MSP430FR5969 外部晶振量测不到信号

Other Parts Discussed in Thread: MSP430FR5969

使用MSP430FR5969 外部晶振（4M）量测不到输出clock，配置code如下：

void Init_Clock_exH(void)
{

// PJSEL0 |= BIT6 | BIT7; // For XT1 and XT2
GPIO_setAsPeripheralModuleFunctionInputPin(
GPIO_PORT_PJ,
GPIO_PIN6 + GPIO_PIN7,
GPIO_PRIMARY_MODULE_FUNCTION
);

// previously configured port settings
PM5CTL0 &= ~LOCKLPM5;

CS_setExternalClockSource(0, 4000000);

CS_turnOnHFXT(0);

// Set MCLK = DCO with frequency divider of 1
CS_initClockSignal(CS_MCLK, CS_HFXTCLK_SELECT, CS_CLOCK_DIVIDER_1);

// Set SMCLK = DCO with frequency divider of 1
CS_initClockSignal(CS_SMCLK, CS_HFXTCLK_SELECT, CS_CLOCK_DIVIDER_1);

}