esp32: add Bluetooth controller support - #5689
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The Bluetooth controller blob libbtdm_app.a gets most of its code from the ESP32 ROM. targets/esp32.ld gave no Bluetooth ROM symbol, so the blob could not link. This adds the 273 symbols that the blob and the driver need. The addresses come from ESP-IDF v5.5 components/esp_rom/esp32/ld/esp32.rom.ld and are the same on all ESP32 silicon revisions. The controller also uses exchange memory at 0x3FFB0000 and BSS at 0x3FFB8000. These addresses are fixed in ROM and were inside the stack and the Go heap. The new .btdm_reserved section keeps this 64K block free. The reservation occurs only when the espradio Bluetooth driver is linked in, because the section length tests for the driver symbol _btdm_mem_needed and --gc-sections removes that symbol with the driver. A program that uses Bluetooth has a heap of 122K. All other programs keep the full 186K. This is the first of three changes that give Bluetooth LE to the classic ESP32. The driver changes are in espradio.
MOVSP raises AllocaCause (EXCCAUSE 5) when the caller register window is not yet spilled. This is a request to spill, not a fault, but the handler treated every cause other than 4 as fatal and stopped the chip. The Bluetooth controller blob is the first code on this chip that uses MOVSP. Without this change btdm_controller_init stops with "EXC 00000005" as soon as the blob creates its controller task. _xt_alloca_exc rotates back to the caller window and enters the matching window underflow routine, which does the spill and returns to the MOVSP. The ESP32-S3 already has the same handler.
This was referenced Sep 17, 2026
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tinygo build -size short -o ./build/test.hex -target=arduino-mkrwifi1010 -stack-size 8kb ./examples/net/tlsclient/ 162992 162992 0 0.00% 9968 9968 0 0.00% tinygo build -size short -o ./build/test.hex -target=nano-rp2040 -stack-size 8kb ./examples/net/mqttclient/natiu/ 121552 121552 0 0.00% 14256 14256 0 0.00% tinygo build -size short -o ./build/test.hex -target=wioterminal -stack-size 8kb ./examples/net/webclient/ 381076 381076 0 0.00% 24404 24404 0 0.00% tinygo build -size short -o ./build/test.hex -target=wioterminal -stack-size 8kb ./examples/net/webserver/ 382320 382320 0 0.00% 24364 24364 0 0.00% tinygo build -size short -o ./build/test.hex -target=wioterminal -stack-size 8kb ./examples/net/mqttclient/paho/ 183116 183116 0 0.00% 14948 14948 0 0.00% tinygo build -size short -o ./build/test.hex -target=elecrow-rp2040 -stack-size 8kb ./examples/net/tlsclient/ 126620 126620 0 0.00% 13052 13052 0 0.00% tinygo build -size short -o ./build/test.hex -target=elecrow-rp2350 -stack-size 8kb ./examples/net/ntpclient/ 23544 23608 64 0.27% 8580 8580 0 0.00% tinygo build -size short -o ./build/test.bin -target=esp32-coreboard-v2 ./examples/gdew0154m09/main.go 12356 12420 64 0.52% 4688 4688 0 0.00% tinygo build -size short -o ./build/test.elf -target=m5stack-core2 ./examples/ft6336/basic/ 19904 19968 64 0.32% 4956 4956 0 0.00% tinygo build -size short -o ./build/test.elf -target=m5stack-core2 ./examples/ft6336/touchpaint/ 7027878 7028070 192 0.00% 1138530 1138530 0 0.00% |
Member
Author
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Review please! |
Member
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I'll review it right now. @deadprogram |
Member
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Thank you for review @sago35 now merging. |
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The classic ESP32 has a Bluetooth controller, but TinyGo could not build a
program that uses it. This adds the two target changes that the controller
needs. The driver itself is in espradio.
The ROM symbols
The controller blob
libbtdm_app.agets most of its code from the ESP32 ROM.targets/esp32.ldgave no Bluetooth ROM symbol, so the blob could not link.This adds the 273 symbols that the blob and the driver need. The addresses come
from ESP-IDF v5.5
components/esp_rom/esp32/ld/esp32.rom.ldand are the same onall ESP32 silicon revisions.
targets/esp32c3.ldandtargets/esp32s3.ldalready hold the same kind of table.
Seven more symbols that the blob refers to are BR/EDR only and are not in the
ROM. The blob refers to them from ROM patch trampolines that a Bluetooth Low
Energy program never dispatches, so the espradio driver gives empty bodies.
The reserved memory
The controller uses exchange memory at 0x3FFB0000 and BSS at 0x3FFB8000. These
addresses are fixed in ROM. They were inside the stack and the Go heap, so the
controller and the program wrote to the same memory.
The new
.btdm_reservedsection keeps this 64K block free. The reservationoccurs only when the espradio Bluetooth driver is linked in, because the
section length tests for the driver symbol
_btdm_mem_neededand--gc-sectionsremoves that symbol together with the driver:Measured on
esp32-mini32:examples/blinky1and every other program that does not use BluetoothBLEInit()A program that does not use Bluetooth keeps the full heap.
The alloca exception
MOVSPraisesAllocaCause(EXCCAUSE 5) when the caller register window is notyet spilled. This is a request to spill, not a fault, but the handler treated
every cause other than 4 as fatal and stopped the chip.
The Bluetooth controller blob is the first code on this chip that uses
MOVSP.Without this change
btdm_controller_initstops withEXC 00000005as soon asthe blob creates its controller task.
_xt_alloca_excrotates back to the caller window and enters the matchingwindow underflow routine, which does the spill and returns to the
MOVSP. TheESP32-S3 already has the same handler, so this makes the two chips agree.
Tests
On an
esp32-coreboard-v2, with the espradio and go-bluetooth changes:RF Init OK with coex, thencontroller enabled (BLE).advertisementexample is visible from a host scan, with thesame address that the controller reports at start.
discoverexample receives advertising reports, with namesand signal strength.
examples/blinky1still builds and runs, and its heap does not decrease.