diff --git a/c_mpos/src/quirc_decode.c b/c_mpos/src/quirc_decode.c
index f2097eb2..159000b5 100644
--- a/c_mpos/src/quirc_decode.c
+++ b/c_mpos/src/quirc_decode.c
@@ -1,84 +1,116 @@
 #include "py/obj.h"
 #include "py/runtime.h"
 #include "py/mperrno.h"
-
 #include <string.h>
-
 #include "../quirc/lib/quirc.h"
 
 // Function to decode a QR code from a grayscale image buffer
 static mp_obj_t qrdecode(mp_uint_t n_args, const mp_obj_t *args) {
-    printf("qrdecode running\n")
+    printf("qrdecode: Starting\n");
+
     // Check argument count (expecting buffer, width, height)
+    printf("qrdecode: Checking argument count\n");
     if (n_args != 3) {
         mp_raise_ValueError(MP_ERROR_TEXT("quirc_decode expects 3 arguments: buffer, width, height"));
     }
 
     // Extract buffer
+    printf("qrdecode: Extracting buffer\n");
     mp_buffer_info_t bufinfo;
     mp_get_buffer_raise(args[0], &bufinfo, MP_BUFFER_READ);
+    printf("qrdecode: Buffer extracted, len=%zu\n", bufinfo.len);
 
     // Extract width and height
+    printf("qrdecode: Extracting width and height\n");
     mp_int_t width = mp_obj_get_int(args[1]);
     mp_int_t height = mp_obj_get_int(args[2]);
+    printf("qrdecode: Width=%ld, Height=%ld\n", width, height);
 
     // Validate dimensions
+    printf("qrdecode: Validating dimensions\n");
     if (width <= 0 || height <= 0) {
         mp_raise_ValueError(MP_ERROR_TEXT("width and height must be positive"));
     }
     if (bufinfo.len != (size_t)(width * height)) {
         mp_raise_ValueError(MP_ERROR_TEXT("buffer size must match width * height"));
     }
+    printf("qrdecode: Dimensions validated\n");
 
     // Initialize quirc
+    printf("qrdecode: Initializing quirc\n");
     struct quirc *qr = quirc_new();
     if (!qr) {
         mp_raise_OSError(MP_ENOMEM);
     }
+    printf("qrdecode: quirc initialized\n");
 
     // Resize quirc for the image dimensions
+    printf("qrdecode: Resizing quirc\n");
     if (quirc_resize(qr, width, height) < 0) {
         quirc_destroy(qr);
         mp_raise_OSError(MP_ENOMEM);
     }
+    printf("qrdecode: quirc resized\n");
 
     // Get quirc image buffer and copy grayscale data
+    printf("qrdecode: Beginning quirc processing\n");
     uint8_t *image;
     quirc_begin(qr, NULL, NULL);
     image = quirc_begin(qr, NULL, NULL); // Get pointer to quirc's image buffer
-    memcpy(image, bufinfo.buf, width * height); // Copy buffer directly (grayscale, 8-bit)
+    printf("qrdecode: quirc image buffer obtained\n");
+    printf("qrdecode: Copying buffer, size=%zu\n", (size_t)(width * height));
+    memcpy(image, bufinfo.buf, width * height);
+    printf("qrdecode: Buffer copied\n");
     quirc_end(qr);
+    printf("qrdecode: quirc processing ended\n");
 
     // Check for QR codes
+    printf("qrdecode: Counting QR codes\n");
     int count = quirc_count(qr);
+    printf("qrdecode: Found %d QR codes\n", count);
     if (count == 0) {
         quirc_destroy(qr);
         mp_raise_ValueError(MP_ERROR_TEXT("no QR code found"));
     }
 
     // Extract and decode the first QR code
+    printf("qrdecode: Extracting first QR code\n");
     struct quirc_code code;
-    struct quirc_data data;
-    quirc_extract(qr, 0, &code); // Extract first QR code
+    quirc_extract(qr, 0, &code);
+    printf("qrdecode: QR code extracted\n");
 
     // Decode the QR code
+    printf("qrdecode: Decoding QR code\n");
+    struct quirc_data data;
     int err = quirc_decode(&code, &data);
     if (err != QUIRC_SUCCESS) {
         quirc_destroy(qr);
         mp_raise_ValueError(MP_ERROR_TEXT("failed to decode QR code"));
     }
+    printf("qrdecode: QR code decoded, payload_len=%d\n", data.payload_len);
 
     // Convert decoded data to Python string
+    printf("qrdecode: Creating Python string\n");
     mp_obj_t result = mp_obj_new_str((const char *)data.payload, data.payload_len);
+    printf("qrdecode: Python string created\n");
 
     // Clean up
+    printf("qrdecode: Cleaning up\n");
     quirc_destroy(qr);
+    printf("qrdecode: quirc destroyed\n");
 
+    printf("qrdecode: Returning result\n");
     return result;
 }
 
+// Wrapper function to fix incompatible pointer type warning
+static mp_obj_t qrdecode_wrapper(size_t n_args, const mp_obj_t *args) {
+    printf("qrdecode_wrapper: Called with %zu args\n", n_args);
+    return qrdecode(n_args, args);
+}
+
 // Define the MicroPython function
-static MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(qrdecode_obj, 3, 3, qrdecode);
+static MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(qrdecode_obj, 3, 3, qrdecode_wrapper);
 
 // Module definition
 static const mp_rom_map_elem_t qrdecode_module_globals_table[] = {