采用485通讯，串口初始化如下，发送数据在串口调试助手中收不到数据，请问串口初始化哪里有问题？
#define UART0_Rx_Pin 0x0100
#define UART0_Tx_Pin 0x0200
#define UART0_RE_DE_Pin 0x0040
UART_DeInit(UART0);
/*Enable Clock for UART0*/
CFG_PeripheralClockConfig(CFG_CLK_UART0 , ENABLE);
/*Enable Clock for GPIO6*/
CFG_PeripheralClockConfig(CFG_CLK_GPIO6 , ENABLE);
/* CMU Initialization */
/*Configure CMU and switch to the external 4MHz Quartz*/
CMU_InitStruct.CMU_CKSEL0 = CMU_CKSEL0_CKOSC;
CMU_Init (&CMU_InitStruct);
/* Configure the GPIO pins as alternate function push pull*/
GPIO6_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO6_InitStruct.GPIO_Pins = UART0_Tx_Pin ;
GPIO_Init (GPIO6, &GPIO6_InitStruct);
GPIO6_InitStruct.GPIO_Mode = GPIO_Mode_IN_TRI_TTL;
GPIO6_InitStruct.GPIO_Pins = UART0_Rx_Pin;
GPIO_Init (GPIO6, &GPIO6_InitStruct);
GPIO6_InitStruct.GPIO_Mode = GPIO_Mode_OUT_PP;
GPIO6_InitStruct.GPIO_Pins = UART0_RE_DE_Pin ;
GPIO_Init (GPIO6, &GPIO6_InitStruct);
/* UART Configuration */
UART_StructInit(&UART_InitStruct); /*Initialize Structure with default values*/
UART_InitStruct.UART_BaudRate = 9600; /* Baud rate value */
UART_InitStruct.UART_Mode = UART_Mode_8D; /*Set the UARTx Mode 8 bit Data + Parity */
UART_InitStruct.UART_Loop_Standard = UART_Standard; /*Disable LoopBack*/
UART_InitStruct.UART_StopBits = UART_StopBits_1; /* STOP bits number */
//UART_InitStruct.UART_Parity = UART_Parity_Even; /* Parity bit */
UART_InitStruct.UART_Rx = UART_Rx_Enable;
UART_Cmd(UART0, ENABLE);
UART_Init(UART0, &UART_InitStruct); /*Configure Uart0*/
// UART_FifoReset(UART0,UART_TxFIFO);
//UART_FifoReset(UART0,UART_RxFIFO);
UART0_RE_DE_High(); //485发送使能
UART_ByteSend(UART0, 0xaa); //发送数据
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