tm4c123gxl芯片关于uart问题

我使用keil开发，用例程中的uart_echo，可以实现uart0收发数据。

但是，我想通过引脚进行串口传输，选择uart3，但是为什么只能发，不能收。

void
UARTIntHandler(void)
{
uint32_t ui32Status;

//
// Get the interrrupt status.
//
ui32Status = ROM_UARTIntStatus(UART3_BASE, true);

//
// Clear the asserted interrupts.
//
ROM_UARTIntClear(UART3_BASE, ui32Status);
//
// Loop while there are characters in the receive FIFO.
//
GsmRcvCnt = 0;
while(ROM_UARTCharsAvail(UART3_BASE))
{
//
// Read the next character from the UART and write it back to the UART.
//

ROM_UARTCharPutNonBlocking(UART3_BASE,
ROM_UARTCharGetNonBlocking(UART3_BASE));

//
// Blink the LED to show a character transfer is occuring.
//
GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_2, GPIO_PIN_2);

//
// Delay for 1 millisecond. Each SysCtlDelay is about 3 clocks.
//
SysCtlDelay(SysCtlClockGet() / (1000 * 3));

//
// Turn off the LED
//
GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_2, 0);

}
}

int
main(void)
{
//
// Enable lazy stacking for interrupt handlers. This allows floating-point
// instructions to be used within interrupt handlers, but at the expense of
// extra stack usage.
//
ROM_FPUEnable();
ROM_FPULazyStackingEnable();

//
// Set the clocking to run directly from the crystal.
//
ROM_SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN |
SYSCTL_XTAL_16MHZ);

//
// Enable the GPIO port that is used for the on-board LED.
//
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);

//
// Enable the GPIO pins for the LED (PF2).
//
ROM_GPIOPinTypeGPIOOutput(GPIO_PORTF_BASE, GPIO_PIN_2);

//
// Enable the peripherals used by this example.
//
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_UART3);
ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOC);

//
// Enable processor interrupts.
//
ROM_IntMasterEnable();

//
// Set GPIO A0 and A1 as UART pins.
//
GPIOPinConfigure(GPIO_PC6_U3RX);
GPIOPinConfigure(GPIO_PC7_U3TX);
ROM_GPIOPinTypeUART(GPIO_PORTC_BASE, GPIO_PIN_6 | GPIO_PIN_7);

//
// Configure the UART for 115,200, 8-N-1 operation.
//
ROM_UARTConfigSetExpClk(UART3_BASE, ROM_SysCtlClockGet(), 115200,
(UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE |
UART_CONFIG_PAR_NONE));

//
// Enable the UART interrupt.
//
ROM_IntEnable(INT_UART3);
ROM_UARTIntEnable(UART3_BASE, UART_INT_RX | UART_INT_RT);

//
// Prompt for text to be entered.
//
//UARTSend((uint8_t *)"TEST ", 16);
tcptest();     //自己写的功能函数
//
// Loop forever echoing data through the UART.
//
// while(1)
// {
// }
}

gaoyang9992006：

我看楼主已经问题解决了，是因为在中断使用了延时吗？一般中断里最好不要使用延时，而且建议能使用判断代替延时的就使用判断，这样更加可以体现芯片的性能。