MSP430FR5994: FRAM cannot be written

Ben Qin

Intellectual 2690 points

Part Number: MSP430FR5994
Other Parts Discussed in Thread: MSP430FR5969

Hi Team,

There's an issue from the customer need your help:

I want to write data at specific area in FRAM.

I defined the start address:

#if defined (__TI_COMPILER_VERSION__)
#pragma PERSISTENT(FRAM_TEST_START)
uint32_t FRAM_TEST_START =
#elif defined (__IAR_SYSTEMS_ICC__)
__persistent uint32_t FRAM_TEST_START =
#elif defined (__GNUC__)
__attribute__ ((section (".persistent"))) uint32_t FRAM_TEST_START =
#endif
0x5500;

then start to write:

uint32_t * FRAMCtl_A_Memory32 (uint32_t *value,uint32_t *framPtr,uint16_t count)
{
uint16_t i=0;
while (count> 0)
{
*framPtr = i;
i++;
count--;
framPtr++;
}
return framPtr;
}

then I found the register value doesn't change.

also in TI's example it doesn't change too.

I checked TI's example on msp430fr5969 and I found it doesn't change too.

Could you help check this case?

Best Regards,

Ben

over 3 years ago

0 Johnson He over 3 years ago

TI__Mastermind 30016 points

Hi Ben,

Have you tried this example code?

https://dev.ti.com/tirex/explore/node?node=A__AAkb-Bq6Hd25qRBlFc08Zw__msp430ware__IOGqZri__LATEST

And FR599x have MPU unit, this can protect FRAM, thus you need to enable FRAM Write.

Thanks!

Best Regards

Johnson

0 Ben Qin over 3 years ago in reply to Johnson He

TI__Intellectual 2690 points

Hi Johnson,

I used this example:

https://dev.ti.com/tirex/explore/node?node=A__AAe0Ws-RWfV8h3qYwNEJ4g__msp430ware__IOGqZri__LATEST

It runs ok but the value of address 0xcaba doesn't change.

it suppose to change right?

Best Regards,

Ben

0 Johnson He over 3 years ago in reply to Ben Qin

TI__Mastermind 30016 points

Hi Ben,

Try this code:

https://dev.ti.com/tirex/explore/node?node=A__AC6uPtH6.vY0oNFmUc9XTg__msp430ware__IOGqZri__LATEST

Thanks!

Best Regards

Johnson

0 Ben Qin over 3 years ago in reply to Johnson He

TI__Intellectual 2690 points

Hi Johnson,

I tried and it worked well. But it starts at 0x4400, customer wants it change at specific area like starts at 0x5500. What should I do?

Best Regards,

Ben

0 Johnson He over 3 years ago in reply to Ben Qin

TI__Mastermind 30016 points

Hi Ben,

This document maybe can help you.

https://www.ti.com/lit/an/slaa628b/slaa628b.pdf

Thanks!

Best Regards

Johnson

0 Ben Qin over 3 years ago in reply to Johnson He

TI__Intellectual 2690 points

Hi Johnson,

Thanks for the help.

Define the persistent method I know it can be written in, but the address seems to be assigned by the system, and I want to write to my own fixed location. I see that the GUI defines the FRAM read and write permissions, and I changed it, but I can't get an error, and it triggers an interrupt. Don't know why. I also looked up a __MPU_init function, and I don't know where it is.

Best Regards

Ben

0 Johnson He over 3 years ago in reply to Ben Qin

TI__Mastermind 30016 points

Hi Ben,

You can follow this method to define your variable into fixed address:

The document I provide -> Chapter 3.4.1.3

Thanks!

Best Regards

Johnson

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MSP430FR5994: FRAM cannot be written