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stm32 FLASH allow non blocking operation on constrained devices

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On a very memory constrained device with a single task. The
   sem_wait and sem_post operations can be disabled, to save space.
   The default is blocking enabled.
This commit is contained in:
David Sidrane 2017-08-31 07:39:12 -10:00
parent 27cfde9968
commit ad2ef95ddf
2 changed files with 15 additions and 1 deletions
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8
arch/arm/src/stm32/Kconfig
View File

@ -2832,6 +2832,14 @@ config STM32_FLASH_PREFETCH
on F1 parts). Some early revisions of F4 parts do not support FLASH pre-fetch
properly and enabling this option may interfere with ADC accuracy.
config STM32_FLASH_NONBLOCKING
bool "Remove Blocking operation in FLASH driver"
default n
---help---
Enable this on single task platforms to conserve code space.
It removes the sem_wait and post operations that are not
needed in a single task environment.
config STM32_FLASH_WORKAROUND_DATA_CACHE_CORRUPTION_ON_RWW
bool "Workaround for FLASH data cache corruption"
default n

8
arch/arm/src/stm32/stm32_flash.c
View File

@ -100,23 +100,29 @@
* Private Data
************************************************************************************/
#if !defined(CONFIG_STM32_FLASH_NONBLOCKING)
static sem_t g_sem = SEM_INITIALIZER(1);
#endif
/************************************************************************************
* Private Functions
************************************************************************************/
static void sem_lock(void)
static inline void sem_lock(void)
{
#if !defined(CONFIG_STM32_FLASH_NONBLOCKING)
while (sem_wait(&g_sem) < 0)
{
DEBUGASSERT(errno == EINTR);
}
#endif
}
static inline void sem_unlock(void)
{
#if !defined(CONFIG_STM32_FLASH_NONBLOCKING)
sem_post(&g_sem);
#endif
}
#if !defined(CONFIG_STM32_STM32L15XX)