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Merged
xushiwei merged 3 commits into from
Feb 5, 2026
Merged

feat(esp32c3): QEMU emulator support #1536

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e16ec43
fix: correct ESP32-C3 QEMU image offset for emulator support
luoliwoshang Jan 8, 2026
fcf1346
feat: add QEMU emulator configuration for ESP32-C3
luoliwoshang Jan 8, 2026
9d6314c
chore: add trailing newlines to ESP32-C3 target files
luoliwoshang Jan 8, 2026
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10 changes: 6 additions & 4 deletions internal/firmware/esp.go
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Original file line number Diff line number Diff line change
Expand Up @@ -84,10 +84,12 @@ func makeESPFirmareImage(infile, outfile, format string) error {
}

if makeImage {
// The bootloader starts at 0x1000, or 4096.
// TinyGo doesn't use a separate bootloader and runs the entire
// application in the bootloader location.
outf.Write(make([]byte, 4096))
// For QEMU emulation, we need to place the image at the correct offset.
// ESP32 (Xtensa): bootloader starts at 0x1000, so we pad 4KB of zeros.
// ESP32-C3 (RISC-V): bootloader starts at 0x0, so no padding needed.
if chip == "esp32" {
outf.Write(make([]byte, 4096))
Comment on lines +90 to +91
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@gemini-code-assist gemini-code-assist bot Jan 8, 2026

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medium

To improve readability and maintainability, it's good practice to avoid magic values. Consider defining "esp32" and 4096 as named constants at a suitable scope (e.g., package-level). This makes the code's intent clearer and centralizes these values for easier updates in the future.

For example:

const (
    esp32ChipName          = "esp32"
    esp32BootloaderPadding = 4096
)

Then you can use these constants here:

if chip == esp32ChipName {
    outf.Write(make([]byte, esp32BootloaderPadding))
}

}
}

// Chip IDs. Source:
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28 changes: 28 additions & 0 deletions targets/esp32c3-basic.json
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Original file line number Diff line number Diff line change
@@ -0,0 +1,28 @@
{
"inherits": [
"riscv32-esp"
],
"features": "+32bit,+c,+m,+zmmul,-a,-b,-d,-e,-experimental-smmpm,-experimental-smnpm,-experimental-ssnpm,-experimental-sspm,-experimental-ssqosid,-experimental-supm,-experimental-zacas,-experimental-zalasr,-experimental-zicfilp,-experimental-zicfiss,-f,-h,-relax,-shcounterenw,-shgatpa,-shtvala,-shvsatpa,-shvstvala,-shvstvecd,-smaia,-smcdeleg,-smcsrind,-smepmp,-smstateen,-ssaia,-ssccfg,-ssccptr,-sscofpmf,-sscounterenw,-sscsrind,-ssstateen,-ssstrict,-sstc,-sstvala,-sstvecd,-ssu64xl,-svade,-svadu,-svbare,-svinval,-svnapot,-svpbmt,-v,-xcvalu,-xcvbi,-xcvbitmanip,-xcvelw,-xcvmac,-xcvmem,-xcvsimd,-xesppie,-xsfcease,-xsfvcp,-xsfvfnrclipxfqf,-xsfvfwmaccqqq,-xsfvqmaccdod,-xsfvqmaccqoq,-xsifivecdiscarddlone,-xsifivecflushdlone,-xtheadba,-xtheadbb,-xtheadbs,-xtheadcmo,-xtheadcondmov,-xtheadfmemidx,-xtheadmac,-xtheadmemidx,-xtheadmempair,-xtheadsync,-xtheadvdot,-xventanacondops,-xwchc,-za128rs,-za64rs,-zaamo,-zabha,-zalrsc,-zama16b,-zawrs,-zba,-zbb,-zbc,-zbkb,-zbkc,-zbkx,-zbs,-zca,-zcb,-zcd,-zce,-zcf,-zcmop,-zcmp,-zcmt,-zdinx,-zfa,-zfbfmin,-zfh,-zfhmin,-zfinx,-zhinx,-zhinxmin,-zic64b,-zicbom,-zicbop,-zicboz,-ziccamoa,-ziccif,-zicclsm,-ziccrse,-zicntr,-zicond,-zicsr,-zifencei,-zihintntl,-zihintpause,-zihpm,-zimop,-zk,-zkn,-zknd,-zkne,-zknh,-zkr,-zks,-zksed,-zksh,-zkt,-ztso,-zvbb,-zvbc,-zve32f,-zve32x,-zve64d,-zve64f,-zve64x,-zvfbfmin,-zvfbfwma,-zvfh,-zvfhmin,-zvkb,-zvkg,-zvkn,-zvknc,-zvkned,-zvkng,-zvknha,-zvknhb,-zvks,-zvksc,-zvksed,-zvksg,-zvksh,-zvkt,-zvl1024b,-zvl128b,-zvl16384b,-zvl2048b,-zvl256b,-zvl32768b,-zvl32b,-zvl4096b,-zvl512b,-zvl64b,-zvl65536b,-zvl8192b",
"build-tags": [
"esp32c3",
"esp"
],
"serial": "usb",
"rtlib": "compiler-rt",
"libc": "newlib-esp32",
"linkerscript": "targets/esp32c3.memory.ld",
"binary-format": "esp32c3",
"flash-command": "esptool.py --chip=esp32c3 --port {port} write_flash 0x0 {bin}",
"serial-port": [
"303a:1001"
],
"openocd-interface": "esp_usb_jtag",
"openocd-target": "esp32c3",
"openocd-commands": [
"gdb_memory_map disable"
],
"gdb": [
"riscv32-esp-elf-gdb"
],
"emulator": "qemu-system-riscv32 -machine esp32c3 -nographic -drive file={img},if=mtd,format=raw -serial mon:stdio"
}
24 changes: 1 addition & 23 deletions targets/esp32c3.json
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Original file line number Diff line number Diff line change
@@ -1,30 +1,8 @@
{
"inherits": [
"riscv32-esp"
"esp32c3-basic"
],
"features": "+32bit,+c,+m,+zmmul,-a,-b,-d,-e,-experimental-smmpm,-experimental-smnpm,-experimental-ssnpm,-experimental-sspm,-experimental-ssqosid,-experimental-supm,-experimental-zacas,-experimental-zalasr,-experimental-zicfilp,-experimental-zicfiss,-f,-h,-relax,-shcounterenw,-shgatpa,-shtvala,-shvsatpa,-shvstvala,-shvstvecd,-smaia,-smcdeleg,-smcsrind,-smepmp,-smstateen,-ssaia,-ssccfg,-ssccptr,-sscofpmf,-sscounterenw,-sscsrind,-ssstateen,-ssstrict,-sstc,-sstvala,-sstvecd,-ssu64xl,-svade,-svadu,-svbare,-svinval,-svnapot,-svpbmt,-v,-xcvalu,-xcvbi,-xcvbitmanip,-xcvelw,-xcvmac,-xcvmem,-xcvsimd,-xesppie,-xsfcease,-xsfvcp,-xsfvfnrclipxfqf,-xsfvfwmaccqqq,-xsfvqmaccdod,-xsfvqmaccqoq,-xsifivecdiscarddlone,-xsifivecflushdlone,-xtheadba,-xtheadbb,-xtheadbs,-xtheadcmo,-xtheadcondmov,-xtheadfmemidx,-xtheadmac,-xtheadmemidx,-xtheadmempair,-xtheadsync,-xtheadvdot,-xventanacondops,-xwchc,-za128rs,-za64rs,-zaamo,-zabha,-zalrsc,-zama16b,-zawrs,-zba,-zbb,-zbc,-zbkb,-zbkc,-zbkx,-zbs,-zca,-zcb,-zcd,-zce,-zcf,-zcmop,-zcmp,-zcmt,-zdinx,-zfa,-zfbfmin,-zfh,-zfhmin,-zfinx,-zhinx,-zhinxmin,-zic64b,-zicbom,-zicbop,-zicboz,-ziccamoa,-ziccif,-zicclsm,-ziccrse,-zicntr,-zicond,-zicsr,-zifencei,-zihintntl,-zihintpause,-zihpm,-zimop,-zk,-zkn,-zknd,-zkne,-zknh,-zkr,-zks,-zksed,-zksh,-zkt,-ztso,-zvbb,-zvbc,-zve32f,-zve32x,-zve64d,-zve64f,-zve64x,-zvfbfmin,-zvfbfwma,-zvfh,-zvfhmin,-zvkb,-zvkg,-zvkn,-zvknc,-zvkned,-zvkng,-zvknha,-zvknhb,-zvks,-zvksc,-zvksed,-zvksg,-zvksh,-zvkt,-zvl1024b,-zvl128b,-zvl16384b,-zvl2048b,-zvl256b,-zvl32768b,-zvl32b,-zvl4096b,-zvl512b,-zvl64b,-zvl65536b,-zvl8192b",
"build-tags": [
"esp32c3",
"esp"
],
"serial": "usb",
"rtlib": "compiler-rt",
"libc": "newlib-esp32",
"linkerscript": "targets/esp32c3.memory.ld",
"extra-files": [
"targets/device/esp/esp32c3.c"
],
"binary-format": "esp32c3",
"flash-command": "esptool.py --chip=esp32c3 --port {port} write_flash 0x0 {bin}",
"serial-port": [
"303a:1001"
],
"openocd-interface": "esp_usb_jtag",
"openocd-target": "esp32c3",
"openocd-commands": [
"gdb_memory_map disable"
],
"gdb": [
"riscv32-esp-elf-gdb"
]
}
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