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stm32f3: flash: support basic write/erase operations

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Originally filed as https://github.com/libopencm3/libopencm3/pull/627
This commit is contained in:
Karl Palsson 2018-07-25 23:37:12 +00:00
parent 3293913be2
commit b8ede60d9d
2 changed files with 48 additions and 1 deletions
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3
include/libopencm3/stm32/f3/flash.h
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@ -99,6 +99,9 @@ BEGIN_DECLS
void flash_clear_pgerr_flag(void); void flash_clear_pgerr_flag(void);
void flash_clear_wrprterr_flag(void); void flash_clear_wrprterr_flag(void);
void flash_program_half_word(uint32_t address, uint16_t data);
void flash_erase_page(uint32_t page_address);
void flash_erase_all_pages(void);
END_DECLS END_DECLS

46
lib/stm32/f3/flash.c
View File

@ -46,6 +46,11 @@
#include <libopencm3/stm32/flash.h> #include <libopencm3/stm32/flash.h>
void flash_wait_for_last_operation(void)
{
while ((FLASH_SR & FLASH_SR_BSY) == FLASH_SR_BSY);
}
void flash_clear_pgerr_flag(void) void flash_clear_pgerr_flag(void)
{ {
FLASH_SR |= FLASH_SR_PGERR; FLASH_SR |= FLASH_SR_PGERR;
@ -57,10 +62,11 @@ void flash_clear_wrprterr_flag(void)
} }
/*---------------------------------------------------------------------------*/ /*---------------------------------------------------------------------------*/
/** @brief Clear All Status Flags /** @brief Clear All Status Flags
Clears program error, end of operation, busy flags. Clears program error, end of operation, busy flags.
*/ */
void flash_clear_status_flags(void) void flash_clear_status_flags(void)
{ {
@ -69,5 +75,43 @@ void flash_clear_status_flags(void)
flash_clear_eop_flag(); flash_clear_eop_flag();
} }
void flash_program_half_word(uint32_t address, uint16_t data)
{
flash_wait_for_last_operation();
FLASH_CR |= FLASH_CR_PG;
MMIO16(address) = data;
flash_wait_for_last_operation();
FLASH_CR &= ~FLASH_CR_PG;
}
void flash_erase_page(uint32_t page_address)
{
flash_wait_for_last_operation();
FLASH_CR |= FLASH_CR_PER;
FLASH_AR = page_address;
FLASH_CR |= FLASH_CR_STRT;
flash_wait_for_last_operation();
FLASH_CR &= ~FLASH_CR_PER;
}
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;
}
/**@}*/ /**@}*/