MSP430FR6989: A question about the device library

Hi,

Let me look into this.

Waiting for your reply，thanks

I apologize for taking some time to try to locate an explanation for this behavior.  Unfortunately, I couldn't track down anyone who knows the history of changes to the driverlib as far back as 2.00.00.16.  I did mange to find in the release notes one comment about fixing a "return value of 0". 

I compiled the two versions of the function and took a look at the disassembly.  Functionally, it would appear they do the same (wait until ESICNT3 does not equal 1.

So when the code appears to hang and you pause the debugger, what assembly line is the PC?  Maybe take a screen shot?  Can you open the register view to examine the ESICNT3 register and see what the value is?

This is how to upload pictures, using 2.91.13.01 ESICNT3= 0x00DE.Unable to exit the loop.

2.00.00.16 ESICNT3 x0093 = 0.It can exit the loop

2.91.13.01 returns "temp". "temp" is only assigned by ESICNT3 in the "do while".     2.00.00.16 is a direct output of ESICNT3

You can burn the program on the development board and debug it。

I did in fact test both versions and both did not hang.  Here is the code I used.

#include "driverlib.h"
#include <stdint.h>

    uint16_t measureESIOSC(void);
    uint16_t measureESIOSC_OLD(void);
int main(void) {

    WDT_A_hold(WDT_A_BASE);

    PM5CTL0 &= ~LOCKLPM5;
    P1DIR = BIT0;
    P1OUT = 0; // OFF LED

    measureESIOSC();
    measureESIOSC_OLD();

    P1OUT |= BIT0; // TURN ON LED TO SHOW CODE MADE IT ALL THE WAY
    while(1);
}

// This is in 2.91.13.01 (Latest version)
 uint16_t measureESIOSC(void)

 {

     uint16_t temp;

     // This and next instruction realizes a clear->set ESICLKGON bit.
     ESIOSC &= ~(ESICLKGON);

     // This starts measurement.
     ESIOSC |= ESICLKGON + ESIHFSEL;

     _no_operation();

     // Get counter value, when measurement has not finished yet, ESICNT3
     // value is 0x01
     do
     {
         temp = ESICNT3;
     } while(temp == 0x01);

     // Stop ESIOSC oscillator
     ESIOSC &= ~(ESICLKGON);

     // returns counter value ESICNT3
     return temp;
 }


 //This is in  2.00.00.16
 uint16_t measureESIOSC_OLD(void){

     //uint16_t temp;

     // This and next instruction realizes a clear->set ESICLKGON bit.
     ESIOSC &= ~(ESICLKGON);

     // This starts measurement.
     ESIOSC |= ESICLKGON + ESIHFSEL;

     // Get counter value, when measurement has not finished yet, ESICNT3
     // value is 0x01
     while(ESICNT3==1);

     // Stop ESIOSC oscillator
     ESIOSC &= ~(ESICLKGON);

     // returns counter value ESICNT3
     return (ESICNT3);
 }