TI 的TM4CBE6PZ 串口6配置好了，但uartprintf函数无法使用？代码如下

#include
#include
#include
#include
#include
#include
#include
#include "../inc/hw_uart.h"
#include "../inc/hw_memmap.h"
#include "../inc/hw_types.h"
#include "../inc/hw_timer.h"
#include "../inc/hw_ints.h"
#include "../inc/hw_gpio.h"
#include "../inc/hw_i2c.h"
#include "../inc/hw_sysctl.h"
#include "../driverlib/timer.h"
#include "../driverlib/interrupt.h"
#include "../driverlib/sysctl.h"
#include "../driverlib/systick.h"
#include "../driverlib/gpio.h"
#include "../driverlib/pin_map.h"
#include "../driverlib/ssi.h"
#include "../driverlib/i2c.h"
#include "../driverlib/udma.h"
#include "../driverlib/fpu.h"
#include "../driverlib/rom.h"
#include "../driverlib/debug.h"
#include "../driverlib/flash.h"
#include "../driverlib/eeprom.h"

#include "../utils/uartstdio.h"
#include "../inc/hw_memmap.h"
#include "../user/eeprominit.h"
#include "../user/gpioinit.h"

void ConfigureUART(void)
{
// Enable UART6
//
SysCtlPeripheralEnable(SYSCTL_PERIPH_UART6);

//
// Configure GPIO Pins for UART mode.
//
GPIOPinConfigure(GPIO_PD4_U6RX);
GPIOPinConfigure(GPIO_PD5_U6TX);
GPIOPinTypeUART(GPIO_PORTD_BASE, GPIO_PIN_4 | GPIO_PIN_5);

//
// Initialize the UART for console I/O.
//
UARTStdioConfig(6, 115200, SysCtlClockGet());
}

void eeprominit(void)
{

     uint32_t pui32Data[2];
  uint32_t pui32Read[2];
pui32Data[0] = 0x12345678;
pui32Data[1] = 0x56789abc;

ConfigureUART();

UARTprintf("OK\n");

SysCtlPeripheralEnable(SYSCTL_PERIPH_EEPROM0);//
EEPROMInit();                                 //
EEPROMMassErase();                            //
EEPROMRead(pui32Read, 0x0, sizeof(pui32Read));//
EEPROMProgram(pui32Data, 0x0, sizeof(pui32Data));//
EEPROMRead(pui32Read, 0x0, sizeof(pui32Read));//

}

UARTStdioConfig(6, 115200, SysCtlClockGet());这个函数需要修改的

内部默认只能使用串口0，1，2。你进入到这个函数把范围扩大就可以了。