Question: "How can I store a value, let's say 32, to address 0x1040 in the FLASH memory?"
Answer 1: from old_cow_yellow
ORG 0x1040 DB 0x32 END
Answer 2: from Ajesh GUPTA
Flash_ptr = (int *)0x1040; FCTL3 = FWKEY; // Clear Lock bit FCTL1 = FWKEY + ERASE; // Set Erase bit *Flash_ptr = 0; // Dummy write to erase Flash seg FCTL1 = FWKEY; // Clear WRT bit FCTL3 = FWKEY + LOCK; // Set LOCK bit FCTL1 = FWKEY + WRT; // Set WRT bit for write operation *Flash_ptr = value; FCTL1 = FWKEY; // Clear WRT bit FCTL3 = FWKEY + LOCK; // Set LOCK bit
Answer 3: from Darren Logan
first turn OFF interrupts
/* PROCEDURE: write to flash memory ----------------------------------------------------------*/
void FlashWrite(unsigned int faddress, unsigned int word)
{
/* Note this procedure does NOT erase the flash segment before writing the new value.
Writing a new value over an old value does not work as the flash cells will only accept
a written 0 and not a written 1. You must erase the whole segment before writing a new value. */
int *Flash_ptr; /* Flash pointer */
Flash_ptr = (int *) 0x1000 + faddress; /* Initialize Flash pointer (segment B - start of info. memory) */
FCTL1 = FWKEY + ERASE; /* Set Erase bit */
FCTL3 = FWKEY; /* Clear LOCK bit */
FCTL1 = FWKEY + WRT; /* Set WRT bit for write operation */
*Flash_ptr=word; /* Write the word to flash */
FCTL1 = FWKEY; /* Clear WRT bit */
FCTL3 = FWKEY + LOCK; /* Reset LOCK bit */
} /* FlashWrite */
To avoid Flash25 bug, do not use @Rn or @Rn+ to read the FLASH during marginal read mode. Use X(Rn) as the source address is ok. (But be aware that most assemblers will change 0(Rn) to @Rn behind your back.
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