W601 裸机配置串口 1 可以发送数据但是不能接受数据

下面是我写的代码, 初始化后可以发送数据, 但是一直不进接受中断
`void uart1_init (u32 bound)
{

u32 bd; 
u32 apbclk; 
tls_sys_clk sysclk; 

/* 1. 配置 IO */
wm_uart1_tx_config (WM_IO_PB_12) ; 
wm_uart2_rx_config (WM_IO_PB_11) ; 

/* 2. 波特率设置: 
    ubdiv =  (apbclk /  (16 * bound)  - 1) 
    ubdiv_frac =  ( (apbclk %  (bound * 16) )  /  (bound) )  */
tls_sys_clk_get (&sysclk) ; 
apbclk = sysclk. apbclk * 1000000; 
bd =  (apbclk /  (16 * bound)  - 1)  |  ( ( (apbclk %  (bound * 16) )  /  (bound) )   " " 16) ; 
tls_reg_write32 (HR_UART0_BAUD_RATE_CTRL,  bd) ; 

/* 2. 串口参数设置:  8 位数据位/1 位停止位/无奇偶校验位/发送使能/接收使能 */
tls_reg_write32 (HR_UART1_LINE_CTRL,  ULCON_WL8 | ULCON_TX_EN | ULCON_RX_EN) ; 
/* 3. 硬件流控关闭 */
tls_reg_write32 (HR_UART1_FLOW_CTRL,  0) ; 
/* 3. 不使能 DMA */
tls_reg_write32 (HR_UART1_DMA_CTRL,  0) ; 
/* 4. FIFO 触发设置:  1 个字节 */
tls_reg_write32 (HR_UART1_FIFO_CTRL,  0) ; 
/* 5. 开启 RX 中断: 接收触发中断和接收超时中断*/
tls_reg_write32 (HR_UART1_INT_MASK,  0xFF &  (~ (UIS_RX_FIFO | UIS_RX_FIFO_TIMEOUT) ) ) ; 

/* 6. 串口接收中断配置 */
NVIC_ClearPendingIRQ (UART1_IRQn) ; 

NVIC_InitTypeDef NVIC_InitStruct; 
NVIC_InitStruct. NVIC_IRQChannel = UART1_IRQn; 
NVIC_InitStruct. NVIC_IRQChannelPreemptionPriority = 7; 
NVIC_InitStruct. NVIC_IRQChannelSubPriority = 0; 
NVIC_InitStruct. NVIC_IRQChannelCmd = ENABLE; 
NVIC_Init (&NVIC_InitStruct) ; 
    

}
void UART1_IRQHandler (void)
{

tls_reg_write32 (HR_UART1_TX_WIN, '1') ; 
tls_reg_write32 (HR_UART1_TX_WIN, '\r') ; 
tls_reg_write32 (HR_UART1_TX_WIN, '\n') ; 

if (tls_reg_read32 (HR_UART1_INT_SRC)  & UIS_RX_FIFO)     //接收到数据
{
     USART1_RX_BUF[USART1_RX_STA] =   (u8) tls_reg_read32 (HR_UART1_RX_WIN) ; 
     USART1_RX_STA++; 
    tls_reg_write32 (HR_UART1_INT_SRC,  UIS_RX_FIFO) ;         //清除状态标志位
}    

}
`

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