MSP430F5325之全速跑问题

Stanford Chen

Prodigy 80 points

测试的程序使用官方的程序，将主频升至25M,然后循环外部的IO高低电平变化，断开了仿真器，程序直接运行，发现用不了几分钟就跑死了，IO无变化，将N调低，还是会出现跑死现象

11 年多前

0 Bruce Wei 11 年多前

TI__Mastermind 24987 points

楼主你好！

系统是怎么供电的？

试试下面的代码

void Drv_SetVcoreUp (UINT16_T level)
{
PMMCTL0_H = PMMPW_H; /* Open PMM registers for write */
SVSMHCTL = SVSHE + SVSHRVL0 * level + SVMHE + SVSMHRRL0 * level; /* Set SVS/SVM high side new level */
SVSMLCTL = SVSLE + SVMLE + SVSMLRRL0 * level; /* Set SVM low side to new level */

while ((PMMIFG & SVSMLDLYIFG) == 0); /* Wait till SVM is settled */

PMMIFG &= ~(SVMLVLRIFG + SVMLIFG); /* Clear already set flags */
PMMCTL0_L = PMMCOREV0 * level; /* Set VCore to new level */

if ((PMMIFG & SVMLIFG)) /* Wait till new level reached */
while ((PMMIFG & SVMLVLRIFG) == 0);

SVSMLCTL = SVSLE + SVSLRVL0 * level + SVMLE + SVSMLRRL0 * level; /* Set SVS/SVM low side to new level */
PMMCTL0_H = 0x00; /* Lock PMM registers for write access */
}

/*
*********************************************************************************************************
* Drv_UcsInit()
*
* Description : (1) TBD
*
* Argument(s) : none.
*
* Return(s) : none.
*
* Caller(s) : Application.
*
* Note(s) : (1) TBD
*********************************************************************************************************
*/

void Drv_UcsInit (void)
{
// Increase Vcore setting to level3 to support fsystem=25MHz
// NOTE: Change core voltage one level at a time..
Drv_SetVcoreUp (0x01);
Drv_SetVcoreUp (0x02);
Drv_SetVcoreUp (0x03);

UCSCTL3 = SELREF_2; // Set DCO FLL reference = REFO
UCSCTL4 |= SELA_2; // Set ACLK = REFO

__bis_SR_register(SCG0); // Disable the FLL control loop
UCSCTL0 = 0x0000; // Set lowest possible DCOx, MODx
UCSCTL1 = DCORSEL_7; // Select DCO range 50MHz operation
UCSCTL2 = FLLD_1 + 762; // Set DCO Multiplier for 25MHz
// (N + 1) * FLLRef = Fdco
// (762 + 1) * 32768 = 25MHz
// Set FLL Div = fDCOCLK/2
__bic_SR_register(SCG0); // Enable the FLL control loop

// Worst-case settling time for the DCO when the DCO range bits have been
// changed is n x 32 x 32 x f_MCLK / f_FLL_reference. See UCS chapter in 5xx
// UG for optimization.
// 32 x 32 x 25 MHz / 32,768 Hz ~ 780k MCLK cycles for DCO to settle
__delay_cycles(782000);

// Loop until XT1,XT2 & DCO stabilizes - In this case only DCO has to stabilize
do
{
UCSCTL7 &= ~(XT2OFFG + XT1LFOFFG + DCOFFG);
// Clear XT2,XT1,DCO fault flags
SFRIFG1 &= ~OFIFG; // Clear fault flags
}while (SFRIFG1&OFIFG); // Test oscillator fault flag
}