Support ESP32-C3

[stintel]

Support ESP32-C3

The ESP32-C3 is a RISC-V based ESP. It would be nice if esphome supported this.

ESP32-C3-DevKitM-1 can be ordered from e.g. Mouser. Estimated shipping date for mine is 17/05. I'm willing to donate 1 or 2 if needed.

[markusg1234]

Got mine yesterday and have it working in Arduino IDE using https://github.com/espressif/arduino-esp32#master
Would be great if it can be added to ESPHome.

Thankyou.

[misery]

@stintel I created a PR (esphome/esphome#1433) to support my ESP32-S2 for 1.18.0. https://github.com/espressif/arduino-esp32/releases/tag/2.0.0-alpha1 supports both now. So maybe it should work, too.

Could you try this? Does it work?
You need to use current dev branch: https://github.com/esphome/esphome

esphome:
  name: esp32c3demo
  platform: ESP32
  board: nodemcu-32s
  platformio_options:
    board_build.mcu: esp32c3
    platform_packages: framework-arduinoespressif32 @ https://github.com/espressif/arduino-esp32.git#master

esphome your_c3.yaml compile

I don't have a C3 yet. So please post the compile errors here. :-)

[stintel]

I don't have a C3 yet. So please post the compile errors here. :-)

Still waiting for mine, and the estimated shipment date changed today:
* We will contact you as soon as we obtain an estimated shipment date from the manufacturer.

But thanks in advance, and I'll definitely try it out once I get my C3s.

[markusg1234]

Hi, I tried your suggestion and got the following with an error of failed. Running Esphome v1.19.0-dev.

INFO Reading configuration /config/esphome/esp32-c.yaml...
INFO Generating C++ source...
INFO Compiling app...
INFO Running: platformio run -d /config/esphome/esp32-c
Processing esp32-c (board: nodemcu-32s; framework: arduino; platform: platformio/espressif32@3.2.0)

Platform Manager: Installing platformio/espressif32 @ 3.2.0
Downloading [####################################] 100%
Unpacking [####################################] 100%
Platform Manager: espressif32 @ 3.2.0 has been installed!
The platform 'platformio/espressif32@3.2.0' has been successfully installed!
The rest of the packages will be installed later depending on your build environment.
Tool Manager: Installing git+https://github.com/espressif/arduino-esp32.git#master
git version 2.20.1
Cloning into '/root/.platformio/.cache/tmp/pkg-installing-n4ztzhc9'...
Checking out files: 100% (6176/6176), done.
Tool Manager: framework-arduinoespressif32 @ 0.0.0+sha.7856de7 has been installed!
HARDWARE: ESP32C3 240MHz, 320KB RAM, 4MB Flash
PACKAGES:

• framework-arduinoespressif32 0.0.0+sha.7856de7
• tool-esptoolpy 1.30000.201119 (3.0.0)
• toolchain-xtensa32 2.50200.97 (5.2.0)
  Library Manager: Installing Hash
  Library Manager: Already installed, built-in library
  Dependency Graph
  |-- 1.2.2
  |-- 1.0
  |-- 1.2.7
  | |-- 1.2.2
  | |-- 1.0
  | |-- 1.0
  |-- 1.0
  | |-- 1.0
  |-- 1.1.0
  | |-- 1.0
  |-- 1.0
  |-- 1.0
  Compiling /data/esp32-c/.pioenvs/esp32-c/src/esphome/components/api/api_connection.cpp.o
  sh: 1: xtensa-esp32c3-elf-g++: not found
  Compiling /data/esp32-c/.pioenvs/esp32-c/src/esphome/components/api/api_pb2.cpp.o
  sh: 1: xtensa-esp32c3-elf-g++: not found
  Compiling /data/esp32-c/.pioenvs/esp32-c/src/esphome/components/api/api_pb2_service.cpp.o
  sh: 1: xtensa-esp32c3-elf-g++: not found
  *** [/data/esp32-c/.pioenvs/esp32-c/src/esphome/components/api/api_connection.cpp.o] Error 127
  Compiling /data/esp32-c/.pioenvs/esp32-c/src/esphome/components/api/api_server.cpp.o
  *** [/data/esp32-c/.pioenvs/esp32-c/src/esphome/components/api/api_pb2.cpp.o] Error 127
  *** [/data/esp32-c/.pioenvs/esp32-c/src/esphome/components/api/api_pb2_service.cpp.o] Error 127
  sh: 1: xtensa-esp32c3-elf-g++: not found
  *** [/data/esp32-c/.pioenvs/esp32-c/src/esphome/components/api/api_server.cpp.o] Error 127
  ========================= [FAILED] Took 74.62 seconds =========================

[misery]

Hi, thanks.... I tried to compile it myself now.

Found in platformio/platform-espressif32#497 that someone added the toolchain for it.

  platform: ESP32
  board: nodemcu-32s
  platformio_options:
    board_build.mcu: esp32c3
    platform: https://github.com/Jason2866/platform-espressif32.git#feature/arduino-c3
    platform_packages: framework-arduinoespressif32 @ https://github.com/espressif/arduino-esp32.git#master

I have some compile errors now. I will look into it later.
Initial error fixed: esphome/esphome#1798

[misery]

Fixed some compile errors. Please check if this helps to run a simple test. I dont' have any C3 here to execute the binary.

ESPAsyncWebServer

• captive_portal
• web_server
• Fix compiler error for ESP32-C3 and mbed TLS v2.7.0+ me-no-dev/ESPAsyncWebServer#970

.piolibdeps/esp_demo_c3/ESPAsyncWebServer-esphome/src/AsyncWebSocket.cpp: In member function 'IPAddress AsyncWebSocketClient::remoteIP()':
.piolibdeps/esp_demo_c3/ESPAsyncWebServer-esphome/src/AsyncWebSocket.cpp:840:28: error: call of overloaded 'IPAddress(unsigned int)' is ambiguous
         return IPAddress(0U);
                            ^
In file included from /home/andre/.platformio/packages/framework-arduinoespressif32@src-cba3def1496a47e6af73c0b73bd2e13c/cores/esp32/Arduino.h:153,
                 from .piolibdeps/esp_demo_c3/ESPAsyncWebServer-esphome/src/AsyncWebSocket.cpp:21:
/home/andre/.platformio/packages/framework-arduinoespressif32@src-cba3def1496a47e6af73c0b73bd2e13c/cores/esp32/IPAddress.h:51:5: note: candidate: 'IPAddress::IPAddress(const uint8_t*)'
     IPAddress(const uint8_t *address);
     ^~~~~~~~~
/home/andre/.platformio/packages/framework-arduinoespressif32@src-cba3def1496a47e6af73c0b73bd2e13c/cores/esp32/IPAddress.h:50:5: note: candidate: 'IPAddress::IPAddress(uint32_t)'
     IPAddress(uint32_t address);
     ^~~~~~~~~
/home/andre/.platformio/packages/framework-arduinoespressif32@src-cba3def1496a47e6af73c0b73bd2e13c/cores/esp32/IPAddress.h:29:7: note: candidate: 'constexpr IPAddress::IPAddress(const IPAddress&)'
 class IPAddress: public Printable

Can be fixed like this until it is merged.

esphome:
  name: esp_c3
  platform: ESP32
  board: nodemcu-32s
  platformio_options:
    board_build.mcu: esp32c3
    lib_deps: https://github.com/khoih-prog/ESPAsyncWebServer
    platform: https://github.com/Jason2866/platform-espressif32.git#feature/arduino-c3
    platform_packages: framework-arduinoespressif32 @ https://github.com/espressif/arduino-esp32.git#master

Another TODO with GPIO usage:

/home/andre/.platformio/packages/toolchain-riscv32/bin/../lib/gcc/riscv32-esp-elf/8.4.0/../../../../riscv32-esp-elf/bin/ld: .pioenvs/esp_demo_c3/libFrameworkArduino.a(wiring_pulse.c.o): in function `pulseIn':
/home/andre/.platformio/packages/framework-arduinoespressif32@src-cba3def1496a47e6af73c0b73bd2e13c/cores/esp32/wiring_pulse.c:38: undefined reference to `xthal_get_ccount'
/home/andre/.platformio/packages/toolchain-riscv32/bin/../lib/gcc/riscv32-esp-elf/8.4.0/../../../../riscv32-esp-elf/bin/ld: /home/andre/.platformio/packages/framework-arduinoespressif32@src-cba3def1496a47e6af73c0b73bd2e13c/cores/esp32/wiring_pulse.c:40: undefined reference to `xthal_get_ccount'
/home/andre/.platformio/packages/toolchain-riscv32/bin/../lib/gcc/riscv32-esp-elf/8.4.0/../../../../riscv32-esp-elf/bin/ld: /home/andre/.platformio/packages/framework-arduinoespressif32@src-cba3def1496a47e6af73c0b73bd2e13c/cores/esp32/wiring_pulse.c:45: undefined reference to `xthal_get_ccount'
/home/andre/.platformio/packages/toolchain-riscv32/bin/../lib/gcc/riscv32-esp-elf/8.4.0/../../../../riscv32-esp-elf/bin/ld: /home/andre/.platformio/packages/framework-arduinoespressif32@src-cba3def1496a47e6af73c0b73bd2e13c/cores/esp32/wiring_pulse.c:41: undefined reference to `xthal_get_ccount'
/home/andre/.platformio/packages/toolchain-riscv32/bin/../lib/gcc/riscv32-esp-elf/8.4.0/../../../../riscv32-esp-elf/bin/ld: /home/andre/.platformio/packages/framework-arduinoespressif32@src-cba3def1496a47e6af73c0b73bd2e13c/cores/esp32/wiring_pulse.c:42: undefined reference to `xthal_get_ccount'
/home/andre/.platformio/packages/toolchain-riscv32/bin/../lib/gcc/riscv32-esp-elf/8.4.0/../../../../riscv32-esp-elf/bin/ld: .pioenvs/esp_demo_c3/libFrameworkArduino.a(wiring_pulse.c.o):/home/andre/.platformio/packages/framework-arduinoespressif32@src-cba3def1496a47e6af73c0b73bd2e13c/cores/esp32/wiring_pulse.c:43: more undefined references to `xthal_get_ccount' follow

[markusg1234]

Hi,
How do you install the tool chain?

Regards,
Markus

Tool Manager: Installing toolchain-riscv32 @ ~1.80400.0
Error: Could not find the package with 'toolchain-riscv32 @ ~1.80400.0' requirements for your system 'linux_aarch64'

[misery]

It will be installed automatically. Seems linux_aarch64 is not supported at the moment. I used Linux x86_64 here.

[nikhiljha]

tried this out (my esp32c-c3 arrived today) with this config and got a whole bunch of errors like this

src/esphome/core/esphal.cpp:200:10: error: 'gpio_dev_t' {aka 'volatile struct<unnamed>'} has no member named 'status1_w1tc'; did you mean 'status_w1tc'?
     GPIO.status1_w1tc.intr_st = this->gpio_mask_;
          ^~~~~~~~~~~~
          status_w1tc
src/esphome/core/esphal.cpp: In constructor 'esphome::GPIOPin::GPIOPin(uint8_t, uint8_t, bool)':
src/esphome/core/esphal.cpp:32:55: error: 'gpio_dev_t' {aka 'volatile struct<unnamed>'} has no member named 'out1_w1ts'; did you mean 'out_w1ts'?
           gpio_set_(pin < 32 ? &GPIO.out_w1ts : &GPIO.out1_w1ts.val),
                                                       ^~~~~~~~~
                                                       out_w1ts
src/esphome/core/esphal.cpp:33:53: error: 'gpio_dev_t' {aka 'volatile struct<unnamed>'} has no member named 'out1_w1tc'; did you mean 'out_w1tc'?
       gpio_clear_(pin < 32 ? &GPIO.out_w1tc : &GPIO.out1_w1tc.val),
                                                     ^~~~~~~~~
                                                     out_w1tc

did you manage to get a binary?

[misery]

See my referenced pull requests. This should fix this. But maybe leads to a linker error at the moment.

Yes, I have a simple binary. But no C3 to test it.

[stintel]

@misery I was able to build a binary after applying your PRs. Unfortunately I'm unable to flash it, as esphome-flasher also doesn't support C3 yet. I'm working on adding support here: https://github.com/stintel/esphome-flasher/tree/esp32c3.

[stintel]

Flashed firmware.bin with esptool at the offset of the ota_0 partition, now getting an error about unable to set CPU clock:

[20:52:04]ESP-ROM:esp32c3-api1-20210207
[20:52:04]Build:Feb  7 2021
[20:52:04]rst:0x1 (POWERON),boot:0xc (SPI_FAST_FLASH_BOOT)
[20:52:04]SPIWP:0xee
[20:52:04]mode:DIO, clock div:1
[20:52:04]load:0x3fcd6100,len:0x17a8
[20:52:04]load:0x403ce000,len:0x894
[20:52:04]load:0x403d0000,len:0x2bf8
[20:52:04]entry 0x403ce000
[20:52:04]I (52) boot: ESP-IDF v4.3-beta2-2-g9a2d251912 2nd stage bootloader
[20:52:04]I (52) boot: compile time 19:26:26
[20:52:04]I (52) boot: chip revision: 3
[20:52:04]I (56) boot_comm: chip revision: 3, min. bootloader chip revision: 0
[20:52:04]I (63) boot.esp32c3: SPI Speed      : 80MHz
[20:52:04]I (67) boot.esp32c3: SPI Mode       : DIO
[20:52:04]I (72) boot.esp32c3: SPI Flash Size : 4MB
[20:52:04]I (77) boot: Enabling RNG early entropy source...
[20:52:04]I (82) boot: Partition Table:
[20:52:04]I (86) boot: ## Label            Usage          Type ST Offset   Length
[20:52:04]I (93) boot:  0 sec_cert         unknown          3f 00 0000d000 00003000
[20:52:04]I (101) boot:  1 nvs              WiFi data        01 02 00010000 00006000
[20:52:04]I (108) boot:  2 otadata          OTA data         01 00 00016000 00002000
[20:52:04]I (116) boot:  3 phy_init         RF data          01 01 00018000 00001000
[20:52:04]I (123) boot:  4 ota_0            OTA app          00 10 00020000 00190000
[20:52:04]I (131) boot:  5 ota_1            OTA app          00 11 001b0000 00190000
[20:52:04]I (138) boot:  6 fctry            WiFi data        01 02 00340000 00006000
[20:52:04]I (146) boot:  7 coredump         Unknown data     01 03 00350000 00010000
[20:52:04]I (154) boot: End of partition table
[20:52:04]I (158) boot_comm: chip revision: 3, min. application chip revision: 0
[20:52:04]I (165) esp_image: segment 0: paddr=00020020 vaddr=3c030020 size=0cc90h ( 52368) map
[20:52:04]I (182) esp_image: segment 1: paddr=0002ccb8 vaddr=3fc8a000 size=014d8h (  5336) load
[20:52:04]I (183) esp_image: segment 2: paddr=0002e198 vaddr=40380000 size=01e80h (  7808) load
[20:52:04]I (192) esp_image: segment 3: paddr=00030020 vaddr=42000020 size=23370h (144240) map
[20:52:05]I (221) esp_image: segment 4: paddr=00053398 vaddr=40381e80 size=08000h ( 32768) load
[20:52:05]I (228) esp_image: segment 5: paddr=0005b3a0 vaddr=50000000 size=00010h (    16) load
[20:52:05]I (231) boot: Loaded app from partition at offset 0x20000
[20:52:05]I (233) boot: Disabling RNG early entropy source...
[20:52:05][   257][E][esp32-hal-cpu.c:204] setCpuFrequencyMhz(): CPU clock could not be set to 240 MHz

[misery]

Try to change 240 MHz to 160 MHz. C3 has 160 MHz only.