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machine/esp32xx: add I2S support - #5787

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machine/esp32xx: add I2S support#5787
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esp32xx-i2s

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@deadprogram deadprogram commented Sep 29, 2026

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This PR adds I2S for the ESP32-C3, ESP32-C6 and ESP32-S3. They share the same I2S block, so one file covers all three, with a small glue file for each chip. On the S3 only I2S0 is supported.

The API matches the nRF52 and SAMD21 versions and piolib.I2S in tinygo-org/pio.

How it works

  1. Write copies samples into a ring of RAM buffers. GDMA channel 0 plays three descriptors in a circle. The EOF interrupt points each finished descriptor at the next full buffer, or at a silence buffer if none is ready. Playback has no gaps between writes, and samples can come from flash.
  2. Read works the same way on the IN_SUC_EOF interrupt.
  3. 16-bit stereo frames put left in the low half word. WriteMono plays each sample on both channels.
  4. 16 and 32 bit are supported. PDM and MCLK output are not supported yet.
  5. MCLK is 256 times the sample rate, from the 160 MHz PLL with the fractional divider search from IDF i2s_hal.c.
  6. The C6 clocks are in PCR, and the generated C6 DMA_Type has OUT_CONF0_CH0 at the wrong offset, so the C6 glue uses the IDF address.
  7. The CPU interrupt lines do not overlap the ones espradio uses for WiFi and BLE.

Testing with a PCM5102 DAC on a xiao-esp32c3 and a xiao-esp32s3

  1. Stereo at 44100, 48000 and 22050 Hz, with left and right checked by ear.
  2. Mono, silence when writes stop, and SetSampleFrequency while playing.
  3. WiFi scans while playing, using espradio.
  4. BLE advertising while playing. On the S3 this needs phy: make the PHY I2C critical section nesting safe espradio#74, which fixes an interrupt level that BLE init left at 3.

RX and the C6 build but are not tested on hardware.

This PR also adds pins for the esp32xx boards to the i2s-tone example, and smoke tests for xiao-esp32c3, xiao-esp32c6 and xiao-esp32s3.

@deadprogram
machine/esp32xx: add I2S support
5711a6e 
Adds I2S for the ESP32-C3, ESP32-C6 and ESP32-S3 (I2S0 only). Samples are
copied into a ring of RAM buffers. A GDMA EOF interrupt points each of the
three circular descriptors at the next full buffer or at silence, so
playback has no gaps between writes. The API is the same as on nRF52.

The CPU interrupt lines do not overlap the ones espradio uses for WiFi and
BLE.

Tested on a xiao-esp32c3 with a PCM5102 DAC at 22.05, 44.1 and 48 kHz,
in mono and stereo, also while BLE advertises and while WiFi scans. The
C6 and S3 build but are not tested on hardware.
@deadprogram
examples: add esp32xx pins to i2s-tone
e85454d 
Uses GPIO3 for BCK, GPIO4 for WS and GPIO5 for DIN. Also adds i2s-tone to
the smoke tests for xiao-esp32c3, xiao-esp32c6 and xiao-esp32s3.
@deadprogram deadprogram mentioned this pull request Sep 29, 2026
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Size difference with the dev branch:

Binary size difference 
 flash                          ram
 before   after   diff          before   after   diff
  19884   19884      0   0.00%    7060    7060      0   0.00% tinygo build -size short -o ./build/test.hex -target=feather-rp2040 ./examples/adafruit4650
  63316   63316      0   0.00%    6860    6860      0   0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/adt7410/main.go
  11300   11300      0   0.00%    5412    5412      0   0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/adxl345/main.go
  15460   15460      0   0.00%    7468    7468      0   0.00% tinygo build -size short -o ./build/test.hex -target=pybadge ./examples/amg88xx
  10516   10516      0   0.00%    5372    5372      0   0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/apa102/main.go
  13188   13188      0   0.00%    7204    7204      0   0.00% tinygo build -size short -o ./build/test.hex -target=nano-33-ble ./examples/apds9960/proximity/main.go
  12720   12720      0   0.00%    5384    5384      0   0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/apa102/itsybitsy-m0/main.go
   8840    8840      0   0.00%    2320    2320      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/at24cx/main.go
  10004   10004      0   0.00%    5412    5412      0   0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/bh1750/main.go
   9300    9300      0   0.00%    5412    5412      0   0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/blinkm/main.go
  71856   71856      0   0.00%    3728    3728      0   0.00% tinygo build -size short -o ./build/test.hex -target=pinetime     ./examples/bma42x/main.go
  67940   67940      0   0.00%    6828    6828      0   0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/bmi160/main.go
  29140   29140      0   0.00%    5412    5412      0   0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/bmp180/main.go
  66596   66596      0   0.00%    6860    6860      0   0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/bmp280/main.go
  13700   13700      0   0.00%    5444    5444      0   0.00% tinygo build -size short -o ./build/test.hex -target=trinket-m0 ./examples/bmp388/main.go
  24540   24540      0   0.00%    6300    6300      0   0.00% tinygo build -size short -o ./build/test.hex -target=metro-rp2350 ./examples/bno08x/i2c/main.go
   9256    9256      0   0.00%    3360    3360      0   0.00% tinygo build -size short -o ./build/test.hex -target=bluepill ./examples/ds1307/sram/main.go
  22868   22868      0   0.00%    3592    3592      0   0.00% tinygo build -size short -o ./build/test.hex -target=bluepill ./examples/ds1307/time/main.go
  31248   31248      0   0.00%    5644    5644      0   0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/ds3231/alarms/main.go
  45136   45136      0   0.00%    5644    5644      0   0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/ds3231/basic/main.go
   4760    4760      0   0.00%    2280    2280      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/easystepper/main.go
   6976    6976      0   0.00%    2344    2344      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/easystepper/async/main.go
  72952   72952      0   0.00%    7688    7688      0   0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/flash/console/spi
  68808   68808      0   0.00%    9728    9728      0   0.00% tinygo build -size short -o ./build/test.hex -target=pyportal ./examples/flash/console/qspi
   7540    7540      0   0.00%    2284    2284      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/gc9a01/main.go
  23684   23684      0   0.00%    8588    8588      0   0.00% tinygo build -size short -o ./build/test.bin -target=esp32-coreboard-v2 ./examples/gdew0154m09/main.go
  69800   69800      0   0.00%    7060    7060      0   0.00% tinygo build -size short -o ./build/test.hex -target=feather-m0 ./examples/gps/i2c/main.go
  70304   70304      0   0.00%    7164    7164      0   0.00% tinygo build -size short -o ./build/test.hex -target=feather-m0 ./examples/gps/uart/main.go
  10076   10076      0   0.00%    5436    5436      0   0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/hcsr04/main.go
   5880    5880      0   0.00%    2280    2280      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/hd44780/customchar/main.go
   5960    5960      0   0.00%    2280    2280      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/hd44780/text/main.go
  12036   12036      0   0.00%    5396    5396      0   0.00% tinygo build -size short -o ./build/test.hex -target=arduino-nano33 ./examples/hd44780i2c/main.go
  16068   16068      0   0.00%    7204    7204      0   0.00% tinygo build -size short -o ./build/test.hex -target=nano-33-ble ./examples/hts221/main.go
  16564   16564      0   0.00%    2428    2428      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/hub75/main.go
  11620   11620      0   0.00%    7612    7612      0   0.00% tinygo build -size short -o ./build/test.hex -target=pyportal ./examples/ili9341/basic
  14100   14100      0   0.00%    5572    5572      0   0.00% tinygo build -size short -o ./build/test.hex -target=xiao ./examples/ili9341/basic
  30972   30972      0   0.00%   38772   38772      0   0.00% tinygo build -size short -o ./build/test.hex -target=pyportal ./examples/ili9341/pyportal_boing
  11596   11596      0   0.00%    7612    7612      0   0.00% tinygo build -size short -o ./build/test.hex -target=pyportal ./examples/ili9341/scroll
  14124   14124      0   0.00%    5572    5572      0   0.00% tinygo build -size short -o ./build/test.hex -target=xiao ./examples/ili9341/scroll
 265908  265908      0   0.00%   47456   47456      0   0.00% tinygo build -size short -o ./build/test.hex -target=pyportal ./examples/ili9341/slideshow
  12340   12340      0   0.00%    5412    5412      0   0.00% tinygo build -size short -o ./build/test.hex -target=circuitplay-express ./examples/lis3dh/main.go
  15476   15476      0   0.00%    7204    7204      0   0.00% tinygo build -size short -o ./build/test.hex -target=nano-33-ble ./examples/lps22hb/main.go
  26600   26600      0   0.00%    2328    2328      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/lsm303agr/main.go
  29748   29748      0   0.00%    7460    7460      0   0.00% tinygo build -size short -o ./build/test.hex -target=feather-m4 ./examples/lsm303dlhc/main.go
  13988   13988      0   0.00%    5420    5420      0   0.00% tinygo build -size short -o ./build/test.hex -target=arduino-nano33 ./examples/lsm6ds3/main.go
  12580   12580      0   0.00%    5412    5412      0   0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/mag3110/main.go
  11356   11356      0   0.00%    5404    5404      0   0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/mcp23017/main.go
  11772   11772      0   0.00%    5412    5412      0   0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/mcp23017-multiple/main.go
  11716   11716      0   0.00%    5372    5372      0   0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/mcp3008/main.go
  74380   74380      0   0.00%    6940    6940      0   0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/mcp2515/main.go
  30376   30376      0   0.00%    4152    4152      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/microbitmatrix/main.go
  30328   30328      0   0.00%    6196    6196      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit-v2 ./examples/microbitmatrix/main.go
  10052   10052      0   0.00%    5412    5412      0   0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/mma8653/main.go
  10004   10004      0   0.00%    5412    5412      0   0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/mpu6050/main.go
  79540   79540      0   0.00%    8092    8092      0   0.00% tinygo build -size short -o ./build/test.hex -target=p1am-100 ./examples/p1am/main.go
  15632   15632      0   0.00%    6240    6240      0   0.00% tinygo build -size short -o ./build/test.hex -target=pico ./examples/pca9685/main.go
   6676    6676      0   0.00%    3292    3292      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/pcd8544/setbuffer/main.go
   5076    5076      0   0.00%    2284    2284      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/pcd8544/setpixel/main.go
  15376   15376      0   0.00%    6224    6224      0   0.00% tinygo build -size short -o ./build/test.hex -target=feather-rp2040 ./examples/seesaw/soil-sensor
  14992   14992      0   0.00%    6224    6224      0   0.00% tinygo build -size short -o ./build/test.hex -target=qtpy-rp2040 ./examples/seesaw/rotary-encoder
   2899    2899      0   0.00%     560     560      0   0.00% tinygo build -size short -o ./build/test.hex -target=arduino ./examples/servo
  17208   17208      0   0.00%    6304    6304      0   0.00% tinygo build -size short -o ./build/test.hex -target=pico     ./examples/sgp30
   9412    9412      0   0.00%    7412    7412      0   0.00% tinygo build -size short -o ./build/test.hex -target=pybadge ./examples/shifter/main.go
  58624   58624      0   0.00%    3728    3728      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/sht3x/main.go
  58576   58576      0   0.00%    3728    3728      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/sht4x/main.go
  58640   58640      0   0.00%    3728    3728      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/shtc3/main.go
  14268   14268      0   0.00%    9092    9092      0   0.00% tinygo build -size short -o ./build/test.hex -target=xiao-ble ./examples/ssd1306/
  15072   15072      0   0.00%    6264    6264      0   0.00% tinygo build -size short -o ./build/test.hex -target=xiao-rp2040 ./examples/ssd1306/
  15008   15008      0   0.00%    6256    6256      0   0.00% tinygo build -size short -o ./build/test.hex -target=thumby ./examples/ssd1306/
   6372    6372      0   0.00%    2284    2284      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/ssd1331/main.go
   7220    7220      0   0.00%    2284    2284      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/st7735/main.go
   6916    6916      0   0.00%    2284    2284      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/st7789/main.go
  18692   18692      0   0.00%    5364    5364      0   0.00% tinygo build -size short -o ./build/test.hex -target=circuitplay-express ./examples/thermistor/main.go
  11956   11956      0   0.00%    5180    5180      0   0.00% tinygo build -size short -o ./build/test.hex -target=circuitplay-bluefruit ./examples/tone
  11956   11956      0   0.00%    5364    5364      0   0.00% tinygo build -size short -o ./build/test.hex -target=arduino-nano33 ./examples/tm1637/main.go
  14212   14212      0   0.00%    6236    6236      0   0.00% tinygo build -size short -o ./build/test.hex -target=pico ./examples/touch/capacitive
  10764   10764      0   0.00%    7404    7404      0   0.00% tinygo build -size short -o ./build/test.hex -target=pyportal ./examples/touch/resistive/fourwire/main.go
  13800   13800      0   0.00%    7672    7672      0   0.00% tinygo build -size short -o ./build/test.hex -target=pyportal ./examples/touch/resistive/pyportal_touchpaint/main.go
  17132   17132      0   0.00%    5484    5484      0   0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/vl53l1x/main.go
  15804   15804      0   0.00%    5484    5484      0   0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/vl6180x/main.go
  26416   26416      0   0.00%   14368   14368      0   0.00% tinygo build -size short -o ./build/test.hex -target=feather-nrf52840-sense ./examples/waveshare-epd/epd1in54/main.go
   6788    6788      0   0.00%    2324    2324      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/waveshare-epd/epd2in13/main.go
   6468    6468      0   0.00%    2316    2316      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/waveshare-epd/epd2in13x/main.go
   6660    6660      0   0.00%    2324    2324      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/waveshare-epd/epd4in2/main.go
  31024   31024      0   0.00%   19304   19304      0   0.00% tinygo build -size short -o ./build/test.hex -target=pico ./examples/waveshare-epd/epd2in66b/main.go
   8628    8628      0   0.00%    5404    5404      0   0.00% tinygo build -size short -o ./build/test.hex -target=circuitplay-express ./examples/ws2812
   6122    6122      0   0.00%    8464    8464      0   0.00% tinygo build -size short -o ./build/test.bin -target=m5stamp-c3          ./examples/ws2812
  64636   64636      0   0.00%    6580    6580      0   0.00% tinygo build -size short -o ./build/test.hex -target=feather-nrf52840 ./examples/is31fl3731/main.go
   1799    1799      0   0.00%     600     600      0   0.00% tinygo build -size short -o ./build/test.hex -target=arduino   ./examples/ws2812
   1280    1280      0   0.00%     182     182      0   0.00% tinygo build -size short -o ./build/test.hex -target=digispark ./examples/ws2812
   7776    7776      0   0.00%    8744    8744      0   0.00% tinygo build -size short -o ./build/test.bin -target=xiao-esp32c3 ./examples/ws2812
  33364   33364      0   0.00%    5412    5412      0   0.00% tinygo build -size short -o ./build/test.hex -target=trinket-m0 ./examples/bme280/main.go
  18204   18204      0   0.00%    5348    5348      0   0.00% tinygo build -size short -o ./build/test.hex -target=circuitplay-express ./examples/microphone/main.go
  12964   12964      0   0.00%    5364    5364      0   0.00% tinygo build -size short -o ./build/test.hex -target=circuitplay-express ./examples/buzzer/main.go
  13924   13924      0   0.00%    5412    5412      0   0.00% tinygo build -size short -o ./build/test.hex -target=trinket-m0 ./examples/veml6070/main.go
   8388    8388      0   0.00%    5364    5364      0   0.00% tinygo build -size short -o ./build/test.hex -target=arduino-nano33 ./examples/l293x/simple/main.go
  10340   10340      0   0.00%    5364    5364      0   0.00% tinygo build -size short -o ./build/test.hex -target=arduino-nano33 ./examples/l293x/speed/main.go
   8372    8372      0   0.00%    5364    5364      0   0.00% tinygo build -size short -o ./build/test.hex -target=arduino-nano33 ./examples/l9110x/simple/main.go
  10756   10756      0   0.00%    5364    5364      0   0.00% tinygo build -size short -o ./build/test.hex -target=arduino-nano33 ./examples/l9110x/speed/main.go
   8180    8180      0   0.00%    3324    3324      0   0.00% tinygo build -size short -o ./build/test.hex -target=nucleo-f103rb ./examples/shiftregister/main.go
   7596    7596      0   0.00%    2288    2288      0   0.00% tinygo build -size short -o ./build/test.hex -target=hifive1b ./examples/ssd1351/main.go
  15156   15156      0   0.00%    5412    5412      0   0.00% tinygo build -size short -o ./build/test.hex -target=circuitplay-express ./examples/lis2mdl/main.go
  12852   12852      0   0.00%    5388    5388      0   0.00% tinygo build -size short -o ./build/test.hex -target=arduino-nano33 ./examples/max72xx/main.go
  79812   79812      0   0.00%    7008    7008      0   0.00% tinygo build -size short -o ./build/test.hex -target=feather-m0 ./examples/dht/main.go
  40012   40012      0   0.00%    6812    6812      0   0.00% tinygo build -size short -o ./build/test.hex -target=feather-rp2040 ./examples/pcf8523/
  72980   72980      0   0.00%    7048    7048      0   0.00% tinygo build -size short -o ./build/test.hex -target=xiao ./examples/pcf8563/alarm/
   8980    8980      0   0.00%    5404    5404      0   0.00% tinygo build -size short -o ./build/test.hex -target=xiao ./examples/pcf8563/clkout/
  67680   67680      0   0.00%    7044    7044      0   0.00% tinygo build -size short -o ./build/test.hex -target=xiao ./examples/pcf8563/time/
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@deadprogram deadprogram mentioned this pull request Sep 29, 2026
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