add at32 to README.rst, rename at32 board to lower case, correct name to match mcu, add meta data

hw/bsp/at32f415/boards/at_start_f415/board.cmake

@@ -0,0 +1,11 @@
+set(MCU_VARIANT AT32F415RCT7)
+set(MCU_LINKER_NAME AT32F415xC)
+
+set(JLINK_DEVICE ${MCU_VARIANT})
+
+function(update_board TARGET)
+  target_compile_definitions(${TARGET} PUBLIC
+    ${MCU_VARIANT}
+    CFG_EXAMPLE_VIDEO_READONLY
+    )
+endfunction()

hw/bsp/at32f415/boards/at_start_f415/board.h

@@ -0,0 +1,85 @@
+/*
+ * 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.
+ */
+
+/* metadata:
+   name: AT-START-F415
+   url: https://www.arterychip.com/en/product/AT32F415.jsp
+*/
+
+#ifndef BOARD_H_
+#define BOARD_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+#define USB_VBUS_IGNORE
+
+// LED
+#define LED_PORT              GPIOC
+#define LED_PIN               GPIO_PINS_2
+#define LED_STATE_ON          0 // Active Low
+#define LED_GPIO_CLK_EN()     crm_periph_clock_enable(CRM_GPIOC_PERIPH_CLOCK, TRUE)
+
+// Button
+#define BUTTON_PORT           GPIOA
+#define BUTTON_PIN            GPIO_PINS_0
+#define BUTTON_STATE_ACTIVE   0
+#define BUTTON_GPIO_CLK_EN()  crm_periph_clock_enable(CRM_GPIOA_PERIPH_CLOCK, TRUE)
+
+// Usart
+#define PRINT_UART                       USART1
+#define PRINT_UART_CRM_CLK               CRM_USART1_PERIPH_CLOCK
+#define PRINT_UART_TX_PIN                GPIO_PINS_9
+#define PRINT_UART_TX_GPIO               GPIOA
+#define PRINT_UART_TX_GPIO_CRM_CLK       CRM_GPIOA_PERIPH_CLOCK
+
+//USB
+#define USB_ID                           0
+#define OTG_CLOCK                        CRM_OTGFS1_PERIPH_CLOCK
+#define OTG_IRQ                          OTGFS1_IRQn
+#define OTG_IRQ_HANDLER                  OTGFS1_IRQHandler
+#define OTG_WKUP_IRQ                     OTGFS1_WKUP_IRQn
+#define OTG_WKUP_HANDLER                 OTGFS1_WKUP_IRQHandler
+#define OTG_WKUP_EXINT_LINE              EXINT_LINE_18
+#define OTG_PIN_GPIO                     GPIOA
+#define OTG_PIN_GPIO_CLOCK               CRM_GPIOA_PERIPH_CLOCK
+#define OTG_PIN_VBUS                     GPIO_PINS_9
+#define OTG_PIN_ID                       GPIO_PINS_10
+#define OTG_PIN_SOF_GPIO                 GPIOA
+#define OTG_PIN_SOF_GPIO_CLOCK           CRM_GPIOA_PERIPH_CLOCK
+#define OTG_PIN_SOF                      GPIO_PINS_8
+
+static inline void board_vbus_sense_init(void)
+{
+    *(int*)(0x50000038) |= (1<<21);
+}
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* BOARD_H_ */

hw/bsp/at32f415/boards/at_start_f415/board.mk

@@ -0,0 +1,8 @@
+MCU_VARIANT = AT32F415RCT7
+MCU_LINKER_NAME = AT32F415xC
+
+JLINK_DEVICE = ${MCU_VARIANT}
+
+CFLAGS += \
+  -D${MCU_VARIANT} \
+  -DCFG_EXAMPLE_VIDEO_READONLY