NUC970 CAN接收任意ID的数据

只看该作者 · 2021-3-25 14:30

1、NUC970 裸机程序2、怎样配置CAN的寄存器，使CAN通信能够接收任意ID的数据包。
谢谢！

只看该作者 · 2021-3-25 16:43

The Message Objects and Identifier Masks for acceptance filtering of received messaged in the Message RAM.

https://github.com/OpenNuvoton/NUC970_NonOS_BSP/tree/master/SampleCode/CAN

int32_t CAN_SetRxMsgObj(UINT32  uCAN, uint8_t u8MsgObj, uint8_t u8idType, uint32_t u32id, uint8_t u8singleOrFifoLast)
{
UINT32 uOffset = uCAN * CAN_OFFSET;

if((inpw(REG_CAN0_IF2_CREQ+uOffset) & CAN_IF_CREQ_BUSY_Msk) != 0)
{
      return FALSE;
}

/* Command Setting */
outpw((REG_CAN0_IF2_CMASK+uOffset), (CAN_IF_CMASK_WRRD_Msk | CAN_IF_CMASK_MASK_Msk | CAN_IF_CMASK_ARB_Msk |
                                       CAN_IF_CMASK_CONTROL_Msk | CAN_IF_CMASK_DATAA_Msk | CAN_IF_CMASK_DATAB_Msk));

if (u8idType == CAN_STD_ID) /* According STD/EXT ID format,Configure Mask and Arbitration register */
{
      outpw((REG_CAN0_IF2_ARB1+uOffset), 0x0);
      outpw((REG_CAN0_IF2_ARB2+uOffset), (CAN_IF_ARB2_MSGVAL_Msk | (u32id & 0x7FF)<< 2)); /* Identifier Masks */    /*  参考　ＮＵＣ９７０　Technical Reference Manual Page 824.  CAN_IFn_ARB2, Bit 15, 0 = The Message Object is ignored by the Message Handler
         当把第１５位配置成０，将会忽略指定的消息对象，即所有的CAN消息对象将会被处理！ */
}
else
{
      outpw((REG_CAN0_IF2_ARB1+uOffset), (u32id & 0xFFFF));
      outpw((REG_CAN0_IF2_ARB2+uOffset), (CAN_IF_ARB2_MSGVAL_Msk | CAN_IF_ARB2_XTD_Msk | (u32id & 0x1FFF0000)>>16));
}

outpw((REG_CAN0_IF2_MCON+uOffset), (inpw(REG_CAN0_IF2_MCON+uOffset) | CAN_IF_MCON_UMASK_Msk | CAN_IF_MCON_RXIE_Msk));

if(u8singleOrFifoLast)
{
      outpw((REG_CAN0_IF2_MCON+uOffset), (inpw(REG_CAN0_IF2_MCON+uOffset) | CAN_IF_MCON_EOB_Msk));
}
else
{
      outpw((REG_CAN0_IF2_MCON+uOffset), (inpw(REG_CAN0_IF2_MCON+uOffset) & ~CAN_IF_MCON_EOB_Msk));
}

outpw((REG_CAN0_IF2_DAT_A1+uOffset), 0x0);
outpw((REG_CAN0_IF2_DAT_A2+uOffset), 0x0);
outpw((REG_CAN0_IF2_DAT_B1+uOffset), 0x0);
outpw((REG_CAN0_IF2_DAT_B2+uOffset), 0x0);

outpw((REG_CAN0_IF2_CREQ+uOffset), (1 + u8MsgObj)); /* Message Object */

return TRUE;
}

只看该作者 · 2021-3-26 17:25

Reference: NUC970 Technical Reference Manual Page 822,  (CAN_IFn_MASK2), Msk[28:16] = 0 即可。
Msk[28:16] = 0 The corresponding bit in the identifier of the message object cannot inhibit the match in the acceptance filtering.

以下表述有误：
/*  参考　ＮＵＣ９７０　Technical Reference Manual Page 824.  CAN_IFn_ARB2, Bit 15, 0 = The Message Object is ignored by the Message Handler
         当把第１５位配置成０，将会忽略指定的消息对象，即所有的CAN消息对象将会被处理！ */

1万 · 2021-12-15 15:54

我认为例程和底层的驱动均是基于标识符列表模式，没有屏蔽位模式。因英语水平所限，不知怎样设置成屏蔽位模式，请各位指教，谢谢！

只看该作者 · 2021-12-15 15:55

Reference: NUC970 Technical Reference Manual Page 822,  (CAN_IFn_MASK2), Msk[28:16] = 0 即可。

以下表述有误：
/*  参考　ＮＵＣ９７０　Technical Reference Manual Page 824.  CAN_IFn_ARB2, Bit 15, 0 = The Message Object is ignored by the Message Handler
         当把第１５位配置成０，将会忽略指定的消息对象，即所有的CAN消息对象将会被处理！ */

NUC970 CAN接收任意ID的数据

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