LPC MicrocontrollersのトピックRe: IAP How to know where to save a data

IAP How to know where to save a data

lpcware — Wed, 15 Jun 2016 19:25:34 GMT

Content originally posted in LPCWare by drvrh on Sun Jul 26 22:56:01 MST 2015
Hello,

How to know where to save a data when using IAP. I would like saving data from array. User who have a system, will fill a data array and when data array is full, save into a EEPROM -(IAP) - other options. And when user turn on system, data available.

But I don't know on which location must saving data. I read AN10995 and in this is drawing table Figure 4 (sect. 3.1). I don't understand where saving a my program when programming and where save a data.

I see on LPCXpresso in the right click on project -> Properties -> In the section C/C++ build - MCU settings. I have options edit memory in LPC. My idea is: add Flash or Add RAM (I don't know which) who reserved just for my data. And then get addresses and size of memory. I must have a 336 bits of memory for my data. It's OK?

Please help me.

Re: IAP How to know where to save a data

lpcware — Wed, 15 Jun 2016 19:25:35 GMT

Content originally posted in LPCWare by R2D2 on Mon Jul 27 00:07:22 MST 2015
:quest:

AN11008: Flash based non-volatile storage (with software)

https://www.lpcware.com/content/nxpfile/an11008-flash-based-non-volatile-storage-software

Re: IAP How to know where to save a data

lpcware — Wed, 15 Jun 2016 19:25:36 GMT

Content originally posted in LPCWare by drvrh on Mon Jul 27 00:41:16 MST 2015
Which difference betwen NVOL and IAP?

When I see this example in attachments is very similar as IAP. I have a small size of my flash for my using. Now I have a 21k flash I have must create a I2C communication and store data. if I using this library who attach, is oversize.

Re: IAP How to know where to save a data

lpcware — Wed, 15 Jun 2016 19:25:36 GMT

Content originally posted in LPCWare by TheFallGuy on Mon Jul 27 01:44:22 MST 2015
Looks like you have been misled by pointing at that application note - that is talking about adding an external EEPROM device and connecting it to I2C.

All you need to do is to use IAP to store your data in the on-chip flash. The simplest way of doing this to to choose a location that you do not think your application will use. Typically this is at the end of flash. As flash is sector based, you need to reserve the last sector of the flash and (for safety) exclude it from your memory map (by editing the memory configuration and reducing the size of the flash by 1 sector)

You then have that last sector to store whatever you need. Use IAP to write the data (and use pointers to read it)

Re: IAP How to know where to save a data

lpcware — Wed, 15 Jun 2016 19:25:37 GMT

Content originally posted in LPCWare by R2D2 on Mon Jul 27 02:00:02 MST 2015
:quest:

flash_nvol.c is using IAP

 // prepare sector
  Command[0] = 50;
  Command[1] = Sector->Num;
  Command[2] = Sector->Num;
  DISABLEIRQ;
  mIAPEntry(Command, Result);
  ENABLEIRQ;
  if (Result[0] != CMD_SUCCESS) return FALSE; 

  // write to sector
  Command[0] = 51;
  Command[1] = (UNSIGNED32)(Sector->Addr);
  Command[2] = (UNSIGNED32)Buffer;
  Command[3] = 256;
  Command[4] = CPU_CLK;
  DISABLEIRQ;
  mIAPEntry(Command, Result);
  ENABLEIRQ;
  if (Result[0] != CMD_SUCCESS) return FALSE;

  // verify
  Command[0] = 56;
  Command[1] = (UNSIGNED32)(Sector->Addr);
  Command[2] = (UNSIGNED32)Buffer;
  Command[3] = sizeof(SecRec);
  DISABLEIRQ;
  mIAPEntry(Command, Result);
  ENABLEIRQ;
  if (Result[0] != CMD_SUCCESS) return FALSE;

If you read UM10398 Chapter 26.7 IAP commands or search the forum you'll find several samples:

https://www.lpcware.com/content/forum/storing-settings

Re: IAP How to know where to save a data

lpcware — Wed, 15 Jun 2016 19:25:38 GMT

Content originally posted in LPCWare by drvrh on Mon Jul 27 02:00:32 MST 2015
We use this microprocessor because is very cheap, and we have a manufacturing 250k peace our system.

The Fall Guy thank's for reply. I understand all, how to set and how to read. But I'm not sure if I understand how set or defined memory location and size.

I don't have complete program now and I don't know if I can reserved the end of flash for my data. What if, later my program size over my data.

OK it might be OK if I say: reserve flash data at 30k to 32k and other from 21k (my program size now) to 30k is empty.

Re: IAP How to know where to save a data

lpcware — Wed, 15 Jun 2016 19:25:38 GMT

Content originally posted in LPCWare by TheFallGuy on Mon Jul 27 02:06:52 MST 2015

Quote:
I don't have complete program now and I don't know if I can reserved the end of flash for my data. What if, later my program size over my data.

Well, if it does grow to 32k, you are not going to have anything left to store data in...

You can, of course, store less than a sector of data, but you will need to read existing values, modify your values and then write the whole sector back.

Also, don't forget that when writing to flash, you need to be running from RAM...

Re: IAP How to know where to save a data

lpcware — Wed, 15 Jun 2016 19:25:39 GMT

Content originally posted in LPCWare by drvrh on Mon Jul 27 03:12:18 MST 2015
OK

i have an array who contains 336 bits (42 B) but I can't store this array into a flash. Maybe who have a example.

Re: IAP How to know where to save a data

lpcware — Wed, 15 Jun 2016 19:25:39 GMT

Content originally posted in LPCWare by TheFallGuy on Mon Jul 27 03:24:00 MST 2015
So what did you do? And what didn't work?

Re: IAP How to know where to save a data

lpcware — Wed, 15 Jun 2016 19:25:40 GMT

Content originally posted in LPCWare by drvrh on Mon Jul 27 03:45:27 MST 2015
For first I run program from here

And added in main program

#define CONFIG_FLASH_OFFSET            0x1000
#define CONFIG_FLASH_SECTOR            (CONFIG_FLASH_OFFSET >> 12)
#define CONFIG_FLASH_SECTOR_SIZE    1

static uint8_t demo_messg[] = "Greetings from IAP";

int main(){

  __e_iap_status iap_status;
iap_init();

     while(1){

       /* Prepare the sector for erase */
        iap_status = (__e_iap_status) iap_prepare_sector(CONFIG_FLASH_SECTOR,
                (CONFIG_FLASH_SECTOR + CONFIG_FLASH_SECTOR_SIZE));
        if (iap_status != CMD_SUCCESS) while(1);

        /* Erase the sector */
        iap_status = (__e_iap_status) iap_erase_sector(CONFIG_FLASH_SECTOR,
                (CONFIG_FLASH_SECTOR + CONFIG_FLASH_SECTOR_SIZE));
        if (iap_status != CMD_SUCCESS) while(1);

        /* Prepare the sector for writing */
        iap_status = (__e_iap_status) iap_prepare_sector(CONFIG_FLASH_SECTOR,
                (CONFIG_FLASH_SECTOR + CONFIG_FLASH_SECTOR_SIZE));
        if (iap_status != CMD_SUCCESS) while(1);

        /* write data to flash */
        iap_status = (__e_iap_status) iap_copy_ram_to_flash(&demo_messg,
                (void *)CONFIG_FLASH_OFFSET, 256);
        if (iap_status != CMD_SUCCESS) while(1);
}

}

But when I run program and debuggin him now I start with step into, and all works fine but when I come here stopped all. No go next.

        iap_status = (__e_iap_status) iap_prepare_sector(CONFIG_FLASH_SECTOR,
                (CONFIG_FLASH_SECTOR + CONFIG_FLASH_SECTOR_SIZE));

stopped when is HardFault Handler.

Ok and I debug repeat, in the second time debug stopped here:

        iap_status = (__e_iap_status) iap_erase_sector(CONFIG_FLASH_SECTOR,
                (CONFIG_FLASH_SECTOR + CONFIG_FLASH_SECTOR_SIZE));

stopped when is Hard Fault Handler.

Re: IAP How to know where to save a data

lpcware — Wed, 15 Jun 2016 19:25:41 GMT

Content originally posted in LPCWare by TheFallGuy on Mon Jul 27 03:49:58 MST 2015
So what about my comment

Quote:
Also, don't forget that when writing to flash, you need to be running from RAM...

You are trying to update the flash while running from it.

Just search the forums for "IAP Example" for further help.

Re: IAP How to know where to save a data

lpcware — Wed, 15 Jun 2016 19:25:41 GMT

Content originally posted in LPCWare by drvrh on Mon Jul 27 04:02:01 MST 2015
Yes I have a problem with this

#define CONFIG_FLASH_OFFSET            0x1000

Here is location 4096, on this location I have a program.

Now I'm set this, for location 25k because I don't have program here, my program is end with 21k size.

#define CONFIG_FLASH_OFFSET            0x61A8

But now stopped when I writting with IAP.

 if (iap_status != CMD_SUCCESS) while(1);

In this while stopped, because is not cmd success.

Re: IAP How to know where to save a data

lpcware — Wed, 15 Jun 2016 19:25:42 GMT

Content originally posted in LPCWare by LabRat on Mon Jul 27 04:02:50 MST 2015

Quote: drvrh
...stopped when is Hard Fault Handler.

As R2D2 already posted, the usual Hard Fault error (no reserved IAP RAM) is described here:

https://www.lpcware.com/content/forum/storing-settings

Re: IAP How to know where to save a data

lpcware — Wed, 15 Jun 2016 19:25:42 GMT

Content originally posted in LPCWare by LabRat on Mon Jul 27 04:07:11 MST 2015

Quote: drvrh
Now I'm set this, for location 25k because I don't have program here, my program is end with 21k size.

#define CONFIG_FLASH_OFFSET            0x61A8

Are you kidding us?

Which sector are you trying to use?

Read User manual Chapter 26.3.6 Flash configuration for LPC1100XL series...

Re: IAP How to know where to save a data

lpcware — Wed, 15 Jun 2016 19:25:43 GMT

Content originally posted in LPCWare by drvrh on Mon Jul 27 04:16:28 MST 2015
Sorry. Yes my mistake. I'm not read this chapter.
Now I'm settings

#define CONFIG_FLASH_OFFSET            0x00006000

on this location. Now I must read.

I read from storage with pointer it's OK?
I post when I successful.

Re: IAP How to know where to save a data

lpcware — Wed, 15 Jun 2016 19:25:44 GMT

Content originally posted in LPCWare by drvrh on Mon Jul 27 04:35:43 MST 2015

st = * ((uint8_t *) 0x00006000);

this is my pointer who call my value from storage. In storage I have

static uint8_t demo_messg = 123;

And I get beautiful 123 ....

Thank's for all, now I go programming for write and read array.

Re: IAP How to know where to save a data

lpcware — Wed, 15 Jun 2016 19:25:44 GMT

Content originally posted in LPCWare by LabRat on Mon Jul 27 04:55:29 MST 2015

Quote: TheFallGuy
So what about my comment

Quote:
Also, don't forget that when writing to flash, you need to be running from RAM...

That's not necessary for a simple IAP sector write with 'unused' sectors ;-)

Re: IAP How to know where to save a data

lpcware — Wed, 15 Jun 2016 19:25:45 GMT

Content originally posted in LPCWare by drvrh on Mon Jul 27 06:02:55 MST 2015
Now I transfer function for write and read on the other clas, but here not working .

From prepare to write goes program without problem. When wrtie data into flash I get error:

 SRC_ADDR_ERROR,

why, when debuggin addres for flash is ( 24576) for ram addres is bigger number (268443575).

Why?

Re: IAP How to know where to save a data

lpcware — Wed, 15 Jun 2016 19:25:45 GMT

Content originally posted in LPCWare by drvrh on Mon Jul 27 06:11:14 MST 2015
I have a function

void SaveIntoFlashINT(uint8_t input_data){

.....
.....
    iap_status = (__e_iap_status) iap_copy_ram_to_flash(&input_data,
            (void *)CONFIG_FLASH_OFFSET, 256);
    if (iap_status != CMD_SUCCESS) while(1);
}

but now working.

When I move input_data from function and define variable in the start of program

static uint8_t input_data;

now working.

And very important is the variable must be static.

Re: IAP How to know where to save a data

lpcware — Wed, 15 Jun 2016 19:25:46 GMT

Content originally posted in LPCWare by LabRat on Mon Jul 27 06:27:38 MST 2015

Quote: drvrh
I have a function
...
but now working.

When I move input_data from function and define variable in the start of program

static uint8_t input_data;

now working.

And very important is the variable must be static.

Please stop posting code snippets |(

Post complete files or projects and describe the problem...

Quote:

but now working.

...
now working.

:quest:

And please read a C book, you probably don't know how parameter passing is working

http://www.c4learn.com/c-programming/c-function-parameter-passing/