diff --git a/ports/atmel-samd/common-hal/pulseio/PWMOut.c b/ports/atmel-samd/common-hal/pulseio/PWMOut.c
index dd85e8c02d..6dcace21fd 100644
--- a/ports/atmel-samd/common-hal/pulseio/PWMOut.c
+++ b/ports/atmel-samd/common-hal/pulseio/PWMOut.c
@@ -102,6 +102,8 @@ void pwmout_reset(void) {
         }
         tcc_channels[i] = mask;
         tccs[i]->CTRLA.bit.SWRST = 1;
+        while (tccs[i]->CTRLA.bit.SWRST == 1) {
+        }
     }
     Tc *tcs[TC_INST_NUM] = TC_INSTS;
     for (int i = 0; i < TC_INST_NUM; i++) {
diff --git a/shared-bindings/pulseio/PWMOut.c b/shared-bindings/pulseio/PWMOut.c
index bba5fe8835..37939a07ab 100644
--- a/shared-bindings/pulseio/PWMOut.c
+++ b/shared-bindings/pulseio/PWMOut.c
@@ -103,7 +103,7 @@ STATIC mp_obj_t pulseio_pwmout_make_new(const mp_obj_type_t *type, size_t n_args
 
     uint16_t duty_cycle = parsed_args[ARG_duty_cycle].u_int;
     uint32_t frequency = parsed_args[ARG_frequency].u_int;
-    bool variable_frequency = parsed_args[ARG_variable_frequency].u_int;
+    bool variable_frequency = parsed_args[ARG_variable_frequency].u_bool;
 
     // create PWM object from the given pin
     pulseio_pwmout_obj_t *self = m_new_obj(pulseio_pwmout_obj_t);