MSP430FR2311: MSP430FR2311

Mithilesh Chaubey

Prodigy 40 points

Part Number: MSP430FR2311

Tool/software:

I need to write some values on flash and later access it after power reset. Currently I am using this code:

#pragma PERSISTENT(x)
static volatile uint8_t x = 10u;

SYSCFG0 = FRWPPW;
x = y;
SYSCFG0 = FRWPPW | PFWP;

Is there some direct function to write to flash or it has to be done this way. The data is not written as I checked after reset it still holds the default value.

5 months ago

0 Bruce McKenney 5 months ago

Guru 100285 points

How do you tell that the data isn't written? More specifically: How are you issuing the reset? Persistent data is re-initialized when code is downloaded (it appears as a loadable section in the .out file).

This is the way to write FRAM. There is no separate "Data" (Information) FRAM on the FR2311, so you have to write-enable everything.

0 Mithilesh Chaubey 4 months ago in reply to Bruce McKenney

Prodigy 40 points

I am powering down the system for reset. When powered on the data is visualized using uart on the terminal. I still see the default value, not the set value at runtime.

0 Bruce McKenney 4 months ago in reply to Mithilesh Chaubey

Guru 100285 points

Could show some more context? I don't see anything obviously wrong with what you've posted.

I found that example msp430fr231x_framwrite_persistent.c functioned as expected. I tried both the reset button and power cycles. [I (a) changed the button pin from P1.2 to P1.1 to match the Launchpad (b) added "static volatile" to the Port_event" declaration just to make sure I wasn't missing anything.]

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MSP430FR2311: MSP430FR2311