Enable HCI UART mode on boot if SS is LOW

arduino/cores/esp32/wiring_digital.c

@@ -42,3 +42,8 @@ void digitalWrite(uint32_t pin, uint32_t val)
 {
   gpio_set_level((gpio_num_t)pin, val);
 }
+
+int digitalRead(uint32_t pin)
+{
+  return gpio_get_level(pin);
+}

arduino/cores/esp32/wiring_digital.h

@@ -36,6 +36,8 @@ extern void pinMode(uint32_t pin, uint32_t mode);
 
 extern void digitalWrite(uint32_t pin, uint32_t val);
 
+extern int digitalRead(uint32_t pin);
+
 #ifdef __cplusplus
 }
 #endif

main/sketch.ino.cpp

@@ -21,6 +21,8 @@
 
 extern "C" {
   #include <driver/periph_ctrl.h>
+  #include <driver/uart.h>
+  #include <esp_bt.h>
 }
 
 #include <Arduino.h>
@@ -77,6 +79,9 @@ void setDebug(int d) {
   }
 }
 
+void setupWiFi();
+void setupBluetooth();
+
 void setup() {
   setDebug(debug);
 
@@ -84,6 +89,47 @@ void setup() {
   pinMode(15, INPUT);
   pinMode(21, INPUT);
 
+  pinMode(5, INPUT);
+  if (digitalRead(5) == LOW) {
+    setupBluetooth();
+  } else {
+    setupWiFi();
+  }
+}
+
+// #define UNO_WIFI_REV2
+
+void setupBluetooth() {
+  periph_module_enable(PERIPH_UART1_MODULE);
+  periph_module_enable(PERIPH_UHCI0_MODULE);
+
+#ifdef UNO_WIFI_REV2
+  uart_set_pin(UART_NUM_1, 1, 3, 33, 0); // TX, RX, RTS, CTS
+#else
+  uart_set_pin(UART_NUM_1, 23, 12, 18, 5);
+#endif
+  uart_set_hw_flow_ctrl(UART_NUM_1, UART_HW_FLOWCTRL_CTS_RTS, 5);
+
+  esp_bt_controller_config_t btControllerConfig = BT_CONTROLLER_INIT_CONFIG_DEFAULT(); 
+
+  btControllerConfig.hci_uart_no = UART_NUM_1;
+#ifdef UNO_WIFI_REV2
+  btControllerConfig.hci_uart_baudrate = 115200;
+#else
+  btControllerConfig.hci_uart_baudrate = 912600;
+#endif
+
+  esp_bt_controller_init(&btControllerConfig);
+  while (esp_bt_controller_get_status() == ESP_BT_CONTROLLER_STATUS_IDLE);
+  esp_bt_controller_enable(ESP_BT_MODE_BLE);
+  esp_bt_sleep_enable();
+
+  while (1) {
+    vTaskDelay(portMAX_DELAY);
+  }
+}
+
+void setupWiFi() {
   SPIS.begin();
 
   if (WiFi.status() == WL_NO_SHIELD) {

sdkconfig

@@ -119,9 +119,26 @@ CONFIG_AWS_IOT_SDK=
 #
 # Bluetooth
 #
-CONFIG_BT_ENABLED=
+CONFIG_BT_ENABLED=y
+CONFIG_BTDM_CONTROLLER_PINNED_TO_CORE_0=y
+CONFIG_BTDM_CONTROLLER_PINNED_TO_CORE_1=
 CONFIG_BTDM_CONTROLLER_PINNED_TO_CORE=0
-CONFIG_BT_RESERVE_DRAM=0
+CONFIG_BTDM_CONTROLLER_HCI_MODE_VHCI=
+CONFIG_BTDM_CONTROLLER_HCI_MODE_UART_H4=y
+
+#
+# HCI UART(H4) Options
+#
+CONFIG_BT_HCI_UART_NO=1
+CONFIG_BT_HCI_UART_BAUDRATE=115200
+
+#
+# MODEM SLEEP Options
+#
+CONFIG_BTDM_CONTROLLER_MODEM_SLEEP=y
+CONFIG_BTDM_MODEM_SLEEP_MODE_ORIG=
+CONFIG_BTDM_MODEM_SLEEP_MODE_EVED=y
+CONFIG_BT_RESERVE_DRAM=0x10000
 
 #
 # Driver configurations
@@ -213,7 +230,6 @@ CONFIG_ESP32_XTAL_FREQ_26=
 CONFIG_ESP32_XTAL_FREQ_AUTO=
 CONFIG_ESP32_XTAL_FREQ=40
 CONFIG_DISABLE_BASIC_ROM_CONSOLE=
-CONFIG_NO_BLOBS=
 CONFIG_ESP_TIMER_PROFILING=
 CONFIG_COMPATIBLE_PRE_V2_1_BOOTLOADERS=
 CONFIG_ESP_ERR_TO_NAME_LOOKUP=y
@@ -221,6 +237,7 @@ CONFIG_ESP_ERR_TO_NAME_LOOKUP=y
 #
 # Wi-Fi
 #
+CONFIG_SW_COEXIST_ENABLE=
 CONFIG_ESP32_WIFI_STATIC_RX_BUFFER_NUM=10
 CONFIG_ESP32_WIFI_DYNAMIC_RX_BUFFER_NUM=32
 CONFIG_ESP32_WIFI_STATIC_TX_BUFFER=