {
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pdmin_event_channel = EVSYS_SYNCH_NUM;
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while (I2S->SYNCBUSY.reg & I2S_SYNCBUSY_ENABLE) {}
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I2S->INTENCLR.reg = I2S_INTENCLR_MASK;
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I2S->INTFLAG.reg = I2S_INTFLAG_MASK;
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@ -368,7 +382,8 @@ static uint16_t filter_sample(uint32_t pdm_samples[4]) {
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uint32_t common_hal_audiobusio_pdmin_record_to_buffer(audiobusio_pdmin_obj_t* self,
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uint16_t* output_buffer, uint32_t output_buffer_length) {
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uint8_t dma_channel = dma_allocate_channel();
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uint8_t event_channel = find_sync_event_channel_raise();
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pdmin_event_channel = find_sync_event_channel_raise();
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pdmin_dma_block_done = false;
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// We allocate two buffers on the stack to use for double buffering.
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const uint8_t samples_per_buffer = SAMPLES_PER_BUFFER;
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@ -391,7 +406,7 @@ uint32_t common_hal_audiobusio_pdmin_record_to_buffer(audiobusio_pdmin_obj_t* se
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#endif
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dma_configure(dma_channel, trigger_source, true);
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init_event_channel_interrupt(event_channel, CORE_GCLK, EVSYS_ID_GEN_DMAC_CH_0 + dma_channel);
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init_event_channel_interrupt(pdmin_event_channel, CORE_GCLK, EVSYS_ID_GEN_DMAC_CH_0 + dma_channel);
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// Turn on serializer now to get it in sync with DMA.
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i2s_set_serializer_enable(self->serializer, true);
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audio_dma_enable_channel(dma_channel);
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@ -402,23 +417,12 @@ uint32_t common_hal_audiobusio_pdmin_record_to_buffer(audiobusio_pdmin_obj_t* se
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uint32_t remaining_samples_needed = output_buffer_length;
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while (values_output < output_buffer_length) {
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if (event_interrupt_overflow(event_channel)) {
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// Looks like we aren't keeping up. We shouldn't skip a buffer so stop early.
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break;
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}
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// Wait for the next buffer to fill
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uint32_t wait_counts = 0;
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#ifdef SAMD21
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#define MAX_WAIT_COUNTS 1000
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#endif
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#ifdef SAM_D5X_E5X
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#define MAX_WAIT_COUNTS 6000
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#endif
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// If wait_counts exceeds the max count, buffer has probably stopped filling;
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// DMA may have missed an I2S trigger event.
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while (!event_interrupt_active(event_channel) && ++wait_counts < MAX_WAIT_COUNTS) {
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while (!pdmin_dma_block_done) {
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RUN_BACKGROUND_TASKS;
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}
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common_hal_mcu_disable_interrupts();
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pdmin_dma_block_done = false;
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common_hal_mcu_enable_interrupts();
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// The mic is running all the time, so we don't need to wait the usual 10msec or 100msec
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// for it to start up.
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@ -430,6 +434,7 @@ uint32_t common_hal_audiobusio_pdmin_record_to_buffer(audiobusio_pdmin_obj_t* se
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buffer = second_buffer;
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descriptor = &second_descriptor;
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}
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// Decimate and filter the buffer that was just filled.
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uint32_t samples_gathered = descriptor->BTCNT.reg / words_per_sample;
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// Don't run off the end of output buffer. Process only as many as needed.
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@ -472,7 +477,8 @@ uint32_t common_hal_audiobusio_pdmin_record_to_buffer(audiobusio_pdmin_obj_t* se
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}
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}
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disable_event_channel(event_channel);
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disable_event_channel(pdmin_event_channel);
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pdmin_event_channel = EVSYS_SYNCH_NUM; // Invalid event_channel.
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dma_free_channel(dma_channel);
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// Turn off serializer, but leave clock on, to avoid mic startup delay.
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i2s_set_serializer_enable(self->serializer, false);
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@ -481,5 +487,4 @@ uint32_t common_hal_audiobusio_pdmin_record_to_buffer(audiobusio_pdmin_obj_t* se
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}
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void common_hal_audiobusio_pdmin_record_to_file(audiobusio_pdmin_obj_t* self, uint8_t* buffer, uint32_t length) {
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}
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@ -46,6 +46,8 @@ typedef struct {
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void pdmin_reset(void);
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void pdmin_evsys_handler(void);
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void pdmin_background(void);
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#endif // MICROPY_INCLUDED_ATMEL_SAMD_COMMON_HAL_AUDIOBUSIO_AUDIOOUT_H
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@ -53,18 +53,42 @@
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#error Unknown chip family
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#endif
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#if CIRCUITPY_ANALOGIO
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#include "common-hal/analogio/AnalogIn.h"
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#include "common-hal/analogio/AnalogOut.h"
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#endif
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#if CIRCUITPY_AUDIOBUSIO
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#include "common-hal/audiobusio/PDMIn.h"
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#include "common-hal/audiobusio/I2SOut.h"
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#endif
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#if CIRCUITPY_AUDIOIO
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#include "common-hal/audioio/AudioOut.h"
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#endif
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#if CIRCUITPY_BUSIO_SPI
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#include "common-hal/busio/SPI.h"
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#endif
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#include "common-hal/microcontroller/Pin.h"
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#if CIRCUITPY_PULSEIO
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#include "common-hal/pulseio/PulseIn.h"
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#include "common-hal/pulseio/PulseOut.h"
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#endif
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#if CIRCUITPY_PWMIO
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#include "common-hal/pwmio/PWMOut.h"
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#endif
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#if CIRCUITPY_PS2IO
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#include "common-hal/ps2io/Ps2.h"
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#endif
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#if CIRCUITPY_RTC
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#include "common-hal/rtc/RTC.h"
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#endif
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#if CIRCUITPY_TOUCHIO_USE_NATIVE
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#include "common-hal/touchio/TouchIn.h"
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@ -516,8 +540,13 @@ void evsyshandler_common(void) {
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supervisor_tick();
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}
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#endif
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#if CIRCUITPY_AUDIOIO || CIRCUITPY_AUDIOBUSIO
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audio_evsys_handler();
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audio_dma_evsys_handler();
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#endif
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#if CIRCUITPY_AUDIOBUSIO
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pdmin_evsys_handler();
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#endif
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}
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