add devkit c3 board

Author: hathach

hw/bsp/espressif/boards/espressif_c3_devkitc/board.cmake

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+# Apply board specific content here
+set(IDF_TARGET "esp32c3")

hw/bsp/espressif/boards/espressif_c3_devkitc/board.h

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+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020, Ha Thach (tinyusb.org)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+#define NEOPIXEL_PIN          8
+
+#define BUTTON_PIN            9
+#define BUTTON_STATE_ACTIVE   0
+
+// SPI for USB host shield
+#define MAX3421_SPI_HOST SPI2_HOST
+#define MAX3421_SCK_PIN  4
+#define MAX3421_MOSI_PIN 6
+#define MAX3421_MISO_PIN 5
+#define MAX3421_CS_PIN   10
+#define MAX3421_INTR_PIN 7
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* BOARD_H_ */