Hello Everyone,
1. I am working on three phase energy meter application with msp430 as Master and Ade7880 as slave using SPI communication.
2 . working on MCLK= 16 MHZ DCO clock and for peripheral we are used XTL2 = SMCLK =4 MHZ.
following thing are facing
scenario 1: Without AC supply and load. (current and voltage are zeros).Only supply Provides to MCU (3.3 V).
Whenever switching is doing ON to OFF Or OFF to ON , problem is not coming ,BUT
scenario 2: With AC supply and load.
Whenever switching is doing ON to OFF Or OFF to ON , microcontroller gets stuck on unexpected random locations
and sometimes stopping the cpu execution on do-while loop , library functions like printf, strstr functions.
It is stcuking at very small loads (15 Watt) .
Facing problem on scenario 2.
Is that clock issue or core voltage issue Or any other issue.
please check following code clock init and setting of core voltage.
//Clock Intialization ==> MCLK=16MHZ SMCLK=4MHZ ACLK=32KHZ
void clock_init()
{
SetVcoreUp(PMMCOREV_1);
SetVcoreUp(PMMCOREV_2); // Set VCore to 1.8v for 20MHz
P11DIR = BIT2 + BIT1 + BIT0; // P11.2,1,0 to output direction
P11SEL = BIT2 + BIT1 + BIT0; // P11.2 to output SMCLK, P11.1
// to output MCLK and P11.0 to
// output ACLK
P5SEL |= 0x0C; // Port select XT2
P7SEL |= 0x03; // Port select XT1
UCSCTL6 &= ~(XT1OFF + XT2OFF); // Set XT1 & XT2 On
UCSCTL6 |= XCAP_3; // Internal load cap
// Loop until XT1,XT2 & DCO stabilizes
do
{
UCSCTL7 &= ~(XT2OFFG + XT1LFOFFG + XT1HFOFFG + DCOFFG);
// Clear XT2,XT1,DCO fault flags
SFRIFG1 &= ~OFIFG; // Clear fault flags
}while (SFRIFG1&OFIFG); // Test oscillator fault flag
UCSCTL6 &= ~XT2DRIVE0; // Decrease XT2 Drive according to
UCSCTL3 |= SELREF_2; //SELREF__XT2CLK;//SELREF__XT2CLK ; //SELREF_5;
__bis_SR_register(SCG0); // Disable the FLL control loop
UCSCTL0 |=0x0000;
UCSCTL1|=DCORSEL_7;
UCSCTL2 |= FLLD_1 + 488;
__bic_SR_register(SCG0); // Disable the FLL control loop
__delay_cycles(500000); //settle DCO
UCSCTL4 |= SELA_2 + SELS_5 ;//+ SELM_3;
}
//Configured PMM control registers SVM,SVS Control registers
void SetVcoreUp (unsigned int level)
{
// Open PMM registers for write
PMMCTL0_H = PMMPW_H; //PMM password always 0x45 for writing and 0x96 for reading
// Set SVS/SVM high side new level
SVSMHCTL = SVSHE + SVSHRVL0 * level + SVMHE + SVSMHRRL0 * level;
// Set SVM low side to new level
SVSMLCTL = SVSLE + SVMLE + SVSMLRRL0 * level;
// Wait till SVM is settled
while ((PMMIFG & SVSMLDLYIFG) == 0);
// Clear already set flags
PMMIFG &= ~(SVMLVLRIFG + SVMLIFG);
// Set VCore to new level
PMMCTL0_L = PMMCOREV0 * level;
// Wait till new level reached
if ((PMMIFG & SVMLIFG))
while ((PMMIFG & SVMLVLRIFG) == 0);
// Set SVS/SVM low side to new level
SVSMLCTL = SVSLE + SVSLRVL0 * level + SVMLE + SVSMLRRL0 * level;
// Lock PMM registers for write access
PMMCTL0_H = 0x00;
}
Please help me to solve this stuck problem.
Regards,
Sanjay M.
