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stm32: add support for stm32f4 flash operations

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Signed-off-by:  Eric Callahan <arksine.code@gmail.com>
This commit is contained in:
Eric Callahan 2022-05-13 20:09:33 -04:00 committed by Eric Callahan
parent fc96f0c9bd
commit fbf59301b3
3 changed files with 79 additions and 7 deletions
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2
src/flashcmd.c
View File

@ -72,7 +72,7 @@ flashcmd_is_in_transfer(void)
static void
write_page(uint32_t page_address)
{
flash_write_page(page_address, (uint16_t*)page_buffer);
flash_write_page(page_address, page_buffer);
memset(page_buffer, 0xFF, sizeof(page_buffer));
last_page_address = page_address;
page_pending = 0;

82
src/stm32/flash.c
View File

@ -9,6 +9,13 @@
#include "flash.h" // flash_write_page
#include "internal.h" // FLASH
#define STM32F4_MIN_SECTOR_SIZE 16384
#define STM32F4_MAX_SECTOR_SIZE 131072
#if CONFIG_MACH_STM32F4
#define FLASH_KEY1 (0x45670123UL)
#define FLASH_KEY2 (0xCDEF89ABUL)
#endif
uint32_t
flash_get_page_size(void)
{
@ -38,11 +45,64 @@ flash_complete(void)
}
void
flash_write_page(uint32_t page_address, uint16_t *data)
flash_write_stm32f4xx(uint32_t page_address, uint32_t *data)
{
// A page_index of 0 is the first page of the application area
#if CONFIG_MACH_STM32F4
uint32_t flash_page_size = flash_get_page_size();
uint16_t* page_addr = (uint16_t*)(page_address);
uint32_t* page = (uint32_t*)(page_address);
if (FLASH->CR & FLASH_CR_LOCK)
unlock_flash();
uint8_t need_erase = 0;
uint32_t offset_addr = page_address - CONFIG_FLASH_START;
uint32_t sector_index = offset_addr / STM32F4_MAX_SECTOR_SIZE;
if (sector_index < 1) {
need_erase = ((page_address % STM32F4_MIN_SECTOR_SIZE) == 0);
sector_index = offset_addr / STM32F4_MIN_SECTOR_SIZE;
if (sector_index > 3) {
need_erase &= (sector_index == 4);
sector_index = 4;
}
} else {
need_erase = ((page_address % STM32F4_MAX_SECTOR_SIZE) == 0);
sector_index += 4;
}
while (FLASH->SR & FLASH_SR_BSY);
FLASH->CR &= ~FLASH_CR_PSIZE;
FLASH->CR &= ~FLASH_CR_SNB;
if (need_erase) {
FLASH->CR |= FLASH_CR_PSIZE_1;
FLASH->CR |= FLASH_CR_SER | ((sector_index & 0xF) << 3);
FLASH->CR |= FLASH_CR_STRT;
while (FLASH->SR & FLASH_SR_BSY);
FLASH->CR &= ~FLASH_CR_SNB;
do {
FLASH->CR &= ~FLASH_CR_SER;
} while(FLASH->CR & FLASH_CR_SER);
}
FLASH->CR |= FLASH_CR_PSIZE_1;
FLASH->CR |= FLASH_CR_PG;
for (uint16_t i = 0; i < flash_page_size / 4; i++)
{
page[i] = data[i];
while (FLASH->SR & FLASH_SR_BSY);
}
do {
FLASH->CR &= ~FLASH_CR_PG;
} while(FLASH->CR & FLASH_CR_PG);
FLASH->CR |= FLASH_CR_LOCK;
#endif
}
void
flash_write_stm32f1xx(uint32_t page_address, uint16_t *data)
{
#if CONFIG_MACH_STM32F0 || CONFIG_MACH_STM32F1
uint32_t flash_page_size = flash_get_page_size();
uint16_t* page = (uint16_t*)(page_address);
// make sure flash is unlocked
if (FLASH->CR & FLASH_CR_LOCK)
@ -50,7 +110,7 @@ flash_write_page(uint32_t page_address, uint16_t *data)
// Erase page
FLASH->CR |= FLASH_CR_PER;
FLASH->AR = (uint32_t)page_addr;
FLASH->AR = (uint32_t)page;
FLASH->CR |= FLASH_CR_STRT;
while (FLASH->SR & FLASH_SR_BSY);
do {
@ -61,13 +121,25 @@ flash_write_page(uint32_t page_address, uint16_t *data)
FLASH->CR |= FLASH_CR_PG;
for (uint16_t i = 0; i < flash_page_size / 2; i++)
{
page_addr[i] = data[i];
page[i] = data[i];
while (FLASH->SR & FLASH_SR_BSY);
}
do {
FLASH->CR &= ~FLASH_CR_PG;
} while (FLASH->CR & FLASH_CR_PG);
FLASH->CR |= FLASH_CR_LOCK;
#endif
}
void
flash_write_page(uint32_t page_address, void *data)
{
if (CONFIG_MACH_STM32F4) {
flash_write_stm32f4xx(page_address, (uint32_t *)data);
} else {
flash_write_stm32f1xx(page_address, (uint16_t *)data);
}
}
void

2
src/stm32/flash.h
View File

@ -5,7 +5,7 @@
uint32_t flash_get_page_size(void);
void flash_complete(void);
void flash_write_page(uint32_t page_address, uint16_t *data);
void flash_write_page(uint32_t page_address, void *data);
void flash_read_block(uint32_t block_address, uint32_t *buffer);
#endif