diff options
Diffstat (limited to 'libopencm3/lib/stm32/common/flash_common_f234.c')
-rw-r--r-- | libopencm3/lib/stm32/common/flash_common_f234.c | 121 |
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); +} +/**@}*/ + |