Wire.h as esp-idf component

[HFRibeiro]

Hello,

It's possible to use the wire.h library using arduino-esp32 as a esp-idf component?

This is the error i get on make:

In file included from C:/esp32_projects/arduino/components/arduino/cores/esp32/Print.h:27:0, from C:/esp32_projects/arduino/components/arduino/cores/esp32/Stream.h:26, from C:/esp32_projects/arduino/components/arduino/libraries/Wire/src/Wire.h:30, from C:/esp32_projects/arduino/main/main.c:10: C:/esp32_projects/arduino/components/arduino/cores/esp32/Printable.h:25:1: error: unknown type name 'class' class Print; ^ C:/esp32_projects/arduino/components/arduino/cores/esp32/Printable.h:33:1: error: unknown type name 'class' class Printable ^ C:/esp32_projects/arduino/components/arduino/cores/esp32/Printable.h:34:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token { ^ In file included from C:/esp32_projects/arduino/components/arduino/cores/esp32/Stream.h:26:0, from C:/esp32_projects/arduino/components/arduino/libraries/Wire/src/Wire.h:30, from C:/esp32_projects/arduino/main/main.c:10: C:/esp32_projects/arduino/components/arduino/cores/esp32/Print.h:34:1: error: unknown type name 'class' class Print ^ C:/esp32_projects/arduino/components/arduino/cores/esp32/Print.h:35:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token { ^ In file included from C:/esp32_projects/arduino/components/arduino/libraries/Wire/src/Wire.h:30:0, from C:/esp32_projects/arduino/main/main.c:10: C:/esp32_projects/arduino/components/arduino/cores/esp32/Stream.h:38:1: error: unknown type name 'class' class Stream: public Print ^ C:/esp32_projects/arduino/components/arduino/cores/esp32/Stream.h:38:13: error: expected '=', ',', ';', 'asm' or '__attribute__' before ':' token class Stream: public Print ^ In file included from C:/esp32_projects/arduino/main/main.c:10:0: C:/esp32_projects/arduino/components/arduino/libraries/Wire/src/Wire.h:34:1: error: unknown type name 'class' class TwoWire: public Stream ^ C:/esp32_projects/arduino/components/arduino/libraries/Wire/src/Wire.h:34:14: error: expected '=', ',', ';', 'asm' or '__attribute__' before ':' token class TwoWire: public Stream ^ C:/esp32_projects/arduino/components/arduino/libraries/Wire/src/Wire.h:97:1: error: unknown type name 'TwoWire' extern TwoWire Wire; ^ make[1]: *** [/c/esp-idf/make/component_wrapper.mk:177: main.o] Error 1 make: *** [C:/esp-idf/make/project.mk:377: main-build] Error 2

My code:

`#include "freertos/FreeRTOS.h"
#include "esp_wifi.h"
#include "esp_system.h"
#include "esp_event.h"
#include "esp_event_loop.h"
#include "nvs_flash.h"
#include "driver/gpio.h"

#include "Arduino.h"
#include <Wire.h>

esp_err_t event_handler(void *ctx, system_event_t *event)
{
return ESP_OK;
}

void app_main(void)
{
nvs_flash_init();
tcpip_adapter_init();
initArduino();

ESP_ERROR_CHECK( esp_event_loop_init(event_handler, NULL) );
wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
ESP_ERROR_CHECK( esp_wifi_init(&cfg) );
ESP_ERROR_CHECK( esp_wifi_set_storage(WIFI_STORAGE_RAM) );
ESP_ERROR_CHECK( esp_wifi_set_mode(WIFI_MODE_STA) );
wifi_config_t sta_config = {
    .sta = {
        .ssid = "fluxodata",
        .password = "fluxodata01",
        .bssid_set = false
    }
};
ESP_ERROR_CHECK( esp_wifi_set_config(WIFI_IF_STA, &sta_config) );
ESP_ERROR_CHECK( esp_wifi_start() );
ESP_ERROR_CHECK( esp_wifi_connect() );


pinMode(13, OUTPUT);

int level = 0;
while (true) {
    digitalWrite(13, level);
    level = !level;
	printf("%d\n",level);
    vTaskDelay(500 / portTICK_PERIOD_MS);
}

}

`

[me-no-dev]

you are running this from C file and Arduino is C++ :) change to cpp and things will work (see readme)

[HFRibeiro]

I totally miss that.

Thank you very much

[HFRibeiro]

@me-no-dev do you know how to use external libraries?
Putting them in \arduino\components\arduino\libraries does not seem to work...

[forthlightning]

The IDF doesnt look in your regular library folder.

If you check out the docs for build environment, you can add your library folder as a include directory. Gotta edit the project makefile!

[HFRibeiro]

Thanks for the info :)