1 files changed, 8 insertions, 2 deletions
diff --git a/esp8266/modpyb.c b/esp8266/modpyb.c
index 5d57317b73..f02de9e305 100644
--- a/esp8266/modpyb.c
+++ b/esp8266/modpyb.c
@@ -81,10 +81,16 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pyb_info_obj, 0, 1, pyb_info);
 STATIC mp_obj_t pyb_freq(mp_uint_t n_args, const mp_obj_t *args) {
     if (n_args == 0) {
         // get
-        return mp_obj_new_int(mp_hal_get_cpu_freq() * 1000000);
+        return mp_obj_new_int(system_get_cpu_freq() * 1000000);
     } else {
         // set
-        nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "can't change freq"));
+        mp_int_t freq = mp_obj_get_int(args[0]) / 1000000;
+        if (freq != 80 && freq != 160) {
+            nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError,
+                    "frequency can only be either 80Mhz or 160MHz"));
+        }
+        system_update_cpu_freq(freq);
+        return mp_const_none;
     }
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(pyb_freq_obj, 0, 1, pyb_freq);