First time building code esp-idf in VScode

[zazas321]

Hello. I have decided to move from Arduino platform to ESP-IDF. I have started with a hello world program and I have created my own .c and .h files the same way I do for my Arduino projetcts:

setup.c:

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#include "setup.h"




void setupModem()
{
#ifdef MODEM_RST
    // Keep reset high
    gpio_config_t modem_pwr_conf;
    modem_pwr_conf.intr_type = GPIO_PIN_INTR_DISABLE;
    modem_pwr_conf.mode = GPIO_MODE_OUTPUT;
    modem_pwr_conf.pin_bit_mask = (1 << MODEM_PWRKEY);
    gpio_set_level(GPIO_NUM_4, 1);
#endif

    gpio_config_t modem_rst_conf;
    modem_rst_conf.intr_type = GPIO_PIN_INTR_DISABLE;
    modem_rst_conf.mode = GPIO_MODE_OUTPUT;
    modem_rst_conf.pin_bit_mask = (1 << MODEM_RST);
    gpio_set_level(GPIO_NUM_5, 1);


    // Turn on the Modem power first


    // Pull down PWRKEY for more than 1 second according to manual requirements
    gpio_set_level(GPIO_NUM_4, 1);
    delay(100);
    gpio_set_level(GPIO_NUM_4, 0);
    delay(1000);
    gpio_set_level(GPIO_NUM_4, 1);

    // Initialize the indicator as an output
    gpio_config_t modem_led_conf;
    modem_led_conf.intr_type = GPIO_PIN_INTR_DISABLE;
    modem_led_conf.mode = GPIO_MODE_OUTPUT;
    modem_led_conf.pin_bit_mask = (1 << LED_GPIO);
    gpio_set_level(GPIO_NUM_13, 0);

}

setup.h

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#include "driver/gpio.h"
     

#define MODEM_RST            GPIO_SEL_5
#define MODEM_PWRKEY         GPIO_SEL_4
#define MODEM_POWER_ON       GPIO_SEL_23
#define MODEM_TX             GPIO_SEL_27
#define MODEM_RX             GPIO_SEL_26
#define LED_GPIO             GPIO_SEL_13
#define LED_ON               HIGH
#define LED_OFF              LOW

void setupModem();

My project structure is as following:
https://ibb.co/zrRjpWZ


I have 2 questions:

1.I am including this header file in my main.c but for some reason I am not able to call this function as it is not recognised, and the error returned:

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C:\Users\petrikas.lu\Documents\PlatformIO\Projects\210715-150937-espidf-hello-world/src/hello_world_main.c:19: undefined reference to `setupModem'

I have heard that I need to add the custom library to the cmakelists.txt but unsure how. Can someone clarify?

2. Once I clean the projects, it takes insanely long time to build the project. Why is that? I have expected esp-idf to be much faster than Arduino platform projects but it is about 10 times slower compile times. Compiling simple hello world program took 105 seconds :
https://ibb.co/G0xPzXj