dac: refactor driver add hal

components/soc/esp32/dac_periph.c

@@ -0,0 +1,23 @@
+// Copyright 2019 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "soc/dac_periph.h"
+
+/*
+ Bunch of constants for DAC peripheral: GPIO number
+*/
+const dac_signal_conn_t dac_periph_signal = {
+    .dac_channel_io_num[0] = DAC_CHANNEL_1_GPIO_NUM,
+    .dac_channel_io_num[1] = DAC_CHANNEL_2_GPIO_NUM,
+};