diff --git a/esp32/mods/pybdac.c b/esp32/mods/pybdac.c
index ee664d0330..7f454b57b0 100644
--- a/esp32/mods/pybdac.c
+++ b/esp32/mods/pybdac.c
@@ -176,10 +176,16 @@ STATIC mp_obj_t dac_tone(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_a
tone+=125;
pyb_dac_obj[0].tone_step = (tone *(1<<16)) / 8000000 - 1;
- }
- else {
+ } else {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "DAC tone frequency out of range"));
}
+ uint16_t tone_scale = args[1].u_int;
+ if (tone_scale >= 0 && tone_scale <= 3) {
+ self->tone_scale = tone_scale;
+
+ } else {
+ nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "DAC tone scale out of range"));
+ }
self->tone = true;
self->dc_value = 0;
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