1 files changed, 121 insertions, 0 deletions
diff --git a/libopencm3/lib/stm32/common/flash_common_f234.c b/libopencm3/lib/stm32/common/flash_common_f234.c
new file mode 100644
index 0000000..1d99566
--- /dev/null
+++ b/libopencm3/lib/stm32/common/flash_common_f234.c
@@ -0,0 +1,121 @@
+/** @addtogroup flash_file
+ *
+ */
+
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
+ * Copyright (C) 2010 Mark Butler <mbutler@physics.otago.ac.nz>
+ *
+ * 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/stm32/flash.h>
+
+/*---------------------------------------------------------------------------*/
+/** @brief Set the Number of Wait States
+
+Used to match the system clock to the FLASH memory access time. See the
+programming manual for more information on clock speed ranges. The latency must
+be changed to the appropriate value <b>before</b> any increase in clock
+speed, or <b>after</b> any decrease in clock speed.
+
+@param[in] uint32_t ws: values from @ref flash_latency.
+*/
+
+void flash_set_ws(uint32_t ws)
+{
+	uint32_t reg32;
+
+	reg32 = FLASH_ACR;
+	reg32 &= ~((1 << 0) | (1 << 1) | (1 << 2));
+	reg32 |= ws;
+	FLASH_ACR = reg32;
+}
+
+/*---------------------------------------------------------------------------*/
+/** @brief Unlock the Flash Program and Erase Controller
+
+This enables write access to the Flash memory. It is locked by default on
+reset.
+*/
+
+void flash_unlock(void)
+{
+	/* Clear the unlock sequence state. */
+	FLASH_CR |= FLASH_CR_LOCK;
+
+	/* Authorize the FPEC access. */
+	FLASH_KEYR = FLASH_KEYR_KEY1;
+	FLASH_KEYR = FLASH_KEYR_KEY2;
+}
+
+/*---------------------------------------------------------------------------*/
+/** @brief Lock the Flash Program and Erase Controller
+
+Used to prevent spurious writes to FLASH.
+*/
+
+void flash_lock(void)
+{
+	FLASH_CR |= FLASH_CR_LOCK;
+}
+
+/*---------------------------------------------------------------------------*/
+/** @brief Clear the Programming Error Status Flag
+
+*/
+
+void flash_clear_pgperr_flag(void)
+{
+	FLASH_SR |= FLASH_SR_PGPERR;
+}
+
+/*---------------------------------------------------------------------------*/
+/** @brief Clear the End of Operation Status Flag
+
+*/
+
+void flash_clear_eop_flag(void)
+{
+	FLASH_SR |= FLASH_SR_EOP;
+}
+
+/*---------------------------------------------------------------------------*/
+/** @brief Clear the Busy Status Flag
+
+*/
+
+void flash_clear_bsy_flag(void)
+{
+	FLASH_SR &= ~FLASH_SR_BSY;
+}
+
+
+/*---------------------------------------------------------------------------*/
+/** @brief Wait until Last Operation has Ended
+
+This loops indefinitely until an operation (write or erase) has completed by
+testing the busy flag.
+*/
+
+void flash_wait_for_last_operation(void)
+{
+	while ((FLASH_SR & FLASH_SR_BSY) == FLASH_SR_BSY);
+}
+/**@}*/
+