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machine/esp32c6: add default UART0 pins - #5756

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deadprogram merged 1 commit into
esp32c6-uart-interruptfrom
esp32c6-uart-default-pins
Sep 26, 2026
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machine/esp32c6: add default UART0 pins#5756
deadprogram merged 1 commit into
esp32c6-uart-interruptfrom
esp32c6-uart-default-pins

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@deadprogram

@deadprogram deadprogram commented Sep 26, 2026

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Stacked on #5755.

The ESP32-C6 UART.Configure had no default pins. Configure(UARTConfig{}) then returned errSamePins, so -serial=uart gave no output at all.

UART0 now defaults to TX on GPIO16 and RX on GPIO17, from ESP-IDF components/soc/esp32c6/include/soc/uart_pins.h. This is the same approach as the ESP32-H2.

@deadprogram
deadprogram added this pull request to stack #5757 September 26, 2026 13:28
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deadprogram commented Sep 26, 2026

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Tested on a XIAO ESP32-C6 with a jumper from GPIO16 to GPIO17. machine.UART0.Configure(machine.UARTConfig{}) returns nil and the loopback receives hello on every iteration.

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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
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  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
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  68808   68808      0   0.00%    9728    9728      0   0.00% tinygo build -size short -o ./build/test.hex -target=pyportal ./examples/flash/console/qspi
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  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
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  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
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  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
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  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
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  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
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  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
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  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/
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   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
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@deadprogram
machine/esp32c6: add default UART0 pins
f038045 
UART.Configure had no default pins, so Configure(UARTConfig{}) returned
errSamePins and -serial=uart gave no output. Use GPIO16 and GPIO17, the
defaults from ESP-IDF soc/esp32c6/include/soc/uart_pins.h.
@deadprogram
deadprogram force-pushed the esp32c6-uart-default-pins branch from 0c3d1f2 to f038045 Compare September 26, 2026 22:40
davecheney
davecheney approved these changes Sep 26, 2026
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does what is says on the tin, lgtm

@deadprogram

deadprogram commented Sep 26, 2026

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Thank you for reviews @zombieleet and @davecheney now merging stack.

@deadprogram
deadprogram merged commit 64c11cc into dev Sep 26, 2026
33 checks passed
@deadprogram
deadprogram deleted the esp32c6-uart-default-pins branch September 26, 2026 23:33
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@davecheney davecheney davecheney approved these changes
+1 more reviewer
@zombieleet zombieleet zombieleet approved these changes
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3 participants

@deadprogram @davecheney @zombieleet