// Kill SSR after elapsed period less than SSR_PERIOD 

    if(ticks - last_ssr_on > ssr_output || ssr_output == 0)

    {

        GPIO_ResetBits(LED_STAT);

        GPIO_ResetBits(SSR_PIN);

    }

}

void draw_setpoint() {

    char tempstr[3];

    itoa_fp(temp, temp_frac, tempstr);

    ssd1306_DrawStringBig(tempstr, 3, 0);

    ssd1306_DrawStringBig(">", 3, 74);

    itoa(setpoint, tempstr);

    ssd1306_DrawStringBig("    ", 3, 90);

    ssd1306_DrawStringBig(tempstr, 3, 90);

}

uint8_t goto_mode = 2;

// State machine

uint8_t sw_btn_last = 0;

uint8_t sw_up_last = 0;