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Compiler/EK-TM4C123GXL: EK-TM4C123GXL

Andy Deng
Prodigy 180 points
Part Number: EK-TM4C123GXL

Tool/software: TI C/C++ Compiler

Hi all:

I had issue about RTC follow is my test
platform : EK-TM4C123GXL
RTOS:TI RTOS Tivac 2 16 00 08
IDE:
Code Composer Studio 7.3.0
XDCtools 3.32.0.06_core3
Compiler TI v16.9.4.LTS

void InitHibernation(void)
{
SysCtlPeripheralEnable(SYSCTL_PERIPH_HIBERNATE);
//
// Wait for the Hibernate module to be ready.
//
while(!SysCtlPeripheralReady(SYSCTL_PERIPH_HIBERNATE))
{
}
//
// Determine if the Hibernation module is active.
//

HibernateEnableExpClk(SysCtlClockGet());
// Configure the clock source for Hibernation module and enable the
// RTC feature.
//
HibernateClockConfig(HIBERNATE_OSC_HIGHDRIVE);
HibernateRTCEnable();
}

and i print the HibernateRTCGet() value to console.  Follow is my log. 

2018/5/23 17:22:30 [RX] - RTC:172 <CR><LF>

2018/5/24 09:20:25 [RX] - RTC:58329 <CR><LF>

58329 - 172 = 58157 = 16 h  09 m 17 s

 2018/5/23 17:22:30 + 16 h 09 m 17 s

= 2018/5/24 09:31:47

 over the actual time 11 m 22 s

Is any RTC register setting wrong? or need to be set?

Thank you.

  • 0
    Expert 1220 points

    Try using HibernateRTCSet(counter value). I think it should do the trick.

  • 0 in reply to Helder Sales
    Prodigy 70 points

    I think the question is why the RTC module is not accurate and how to improve it 

    register setting ?? or other??

  • 0 in reply to Jeff Leff
    Expert 1220 points

    Sorry, I confused some things, my bad. In that case, I would try to change HibernateClockConfig(HIBERNATE_OSC_HIGHDRIVE) to HibernateClockConfig(HIBERNATE_OSC_LOWDRIVE), although I believe the LP has 24pF filter capacitors.

    I've a code that use interrupts, in the case you want to verify if still have accuracy problems with it...

    uint32_t g_sec = 0;

void config_HibernateRTC(void)
{
    //set hibernate clock
    MAP_HibernateEnableExpClk(MAP_SysCtlClockGet());

    //TODO: Change to HIBERNATE_OSC_LOWDRIVE
    MAP_HibernateClockConfig(HIBERNATE_OSC_HIGHDRIVE);

    //set counter to 0
    MAP_HibernateRTCSet(0);

    //match = 0 when hibernate counter reaches 1
    HibernateRTCMatchSet(0, MAP_HibernateRTCGet() + 1);

    //deactivate and clear interrupts
    MAP_IntDisable(INT_HIBERNATE);
    MAP_HibernateIntDisable(HIBERNATE_INT_RTC_MATCH_0);
    MAP_IntPendClear(INT_HIBERNATE);
    MAP_HibernateIntClear(HIBERNATE_INT_RTC_MATCH_0);

    //generate interrupt when match = 0
    //enable interrupts
    MAP_HibernateIntEnable(HIBERNATE_INT_RTC_MATCH_0);
    MAP_IntEnable(INT_HIBERNATE);
    
    MAP_HibernateRTCEnable();
}

void HibernateRTCIntHandler(void)
{
    //clear interrupt
    MAP_HibernateIntClear(HIBERNATE_INT_RTC_MATCH_0);

    g_sec++;

    //reset counter
    MAP_HibernateRTCSet(0);
}