m4_init/3rd/libopencm3/lib/stm32/g0/flash.c

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2023-02-02 16:50:31 +00:00
/** @defgroup flash_file FLASH peripheral API
*
* @ingroup peripheral_apis
*
* @brief <b>libopencm3 STM32G0xx FLASH</b>
*
* @version 1.0.0
*
* LGPL License Terms @ref lgpl_license
*/
/*
* 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/>.
*/
/**@{*/
#include <libopencm3/stm32/flash.h>
/** @brief Wait until Last Flash Operation has Ended */
void flash_wait_for_last_operation(void)
{
while ((FLASH_SR & FLASH_SR_BSY) == FLASH_SR_BSY);
}
/** @brief Program a 64bits word to FLASH
*
* Program a 64bit word to FLASH memory.
* Flash programing error must be checked and cleared if needed
* before starting programming.
*
* @param[in] address Address in FLASH
* @param[in] data Double word to write
*/
void flash_program_double_word(uint32_t address, uint64_t data)
{
flash_wait_for_last_operation();
FLASH_CR |= FLASH_CR_PG;
MMIO32(address) = (uint32_t)data;
MMIO32(address+4) = (uint32_t)(data >> 32);
flash_wait_for_last_operation();
FLASH_CR &= ~FLASH_CR_PG;
}
/** @brief Program a Data Block to FLASH
*
* This programs an arbitrary length data block to FLASH memory.
* The program error flag should be checked separately for the event that memory
* was not properly erased.
*
* @param[in] address Starting address in Flash.
* @param[in] data Pointer to start of data block.
* @param[in] len Length of data block in bytes (multiple of 8).
**/
void flash_program(uint32_t address, uint8_t *data, uint32_t len)
{
for (uint32_t i = 0; i < len; i += 8) {
flash_program_double_word(address+i, *(uint64_t*)(data + i));
}
}
/** @brief Erase a page of FLASH
* @param[in] page
*/
void flash_erase_page(uint32_t page)
{
flash_wait_for_last_operation();
uint32_t reg = FLASH_CR;
reg &= ~(FLASH_CR_PNB_MASK << FLASH_CR_PNB_SHIFT);
reg |= (page & FLASH_CR_PNB_MASK) << FLASH_CR_PNB_SHIFT;
reg |= FLASH_CR_PER;
reg |= FLASH_CR_STRT;
FLASH_CR = reg;
flash_wait_for_last_operation();
FLASH_CR &= ~FLASH_CR_PER;
}
/** @brief Erase All FLASH
* This performs all operations necessary to erase all sectors in the FLASH
* memory.
*/
void flash_erase_all_pages(void)
{
flash_wait_for_last_operation();
FLASH_CR |= FLASH_CR_MER;
FLASH_CR |= FLASH_CR_STRT;
flash_wait_for_last_operation();
FLASH_CR &= ~FLASH_CR_MER;
}
/** @brief Clear the Programming Sequence Error Flag */
void flash_clear_pgserr_flag(void)
{
FLASH_SR |= FLASH_SR_PGSERR;
}
/** @brief Clear the End of Operation Flag */
void flash_clear_eop_flag(void)
{
FLASH_SR |= FLASH_SR_EOP;
}
/** @brief Clear programming size error flag */
void flash_clear_size_flag(void)
{
FLASH_SR |= FLASH_SR_SIZERR;
}
/** @brief Clear the Programming Alignment Error Flag
*/
void flash_clear_pgaerr_flag(void)
{
FLASH_SR |= FLASH_SR_PGAERR;
}
/** @brief Clear the Write Protected Error Flag
*/
void flash_clear_wrperr_flag(void)
{
FLASH_SR |= FLASH_SR_WRPERR;
}
/** @brief Clear the Programming Error Status Flag
*/
void flash_clear_progerr_flag(void)
{
FLASH_SR |= FLASH_SR_PROGERR;
}
/** @brief Clear the Operation Error Status Flag
*/
void flash_clear_operr_flag(void)
{
FLASH_SR |= FLASH_SR_OPERR;
}
/** @brief Clear All Status Flags */
void flash_clear_status_flags(void)
{
flash_clear_pgserr_flag();
flash_clear_size_flag();
flash_clear_pgaerr_flag();
flash_clear_wrperr_flag();
flash_clear_progerr_flag();
flash_clear_eop_flag();
flash_clear_operr_flag();
}
void flash_icache_enable(void)
{
FLASH_ACR |= FLASH_ACR_ICEN;
}
void flash_icache_disable(void)
{
FLASH_ACR &= ~FLASH_ACR_ICEN;
}
void flash_icache_reset(void)
{
FLASH_ACR |= FLASH_ACR_ICRST;
}
void flash_unlock_progmem(void)
{
FLASH_KEYR = FLASH_KEYR_KEY1;
FLASH_KEYR = FLASH_KEYR_KEY2;
}
void flash_lock_progmem(void)
{
FLASH_CR |= FLASH_CR_LOCK;
}
void flash_lock_option_bytes(void)
{
FLASH_CR |= FLASH_CR_OPTLOCK;
}
void flash_unlock(void)
{
flash_unlock_progmem();
flash_unlock_option_bytes();
}
void flash_lock(void)
{
flash_lock_option_bytes();
flash_lock_progmem();
}
/**@}*/