MSP432的uart口是直接与调试器连接的：
其实我们可以直接用调试器的usb口当做串口用，使用的就是P1.2和P1.3，并不需要额外接线，非常方便。
直接借用TI官方提供的列子，主程序如下：
- int main(void)
- {
- WDT_A->CTL = WDT_A_CTL_PW | // Stop watchdog timer
- WDT_A_CTL_HOLD;
- clk_init();//clk init
- uart_init();//uart init,9600
- while(1)
- {
- send_str((uint8_t *)"uart test...\r\n");
- for(int i=0;i<10000;i++)
- {;}
- }
- }
串口初始化：
- void uart_init(void)
- {
- // Configure UART pins
- P1->SEL0 |= BIT2 | BIT3; // set 2-UART pin as secondary function
- // Configure UART
- EUSCI_A0->CTLW0 |= EUSCI_A_CTLW0_SWRST; // Put eUSCI in reset
- EUSCI_A0->CTLW0 = EUSCI_A_CTLW0_SWRST | // Remain eUSCI in reset
- EUSCI_B_CTLW0_SSEL__SMCLK; // Configure eUSCI clock source for SMCLK
- // Baud Rate calculation
- // 12000000/(16*9600) = 78.125
- // Fractional portion = 0.125
- // User's Guide Table 21-4: UCBRSx = 0x10
- // UCBRFx = int ( (78.125-78)*16) = 2
- EUSCI_A0->BRW = 78; // 12000000/16/9600
- EUSCI_A0->MCTLW = (2 << EUSCI_A_MCTLW_BRF_OFS) |
- EUSCI_A_MCTLW_OS16;
- EUSCI_A0->CTLW0 &= ~EUSCI_A_CTLW0_SWRST; // Initialize eUSCI
- EUSCI_A0->IFG &= ~EUSCI_A_IFG_RXIFG; // Clear eUSCI RX interrupt flag
- EUSCI_A0->IE |= EUSCI_A_IE_RXIE; // Enable USCI_A0 RX interrupt
- // Enable global interrupt
- __enable_irq();
- // Enable eUSCIA0 interrupt in NVIC module
- NVIC->ISER[0] = 1 << ((EUSCIA0_IRQn) & 31);
- }
字符串发送函数：
- void send_str(uint8_t *str)
- {
- while(*str!='\0')
- {
- // Check if the TX buffer is empty first
- while(!(EUSCI_A0->IFG & EUSCI_A_IFG_TXIFG));
- // Echo the received character back
- EUSCI_A0->TXBUF = *str;
- str++;
- }
- }
测试结果：
串口测试ok
| 
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