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-rw-r--r--flashstub/stm32f4.c40
1 files changed, 40 insertions, 0 deletions
diff --git a/flashstub/stm32f4.c b/flashstub/stm32f4.c
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+++ b/flashstub/stm32f4.c
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+/*
+ * This file is part of the Black Magic Debug project.
+ *
+ * Copyright (C) 2015 Black Sphere Technologies Ltd.
+ * Written by Gareth McMullin <gareth@blacksphere.co.nz>
+ *
+ * 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/>.
+ */
+#include "libopencm3/stm32/flash.h"
+#include "stub.h"
+
+#define SR_ERROR_MASK 0xF2
+
+void __attribute__((naked))
+stm32f4_flash_write_stub(uint32_t *dest, uint32_t *src, uint32_t size)
+{
+ for (int i = 0; i < size; i += 4) {
+ FLASH_CR = FLASH_CR_PROGRAM_X32 | FLASH_CR_PG;
+ *dest++ = *src++;
+ while (FLASH_SR & FLASH_SR_BSY)
+ ;
+ }
+
+ if (FLASH_SR & SR_ERROR_MASK)
+ stub_exit(1);
+
+ stub_exit(0);
+}
+