diff options
| author | Karl Palsson <karlp@tweak.net.au> | 2018-07-26 02:37:12 +0300 |
|---|---|---|
| committer | Karl Palsson <karlp@tweak.net.au> | 2018-08-17 03:15:01 +0300 |
| commit | b8ede60d9d2c54a90b4065fdd9a2cca655495fba (patch) | |
| tree | 03c9f7543979d7a1371b584af6b98dc3a61de152 | |
| parent | 3293913be24735ad5e59a5c82f95b1211729c3dd (diff) | |
stm32f3: flash: support basic write/erase operations
Originally filed as https://github.com/libopencm3/libopencm3/pull/627
| -rw-r--r-- | include/libopencm3/stm32/f3/flash.h | 3 | ||||
| -rw-r--r-- | lib/stm32/f3/flash.c | 46 |
2 files changed, 48 insertions, 1 deletions
diff --git a/include/libopencm3/stm32/f3/flash.h b/include/libopencm3/stm32/f3/flash.h index ca561efb..a978ebf7 100644 --- a/include/libopencm3/stm32/f3/flash.h +++ b/include/libopencm3/stm32/f3/flash.h @@ -99,6 +99,9 @@ BEGIN_DECLS void flash_clear_pgerr_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 diff --git a/lib/stm32/f3/flash.c b/lib/stm32/f3/flash.c index ffd03c30..da8dfb68 100644 --- a/lib/stm32/f3/flash.c +++ b/lib/stm32/f3/flash.c @@ -46,6 +46,11 @@ #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) { FLASH_SR |= FLASH_SR_PGERR; @@ -57,10 +62,11 @@ void flash_clear_wrprterr_flag(void) } /*---------------------------------------------------------------------------*/ + /** @brief Clear All Status Flags Clears program error, end of operation, busy flags. -*/ + */ void flash_clear_status_flags(void) { @@ -69,5 +75,43 @@ void flash_clear_status_flags(void) 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; +} + + /**@}*/ |