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Eeprom or flash TM4c123gh6pmi7

VT
Genius 3300 points
Other Parts Discussed in Thread: TM4C123GH6PM

Hi,

I need to know which one to use flash or eeprom for data storage, since errata says in some condition device may get damaged or eeprom corrupted.
Refer to errate SPMZ849E. I am using rev 7 of TM4C.


A)Flash:
1. Only errata is MEM#14. Flash Write Operation During Execute from Flash may Result in Wrong Instruction
Fetch. I think workaround #1 will work for it in case system is running abobe 40Mhz.

SysCtlClockSet(SYSCTL_SYSDIV_5 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN | SYSCTL_XTAL_16MHZ ); /* slow down system to 40Mhz */
IntMasterDisable();  /* disable main int */
FlashErase(0x10000);
FlashProgram(pui32Data, 0x10000, sizeof(pui32Data));  
IntMasterEnable();
SysCtlClockSet(SYSCTL_SYSDIV_2_5 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN | SYSCTL_XTAL_16MHZ ); /* again go to 80Mhz */


2. Since flash has 1Kb block selectable. Suppose I want to have 2Kb of flash as eeprom. I am using two last blocks of flash.
So I will use address like
FlashErase(0x3F800); /* 256*1024 - 1024 - 1024 */
FlashErase(0x3FC00); /* 256*1024 - 1024 */

Is it right?


3. I am using keil. I have made setting Project->option for trget->target->IROM1-> 0 to 0x3F800.
This is to tell compiler that now put flash code upto 0x3F800.
Is it correct?


4. Another workaround to MEM#14 is to "Copy the Flash Program/Erase code to SRAM and CPU executes the code from
SRAM."
How to do that in code. Is there any example code to how to do this?



i am using TM4C123gh6pm, driverlib 2.1.1.71 , keil 5.13.0.0

  • 0
    TI__Guru**** 244400 points
    Hello VT

    With workarounds #1, #2 and #3, you do not need to have #4.

    Regards
    Amit
  • 0 in reply to Amit Ashara
    Genius 3300 points
    Hi Amit,

    1. I was asking if any example code on how to implement workaround#4 in case.
    2. What are these Non-volatile register programming? Are they inly FMPREx, USER_REG0 & BOOTCFG only?

    Thanks
  • 0 in reply to VT
    TI__Guru**** 244400 points
    Hello VT,

    1. We do not have a ready to use code for WA#4
    2. Yes, these are the NVM registers.

    Regards
    Amit
  • 0 in reply to Amit Ashara
    Genius 3300 points
    Hi Amit,

    I am using flash as eeprom & using last two 1KB block of flash for this.

    1. For erasing flash:
    SysCtlClockSet(SYSCTL_SYSDIV_5 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN | SYSCTL_XTAL_16MHZ ); /* go to 40Mhz */
    IntMasterDisable();
    FlashErase(0x3F800); /* 256*1024 - 1024 - 1024 , delete second last block */
    FlashErase(0x3FC00); /* 256*1024 - 1024, delete last block */
    IntMasterEnable();
    SysCtlClockSet(SYSCTL_SYSDIV_2_5 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN | SYSCTL_XTAL_16MHZ ); /* again go to 80Mhz */

    2. For programming flash
    SysCtlClockSet(SYSCTL_SYSDIV_5 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN | SYSCTL_XTAL_16MHZ ); /* go to 40Mhz */
    IntMasterDisable();
    FlashProgram(pui32Data, 0x3F800U, sizeof(pui32Data));
    FlashProgram(pui32Data, 0x3F800U + 8U, sizeof(pui32Data));
    FlashProgram(pui32Data, 0x3FC00U, sizeof(pui32Data));
    FlashProgram(pui32Data, 0x3FC00U + 8U, sizeof(pui32Data));
    IntMasterEnable();
    SysCtlClockSet(SYSCTL_SYSDIV_2_5 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN | SYSCTL_XTAL_16MHZ ); /* again go to 80Mhz */


    3. Are both these methods right.

    4. now how to read back the data from flash. i am using below method. Since I am reading from flah, so I think there is no need to slow down clock or disable master interrupt. Right? below is code. I have disabled slowing down of clock.

    // SysCtlClockSet(SYSCTL_SYSDIV_5 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN | SYSCTL_XTAL_16MHZ );
    // IntMasterDisable();
    pui32Read[0] = (*(uint32_t *)(0x3F800U));
    pui32Read[1] = (*(uint32_t *)(0x3F800U + 4U));
    pui32Read[0] = (*(uint32_t *)(0x3F800U + 8U));
    pui32Read[1] = (*(uint32_t *)(0x3F800U + 12U));
    // IntMasterEnable();
    // SysCtlClockSet(SYSCTL_SYSDIV_2_5 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN | SYSCTL_XTAL_16MHZ ); /* again go to 80Mhz */


    5. I have checked. Code is working,
  • 0 in reply to VT
    TI__Guru**** 244400 points
    Hello VT,

    All the steps are correct.

    Regards
    Amit