esp32: add interrupt support (vector table, timer alarm, GPIO SetInterrupt) by deadprogram · Pull Request #5510 · tinygo-org/tinygo

deadprogram · 2026-07-08T22:52:02Z

This PR add interrupt support (vector table, timer alarm, GPIO SetInterrupt) to the esp32.

It also then hooks the IRQ up for receiving UART data.

Tested locally on my venerable esp32-mini32 board.

UPDATE: added the support needed for XIP and also the linker changes for minimal espradio support.
FURTHER UPDATE: this PR turned into all the commits to get initial WiFI on ESP32 working as well.

This PR needs #5511 to correctly flash the larger programs.

github-actions · 2026-07-08T23:06:36Z

Size difference with the dev branch:

Binary size difference

 flash                          ram
 before   after   diff          before   after   diff
  19664   19664      0   0.00%    7052    7052      0   0.00% tinygo build -size short -o ./build/test.hex -target=feather-rp2040 ./examples/adafruit4650
  63188   63188      0   0.00%    6780    6780      0   0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/adt7410/main.go
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  14604   14604      0   0.00%    7388    7388      0   0.00% tinygo build -size short -o ./build/test.hex -target=pybadge ./examples/amg88xx
  10152   10152      0   0.00%    5340    5340      0   0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/apa102/main.go
  12572   12572      0   0.00%    7172    7172      0   0.00% tinygo build -size short -o ./build/test.hex -target=nano-33-ble ./examples/apds9960/proximity/main.go
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   7556    7556      0   0.00%    2304    2304      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/at24cx/main.go
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  67080   67080      0   0.00%    6796    6796      0   0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/bmi160/main.go
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  65688   65688      0   0.00%    6820    6820      0   0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/bmp280/main.go
  13048   13048      0   0.00%    5404    5404      0   0.00% tinygo build -size short -o ./build/test.hex -target=trinket-m0 ./examples/bmp388/main.go
  24000   24000      0   0.00%    6220    6220      0   0.00% tinygo build -size short -o ./build/test.hex -target=metro-rp2350 ./examples/bno08x/i2c/main.go
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  30528   30528      0   0.00%    5576    5576      0   0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/ds3231/alarms/main.go
  44464   44464      0   0.00%    5576    5576      0   0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/ds3231/basic/main.go
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  71852   71852      0   0.00%    7580    7580      0   0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/flash/console/spi
  67964   67964      0   0.00%    9620    9620      0   0.00% tinygo build -size short -o ./build/test.hex -target=pyportal ./examples/flash/console/qspi
   7096    7096      0   0.00%    2268    2268      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/gc9a01/main.go
  69264   69264      0   0.00%    6964    6964      0   0.00% tinygo build -size short -o ./build/test.hex -target=feather-m0 ./examples/gps/i2c/main.go
  69952   69952      0   0.00%    7108    7108      0   0.00% tinygo build -size short -o ./build/test.hex -target=feather-m0 ./examples/gps/uart/main.go
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  11568   11568      0   0.00%    5340    5340      0   0.00% tinygo build -size short -o ./build/test.hex -target=arduino-nano33 ./examples/hd44780i2c/main.go
  15440   15440      0   0.00%    7172    7172      0   0.00% tinygo build -size short -o ./build/test.hex -target=nano-33-ble ./examples/hts221/main.go
  16148   16148      0   0.00%    2348    2348      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/hub75/main.go
  11200   11200      0   0.00%    7516    7516      0   0.00% tinygo build -size short -o ./build/test.hex -target=pyportal ./examples/ili9341/basic
  12268   12268      0   0.00%    5476    5476      0   0.00% tinygo build -size short -o ./build/test.hex -target=xiao ./examples/ili9341/basic
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  29336   29336      0   0.00%    7420    7420      0   0.00% tinygo build -size short -o ./build/test.hex -target=feather-m4 ./examples/lsm303dlhc/main.go
  13560   13560      0   0.00%    5380    5380      0   0.00% tinygo build -size short -o ./build/test.hex -target=arduino-nano33 ./examples/lsm6ds3/main.go
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  10636   10636      0   0.00%    5380    5380      0   0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/mcp23017-multiple/main.go
  10648   10648      0   0.00%    5340    5340      0   0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/mcp3008/main.go
  73264   73264      0   0.00%    6836    6836      0   0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/mcp2515/main.go
  28288   28288      0   0.00%    4048    4048      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/microbitmatrix/main.go
  28312   28312      0   0.00%    6092    6092      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit-v2 ./examples/microbitmatrix/main.go
   8692    8692      0   0.00%    5340    5340      0   0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/mma8653/main.go
   8596    8596      0   0.00%    5332    5332      0   0.00% tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/mpu6050/main.go
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  13140   13140      0   0.00%    6208    6208      0   0.00% tinygo build -size short -o ./build/test.hex -target=feather-rp2040 ./examples/seesaw/soil-sensor
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   2889    2889      0   0.00%     560     560      0   0.00% tinygo build -size short -o ./build/test.hex -target=arduino ./examples/servo
  16616   16616      0   0.00%    6280    6280      0   0.00% tinygo build -size short -o ./build/test.hex -target=pico     ./examples/sgp30
   9076    9076      0   0.00%    7380    7380      0   0.00% tinygo build -size short -o ./build/test.hex -target=pybadge ./examples/shifter/main.go
  57864   57864      0   0.00%    3680    3680      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/sht3x/main.go
  57864   57864      0   0.00%    3688    3688      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/sht4x/main.go
  57872   57872      0   0.00%    3680    3680      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/shtc3/main.go
  13532   13532      0   0.00%    8964    8964      0   0.00% tinygo build -size short -o ./build/test.hex -target=xiao-ble ./examples/ssd1306/
  14404   14404      0   0.00%    6160    6160      0   0.00% tinygo build -size short -o ./build/test.hex -target=xiao-rp2040 ./examples/ssd1306/
  14504   14504      0   0.00%    6160    6160      0   0.00% tinygo build -size short -o ./build/test.hex -target=thumby ./examples/ssd1306/
   6052    6052      0   0.00%    2268    2268      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/ssd1331/main.go
   6900    6900      0   0.00%    2268    2268      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/st7735/main.go
   6628    6628      0   0.00%    2268    2268      0   0.00% tinygo build -size short -o ./build/test.hex -target=microbit ./examples/st7789/main.go
  18012   18012      0   0.00%    5332    5332      0   0.00% tinygo build -size short -o ./build/test.hex -target=circuitplay-express ./examples/thermistor/main.go
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  66696   66696      0   0.00%    6852    6852      0   0.00% tinygo build -size short -o ./build/test.hex -target=arduino-nano33 ./examples/ndir/main_ndir.go
  12444   12444      0   0.00%    6168    6168      0   0.00% tinygo build -size short -o ./build/test.uf2 -target=pico ./examples/mpu9150/main.go
  14464   14464      0   0.00%    6204    6204      0   0.00% tinygo build -size short -o ./build/test.hex -target=macropad-rp2040 ./examples/sh1106/macropad_spi
  11284   11284      0   0.00%    6632    6632      0   0.00% tinygo build -size short -o ./build/test.hex -target=macropad-rp2040 ./examples/encoders/quadrature-interrupt
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  13264   13264      0   0.00%    5144    5144      0   0.00% tinygo build -size short -o ./build/test.uf2 -target=nicenano ./examples/sharpmem/main.go
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  24140   24140      0   0.00%    7536    7536      0   0.00% tinygo build -size short -o ./build/test.hex -target=pico ./examples/w5500/main.go
  90116   90116      0   0.00%    8024    8024      0   0.00% tinygo build -size short -o ./build/test.hex -target=challenger-rp2040 ./examples/net/ntpclient/
 375408  375408      0   0.00%   17856   17856      0   0.00% tinygo build -size short -o ./build/test.hex -target=pyportal -stack-size 8kb ./examples/net/http-get/
 122804  122804      0   0.00%    8908    8908      0   0.00% tinygo build -size short -o ./build/test.hex -target=arduino-nano33 -stack-size 8kb ./examples/net/tcpclient/
 355204  355204      0   0.00%   17156   17156      0   0.00% tinygo build -size short -o ./build/test.hex -target=nano-rp2040 -stack-size 8kb ./examples/net/websocket/dial/
 105380  105380      0   0.00%   10888   10888      0   0.00% tinygo build -size short -o ./build/test.hex -target=metro-m4-airlift -stack-size 8kb ./examples/net/socket/
 419512  419512      0   0.00%   19884   19884      0   0.00% tinygo build -size short -o ./build/test.hex -target=matrixportal-m4 -stack-size 8kb ./examples/net/webstatic/
 169516  169516      0   0.00%   10908   10908      0   0.00% tinygo build -size short -o ./build/test.hex -target=arduino-mkrwifi1010 -stack-size 8kb ./examples/net/tlsclient/
 159260  159260      0   0.00%    9880    9880      0   0.00% tinygo build -size short -o ./build/test.hex -target=nano-rp2040 -stack-size 8kb ./examples/net/mqttclient/natiu/
 119128  119128      0   0.00%   14184   14184      0   0.00% tinygo build -size short -o ./build/test.hex -target=wioterminal -stack-size 8kb ./examples/net/webclient/
 369988  369988      0   0.00%   22996   22996      0   0.00% tinygo build -size short -o ./build/test.hex -target=wioterminal -stack-size 8kb ./examples/net/webserver/
 370940  370940      0   0.00%   22912   22912      0   0.00% tinygo build -size short -o ./build/test.hex -target=wioterminal -stack-size 8kb ./examples/net/mqttclient/paho/
 177440  177440      0   0.00%   14996   14996      0   0.00% tinygo build -size short -o ./build/test.hex -target=elecrow-rp2040 -stack-size 8kb ./examples/net/tlsclient/
 122644  122644      0   0.00%   13004   13004      0   0.00% tinygo build -size short -o ./build/test.hex -target=elecrow-rp2350 -stack-size 8kb ./examples/net/ntpclient/
6711598 6711598      0   0.00% 1093186 1093186      0   0.00%

deadprogram · 2026-07-09T13:41:44Z

A few more things to do on this, moving back to draft.

digitalentity · 2026-07-13T07:33:22Z

+        _arena_start = ABSOLUTE(.);
+    } >DRAM1
+    _arena_end = ORIGIN(DRAM1) + LENGTH(DRAM1);
+    ASSERT((_arena_end - _arena_start) >= 32K, "arena region < 32K")


I'm curious where and how are you using the .arena section.

See tinygo-org/espradio#54

…um version Signed-off-by: deadprogram <ron@hybridgroup.com>

…shing large programs This fixes the builder for ESP32 (original) by separating the RAM segments loadable by the ROM bootloader from flash-mapped segments (DROM/IROM) which require MMU setup by startup code. These changes are needed for to allow for ESP32 to correctly flashing large programs which as a result require XIP support. Signed-off-by: deadprogram <ron@hybridgroup.com>

Signed-off-by: deadprogram <ron@hybridgroup.com>

…rrupt) Signed-off-by: deadprogram <ron@hybridgroup.com>

Signed-off-by: deadprogram <ron@hybridgroup.com>

Add full flash XIP support for ESP32, enabling code and read-only data to execute/load directly from flash via the MMU cache rather than consuming precious SRAM. This increases available RAM from ~328KB to effectively unlimited for code/rodata, while keeping ~121KB for the Go heap. Changes: - src/device/esp/esp32.S: Add MMU initialization in call_start_cpu0 - Call ROM bootloader mmu_init() and cache_flash_mmu_set() to map DROM/IROM - Enable flash cache via ROM Cache_Read_Enable() - Fix tinygo_scanCurrentStack to spill all register windows for GC - targets/esp32-interrupts.S: Add exception diagnostics - targets/esp32.ld: Major linker script restructure for XIP - Add DROM (4MB @ 0x3F400000) and IROM (4MB @ 0x400D0000) regions - Move .rodata to DROM, main .text to IROM (both flash-mapped) - Keep boot code, vectors, and WiFi blob IRAM sections in SRAM0 - Create WiFi arena in SRAM1 pool 7/6 (64KB @ 0x3FFF0000) - Move .bss and heap to SRAM2 (200KB @ 0x3FFAE000), avoiding ROM/MAC regions - Add _drom_flash_addr variable (patched by builder with flash offset) - targets/esp32.json: Add linker wrap flags for malloc/free and WiFi functions Signed-off-by: deadprogram <ron@hybridgroup.com>

Signed-off-by: deadprogram <ron@hybridgroup.com>

Work around an lld (LLVM 22) bug where l32r PC-relative offsets are miscalculated when auto-generated .literal.* sections are prepended to .text.* sections by the linker script. The assembler emits .literal entries for movi instructions whose constants exceed the 12-bit signed range; lld then resolves the l32r relocations with incorrect offsets, causing every l32r in the boot code to load from the wrong literal pool entry. The symptom was a TG0WDT_SYS_RESET boot loop: the watchdog disable code loaded wrong register addresses via l32r and silently wrote to the wrong peripheral registers, leaving the watchdog running. Fix by constructing PS_WOE_MASK (0x40000) with movi+slli instead of a single large-constant movi, eliminating all auto-generated .literal section entries. This is compatible with both LLVM 20 and LLVM 22. Also revert DRAM origin to 0x3FFAE000 (200K) and remove rom_phyFuns symbols that belong in a separate WiFi commit. Signed-off-by: deadprogram <ron@hybridgroup.com>

Signed-off-by: deadprogram <ron@hybridgroup.com>

deadprogram marked this pull request as draft July 9, 2026 13:41

deadprogram changed the base branch from dev to esp32-improve-builder July 11, 2026 08:09

deadprogram force-pushed the esp32-irq-impl branch from 951120b to 750fc1f Compare July 11, 2026 08:09

deadprogram mentioned this pull request Jul 12, 2026

Support discontinuous memory #5518

Open

digitalentity reviewed Jul 13, 2026

View reviewed changes

deadprogram force-pushed the esp32-improve-builder branch from 9ab93af to 8aede78 Compare July 13, 2026 22:37

deadprogram force-pushed the esp32-irq-impl branch from 750fc1f to 5ab0afa Compare July 13, 2026 22:39

deadprogram marked this pull request as ready for review July 13, 2026 22:40

deadprogram mentioned this pull request Jul 13, 2026

feat: add ESP32 (LX6) WiFi support tinygo-org/espradio#54

Open

deadprogram added the esp32 label Jul 17, 2026

deadprogram force-pushed the esp32-improve-builder branch 2 times, most recently from a97c882 to 1adaa91 Compare July 18, 2026 13:24

deadprogram force-pushed the esp32-irq-impl branch 2 times, most recently from 3910033 to fed2b91 Compare July 18, 2026 20:05

deadprogram force-pushed the esp32-improve-builder branch from 1adaa91 to 9db0ed1 Compare July 19, 2026 10:26

deadprogram added 9 commits July 19, 2026 17:24

ci: fix sizediff check by updating to go 1.25, which is the new minim…

3b137c3

…um version Signed-off-by: deadprogram <ron@hybridgroup.com>

main: update to espflasher 0.7.1 and add flash erase progress tracker

a3077ea

Signed-off-by: deadprogram <ron@hybridgroup.com>

esp32: add interrupt support (vector table, timer alarm, GPIO SetInte…

b6a7f8e

…rrupt) Signed-off-by: deadprogram <ron@hybridgroup.com>

esp32: add interrupt-based UART RX and fix init order

20cde64

Signed-off-by: deadprogram <ron@hybridgroup.com>

targets/esp32: adjust memory usage and export required symbols for wifi

8371130

Signed-off-by: deadprogram <ron@hybridgroup.com>

esp32: add PHY DRAM symbols to linker

6071711

Signed-off-by: deadprogram <ron@hybridgroup.com>

deadprogram force-pushed the esp32-irq-impl branch from fed2b91 to 6071711 Compare July 19, 2026 16:51

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esp32: add interrupt support (vector table, timer alarm, GPIO SetInterrupt)#5510

esp32: add interrupt support (vector table, timer alarm, GPIO SetInterrupt)#5510
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deadprogram commented Jul 8, 2026 •

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