关于MSP430FR5994的UART问题

可以把配置代码发上来，才好看问题

你用的什么封装的5994？不是所有封装都引出了所有串口io 

uint8_t BLE_Init(uint16_t baudrate)
{
// Configure UART_BLE pins EUSCI_A2_BASE
//Set P5.4 and P5.5 as Secondary Module Function Input.
GPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_P5,GPIO_PIN4 + GPIO_PIN5,
GPIO_SECONDARY_MODULE_FUNCTION);

// Configure UART_BLE EUSCI_A2_BASE
EUSCI_A_UART_initParam param = {0};
param.selectClockSource = EUSCI_A_UART_CLOCKSOURCE_SMCLK;
param.clockPrescalar = 6;
param.firstModReg = 8;
param.secondModReg = 0;//92
param.parity = EUSCI_A_UART_NO_PARITY;
param.msborLsbFirst = EUSCI_A_UART_LSB_FIRST;
param.numberofStopBits = EUSCI_A_UART_ONE_STOP_BIT;
param.uartMode = EUSCI_A_UART_MODE;
param.overSampling = EUSCI_A_UART_OVERSAMPLING_BAUDRATE_GENERATION;

if(STATUS_FAIL == EUSCI_A_UART_init(UART_BLE, &param))
{
return 0 ;
}

EUSCI_A_UART_enable(UART_BLE);
EUSCI_A_UART_clearInterrupt(UART_BLE,EUSCI_A_UART_RECEIVE_INTERRUPT);
// Enable USCI_A2 RX interrupt EUSCI_A2_BASE
EUSCI_A_UART_enableInterrupt(UART_BLE,EUSCI_A_UART_RECEIVE_INTERRUPT); // Enable interrupt
// POWER_BLE On
POWER_BLE_On;
return 1;
}

voia main(void)
{
WDT_A_hold(WDT_A_BASE); // stop watchdog
// LFXT Setup
//Set PJ.4 and PJ.5 as Primary Module Function Input.
/*

* Select Port J
* Set Pin 4, 5 to input Primary Module Function, LFXT.
*/
GPIO_setAsPeripheralModuleFunctionInputPin( GPIO_PORT_PJ,GPIO_PIN4 + GPIO_PIN5,
GPIO_PRIMARY_MODULE_FUNCTION);

//Set DCO frequency to 1 MHz
CS_setDCOFreq(CS_DCORSEL_0,CS_DCOFSEL_0);
//Set external clock frequency to 32.768 KHz
CS_setExternalClockSource(32768,0);
//Set ACLK=LFXT
CS_initClockSignal(CS_ACLK,CS_LFXTCLK_SELECT,CS_CLOCK_DIVIDER_1);
//Set SMCLK = DCO with frequency divider of 1
CS_initClockSignal(CS_SMCLK,CS_DCOCLK_SELECT,CS_CLOCK_DIVIDER_1);
//Set MCLK = DCO with frequency divider of 1
CS_initClockSignal(CS_MCLK,CS_DCOCLK_SELECT,CS_CLOCK_DIVIDER_1);
//Start XT1 with no time out
CS_turnOnLFXT(CS_LFXT_DRIVE_0);//Start XT1 with no time out

__enable_interrupt();
while(1)
{
EUSCI_A_UART_transmitData(EUSCI_A2_BASE,*pTem++);//EUSCI_A2_BASE
__delay_cycles(1000);
}
}

同样的配置方法（UART口选择不一致，端口部分初始化不一样）在UART0，UART1都能正常收发数据，但用到UART2，UART3用示波器观察发送管脚没有信号输出，换了几块板测试都是这种情况