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stm32:l4: flash: Program in double words

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According to RM0351 and RM0394 flash needs to be programmed by double words.
Also fix flash_program() which was wrong anyways.

Reviewed-by: Karl Palsson <karlp@tweak.net.au>
This commit is contained in:
Bruno Randolf 2017-12-22 12:39:58 +00:00 committed by Karl Palsson
parent 49a3cddba0
commit a1ffdc59f0
2 changed files with 14 additions and 16 deletions
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2
include/libopencm3/stm32/l4/flash.h
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@ -228,7 +228,7 @@ void flash_clear_size_flag(void);
void flash_clear_pgaerr_flag(void);
void flash_clear_wrperr_flag(void);
void flash_lock_option_bytes(void);
void flash_program_word(uint32_t address, uint32_t data);
void flash_program_double_word(uint32_t address, uint64_t data);
void flash_program(uint32_t address, uint8_t *data, uint32_t len);
void flash_erase_page(uint32_t page);
void flash_erase_all_pages(void);

28
lib/stm32/l4/flash.c
View File

@ -108,15 +108,16 @@ void flash_lock_option_bytes(void)
FLASH_CR |= FLASH_CR_OPTLOCK;
}
/** @brief Program a 32 bit Word to FLASH
* This performs all operations necessary to program a 32 bit word to FLASH
* memory. The program error flag should be checked separately for the event
* that memory was not properly erased.
/** @brief Program a 64 bit word to FLASH
*
* This performs all operations necessary to program a 64 bit word 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 word to write
* @param[in] data Double word to write
*/
void flash_program_word(uint32_t address, uint32_t data)
void flash_program_double_word(uint32_t address, uint64_t data)
{
/* Ensure that all flash operations are complete. */
flash_wait_for_last_operation();
@ -124,8 +125,9 @@ void flash_program_word(uint32_t address, uint32_t data)
/* Enable writes to flash. */
FLASH_CR |= FLASH_CR_PG;
/* Program the word. */
MMIO32(address) = data;
/* Program the each word separately. */
MMIO32(address) = (uint32_t)data;
MMIO32(address+4) = (uint32_t)(data >> 32);
/* Wait for the write to complete. */
flash_wait_for_last_operation();
@ -140,16 +142,12 @@ void flash_program_word(uint32_t address, uint32_t data)
* 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.
* @param[in] len Length of data block in bytes (multiple of 8).
*/
void flash_program(uint32_t address, uint8_t *data, uint32_t len)
{
/* TODO: Use dword and word size program operations where possible for
* turbo speed.
*/
uint32_t i;
for (i = 0; i < len; i++) {
flash_program_word(address+i, data[i]);
for (uint32_t i = 0; i < len; i += 8) {
flash_program_double_word(address+i, *(uint64_t*)(data + i));
}
}