Wonder if someone can help me. I am fairly new to C coding on these chips, but have had a lot of success through trial and error and reading a lot of blogs, forum posts etc.
Most of the code below is borrowed from other peoples articles about erasing/writing and reading from the MSP430 flash memory system.
#include <msp430.h>
//*************************************************************************
// Erase Information Flash
//*************************************************************************
void flash_erase(int *addr)
{
__disable_interrupt(); // Disable interrupts. This is important, otherwise,
// a flash operation in progress while interrupt may
// crash the system.
while(BUSY & FCTL3); // Check if Flash being used
FCTL2 = FWKEY + FSSEL_1 + FN3; // Clk = SMCLK/4
FCTL1 = FWKEY + ERASE; // Set Erase bit
FCTL3 = FWKEY; // Clear Lock bit
*addr = 0; // Dummy write to erase Flash segment
while(BUSY & FCTL3); // Check if Flash being used
FCTL1 = FWKEY; // Clear WRT bit
FCTL3 = FWKEY + LOCK; // Set LOCK bit
__enable_interrupt();
}
//*************************************************************************
// Read stored Information flash
//*************************************************************************
void flash_write(int *addr)
{
__disable_interrupt();
FCTL2 = FWKEY + FSSEL_1 + FN0; // Clk = SMCLK/4
FCTL3 = FWKEY; // Clear Lock bit
FCTL1 = FWKEY + WRT; // Set WRT bit for write operation
*addr++ = 50; // copy value to flash
*addr++ = 51; // copy value to flash
FCTL1 = FWKEY; // Clear WRT bit
FCTL3 = FWKEY + LOCK; // Set LOCK bit
while(BUSY & FCTL3);
__enable_interrupt();
}
/*
* main.c
*/
int main(void) {
WDTCTL = WDTPW | WDTHOLD; // Stop watchdog timer
int *addr = (int *)0x0E000 ; // Address of the flash memory segment starting
int *addr2 = (int *)0x0E000 ; // Address of the flash memory segment starting
int i;
int j;
flash_erase(addr);
flash_write(addr);
i = *addr2;
j = *addr2;
return 0;
}
The code above is just test code to see if I can write to memory and then read it back afterwards.
If I run this code it does work, using the CCS Memory dump tool I can see the values of 50 and 51 in the right locations of flash memory. However, if I try to put a breakpoint at either line 63 or 64, it actually won't hit debug until the return 0; statement that follows, and there is nothing in variables I or J.
I am guessing I am doing something stupid - but I really can't tell what it is.
Any idea? (thanks in advance!)
