44b0串口编程

①串口的编程很简单，设置好四个引脚就好了

rPCONE |= (2<<2)|(2<<4); //rxd txd

           //rPCONE |= (0x01<<2)|(0x01<<4); //rxd txd 第一次竟然写成了这个

           rPDATG &= ~BIT1; //RTS 为0请求接收；

           rPCONG |= (1<<2);

这样串口就能通讯了

②中断方式发送数据
    设置要点：串口寄存器，中断寄存器，中断函数

rULCON0=0x3; //Normal,No parity,1 stop,8 bit

    rUCON0=0x045; //0000,0100,0101。rx=edge,tx=level,disable timeout int.,enable rx error int.,normal,interrupt or polling


Uart_Printf("\nTest begin:!");
uart0TxStr="UART0 Tx interrupt test is good!!!!\r\n";

pISR_UTXD0 = (unsigned)Uart0_TxInt;
rINTCON = 0;
rINTMSK =~ (BIT_GLOBAL|BIT_UTXD0);
rINTMOD = 0;

 

③DMA方式发送数据
    设置要点：串口寄存器，DMA寄存器

rUCON0 = 0x245; //for BDMA0


Uart_Printf("\n[Uart0 Tx Test by BDMA0]\n");
uart0TxStr="UART0 Tx Test by BDMA0 is good!!!!\r\n";
//Uart_TxEmpty(0);


rUCON0=0x48; //tx:BDMA0 rx:disable


rBDICNT0=0x0;
rBDCON0 =0x0;
rBDISRC0=(unsigned int)uart0TxStr|(0<<30)|(1<<28); // byte,inc

rBDIDES0=UTXH0 |(1<<30)|(3<<28); //L/B endian,M2IO,fix

rBDICNT0=strlen((char *)uart0TxStr)|(2<<30)|(1<<26)|(0<<20); //UART0,

rBDICNT0 |= (1<<20); //enable

rBDCON0 = (0x0<<2);