refactor the adc driver

components/soc/esp32/adc_periph.c

@@ -0,0 +1,25 @@
+// Copyright 2015-2019 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/adc_periph.h"
+
+/* Store IO number corresponding to the ADC channel number. */
+const int adc_channel_io_map[SOC_ADC_PERIPH_NUM][SOC_ADC_MAX_CHANNEL_NUM] = {
+    /* ADC1 */
+    {ADC1_CHANNEL_0_GPIO_NUM, ADC1_CHANNEL_1_GPIO_NUM, ADC1_CHANNEL_2_GPIO_NUM, ADC1_CHANNEL_3_GPIO_NUM, ADC1_CHANNEL_4_GPIO_NUM,
+     ADC1_CHANNEL_5_GPIO_NUM, ADC1_CHANNEL_6_GPIO_NUM, ADC1_CHANNEL_7_GPIO_NUM, -1,                      -1},
+    /* ADC2 */
+    {ADC2_CHANNEL_0_GPIO_NUM, ADC2_CHANNEL_1_GPIO_NUM, ADC2_CHANNEL_2_GPIO_NUM, ADC2_CHANNEL_3_GPIO_NUM, ADC2_CHANNEL_4_GPIO_NUM,
+     ADC2_CHANNEL_5_GPIO_NUM, ADC2_CHANNEL_6_GPIO_NUM, ADC2_CHANNEL_7_GPIO_NUM, ADC2_CHANNEL_8_GPIO_NUM, ADC2_CHANNEL_9_GPIO_NUM}
+};