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时钟树LPUART的时钟源宏定义

#define    FL_CMU_LPUART1_CLK_SOURCE_LSCLK                        (0x0U << CMU_OPCCR1_LPUART1CKS_Pos)
#define    FL_CMU_LPUART1_CLK_SOURCE_RCHF                         (0x1U << CMU_OPCCR1_LPUART1CKS_Pos)
#define    FL_CMU_LPUART1_CLK_SOURCE_RCLF                         (0x2U << CMU_OPCCR1_LPUART1CKS_Pos)


#define    FL_CMU_LPUART0_CLK_SOURCE_LSCLK                        (0x0U << CMU_OPCCR1_LPUART0CKS_Pos)
#define    FL_CMU_LPUART0_CLK_SOURCE_RCHF                         (0x1U << CMU_OPCCR1_LPUART0CKS_Pos)
#define    FL_CMU_LPUART0_CLK_SOURCE_RCLF                         (0x2U << CMU_OPCCR1_LPUART0CKS_Pos)


#define    FL_CMU_LPUART2_CLK_SOURCE_LSCLK                        (0x0U << CMU_OPCCR1_LPUART2CKS_Pos)
#define    FL_CMU_LPUART2_CLK_SOURCE_RCHF                         (0x1U << CMU_OPCCR1_LPUART2CKS_Pos)
#define    FL_CMU_LPUART2_CLK_SOURCE_RCLF                         (0x2U << CMU_OPCCR1_LPUART2CKS_Pos)

外设LPUART的时钟源宏定义

#define    FL_CMU_LPUART_CLK_SOURCE_LSCLK                         (0x0U)
#define    FL_CMU_LPUART_CLK_SOURCE_RCHF                          (0x1U)
#define    FL_CMU_LPUART_CLK_SOURCE_RCLF                          (0x2U)

所以双方都不能以自己选定的时钟源宏定义去修改对方的选定值，需要中间处理一下，添加数字或去掉数字。