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limit LittleFS on STM32 to 28 KiB

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add a runtime check for available space (probably overkill)
This commit is contained in:
Daniel Peter Chokola 2025-02-22 13:24:51 -05:00
parent ef527fc22f
commit 85989a13f9
1 changed files with 12 additions and 4 deletions
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16
src/platform/stm32wl/LittleFS.cpp
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@ -35,12 +35,15 @@
#define STM32WL_PAGE_COUNT (FLASH_PAGE_NB) #define STM32WL_PAGE_COUNT (FLASH_PAGE_NB)
#define STM32WL_FLASH_BASE (FLASH_BASE) #define STM32WL_FLASH_BASE (FLASH_BASE)
/* FLASH_SIZE from stm32wle5xx.h will read the actual FLASH size from the chip */ /*
/* use the last 1/4 of the FLASH */ * FLASH_SIZE from stm32wle5xx.h will read the actual FLASH size from the chip.
#define LFS_FLASH_TOTAL_SIZE (FLASH_SIZE / 8) * FLASH_END_ADDR is calculated from FLASH_SIZE.
* Use the last 28 KiB of the FLASH
*/
#define LFS_FLASH_TOTAL_SIZE (14 * 2048) /* needs to be a multiple of LFS_BLOCK_SIZE */
#define LFS_BLOCK_SIZE (2048) #define LFS_BLOCK_SIZE (2048)
#define LFS_FLASH_ADDR_END (FLASH_END_ADDR) #define LFS_FLASH_ADDR_END (FLASH_END_ADDR)
#define LFS_FLASH_ADDR_BASE (LFS_FLASH_ADDR_END - (FLASH_SIZE / 8) + 1) #define LFS_FLASH_ADDR_BASE (LFS_FLASH_ADDR_END - LFS_FLASH_TOTAL_SIZE + 1)
#if !CFG_DEBUG #if !CFG_DEBUG
#define _LFS_DBG(fmt, ...) #define _LFS_DBG(fmt, ...)
@ -182,6 +185,11 @@ LittleFS::LittleFS(void) : STM32_LittleFS(&_InternalFSConfig) {}
bool LittleFS::begin(void) bool LittleFS::begin(void)
{ {
if(FLASH_BASE >= LFS_FLASH_ADDR_BASE)
{
/* There is not enough space on this device for a filesystem. */
return false;
}
// failed to mount, erase all pages then format and mount again // failed to mount, erase all pages then format and mount again
if (!STM32_LittleFS::begin()) { if (!STM32_LittleFS::begin()) {
// Erase all pages of internal flash region for Filesystem. // Erase all pages of internal flash region for Filesystem.