我从资料中看到有FIFO触发级别的，分别是1Byte,2,4,8,16...但是NUC029LAN的库函数好像没有关于这个的函数啊，是不是不支持FIFO级别触发？
寄存器的代码定义如下，但是没找到相关的函数：
- /*---------------------------------------------------------------------------------------------------------*/
- /* UA_FCR constants definitions */
- /*---------------------------------------------------------------------------------------------------------*/
- #define UART_FCR_RFITL_1BYTE (0x0 << UART_FCR_RFITL_Pos) /*!< UA_FCR setting to set RX FIFO Trigger Level to 1 byte */
- #define UART_FCR_RFITL_4BYTES (0x1 << UART_FCR_RFITL_Pos) /*!< UA_FCR setting to set RX FIFO Trigger Level to 4 bytes */
- #define UART_FCR_RFITL_8BYTES (0x2 << UART_FCR_RFITL_Pos) /*!< UA_FCR setting to set RX FIFO Trigger Level to 8 bytes */
- #define UART_FCR_RFITL_14BYTES (0x3 << UART_FCR_RFITL_Pos) /*!< UA_FCR setting to set RX FIFO Trigger Level to 14 bytes */
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