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stm32l0/l1: flash: support half page flashing

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Tested on L1 and L0 using the "dapboot" project, see
https://github.com/devanlai/dapboot/pull/27 for L1
and
https://github.com/devanlai/dapboot/pull/30 for L0
This commit is contained in:
Karl Palsson
2020-10-16 10:35:07 +00:00
parent b88196f807
commit 43b3fa5ddc
4 changed files with 46 additions and 1 deletions
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13
include/libopencm3/stm32/common/flash_common_l01.h
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@@ -120,6 +120,19 @@ void flash_unlock_progmem(void);
void flash_lock_progmem(void);
void flash_lock_option_bytes(void);
void flash_unlock_acr(void);
/** Erase a page in flash.
* @param page_address For L1, must be first word in page, L0 doesn't care
* Takes 1 tprog. Flash must already be unlocked!
*/
void flash_erase_page(uint32_t page_address);
/**
* Write a half page from buf to dst.
* This function _must_ be in ram! (See the Ref Man for more details)
* @param dst where to write to, expected to be aligned and erased.
* @param buf the half page to write, size required depends on target
*/
void flash_program_half_page(uint32_t *dst, void *buf);
void eeprom_program_word(uint32_t address, uint32_t data);
void eeprom_program_words(uint32_t address, uint32_t *data, int length_in_words);

2
include/libopencm3/stm32/l0/flash.h
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@@ -55,6 +55,8 @@
/* --- FLASH_OPTR values ----------------------------------------------------- */
#define FLASH_OPTR_NBOOT1 (1 << 31)
#define FLASH_HALF_PAGE_SIZE 16
BEGIN_DECLS
END_DECLS

2
include/libopencm3/stm32/l1/flash.h
View File

@@ -56,7 +56,7 @@
/* --- FLASH_SR values ----------------------------------------------------- */
#define FLASH_SR_OPTVERRUSR (1 << 12)
/* --- Function prototypes ------------------------------------------------- */
#define FLASH_HALF_PAGE_SIZE 32
BEGIN_DECLS

30
lib/stm32/common/flash_common_l01.c
View File

@@ -97,6 +97,36 @@ void flash_unlock_acr(void)
FLASH_PDKEYR = FLASH_PDKEYR_PDKEY2;
}
/**
* Erase a page in ram.
* @param page_address must be first word in page for L1, any address in page for L0
*/
void flash_erase_page(uint32_t page_address)
{
FLASH_PECR |= FLASH_PECR_ERASE | FLASH_PECR_PROG;
MMIO32(page_address) = 0;
while ((FLASH_SR & FLASH_SR_BSY) == FLASH_SR_BSY);
FLASH_PECR &= ~(FLASH_PECR_ERASE | FLASH_PECR_PROG);
}
/* Must be run from RAM (per ref manual), and because it's in ram, more
* than 64MB away from flash address space, must be a long_call. */
__attribute__ ((long_call, section (".ramtext")))
void flash_program_half_page(uint32_t *dst, void *buf)
{
uint32_t *src = buf;
/* Enable half page writes to program memory */
FLASH_PECR |= FLASH_PECR_FPRG | FLASH_PECR_PROG;
while ((FLASH_SR & FLASH_SR_BSY) == FLASH_SR_BSY);
for (int i = 0; i < FLASH_HALF_PAGE_SIZE; i++) {
*dst++ = *src++;
}
while ((FLASH_SR & FLASH_SR_BSY) == FLASH_SR_BSY);
FLASH_PECR &= ~(FLASH_PECR_FPRG | FLASH_PECR_PROG);
}
/** @brief Write a word to eeprom
*
* @param address assumed to be in the eeprom space, no checking