cc2430 DMA设立

2012-12-19

cc2430 DMA设置typedef __xdata struct{unsigned char SRCADDRH//源地址高8位unsigned char SRCADDRL//

cc2430 DMA设置
typedef __xdata struct
{
  unsigned char SRCADDRH;           //源地址高8位
  unsigned char SRCADDRL;           //源地址低8位
  unsigned char DESTADDRH;          //目的地址高8位
  unsigned char DESTADDRL;          //目的地址低8位
  unsigned char VLEN        :3;     //长度域模式选择
  unsigned char LENH        :5;     //传输长度高字节
  unsigned char LENL        :8;     //传输长度低字节
  unsigned char WORDSIZE    :1;     //字节（byte）或字（word）传输
  unsigned char TMODE       :2;     //传输模式选择
  unsigned char TRIG        :5;     //触发事件选择
  unsigned char SRCINC      :2;     //源地址增量：-1/0/1/2
  unsigned char DESTINC     :2;     //目的地址增量：-1/0/1/2
  unsigned char IRQMASK     :1;     //中断屏蔽
  unsigned char M8          :1;     //7或8bit传输长度，仅在字节传输模式下适用
  unsigned char PRIORITY    :2;     //优先级
}DMA_CFG;

//实验说明：将字符数组sourceString的内容通过DMA传输到字符数组destString中，转换结果通过串口显示到PC上。

void main(void)//
{
  DMA_CFG dmaConfig;       //定义配置结构体

  unsigned char sourceString[]="I'm the sourceString!\r\n";      //源字符串
  unsigned char destString[sizeof(sourceString)]="I'm the destString!\r\n";  //目的字符串

  InitLed();
  initUARTtest();

  UartTX_Send_String(sourceString);         //传输前的原字符数组
  UartTX_Send_String(destString);           //传输前的目的字符数组

   //配置DMA结构体
  dmaConfig.SRCADDRH=(unsigned char)((unsigned short int)&sourceString >> 8);     //源地址
  dmaConfig.SRCADDRL=(unsigned char)((unsigned short int)&sourceString);

  dmaConfig.DESTADDRH=(unsigned char)((unsigned short int)&destString >> 8);      //目的地址
  dmaConfig.DESTADDRL=(unsigned char)((unsigned short int)&destString);

  dmaConfig.VLEN=0x00;         //选择LEN作为传送长度

  dmaConfig.LENH=(unsigned char)((unsigned short int)sizeof(sourceString) >> 8);  //传输长度
  dmaConfig.LENL=(unsigned char)((unsigned short int)sizeof(sourceString));

  dmaConfig.WORDSIZE=0x00;     //选择字节（byte）传送

  dmaConfig.TMODE=0x01;        //选择块传送（block）模式

  dmaConfig.TRIG=0;            //无触发(可以理解为手动触发）

  dmaConfig.SRCINC=0x01;       //源地址增量为1

  dmaConfig.DESTINC=0x01;      //目的地址增量为1

  dmaConfig.IRQMASK=0;         //DMA中断屏蔽

  dmaConfig.M8=0x00;           //选择8位长的字节来传送数据

  dmaConfig.PRIORITY=0x02;     //传输优先级为高


  DMA0CFGH=(unsigned char)((unsigned short int)&dmaConfig >> 8);   //将配置结构体的首地址赋予相关SFR
  DMA0CFGL=(unsigned char)((unsigned short int)&dmaConfig);

  DMAARM=0x01;                 //启用配置  使DMA进入工作状态

  DMAIRQ=0x01;                 //清中断标志

  DMAREQ=0x01;                 //启动DMA传输

  while(!(DMAIRQ&0x01));                //等待传输结束
}阻塞到 while(!(DMAIRQ&0x01));      请求高手讲解
[解决办法]
帮忙顶起来。

热点排行

Wireless

cc2430 DMA设立