diff --git a/py/gc.c b/py/gc.c
index 70b071ebc8a58..73e2436655785 100644
--- a/py/gc.c
+++ b/py/gc.c
@@ -187,6 +187,22 @@ void gc_collect_end(void) {
     gc_sweep();
 }
 
+extern void gc_helper_get_regs_and_clean_stack(machine_uint_t *regs, machine_uint_t heap_end);
+
+void gc_collect(void) {
+    extern char _ram_start;  /* defined by linker script */
+    extern char _ram_end;    /* defined by linker script */
+    extern char _heap_start; /* defined by linker script */
+    extern char _heap_end;   /* defined by linker script */
+
+    gc_collect_start();
+    gc_collect_root((void**)&_ram_start, (&_heap_start - &_ram_start) / 4);
+    machine_uint_t regs[10];
+    gc_helper_get_regs_and_clean_stack(regs, (uint32_t) &_heap_end);
+    gc_collect_root((void**)&_heap_end, (&_ram_end - &_heap_end) / 4); // will trace regs since they now live in this function on the stack
+    gc_collect_end();
+}
+
 void gc_info(gc_info_t *info) {
     info->total = (gc_pool_end - gc_pool_start) * sizeof(machine_uint_t);
     info->used = 0;
diff --git a/stm/Makefile b/stm/Makefile
index ab691095830af..497fffa996e08 100644
--- a/stm/Makefile
+++ b/stm/Makefile
@@ -65,6 +65,7 @@ SRC_C = \
 	usrsw.c \
 	adc.c \
 	rtc.c \
+	file.c \
 #	pybwlan.c \
 
 SRC_S = \
diff --git a/stm/file.c b/stm/file.c
new file mode 100644
index 0000000000000..35bfca16a5151
--- /dev/null
+++ b/stm/file.c
@@ -0,0 +1,94 @@
+#include <stdio.h>
+#include <stm32f4xx.h>
+
+#include "misc.h"
+#include "mpconfig.h"
+#include "mpconfigport.h"
+#include "qstr.h"
+#include "obj.h"
+#include "file.h"
+#include "ff.h"
+
+typedef struct _pyb_file_obj_t {
+    mp_obj_base_t base;
+    FIL fp;
+} pyb_file_obj_t;
+
+void file_obj_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in, mp_print_kind_t kind) {
+    printf("<file %p>", self_in);
+}
+
+mp_obj_t file_obj_read(mp_obj_t self_in, mp_obj_t arg) {
+    pyb_file_obj_t *self = self_in;
+    int n = mp_obj_get_int(arg);
+    byte *buf = m_new(byte, n);
+    UINT n_out;
+    f_read(&self->fp, buf, n, &n_out);
+    return mp_obj_new_str(buf, n_out, false);
+}
+
+mp_obj_t file_obj_write(mp_obj_t self_in, mp_obj_t arg) {
+    pyb_file_obj_t *self = self_in;
+    uint l;
+    const byte *s = mp_obj_str_get_data(arg, &l);
+    UINT n_out;
+    FRESULT res = f_write(&self->fp, s, l, &n_out);
+    if (res != FR_OK) {
+        printf("File error: could not write to file; error code %d\n", res);
+    } else if (n_out != l) {
+        printf("File error: could not write all data to file; wrote %d / %d bytes\n", n_out, l);
+    }
+    return mp_const_none;
+}
+
+mp_obj_t file_obj_close(mp_obj_t self_in) {
+    pyb_file_obj_t *self = self_in;
+    f_close(&self->fp);
+    return mp_const_none;
+}
+
+static MP_DEFINE_CONST_FUN_OBJ_2(file_obj_read_obj, file_obj_read);
+static MP_DEFINE_CONST_FUN_OBJ_2(file_obj_write_obj, file_obj_write);
+static MP_DEFINE_CONST_FUN_OBJ_1(file_obj_close_obj, file_obj_close);
+
+// TODO gc hook to close the file if not already closed
+
+static const mp_method_t file_methods[] = {
+    { "read", &file_obj_read_obj },
+    { "write", &file_obj_write_obj },
+    { "close", &file_obj_close_obj },
+    {NULL, NULL},
+};
+
+static const mp_obj_type_t file_obj_type = {
+    { &mp_const_type },
+    "File",
+    .print = file_obj_print,
+    .methods = file_methods,
+};
+
+mp_obj_t pyb_io_open(mp_obj_t o_filename, mp_obj_t o_mode) {
+    const char *filename = mp_obj_str_get_str(o_filename);
+    const char *mode = mp_obj_str_get_str(o_mode);
+    pyb_file_obj_t *self = m_new_obj(pyb_file_obj_t);
+    self->base.type = &file_obj_type;
+    if (mode[0] == 'r') {
+        // open for reading
+        FRESULT res = f_open(&self->fp, filename, FA_READ);
+        if (res != FR_OK) {
+            printf("FileNotFoundError: [Errno 2] No such file or directory: '%s'\n", filename);
+            return mp_const_none;
+        }
+    } else if (mode[0] == 'w') {
+        // open for writing, truncate the file first
+        FRESULT res = f_open(&self->fp, filename, FA_WRITE | FA_CREATE_ALWAYS);
+        if (res != FR_OK) {
+            printf("?FileError: could not create file: '%s'\n", filename);
+            return mp_const_none;
+        }
+    } else {
+        printf("ValueError: invalid mode: '%s'\n", mode);
+        return mp_const_none;
+    }
+    return self;
+}
diff --git a/stm/file.h b/stm/file.h
new file mode 100644
index 0000000000000..3845635deba16
--- /dev/null
+++ b/stm/file.h
@@ -0,0 +1 @@
+mp_obj_t pyb_io_open(mp_obj_t o_filename, mp_obj_t o_mode);
diff --git a/stm/main.c b/stm/main.c
index 92c3772d5f3ce..389fea26340c7 100644
--- a/stm/main.c
+++ b/stm/main.c
@@ -43,10 +43,12 @@
 #include "usrsw.h"
 #include "adc.h"
 #include "rtc.h"
+#include "file.h"
 
 int errno;
 
 extern uint32_t _heap_start;
+extern uint32_t _heap_end;
 
 static FATFS fatfs0;
 
@@ -454,21 +456,12 @@ bool do_file(const char *filename) {
     }
 }
 
-#define RAM_START (0x20000000) // fixed for chip
-#define HEAP_END  (0x2001c000) // tunable
-#define RAM_END   (0x20020000) // fixed for chip
-
-void gc_helper_get_regs_and_clean_stack(machine_uint_t *regs, machine_uint_t heap_end);
+mp_obj_t pyb_gc(void) {
+    uint32_t start,ticks;
 
-void gc_collect(void) {
-    uint32_t start = sys_tick_counter;
-    gc_collect_start();
-    gc_collect_root((void**)RAM_START, (((uint32_t)&_heap_start) - RAM_START) / 4);
-    machine_uint_t regs[10];
-    gc_helper_get_regs_and_clean_stack(regs, HEAP_END);
-    gc_collect_root((void**)HEAP_END, (RAM_END - HEAP_END) / 4); // will trace regs since they now live in this function on the stack
-    gc_collect_end();
-    uint32_t ticks = sys_tick_counter - start; // TODO implement a function that does this properly
+    start = sys_tick_counter;
+    gc_collect();
+    ticks = sys_tick_counter - start; // TODO implement a function that does this properly
 
     if (0) {
         // print GC info
@@ -479,10 +472,7 @@ void gc_collect(void) {
         printf(" %lu : %lu\n", info.used, info.free);
         printf(" 1=%lu 2=%lu m=%lu\n", info.num_1block, info.num_2block, info.max_block);
     }
-}
 
-mp_obj_t pyb_gc(void) {
-    gc_collect();
     return mp_const_none;
 }
 
@@ -544,90 +534,6 @@ mp_obj_t pyb_hid_send_report(mp_obj_t arg) {
     return mp_const_none;
 }
 
-typedef struct _pyb_file_obj_t {
-    mp_obj_base_t base;
-    FIL fp;
-} pyb_file_obj_t;
-
-void file_obj_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in, mp_print_kind_t kind) {
-    printf("<file %p>", self_in);
-}
-
-mp_obj_t file_obj_read(mp_obj_t self_in, mp_obj_t arg) {
-    pyb_file_obj_t *self = self_in;
-    int n = mp_obj_get_int(arg);
-    byte *buf = m_new(byte, n);
-    UINT n_out;
-    f_read(&self->fp, buf, n, &n_out);
-    return mp_obj_new_str(buf, n_out, false);
-}
-
-mp_obj_t file_obj_write(mp_obj_t self_in, mp_obj_t arg) {
-    pyb_file_obj_t *self = self_in;
-    uint l;
-    const byte *s = mp_obj_str_get_data(arg, &l);
-    UINT n_out;
-    FRESULT res = f_write(&self->fp, s, l, &n_out);
-    if (res != FR_OK) {
-        printf("File error: could not write to file; error code %d\n", res);
-    } else if (n_out != l) {
-        printf("File error: could not write all data to file; wrote %d / %d bytes\n", n_out, l);
-    }
-    return mp_const_none;
-}
-
-mp_obj_t file_obj_close(mp_obj_t self_in) {
-    pyb_file_obj_t *self = self_in;
-    f_close(&self->fp);
-    return mp_const_none;
-}
-
-static MP_DEFINE_CONST_FUN_OBJ_2(file_obj_read_obj, file_obj_read);
-static MP_DEFINE_CONST_FUN_OBJ_2(file_obj_write_obj, file_obj_write);
-static MP_DEFINE_CONST_FUN_OBJ_1(file_obj_close_obj, file_obj_close);
-
-// TODO gc hook to close the file if not already closed
-
-static const mp_method_t file_methods[] = {
-    { "read", &file_obj_read_obj },
-    { "write", &file_obj_write_obj },
-    { "close", &file_obj_close_obj },
-    {NULL, NULL},
-};
-
-static const mp_obj_type_t file_obj_type = {
-    { &mp_const_type },
-    "File",
-    .print = file_obj_print,
-    .methods = file_methods,
-};
-
-mp_obj_t pyb_io_open(mp_obj_t o_filename, mp_obj_t o_mode) {
-    const char *filename = mp_obj_str_get_str(o_filename);
-    const char *mode = mp_obj_str_get_str(o_mode);
-    pyb_file_obj_t *self = m_new_obj(pyb_file_obj_t);
-    self->base.type = &file_obj_type;
-    if (mode[0] == 'r') {
-        // open for reading
-        FRESULT res = f_open(&self->fp, filename, FA_READ);
-        if (res != FR_OK) {
-            printf("FileNotFoundError: [Errno 2] No such file or directory: '%s'\n", filename);
-            return mp_const_none;
-        }
-    } else if (mode[0] == 'w') {
-        // open for writing, truncate the file first
-        FRESULT res = f_open(&self->fp, filename, FA_WRITE | FA_CREATE_ALWAYS);
-        if (res != FR_OK) {
-            printf("?FileError: could not create file: '%s'\n", filename);
-            return mp_const_none;
-        }
-    } else {
-        printf("ValueError: invalid mode: '%s'\n", mode);
-        return mp_const_none;
-    }
-    return self;
-}
-
 mp_obj_t pyb_rng_get(void) {
     return mp_obj_new_int(RNG_GetRandomNumber() >> 16);
 }
@@ -692,7 +598,7 @@ int main(void) {
 soft_reset:
 
     // GC init
-    gc_init(&_heap_start, (void*)HEAP_END);
+    gc_init(&_heap_start, &_heap_end);
 
     // Micro Python init
     qstr_init();
diff --git a/stm/stm32f405.ld b/stm/stm32f405.ld
index c19e6a1c1947b..231dbcbe7099c 100644
--- a/stm/stm32f405.ld
+++ b/stm/stm32f405.ld
@@ -19,6 +19,10 @@ _minimum_heap_size = 16K;
 /* top end of the stack */
 _estack = ORIGIN(RAM) + LENGTH(RAM);
 
+_ram_start = 0x20000000;
+_ram_end   = 0x20020000;
+_heap_end  = 0x2001c000;
+
 /* define output sections */
 SECTIONS
 {

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