aboutsummaryrefslogtreecommitdiff
path: root/lib/stm32/flash.c
diff options
context:
space:
mode:
Diffstat (limited to 'lib/stm32/flash.c')
-rw-r--r--lib/stm32/flash.c189
1 files changed, 189 insertions, 0 deletions
diff --git a/lib/stm32/flash.c b/lib/stm32/flash.c
new file mode 100644
index 0000000..085aed4
--- /dev/null
+++ b/lib/stm32/flash.c
@@ -0,0 +1,189 @@
+/*
+ * This file is part of the libopenstm32 project.
+ *
+ * Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
+ * Copyright (C) 2010 Mark Butler <mbutler@physics.otago.ac.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 <libopenstm32/flash.h>
+
+void flash_prefetch_buffer_enable(void)
+{
+ FLASH_ACR |= FLASH_PRFTBE;
+}
+
+void flash_prefetch_buffer_disable(void)
+{
+ FLASH_ACR &= ~FLASH_PRFTBE;
+}
+
+void flash_halfcycle_enable(void)
+{
+ FLASH_ACR |= FLASH_HLFCYA;
+}
+
+void flash_halfcycle_disable(void)
+{
+ FLASH_ACR &= ~FLASH_HLFCYA;
+}
+
+void flash_set_ws(u32 ws)
+{
+ u32 reg32;
+
+ reg32 = FLASH_ACR;
+ reg32 &= ~((1 << 0) | (1 << 1) | (1 << 2));
+ reg32 |= ws;
+ FLASH_ACR = reg32;
+}
+
+void flash_unlock(void)
+{
+ /* Authorize the FPEC access. */
+ FLASH_KEYR = FLASH_KEY1;
+ FLASH_KEYR = FLASH_KEY2;
+}
+
+void flash_lock(void)
+{
+ FLASH_CR |= FLASH_LOCK;
+}
+
+void flash_clear_pgerr_flag(void)
+{
+ FLASH_SR |= FLASH_PGERR;
+}
+
+void flash_clear_eop_flag(void)
+{
+ FLASH_SR |= FLASH_EOP;
+}
+
+void flash_clear_wrprterr_flag(void)
+{
+ FLASH_SR |= FLASH_WRPRTERR;
+}
+
+void flash_clear_bsy_flag(void)
+{
+ FLASH_SR &= ~FLASH_BSY;
+}
+
+void flash_clear_status_flags(void)
+{
+ flash_clear_pgerr_flag();
+ flash_clear_eop_flag();
+ flash_clear_wrprterr_flag();
+ flash_clear_bsy_flag();
+}
+
+void flash_unlock_option_bytes(void)
+{
+ FLASH_OPTKEYR = FLASH_KEY1;
+ FLASH_OPTKEYR = FLASH_KEY2;
+}
+
+void flash_wait_for_last_operation(void)
+{
+ while ((FLASH_SR & FLASH_BSY) == FLASH_BSY)
+ ;
+}
+
+void flash_program_word(u32 address, u32 data)
+{
+ /* Ensure that all flash operations are complete. */
+ flash_wait_for_last_operation();
+
+ /* Enable writes to flash. */
+ FLASH_CR |= FLASH_PG;
+
+ /* Program the first half of the word. */
+ (*(volatile u16 *)address) = (u16)data;
+
+ /* Wait for the write to complete. */
+ flash_wait_for_last_operation();
+
+ /* Program the second half of the word. */
+ (*(volatile u16 *)(address + 2)) = data >> 16;
+
+ /* Wait for the write to complete. */
+ flash_wait_for_last_operation();
+
+ /* Disable writes to flash. */
+ FLASH_CR &= ~FLASH_PG;
+}
+
+void flash_program_half_word(u32 address, u16 data)
+{
+ flash_wait_for_last_operation();
+
+ FLASH_CR |= FLASH_PG;
+
+ (*(volatile u16 *)address) = data;
+
+ flash_wait_for_last_operation();
+
+ FLASH_CR &= ~FLASH_PG; /* Disable the PG bit. */
+}
+
+void flash_erase_page(u32 page_address)
+{
+ flash_wait_for_last_operation();
+
+ FLASH_CR |= FLASH_PER;
+ FLASH_AR = page_address;
+ FLASH_CR |= FLASH_STRT;
+
+ flash_wait_for_last_operation();
+ FLASH_CR &= ~FLASH_PER;
+}
+
+void flash_erase_all_pages(void)
+{
+ flash_wait_for_last_operation();
+
+ FLASH_CR |= FLASH_MER; /* Enable mass erase. */
+ FLASH_CR |= FLASH_STRT; /* Trigger the erase. */
+
+ flash_wait_for_last_operation();
+ FLASH_CR &= ~FLASH_MER; /* Disable mass erase. */
+}
+
+void flash_erase_option_bytes(void)
+{
+ flash_wait_for_last_operation();
+
+ if ((FLASH_CR & FLASH_OPTWRE) == 0)
+ flash_unlock_option_bytes();
+
+ FLASH_CR |= FLASH_OPTER; /* Enable option byte erase. */
+ FLASH_CR |= FLASH_STRT;
+ flash_wait_for_last_operation();
+ FLASH_CR &= ~FLASH_OPTER; /* Disable option byte erase. */
+}
+
+void flash_program_option_bytes(u32 address, u16 data)
+{
+ flash_wait_for_last_operation();
+
+ if ((FLASH_CR & FLASH_OPTWRE) == 0)
+ flash_unlock_option_bytes();
+
+ FLASH_CR |= FLASH_OPTPG; /* Enable option byte programming. */
+ (*(volatile u16 *)address) = data;
+ flash_wait_for_last_operation();
+ FLASH_CR &= ~FLASH_OPTPG; /* Disable option byte programming. */
+}