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标题: 107以太网DMA发送描述符问题 [打印本页]

作者: 以枫之名 时间: 2016-10-17 20:18
标题: 107以太网DMA发送描述符问题
本帖最后由以枫之名于 2016-10-17 20:22 编辑

描述符定义：

typedef struct _ETH_DMA_Desc
{
  unsigned int DES0;
  unsigned int DES1;
  unsigned int DES2;
  unsigned int DES3;
}ETH_DMA_Desc;

__align(4) ETH_DMA_Desc TxDes[2]；

单个描述符发送正常，代码：

void ETH_Tx_Des_Init(void)
{
int i;
TxDes[0].DES0 = (0<<31) |
                  (0<<30)       |
                  (1<<29)       |
                  (1<<28)       |
                  (0<<27)       |
                  (0<<26)       |
                  (0<<25)       |
                  (3<<22)       |
               (1<<21)       |
                  (1<<20)       ;
      TxDes[0].DES1 = 0;
      TxDes[0].DES2 = (unsigned int)TxBuffer[0];
      TxDes[0].DES3 = (unsigned int)&TxDes[1];

TxDes[1].DES0 = (0<<31) |
                  (0<<30)       |
                  (1<<29)       |
                  (1<<28)       |
                  (0<<27)       |
                  (0<<26)       |
                  (0<<25)       |
                  (3<<22)       |
                  (0<<21)       |
                  (1<<20)       ;
      TxDes[1].DES1 = 0;
      TxDes[1].DES2 = (unsigned int)TxBuffer[1];
      TxDes[1].DES3 = (unsigned int)&TxDes[0];

}

int ETH_Tx(unsigned char *Buffer,unsigned int Length)
{
unsigned int i;
if(!PhyLinkUp)
      return -1;
for(i = 0; i < 1; i++)
{
      if(!(TxDes.DES0 & ETH_DMATxDesc_OWN))
      {
         TxDes.DES1 = (Length & ETH_DMATxDesc_TBS1);
         Jmemcpy(TxBuffer, Buffer, Length);
         TxDes.DES0 |= ETH_DMATxDesc_OWN;
         break;
      }
}
if(ETH->DMASR & ETH_DMASR_TBUS)
{
      ETH->DMASR = ETH_DMASR_TBUS;
      ETH->DMATPDR = 0;
}

return 0;
}

以上代码正常工作，但当把描述符改为2个循环，即上面的代码不变，把第描述符的21位清零
void ETH_Tx_Des_Init(void)
{
int i;
TxDes[0].DES0 = (0<<31) |
                  (0<<30)       |
                  (1<<29)       |
                  (1<<28)       |
                  (0<<27)       |
                  (0<<26)       |
                  (0<<25)       |
                  (3<<22)       |
               (0<<21)       |
                  (1<<20)       ;
      TxDes[0].DES1 = 0;
      TxDes[0].DES2 = (unsigned int)TxBuffer[0];
      TxDes[0].DES3 = (unsigned int)&TxDes[1];

TxDes[1].DES0 = (0<<31) |
                  (0<<30)       |
                  (1<<29)       |
                  (1<<28)       |
                  (0<<27)       |
                  (0<<26)       |
                  (0<<25)       |
                  (3<<22)       |
                  (0<<21)       |
                  (1<<20)       ;
      TxDes[1].DES1 = 0;
      TxDes[1].DES2 = (unsigned int)TxBuffer[1];
      TxDes[1].DES3 = (unsigned int)&TxDes[0];

}

这样就不能正常工作了，抓包发现STM32没有发送成功，这是为什么？

作者: 以枫之名 时间: 2016-10-17 21:19
int ETH_Tx(unsigned char *Buffer,unsigned int Length)
{
unsigned int i;
if(!PhyLinkUp)
return -1;
printf("ETH->DMASR:%x\n\r",ETH->DMASR);
printf("TxDes[0].DES0:%x\n\r",TxDes[0].DES0);
printf("TxDes[0]:%x\n\r",(unsigned int)&TxDes[0]);
printf("ETH->DMATDLAR:%x\n\r",ETH->DMATDLAR);
......

一些调试信息

ETH->DMASR:660004
TxDes[0].DES0:30d00000
TxDes[0]:200009c8
ETH->DMATDLAR:200009c8

ETH->DMASR:670444
TxDes[0].DES0:30d00000
TxDes[0]:200009c8
ETH->DMATDLAR:200009c8

ETH->DMASR:670444
TxDes[0].DES0:b0d00000
TxDes[0]:200009c8
ETH->DMATDLAR:200009c8

ETH->DMASR:670444
TxDes[0].DES0:b0d00000
TxDes[0]:200009c8
ETH->DMATDLAR:200009c8

ETH->DMASR:660404
TxDes[0].DES0:b0d00000
TxDes[0]:200009c8
ETH->DMATDLAR:200009c8

作者: 以枫之名 时间: 2016-10-18 08:57
顶一下

作者: 正点原子 时间: 2016-10-18 21:30
帮顶

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