S32k144的PIT配置问题

烟雨梦 · 发表于 2018-1-19 17:41:32

开发环境IAR7.6，S32K144-100pin的片子，配置PIT的代码如下：在线调试的时候程序运行LPIT0->CLRTEN |= (1 << pitn);这句后就挂掉了，请问PIT配置哪里还有问题？

void pit_init(PITn pitn, uint32_t cnt)
{
uint32_t n ;

PCC->PCCn[PCC_LPIT_INDEX] &= ~PCC_PCCn_CGC_MASK;
PCC->PCCn[PCC_LPIT_INDEX] = PCC_PCCn_PCS(2);//选择内部SIRC作为时钟源 8M
PCC->PCCn[PCC_LPIT_INDEX]  |= PCC_PCCn_CGC_MASK ; //BUSCLK //使能PIT时钟

LPIT0->MCR |= (LPIT_MCR_M_CEN_MASK | LPIT_MCR_DOZE_EN_MASK | LPIT_MCR_DBG_EN_MASK );    //使能PIT定时器时钟，调试模式下继续运行

LPIT0->CLRTEN |= (1 << pitn)；//程序运行这句后挂掉了
LPIT0->SETTEN |= (1 << pitn);

/* 定时器加载值设置 Timer Load Value Register (PIT_LDVALn) */
LPIT0->TMR[0].TVAL  = cnt;
LPIT0->TMR[0].TCTRL |= LPIT_TMR_TCTRL_MODE(1) ;
n = LPIT0->TMR[0].CVAL ;
while((n &(0xffff0000)))
{
n = LPIT0->TMR[0].CVAL ;
};
LPIT0->TMR[0].TCTRL &= ~LPIT_TMR_TCTRL_MODE(3) ;

LPIT0->TMR[0].TCTRL |= 0
|LPIT_TMR_TCTRL_T_EN_MASK
//|LPIT_TCTRL0_CHAIN_MASK
|LPIT_TMR_TCTRL_MODE(0)
//|LPIT_TCTRL0_TSOT(1)
// |LPIT_TCTRL0_TSOI(0)
|LPIT_TMR_TCTRL_TROT(1)
|LPIT_TMR_TCTRL_TRG_SRC(1)
|LPIT_TMR_TCTRL_TRG_SEL(0)
;

LPIT0->MIER|= 1<< pitn ;    //打开定时器

//定时时间到了后，TIF 置 1 。写1的时候就会清0
//PIT_Flag_Clear(pitn); //清中断标志位
NVIC_EnableIRQ(pitn + (LPIT0_Ch0_IRQn));

}