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Code Issues Releases Activity

Flash internal: writes optimization using 4 bytes parallelism

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This commit is contained in:
Alessio Morale 2013-05-11 22:04:47 +02:00
parent 687e75b2e2
commit 511283c608
1 changed files with 11 additions and 7 deletions
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18
flight/pios/stm32f4xx/pios_flash_internal.c
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@ -276,16 +276,20 @@ static int32_t PIOS_Flash_Internal_WriteData(uintptr_t flash_id, uint32_t addr,
/* Write crosses the end of the sector */ /* Write crosses the end of the sector */
return -3; return -3;
} }
FLASH_Status status;
for (uint16_t i = 0; i < len/4; i++){
uint32_t data_word = *(uint32_t *)(data + i*4);
status = FLASH_ProgramWord(addr + i * 4, data_word);
if(status != FLASH_COMPLETE)
return -4;
}
/* Write the data */ /* Write the data */
for (uint16_t i = 0; i < len; i++) { for (uint16_t i = len - len % 4; i < len; i++) {
FLASH_Status status;
/*
* This is inefficient. Should try to do word writes.
* Not sure if word writes need to be aligned though.
*/
status = FLASH_ProgramByte(addr + i, data[i]); status = FLASH_ProgramByte(addr + i, data[i]);
PIOS_Assert(status == FLASH_COMPLETE); if(status != FLASH_COMPLETE)
return -5;
} }
return 0; return 0;