Hi,
can someone explain to me what the purpose of 
;i < 4; and (offset * 4) in the code block

     for(i=0;i<4;i++)
     {
         save(charptr[i], i + (offset * 4));
     }
found in readdouble and savedouble functions?

would it be any different if i want to write an int?

thanks in advance

John



--- In msp430@msp4..., "M. Adam Davis" <adavis@...> wrote:
>
> Below you'll find the code I use to
> * Erase entire infomemory
> * Read/Write single bytes from/to infomemory
> * Read/Write Doubles from/to infomemory
> 
> I hope you find this useful.  You will likely have to check out 
all of 
> the setup parameters (especially flash clock) in
order to make it 
work 
> well on your system.
> 
> -Adam
> 
> const unsigned char * INFOMEM = (unsigned char *) 0x1000;
> 
> // Erase entire information memory
> int erase(void)
> {
>     unsigned char * segment;
>     segment = (unsigned char *) INFOMEM;
>    
>     FCTL2 = FWKEY + FSSEL_1 + FN0 + FN1; // Select MCLK/3 
(1.04MHz / 3)
> 
>     FCTL3 = FWKEY; // Unlock flash memory
>     FCTL1 = FWKEY + ERASE; // Set erase segment mode   
>     *segment = 0; // Dummy write to segment we are erasing
>     while((FCTL3 & WAIT) != WAIT);
>  
>     segment += 128; // Point to next segment
>      FCTL3 = FWKEY; // Unlock flash memory
>     FCTL1 = FWKEY + ERASE; // Set erase segment mode   
>     *segment = 0; // Dummy write to segment we are erasing
>     while((FCTL3 & WAIT) != WAIT); // Wait for erase to complete
> 
>     FCTL3 = FWKEY + LOCK; // Lock flash memory
>     return 1;
> }
> 
> // Save a byte to the information memory
> int save(char data, unsigned char address)
> {
>     char * segment;
>     segment = (char *) INFOMEM;
>    
>     FCTL2 = FWKEY + FSSEL_1 + FN0 + FN1; // Select MCLK/3 
(1.04MHz / 3)
> 
>     FCTL3 = FWKEY; // Unlock flash memory
>     FCTL1 = FWKEY + WRT; // Set write byte mode   
>     segment[address] = data; // Write byte
>     while((FCTL3 & WAIT) != WAIT); // Wait for write to complete
>     FCTL3 = FWKEY + LOCK; // Lock flash memory
>     return address;
> }
> 
> double readdouble(int offset)
> {// Read a double from infomem
>     double data;
>     int i;
>     char * charptr;
>     charptr = (char *) &data;
>    
>     for(i=0;i<4;i++)
>     {
>         charptr[i] = read(i + (offset * 4));
>     }           
>     return data;   
> }
> 
> int savedouble(double data, int offset)
> {// Save a double into infomem
>     char * charptr;
>     int i;
>     charptr = (char *) &data;
>    
>     for(i=0;i<4;i++)
>     {
>         save(charptr[i], i + (offset * 4));
>     }           
>     return 0;   
> }
> 
> char read(unsigned char address)
> {
>     char * segment;
>     segment = (char *) INFOMEM;
>     return segment[address];
> }
> 
> Ananth kumar wrote:
> 
> >Hello All,
> >
> >
> >How to write in flash memory when code is in running mode?
> >(not using the JTAG)
> >
> >Can anyone send me the application notes for "In-application 
> >programming with MSP430"?
> >
> >
> >Thanks in advance,
> >Ananth Kumar
> >
> >
> >
> >
> >
> >
> >
> >
> >.
> >
> > 
> >Yahoo! Groups Links
> >
> >
> >
> > 
> >
> >
> >
> >
> >
> >  
> >
>

Beginning Microcontrollers with the MSP430

Below you'll find the code I use to
* Erase entire infomemory
* Read/Write single bytes from/to infomemory
* Read/Write Doubles from/to infomemory

I hope you find this useful.  You will likely have to check out all of 
the setup parameters (especially flash clock) in order to make it work 
well on your system.

-Adam

const unsigned char * INFOMEM = (unsigned char *) 0x1000;

// Erase entire information memory
int erase(void)
{
    unsigned char * segment;
    segment = (unsigned char *) INFOMEM;
   
    FCTL2 = FWKEY + FSSEL_1 + FN0 + FN1; // Select MCLK/3 (1.04MHz / 3)

    FCTL3 = FWKEY; // Unlock flash memory
    FCTL1 = FWKEY + ERASE; // Set erase segment mode   
    *segment = 0; // Dummy write to segment we are erasing
    while((FCTL3 & WAIT) != WAIT);
 
    segment += 128; // Point to next segment
     FCTL3 = FWKEY; // Unlock flash memory
    FCTL1 = FWKEY + ERASE; // Set erase segment mode   
    *segment = 0; // Dummy write to segment we are erasing
    while((FCTL3 & WAIT) != WAIT); // Wait for erase to complete

    FCTL3 = FWKEY + LOCK; // Lock flash memory
    return 1;
}

// Save a byte to the information memory
int save(char data, unsigned char address)
{
    char * segment;
    segment = (char *) INFOMEM;
   
    FCTL2 = FWKEY + FSSEL_1 + FN0 + FN1; // Select MCLK/3 (1.04MHz / 3)

    FCTL3 = FWKEY; // Unlock flash memory
    FCTL1 = FWKEY + WRT; // Set write byte mode   
    segment[address] = data; // Write byte
    while((FCTL3 & WAIT) != WAIT); // Wait for write to complete
    FCTL3 = FWKEY + LOCK; // Lock flash memory
    return address;
}

double readdouble(int offset)
{// Read a double from infomem
    double data;
    int i;
    char * charptr;
    charptr = (char *) &data;
   
    for(i=0;i<4;i++)
    {
        charptr[i] = read(i + (offset * 4));
    }           
    return data;   
}

int savedouble(double data, int offset)
{// Save a double into infomem
    char * charptr;
    int i;
    charptr = (char *) &data;
   
    for(i=0;i<4;i++)
    {
        save(charptr[i], i + (offset * 4));
    }           
    return 0;   
}

char read(unsigned char address)
{
    char * segment;
    segment = (char *) INFOMEM;
    return segment[address];
}

Ananth kumar wrote:

>Hello All,
>
>
>How to write in flash memory when code is in running mode?
>(not using the JTAG)
>
>Can anyone send me the application notes for "In-application 
>programming with MSP430"?
>
>
>Thanks in advance,
>Ananth Kumar
>
>
>
>
>
>
>
>
>.
>
> 
>Yahoo! Groups Links
>
>
>
> 
>
>
>
>
>
>  
>

>From: Ananth kumar <s_ananth_kumar@s_an...>
>Subject: [msp430] Writing in flash in run time
>
>How to write in flash memory when code is in running mode?
>(not using the JTAG)
>
>Can anyone send me the application notes for "In-application 
>programming with MSP430"?
>

look at www.ti.com/

navigate to the MSP430 section and look for the Design Resources - Code
Examples.

under IAR examples there's the MSP-FET430P120 selection. in it,
there's the file: FET120_flash_write.c

Its header includes:
//MSP-FET430P120 Demo - Flash In-System Programming, Copy SegA to SegB
//
//  Description: This program first erases flash seg A, then it increments all
//  values in seg A, then it erases seg B, then  copies seg A to seg B.
//  Assumed MCLK 550kHz - 900kHz.

This might be what you want.

Try reading the manual, too. There's a whole chapter about the FLASH
system.

Rachel Adamec
Norristown, PA