fix SAMD21 PDMIn DMA event use

ports/atmel-samd/audio_dma.c

@@ -396,7 +396,7 @@ STATIC void dma_callback_fun(void *arg) {
     }
 }
 
-void audio_evsys_handler(void) {
+void audio_dma_evsys_handler(void) {
     for (uint8_t i = 0; i < AUDIO_DMA_CHANNEL_COUNT; i++) {
         audio_dma_t *dma = audio_dma_state[i];
         if (dma == NULL) {

ports/atmel-samd/audio_dma.h

@@ -101,6 +101,6 @@ void audio_dma_background(void);
 
 uint8_t find_sync_event_channel_raise(void);
 
-void audio_evsys_handler(void);
+void audio_dma_evsys_handler(void);
 
 #endif  // MICROPY_INCLUDED_ATMEL_SAMD_AUDIO_DMA_H

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

@@ -35,6 +35,7 @@
 #include "common-hal/audiobusio/PDMIn.h"
 #include "shared-bindings/analogio/AnalogOut.h"
 #include "shared-bindings/audiobusio/PDMIn.h"
+#include "shared-bindings/microcontroller/__init__.h"
 #include "shared-bindings/microcontroller/Pin.h"
 #include "supervisor/shared/translate.h"
 
@@ -64,7 +65,20 @@
 #define SERCTRL(name) I2S_RXCTRL_ ## name
 #endif
 
+// Set by interrupt handler when DMA block has finished transferring.
+static bool pdmin_dma_block_done;
+// Event channel used to trigger interrupt. Set to invalid value EVSYS_SYNCH_NUM when not in use.
+static uint8_t pdmin_event_channel;
+
+void pdmin_evsys_handler(void) {
+    if (pdmin_event_channel < EVSYS_SYNCH_NUM && event_interrupt_active(pdmin_event_channel)) {
+        pdmin_dma_block_done = true;
+    }
+}
+
 void pdmin_reset(void) {
+    pdmin_event_channel = EVSYS_SYNCH_NUM;
+
     while (I2S->SYNCBUSY.reg & I2S_SYNCBUSY_ENABLE) {}
     I2S->INTENCLR.reg = I2S_INTENCLR_MASK;
     I2S->INTFLAG.reg = I2S_INTFLAG_MASK;
@@ -368,7 +382,8 @@ static uint16_t filter_sample(uint32_t pdm_samples[4]) {
 uint32_t common_hal_audiobusio_pdmin_record_to_buffer(audiobusio_pdmin_obj_t* self,
         uint16_t* output_buffer, uint32_t output_buffer_length) {
     uint8_t dma_channel = dma_allocate_channel();
-    uint8_t event_channel = find_sync_event_channel_raise();
+    pdmin_event_channel = find_sync_event_channel_raise();
+    pdmin_dma_block_done = false;
 
     // We allocate two buffers on the stack to use for double buffering.
     const uint8_t samples_per_buffer = SAMPLES_PER_BUFFER;
@@ -391,7 +406,7 @@ uint32_t common_hal_audiobusio_pdmin_record_to_buffer(audiobusio_pdmin_obj_t* se
     #endif
 
     dma_configure(dma_channel, trigger_source, true);
-    init_event_channel_interrupt(event_channel, CORE_GCLK, EVSYS_ID_GEN_DMAC_CH_0 + dma_channel);
+    init_event_channel_interrupt(pdmin_event_channel, CORE_GCLK, EVSYS_ID_GEN_DMAC_CH_0 + dma_channel);
     // Turn on serializer now to get it in sync with DMA.
     i2s_set_serializer_enable(self->serializer, true);
     audio_dma_enable_channel(dma_channel);
@@ -402,23 +417,12 @@ uint32_t common_hal_audiobusio_pdmin_record_to_buffer(audiobusio_pdmin_obj_t* se
 
     uint32_t remaining_samples_needed = output_buffer_length;
     while (values_output < output_buffer_length) {
-        if (event_interrupt_overflow(event_channel)) {
-            // Looks like we aren't keeping up. We shouldn't skip a buffer so stop early.
-            break;
-        }
-        // Wait for the next buffer to fill
-        uint32_t wait_counts = 0;
-        #ifdef SAMD21
-          #define MAX_WAIT_COUNTS 1000
-        #endif
-        #ifdef SAM_D5X_E5X
-          #define MAX_WAIT_COUNTS 6000
-        #endif
-        // If wait_counts exceeds the max count, buffer has probably stopped filling;
-        // DMA may have missed an I2S trigger event.
-        while (!event_interrupt_active(event_channel) && ++wait_counts < MAX_WAIT_COUNTS) {
+        while (!pdmin_dma_block_done) {
             RUN_BACKGROUND_TASKS;
         }
+        common_hal_mcu_disable_interrupts();
+        pdmin_dma_block_done = false;
+        common_hal_mcu_enable_interrupts();
 
         // The mic is running all the time, so we don't need to wait the usual 10msec or 100msec
         // for it to start up.
@@ -430,6 +434,7 @@ uint32_t common_hal_audiobusio_pdmin_record_to_buffer(audiobusio_pdmin_obj_t* se
             buffer = second_buffer;
             descriptor = &second_descriptor;
         }
+
         // Decimate and filter the buffer that was just filled.
         uint32_t samples_gathered = descriptor->BTCNT.reg / words_per_sample;
         // Don't run off the end of output buffer. Process only as many as needed.
@@ -472,7 +477,8 @@ uint32_t common_hal_audiobusio_pdmin_record_to_buffer(audiobusio_pdmin_obj_t* se
         }
     }
 
-    disable_event_channel(event_channel);
+    disable_event_channel(pdmin_event_channel);
+    pdmin_event_channel = EVSYS_SYNCH_NUM;  // Invalid event_channel.
     dma_free_channel(dma_channel);
     // Turn off serializer, but leave clock on, to avoid mic startup delay.
     i2s_set_serializer_enable(self->serializer, false);
@@ -481,5 +487,4 @@ uint32_t common_hal_audiobusio_pdmin_record_to_buffer(audiobusio_pdmin_obj_t* se
 }
 
 void common_hal_audiobusio_pdmin_record_to_file(audiobusio_pdmin_obj_t* self, uint8_t* buffer, uint32_t length) {
-
 }

ports/atmel-samd/common-hal/audiobusio/PDMIn.h

@@ -46,6 +46,8 @@ typedef struct {
 
 void pdmin_reset(void);
 
+void pdmin_evsys_handler(void);
+
 void pdmin_background(void);
 
 #endif // MICROPY_INCLUDED_ATMEL_SAMD_COMMON_HAL_AUDIOBUSIO_AUDIOOUT_H

ports/atmel-samd/common-hal/busio/I2C.c

@@ -36,7 +36,7 @@
 #include "shared-bindings/microcontroller/__init__.h"
 #include "supervisor/shared/translate.h"
 
-#include "common-hal/busio/SPI.h" // for never_reset_sercom
+#include "common-hal/busio/__init__.h"
 
 // Number of times to try to send packet if failed.
 #define ATTEMPTS 2

ports/atmel-samd/common-hal/busio/SPI.c

@@ -32,51 +32,16 @@
 #include "peripheral_clk_config.h"
 
 #include "supervisor/board.h"
+#include "common-hal/busio/__init__.h"
 #include "common-hal/microcontroller/Pin.h"
+
 #include "hal/include/hal_gpio.h"
 #include "hal/include/hal_spi_m_sync.h"
 #include "hal/include/hpl_spi_m_sync.h"
 
 #include "samd/dma.h"
 #include "samd/sercom.h"
 
-bool never_reset_sercoms[SERCOM_INST_NUM];
-
-void never_reset_sercom(Sercom *sercom) {
-    // Reset all SERCOMs except the ones being used by on-board devices.
-    Sercom *sercom_instances[SERCOM_INST_NUM] = SERCOM_INSTS;
-    for (int i = 0; i < SERCOM_INST_NUM; i++) {
-        if (sercom_instances[i] == sercom) {
-            never_reset_sercoms[i] = true;
-            break;
-        }
-    }
-}
-
-void allow_reset_sercom(Sercom *sercom) {
-    // Reset all SERCOMs except the ones being used by on-board devices.
-    Sercom *sercom_instances[SERCOM_INST_NUM] = SERCOM_INSTS;
-    for (int i = 0; i < SERCOM_INST_NUM; i++) {
-        if (sercom_instances[i] == sercom) {
-            never_reset_sercoms[i] = false;
-            break;
-        }
-    }
-}
-
-void reset_sercoms(void) {
-    // Reset all SERCOMs except the ones being used by on-board devices.
-    Sercom *sercom_instances[SERCOM_INST_NUM] = SERCOM_INSTS;
-    for (int i = 0; i < SERCOM_INST_NUM; i++) {
-        if (never_reset_sercoms[i]) {
-            continue;
-        }
-        // SWRST is same for all modes of SERCOMs.
-        sercom_instances[i]->SPI.CTRLA.bit.SWRST = 1;
-    }
-}
-
-
 void common_hal_busio_spi_construct(busio_spi_obj_t *self,
     const mcu_pin_obj_t *clock, const mcu_pin_obj_t *mosi,
     const mcu_pin_obj_t *miso) {

ports/atmel-samd/common-hal/busio/SPI.h

@@ -42,8 +42,4 @@ typedef struct {
     uint8_t MISO_pin;
 } busio_spi_obj_t;
 
-void reset_sercoms(void);
-void never_reset_sercom(Sercom *sercom);
-
-
 #endif // MICROPY_INCLUDED_ATMEL_SAMD_COMMON_HAL_BUSIO_SPI_H

ports/atmel-samd/common-hal/busio/UART.c

@@ -45,7 +45,7 @@
 
 #include "samd/sercom.h"
 
-#include "common-hal/busio/SPI.h" // for never_reset_sercom
+#include "common-hal/busio/__init__.h"
 
 #define UART_DEBUG(...) (void)0
 // #define UART_DEBUG(...) mp_printf(&mp_plat_print __VA_OPT__(,) __VA_ARGS__)

ports/atmel-samd/common-hal/busio/__init__.c

@@ -1 +1,63 @@
-// No busio module functions.
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016 Scott Shawcroft
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "samd/sercom.h"
+
+static bool never_reset_sercoms[SERCOM_INST_NUM];
+
+void never_reset_sercom(Sercom *sercom) {
+    // Reset all SERCOMs except the ones being used by on-board devices.
+    Sercom *sercom_instances[SERCOM_INST_NUM] = SERCOM_INSTS;
+    for (int i = 0; i < SERCOM_INST_NUM; i++) {
+        if (sercom_instances[i] == sercom) {
+            never_reset_sercoms[i] = true;
+            break;
+        }
+    }
+}
+
+void allow_reset_sercom(Sercom *sercom) {
+    // Reset all SERCOMs except the ones being used by on-board devices.
+    Sercom *sercom_instances[SERCOM_INST_NUM] = SERCOM_INSTS;
+    for (int i = 0; i < SERCOM_INST_NUM; i++) {
+        if (sercom_instances[i] == sercom) {
+            never_reset_sercoms[i] = false;
+            break;
+        }
+    }
+}
+
+void reset_sercoms(void) {
+    // Reset all SERCOMs except the ones being used by on-board devices.
+    Sercom *sercom_instances[SERCOM_INST_NUM] = SERCOM_INSTS;
+    for (int i = 0; i < SERCOM_INST_NUM; i++) {
+        if (never_reset_sercoms[i]) {
+            continue;
+        }
+        // SWRST is same for all modes of SERCOMs.
+        sercom_instances[i]->SPI.CTRLA.bit.SWRST = 1;
+    }
+}

ports/atmel-samd/common-hal/busio/__init__.h

@@ -0,0 +1,35 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2016 Scott Shawcroft
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_ATMEL_SAMD_COMMON_HAL_BUSIO_INIT_H
+#define MICROPY_INCLUDED_ATMEL_SAMD_COMMON_HAL_BUSIO_INIT_H
+
+void reset_sercoms(void);
+void allow_reset_sercom(Sercom *sercom);
+void never_reset_sercom(Sercom *sercom);
+
+
+#endif // MICROPY_INCLUDED_ATMEL_SAMD_COMMON_HAL_BUSIO_INIT_H

ports/atmel-samd/supervisor/port.c

@@ -53,18 +53,42 @@
 #error Unknown chip family
 #endif
 
+#if CIRCUITPY_ANALOGIO
 #include "common-hal/analogio/AnalogIn.h"
 #include "common-hal/analogio/AnalogOut.h"
+#endif
+
+#if CIRCUITPY_AUDIOBUSIO
 #include "common-hal/audiobusio/PDMIn.h"
 #include "common-hal/audiobusio/I2SOut.h"
+#endif
+
+#if CIRCUITPY_AUDIOIO
 #include "common-hal/audioio/AudioOut.h"
-#include "common-hal/busio/SPI.h"
+#endif
+
+#if CIRCUITPY_BUSIO
+#include "common-hal/busio/__init__.h"
+#endif
+
 #include "common-hal/microcontroller/Pin.h"
+
+#if CIRCUITPY_PULSEIO
 #include "common-hal/pulseio/PulseIn.h"
 #include "common-hal/pulseio/PulseOut.h"
+#endif
+
+#if CIRCUITPY_PWMIO
 #include "common-hal/pwmio/PWMOut.h"
+#endif
+
+#if CIRCUITPY_PS2IO
 #include "common-hal/ps2io/Ps2.h"
+#endif
+
+#if CIRCUITPY_RTC
 #include "common-hal/rtc/RTC.h"
+#endif
 
 #if CIRCUITPY_TOUCHIO_USE_NATIVE
 #include "common-hal/touchio/TouchIn.h"
@@ -516,8 +540,13 @@ void evsyshandler_common(void) {
         supervisor_tick();
     }
     #endif
+
     #if CIRCUITPY_AUDIOIO || CIRCUITPY_AUDIOBUSIO
-    audio_evsys_handler();
+    audio_dma_evsys_handler();
+    #endif
+
+    #if CIRCUITPY_AUDIOBUSIO
+    pdmin_evsys_handler();
     #endif
 }