Fix typo with sigmadelta.h #ifdef
@@ -81,6 +81,6 @@ esp_err_t sigmadelta_set_prescale(sigmadelta_channel_t channel, uint8_t prescale
*/
esp_err_t sigmadelta_set_pin(sigmadelta_channel_t channel, gpio_num_t gpio_num);
-#ifdef _cplusplus
+#ifdef __cplusplus
}
#endif
