XIAO Round Display Not Detecting SD Card

Products & Technology XIAO
41

Test.ino

#include <lvgl.h>

// uncomment a library for display driver
#define USE_TFT_ESPI_LIBRARY
// #define USE_ARDUINO_GFX_LIBRARY

#include "lv_xiao_round_screen.h"
#include "lv_hardware_test.h"

void setup()
{
    Serial.begin( 115200 );  //prepare for possible serial debug 
    Serial.println( "XIAO round screen - LVGL_Arduino" );


    // Map SPI port to 'new' pins
#define SS 28
#define MOSI 3
#define MISO 4
#define SCK 2
Serial.println("--------------");
  Serial.println(SS);
  Serial.println(MOSI); // master out, slave in
  Serial.println(MISO); // master in, slave out
  Serial.println(SCK);  // clock
  Serial.println("--------------");

    lv_init();

    lv_xiao_disp_init();
    lv_xiao_touch_init();

    lv_hardware_test();
}

void loop()
{
    lv_timer_handler();  //let the GUI do its work 
    delay( 5 );
}

lv_hardware_test.h

#include <SD.h>

#define NUM_ADC_SAMPLE 20
#define RP2040_VREF 3300 // The actual voltage on 3V3 pin. (unit: mV)
static lv_obj_t *slider_label;

static void event_handler(lv_event_t * e)
{
    lv_event_code_t code = lv_event_get_code(e);
    lv_obj_t * obj = lv_event_get_target(e);
    if(code == LV_EVENT_VALUE_CHANGED) {
        LV_LOG_USER("State: %s\n", lv_obj_has_state(obj, LV_STATE_CHECKED) ? "On" : "Off");
    }
}

static void hardware_polled_cb(lv_timer_t * timer) {
    lv_obj_t *tf_state = (lv_obj_t *)timer->user_data;
    if(SD.begin(A1)){
      lv_obj_add_state(tf_state, LV_STATE_CHECKED);
      lv_obj_t * test_label = lv_label_create(lv_scr_act());
      lv_label_set_text(test_label, "Success");
      lv_obj_set_pos(test_label, 90, 110);
      delay(4000);
      SD.end();
    } else {
      lv_obj_clear_state(tf_state, LV_STATE_CHECKED); 

      lv_obj_t * test_label = lv_label_create(lv_scr_act());
      lv_label_set_text(test_label, "Failure");
      lv_obj_set_pos(test_label, 90, 110);
    }
}

void lv_hardware_test(void)
{
    lv_obj_t * tf_label = lv_label_create(lv_scr_act());
    lv_label_set_text(tf_label, "tf-card");
    lv_obj_set_pos(tf_label, 90, 130);

    lv_obj_t * tf_state = lv_switch_create(lv_scr_act());
    lv_obj_set_pos(tf_state, 90, 150);
    lv_obj_add_state(tf_state, LV_STATE_CHECKED | LV_STATE_DISABLED);
    lv_obj_add_event_cb(tf_state, event_handler, LV_EVENT_ALL, NULL);
    lv_timer_create(hardware_polled_cb, 7000, tf_state);

    analogReadResolution(12);
#if defined(ARDUINO_SEEED_XIAO_NRF52840_SENSE) || defined(ARDUINO_SEEED_XIAO_NRF52840)
    analogReference(AR_INTERNAL2V4); // 0.6V ref  1/4 Gain
#endif
}

I’m using a modified hardware test example, just using the SD card components, added a “success/failure” condition label.

The compiler output (verbose compile) doesn’t have much, pretty much just the libraries used and file locations.