tests: gadget0: Created a platform/target for Black Magic Probe

tests/gadget-zero/Makefile.stm32f1-blackmagic

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+##
+## This file is part of the libopencm3 project.
+##
+## This library is free software: you can redistribute it and/or modify
+## it under the terms of the GNU Lesser General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+##
+## This library is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU Lesser General Public License for more details.
+##
+## You should have received a copy of the GNU Lesser General Public License
+## along with this library.  If not, see <http://www.gnu.org/licenses/>.
+##
+
+BOARD = stm32f1-blackmagic
+PROJECT = usb-gadget0-$(BOARD)
+BUILD_DIR = bin-$(BOARD)
+
+SHARED_DIR = ../shared
+
+CFILES = main-$(BOARD).c
+CFILES += usb-gadget0.c trace.c trace_stdio.c
+CFILES += delay.c
+
+VPATH += $(SHARED_DIR)
+
+INCLUDES += $(patsubst %,-I%, . $(SHARED_DIR))
+
+OPENCM3_DIR=../..
+OPENCM3_LIB=opencm3_stm32f1
+OPENCM3_DEFS=-DSTM32F1
+ARCH_FLAGS=-mcpu=cortex-m3 -mthumb
+LDSCRIPT=blackmagic.ld
+
+LDFLAGS += -Wl,-gc-sections -Wl,--print-memory-usage -Wl,-Ttext=0x8002000
+
+include ../rules.mk
+
+$(PROJECT).flash: $(PROJECT).elf
+	@echo "  FLASH	$<"
+	$(Q)dfu-util -d 1d50:6018,:6017 -s 0x08002000:leave -D $(realpath $(PROJECT).bin)

tests/gadget-zero/blackmagic.ld

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+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2022 Rachel Mant <git@dragonmux.network>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Define memory regions. */
+MEMORY
+{
+	rom (rx) : ORIGIN = 0x08000000, LENGTH = 128K
+	ram (rwx) : ORIGIN = 0x20000000, LENGTH = 20K
+}
+
+/* Include the common ld script from libopencm3. */
+INCLUDE cortex-m-generic.ld

tests/gadget-zero/main-stm32f1-blackmagic.c

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+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2022 Rachel Mant <git@dragonmux.network>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libopencm3/cm3/nvic.h>
+#include <libopencm3/cm3/scs.h>
+#include <libopencm3/cm3/scb.h>
+#include <libopencm3/stm32/gpio.h>
+#include <libopencm3/stm32/rcc.h>
+#include <libopencm3/stm32/exti.h>
+
+#include <stdio.h>
+#include <stdbool.h>
+#include "usb-gadget0.h"
+
+#define ER_DEBUG
+#ifdef ER_DEBUG
+#define ER_DPRINTF(fmt, ...) \
+	do { printf(fmt, ## __VA_ARGS__); } while (0)
+#else
+#define ER_DPRINTF(fmt, ...) \
+	do { } while (0)
+#endif
+
+#define LED_PORT GPIOB
+#define LED_0 GPIO2
+#define LED_1 GPIO10
+#define LED_2 GPIO11
+
+#define IRQ_PRI_USB_VBUS        (14 << 4)
+
+int main(void)
+{
+	rcc_periph_clock_enable(RCC_GPIOB);
+	/* LED to indicate boot process */
+	gpio_set_mode(LED_PORT, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, LED_0 | LED_1 | LED_2);
+	gpio_clear(LED_PORT, LED_0 | LED_2);
+	gpio_set(LED_PORT, LED_1);
+
+	rcc_clock_setup_pll(&rcc_hse_configs[RCC_CLOCK_HSE8_72MHZ]);
+
+	rcc_periph_clock_enable(RCC_USB);
+	rcc_periph_clock_enable(RCC_GPIOA);
+
+	/* Configure USB pull-up control */
+	gpio_clear(GPIOA, GPIO8);
+	gpio_set_mode(GPIOA, GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, GPIO8);
+
+	/* Make sure we don't accidentally enable the BMP target power */
+	gpio_set(GPIOB, GPIO1);
+	gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_OPENDRAIN, GPIO1);
+
+	usbd_device *usbd_dev = gadget0_init(&st_usbfs_v1_usb_driver, "stm32f1-blackmagic");
+
+	gpio_set(GPIOA, GPIO8);
+	gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO8);
+
+	ER_DPRINTF("bootup complete\n");
+	gpio_clear(LED_PORT, LED_1);
+	gpio_set(LED_PORT, LED_0);
+
+	while (true) {
+		gadget0_run(usbd_dev);
+	}
+}