topic Re: KEA128 Flash Erase and write problems in Kinetis Microcontrollers

KEA128 Flash Erase and write problems

east_sun — Fri, 13 Jul 2018 07:14:34 GMT

Hello, I am using TRK - KEA128 board debugging Flash, debug mode can run normally, but in normal mode, the Flash will not erase and write properly, the program runs in a Flash, whether need before erasing and writing the code loaded into RAM?If so, what should I do?

Re: KEA128 Flash Erase and write problems

mjbcswitzerland — Mon, 16 Jul 2018 05:19:18 GMT

You need to execute Flash routines from SRAM.
If you have difficulties just use the uTasker open source project (including TRK-KEA128 support) since it solves all such complications.

Regards

Mark

Kinetis: http://www.utasker.com/kinetis.html
Kinetis KEA128:
- http://www.utasker.com/kinetis/TRK-KEA128.html
- http://www.utasker.com/kinetis/FRDM-KEAZ128Q80.html

Re: KEA128 Flash Erase and write problems

miduo — Mon, 16 Jul 2018 06:10:41 GMT

Hi,

Yes,when executes Flash programming we need copy Flash programming routine from Flash to RAM then execute it from RAM. The reason is that when writing MCU Flash, program is also reading instruction from same Flash, but Flash can’t perform reading and writing parallel. So executing the flash programming routine from RAM can avoid Flash read/write conflict.

Re: KEA128 Flash Erase and write problems

east_sun — Mon, 16 Jul 2018 06:29:35 GMT

Thank you. About this point, I would like to ask, how should the copy program execute to RAM and jump to RAM?

Re: KEA128 Flash Erase and write problems

mjbcswitzerland — Mon, 16 Jul 2018 15:53:24 GMT

If you download the free uTasker open source project from GitHub you will have all code.

Here is a snippet to show you how a thumb 2 call can be created in SRAM to execute a routine (here fnFlashRotine())

static void (*fnRAM_code)(void) = 0;

        #define PROG_WORD_SIZE 30                                        // adequate space for the small program
        int i = 0;
        unsigned char *ptrThumb2 = (unsigned char *)fnFlashRoutine;
        static unsigned short usProgSpace[PROG_WORD_SIZE] = {0};         // make space for the routine in static memory (this will have an even boundary)

        ptrThumb2 =  (unsigned char *)(((CAST_POINTER_ARITHMETIC)ptrThumb2) & ~0x1); // thumb 2 address
        while (i < PROG_WORD_SIZE) {                                     // copy program to SRAM
            usProgSpace[i++] = *(unsigned short *)ptrThumb2;
            ptrThumb2 += sizeof (unsigned short);
        }
        ptrThumb2 = (unsigned char *)usProgSpace;
        ptrThumb2++;                                                     // create a thumb 2 call
        fnRAM_code = (void(*)(void))(ptrThumb2);
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and then can be executed with

fnRAM_code(); // execute the command in SRAM

Regards

Mark