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bobasaurus

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  1. bobasaurus

    RTC_C setup problem on the MSP430F6726 using CrossStudio

    A coworker helped me solve this problem. It turns out that the AUXVCC3 pin needs to be powered for the RTC to work, otherwise it's not clocked at all. There's a battery connector attached to the pin on my board, but I neglected to attach the battery during testing. Plugging in the battery makes the code above work perfectly. Hopefully this will help if anyone else runs into the issue.
  2. Hi folks. I'm fairly new to MSP430 development, though I've tinkered with AVRs for many years previously. Currently I'm working on a board that needs to use the onboard RTC_C module on the MSP430F6726 (using the Rowley CrossWorks/CrossStudio IDE). I've read through the user guide's RTC_C section thoroughly and written many variations of the setup code, including copying and pasting the official example (MSP430F673X_RTC_01.c)... I can't get it to count or fire RTCRDY interrupts no matter what I do. Below is my simple test code, which should toggle an LED on P5.2 every second (but doesn't work). Note that I have a 32.768 KHz watch crystal on XT1. #include <__cross_studio_io.h> #include <msp430.h> #include <inmsp.h> // initialize main clock sources // MCLK = 19.6608 MHz (about the max speed I can get without tweaking other chip settings) // SMCLK = 4.9152 MHz // ACLK = 32.768 KHz void SetupClock(void) { UCSCTL3 = 0; // FLL uses XT1CLK (default) UCSCTL4 = 0+ // ACLK = XT1CLK = 32.768 KHz SELS1+SELS0+ // SMCLK = DCOCLK SELM1+SELM0; // MCLK = DCOCLK UCSCTL5 = DIVS1; // SMCLK = DCOCLK/4 UCSCTL6 = XT2OFF | XCAP0 | XCAP1; // turn off XT2, 12pF load capacitance on XT1 _BIS_SR(SCG0); // disable the FLL control loop //__bis_SR_register(SCG0); // (alternate way of disabling FLL control loop) UCSCTL0 = 0; // setup for 13 MHz UCSCTL1 = DCORSEL_5; UCSCTL2 = 599; // FLL multiplier; DCOCLK = (599+1)*REFOCLK = 19.6608 MHz _BIC_SR(SCG0); // enable the FLL control loop __delay_cycles(250000); // wait for DCO to settle // Loop until XT1, XT2 & DCO fault flag is cleared do { UCSCTL7 &= ~(XT2OFFG | XT1LFOFFG | DCOFFG); // Clear XT2,XT1,DCO fault flags SFRIFG1 &= ~OFIFG; // Clear fault flags } while (SFRIFG1 & OFIFG); // Test oscillator fault flag } void RTCISR(void) __interrupt[RTC_VECTOR] { unsigned int rtcivBackup; rtcivBackup = RTCIV; //RTC ready if (rtcivBackup == RTCIV_RTCRDYIFG) { //toggle LED P5OUT ^= BIT2; } } void SetupRTC(void) { //unlock the rtc registers RTCCTL0_H = RTCKEY_H; //enable the rtc ready interrupt RTCCTL0_L = RTCRDYIE_L; //setup the calendar registers RTCYEAR = 2013; RTCMON = 7; RTCDAY = 24; RTCDOW = 3; RTCHOUR = 13; RTCMIN = 45; RTCSEC = 0; //clear the prescale counters RT0PS = 0; RT1PS = 0; //calendar mode RTCCTL13_L |= RTCMODE_L; //unhold the rtc RTCCTL13_L &= ~RTCHOLD_L; //lock the RTC registers again RTCCTL0_H = 0; } int main(void) { WDTCTL = WDTPW | WDTHOLD; // Stop watchdog timer SetupClock(); //setup output LED P5DIR |= BIT2; //start with LED off P5OUT |= BIT2; SetupRTC(); //enable general interrupts _BIS_SR(GIE); while(1) {} return 0; } Any suggestions on how I can make it work? The code should also work with CCS if you change the RTCISR function definition. Thanks for the help, I'm really stuck on this problem.
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