freescale K21这个函数传参怎么传啊？

Nialu

void uart_putchar (UART_MemMapPtr channel, char ch)
{
    /* Wait until space is available in the FIFO */
    while(!(UART_S1_REG(channel) & UART_S1_TDRE_MASK));
   
    /* Send the character */
    UART_D_REG(channel) = (uint8)ch;
 }
我传了一个 uart_putchar（UART0_BASE_PTR，‘a’）；怎么运行UART0_D寄存器的值没有变化呢？急求啊！！！！
 
 

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FSL_TICS_Robin

你可以看下K21的Reference Manual。
里面有关于UARTx_D寄存器的描述This register is actually two separate registers. Reads return the contents of the read-only
receive data register and writes go to the write-only transmit data register.