Compile errors for ESP32-C3

[Jason2866]

Hi great work for supporting the C3!!

I encountered two errors from core when trying to compile project Tasmota for the C3
1st:
https://github.com/espressif/arduino-esp32/blob/master/tools/platformio-build-esp32c3.py#L74
it seems not supported from riscv32 gcc. Removing did solve
2nd:
https://github.com/espressif/arduino-esp32/blob/master/cores/esp32/Esp.h#L114
not working for C3

@me-no-dev can you take a look?

Thx Jason

[me-no-dev]

@Jason2866 I did not encounter any build errors. Flags are extracted from ESP-IDF's build. As for some things not working... yeah :) still in early alpha

[Jason2866]

Changing too

{
    uint32_t ccount;
    //__asm__ __volatile__("esync; rsr %0,ccount":"=a" (ccount));
    asm volatile ("rdcycle x1" : "=r" (ccount) );
    return ccount;
}

in Esp.h solved

[Jason2866]

First error is corrected with commit 5d9b98c

[lbernstone]

That change crashes my C3. Does systimer_hal_get_counter_value(SYSTIMER_COUNTER_0); from hal/systimer_hal.h give you the correct value? This should ultimately work for all the devices once the hal is functional.

[Jason2866]

Yes, you are right. Thx for your suggestion. Looks better now. Now crashes later ;-)
Btw. got it going to compile the ESP-C3 with Platformio. Did a homebrew setup to support the riscv toolchain.

[env:tasmota32c3]
extends                     = env:tasmota32_base
board                       = esp32c3
platform                    = https://github.com/Jason2866/platform-espressif32.git#feature/arduino-c3
platform_packages           = framework-arduinoespressif32 @ https://github.com/Jason2866/esp32-arduino-lib-builder/releases/download/v.2.0.0.pre/framework-arduinoespressif32-master-cf457d412.tar.gz
                              ; needed toolchain for Windows
                              toolchain-riscv32 @ https://github.com/Jason2866/platform-espressif32/releases/download/8.4.0/riscv32-esp-elf-gcc8_4_0-crosstool-ng-1.24.0-123-g64eb9ff-win32.zip
                              ; needed toolchain for Linux
                              ;toolchain-riscv32 @ https://github.com/Jason2866/platform-espressif32/releases/download/8.4.0/riscv32-esp-elf-gcc8_4_0-crosstool-ng-1.24.0-123-g64eb9ff-linux-amd64.tar.gz
                              ; needed toolchain for MacOS
                              ;toolchain-riscv32 @ https://github.com/Jason2866/platform-espressif32/releases/download/8.4.0/riscv32-esp-elf-gcc8_4_0-crosstool-ng-1.24.0-123-g64eb9ff-macos.tar.gz