diff --git a/third_party/mfrc522_integration/CMakeLists.txt b/third_party/mfrc522_integration/CMakeLists.txt
index ea03f7c..1d4d1e2 100644
--- a/third_party/mfrc522_integration/CMakeLists.txt
+++ b/third_party/mfrc522_integration/CMakeLists.txt
@@ -10,9 +10,7 @@ target_link_libraries(mfrc522
     pico_stdlib
     pico_time
     hardware_gpio
-    hardware_i2c
     hardware_spi
-    hardware_uart
 )
 
 target_include_directories(mfrc522 PUBLIC ${SRC})
diff --git a/third_party/mfrc522_integration/mfrc522_rp2040_integration.c b/third_party/mfrc522_integration/mfrc522_rp2040_integration.c
index 4db9fc2..3fc5947 100644
--- a/third_party/mfrc522_integration/mfrc522_rp2040_integration.c
+++ b/third_party/mfrc522_integration/mfrc522_rp2040_integration.c
@@ -35,7 +35,8 @@
  */
 
 #include <stdio.h>
-#include <pico/stdlib.h>
+#include "pico/stdlib.h"
+#include "hardware/spi.h"
 
 #ifndef NO_DEBUG
 #include <stdarg.h>
@@ -95,6 +96,7 @@ uint8_t mfrc522_interface_reset_gpio_write(uint8_t value)
  */
 uint8_t mfrc522_interface_iic_init(void)
 {
+    mfrc522_interface_debug_print("WARN: %s not implemented!\n", __FUNCTION__);
     return 0;
 }
 
@@ -107,6 +109,7 @@ uint8_t mfrc522_interface_iic_init(void)
  */
 uint8_t mfrc522_interface_iic_deinit(void)
 {
+    mfrc522_interface_debug_print("WARN: %s not implemented!\n", __FUNCTION__);
     return 0;
 }
 
@@ -123,6 +126,7 @@ uint8_t mfrc522_interface_iic_deinit(void)
  */
 uint8_t mfrc522_interface_iic_read(uint8_t addr, uint8_t reg, uint8_t *buf, uint16_t len)
 {
+    mfrc522_interface_debug_print("WARN: %s not implemented!\n", __FUNCTION__);
     return 0;
 }
 
@@ -139,6 +143,7 @@ uint8_t mfrc522_interface_iic_read(uint8_t addr, uint8_t reg, uint8_t *buf, uint
  */
 uint8_t mfrc522_interface_iic_write(uint8_t addr, uint8_t reg, uint8_t *buf, uint16_t len)
 {
+    mfrc522_interface_debug_print("WARN: %s not implemented!\n", __FUNCTION__);
     return 0;
 }
 
@@ -205,6 +210,7 @@ uint8_t mfrc522_interface_spi_write(uint8_t reg, uint8_t *buf, uint16_t len)
  */
 uint8_t mfrc522_interface_uart_init(void)
 {
+    mfrc522_interface_debug_print("WARN: %s not implemented!\n", __FUNCTION__);
     return 0;
 }
 
@@ -217,6 +223,7 @@ uint8_t mfrc522_interface_uart_init(void)
  */
 uint8_t mfrc522_interface_uart_deinit(void)
 {
+    mfrc522_interface_debug_print("WARN: %s not implemented!\n", __FUNCTION__);
     return 0;
 }
 
@@ -231,6 +238,7 @@ uint8_t mfrc522_interface_uart_deinit(void)
  */
 uint16_t mfrc522_interface_uart_read(uint8_t *buf, uint16_t len)
 {
+    mfrc522_interface_debug_print("WARN: %s not implemented!\n", __FUNCTION__);
     return 0;
 }
 
@@ -245,6 +253,7 @@ uint16_t mfrc522_interface_uart_read(uint8_t *buf, uint16_t len)
  */
 uint8_t mfrc522_interface_uart_write(uint8_t *buf, uint16_t len)
 {
+    mfrc522_interface_debug_print("WARN: %s not implemented!\n", __FUNCTION__);
     return 0;
 }
 
@@ -257,6 +266,7 @@ uint8_t mfrc522_interface_uart_write(uint8_t *buf, uint16_t len)
  */
 uint8_t mfrc522_interface_uart_flush(void)
 {
+    mfrc522_interface_debug_print("WARN: %s not implemented!\n", __FUNCTION__);
     return 0;
 }