Add a new target for the GigaDevice variant of the BluePill Plus.

WeAct ships two variants of this board, one with an STM32F103 and
another with a GD32F303 series chip. The two boards are otherwise
identical.

The GD32F303 series is pin-compatible and register compatible with the
STM32F103, but features a cortex M4, more ram, and more flash.

In this case, the chip included has 48k of RAM and 256k of flash.

The biggest difference is that flash pages are 2k and not 1k.

While it's a little bit gross to be compiling code targeting the Cortex
M3 on an ST chip and using it on an M4 made by somebody else, this was
exactly the use case envisioned by GigaDevice.

I've tested this bootloader on actual hardware and additionally
validated that WebDFU works from
https://devanlai.github.io/webdfu/dfu-util/ to it.

The LED does *not* light up in the bootloader and I haven't dug into
that, although the pin definition is correctly targeting PB2.

Author: obra

src/stm32f103/bluepillplus-gd32/config.h

@@ -0,0 +1,81 @@
+/*
+ * Copyright (c) 2016, Devan Lai
+ *
+ * Permission to use, copy, modify, and/or distribute this software
+ * for any purpose with or without fee is hereby granted, provided
+ * that the above copyright notice and this permission notice
+ * appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
+ * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
+ * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+ * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
+ * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef CONFIG_H_INCLUDED
+#define CONFIG_H_INCLUDED
+
+#ifndef APP_BASE_ADDRESS
+#define APP_BASE_ADDRESS (0x08000000 + BOOTLOADER_OFFSET)
+#endif
+#ifndef FLASH_SIZE_OVERRIDE
+#define FLASH_SIZE_OVERRIDE 0x20000
+#endif
+#ifndef FLASH_PAGE_SIZE
+#define FLASH_PAGE_SIZE 2048
+#endif
+#ifndef DFU_UPLOAD_AVAILABLE
+#define DFU_UPLOAD_AVAILABLE 1
+#endif
+#ifndef DFU_DOWNLOAD_AVAILABLE
+#define DFU_DOWNLOAD_AVAILABLE 1
+#endif
+
+#ifndef HAVE_LED
+#define HAVE_LED 1
+#endif
+#ifndef LED_OPEN_DRAIN
+#define LED_OPEN_DRAIN 0
+#endif
+#ifndef LED_GPIO_PORT
+#define LED_GPIO_PORT GPIOB
+#endif
+#ifndef LED_GPIO_PIN
+#define LED_GPIO_PIN GPIO2
+#endif
+
+#ifndef HAVE_BUTTON
+#define HAVE_BUTTON 1
+#endif
+#ifndef BUTTON_ACTIVE_HIGH
+#define BUTTON_ACTIVE_HIGH 1
+#endif
+#ifndef BUTTON_GPIO_PORT
+#define BUTTON_GPIO_PORT GPIOA
+#endif
+#ifndef BUTTON_GPIO_PIN
+#define BUTTON_GPIO_PIN GPIO0
+#endif
+#ifndef BUTTON_USES_PULL
+#define BUTTON_USES_PULL 1
+#endif
+#ifndef BUTTON_SAMPLE_DELAY_CYCLES
+#define BUTTON_SAMPLE_DELAY_CYCLES 1440000
+#endif
+
+#ifndef HAVE_USB_PULLUP_CONTROL
+#define HAVE_USB_PULLUP_CONTROL 0
+#endif
+
+#ifndef USES_GPIOA
+#define USES_GPIOA 1
+#endif
+#ifndef USES_GPIOB
+#define USES_GPIOB 1
+#endif
+
+#endif

src/targets.mk

@@ -119,6 +119,12 @@ ifeq ($(TARGET),BLUEPILLPLUSSTM32_HIGH_128)
 	ARCH			= STM32F1
 	DEFS			+= -DBOOTLOADER_HIGH
 endif
+ifeq ($(TARGET),BLUEPILLPLUSGD32)
+	TARGET_COMMON_DIR	:= ./stm32f103
+	TARGET_SPEC_DIR		:= ./stm32f103/bluepillplus-gd32
+	LDSCRIPT		:= ./stm32f103/stm32f103x8.ld
+	ARCH			= STM32F1
+endif
 ifeq ($(TARGET),STM32L1_GENERIC)
 	TARGET_COMMON_DIR	:= ./stm32l1
 	TARGET_SPEC_DIR		:= ./stm32l1/generic