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标题: NUC970 CAN接收任意ID的数据 [打印本页]

作者: 匿名 时间: 2021-3-25 14:48
标题: NUC970 CAN接收任意ID的数据
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！

作者: admin 时间: 2021-3-25 16:48
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;
}

作者: 匿名 时间: 2021-3-26 13:58
首先，感谢“admin”给的解答。
我参照例程编写的程序能够接收固定的标识符数据包。我实测发现，将CAN_IFn_ARB2寄存器的Bit15设置成“0”
则接收不到数据包。
程序如下：
int32_t CAN_SetRxMsgObj(UINT32  uCAN, uint8_t u8MsgObj, uint8_t u8idType, uint32_t u32id, uint8_t u8singleOrFifoLast)
{
UINT32 uOffset = uCAN * CAN_OFFSET;
UINT32 reg;

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));
} 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));
}
/*********************添加使Bit15 =0*************************/
reg = inpw(REG_CAN0_IF2_ARB2+uOffset);
reg = reg & (UINT32)(~(0x01<<15));
outpw((REG_CAN0_IF2_ARB2+uOffset),reg);
/************************************************/
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));

return TRUE;
}

/****************************************************************
;函数名称: void InitControlCan0(void)
;函数功能：初始化CAN0
;输入参数：无
;返回参数：无
;版本：1.0
;编制日期：
;编写：
****************************************************************/
void InitControlCan0(void)
{
outpw(REG_SYS_GPH_MFPL, (inpw(REG_SYS_GPH_MFPL) & 0xffff00ff) | 0xCC00 ); // GPH_2,GPH_3 // RX, TX
outpw(REG_CLK_PCLKEN1, (inpw(REG_CLK_PCLKEN1) | (1 << 8) ));                //开CAN0时钟
CAN_Open(CAN0,  125000, CAN_NORMAL_MODE);

CAN_SetRxMsg(CAN0, MSG(0),CAN_EXT_ID,(CAN_ID_RX_1));//0);//(unsigned int)(0x05<<26))
//CAN_SetRxMsg(CAN0, MSG(1),CAN_EXT_ID,(unsigned int)((0x05<<26)|0x16));
//CAN_SetRxMsg(CAN0, MSG(2),CAN_EXT_ID,(unsigned int)(0x05));

CAN_EnableInt(CAN0, CAN_CON_IE_Msk);
sysInstallISR((IRQ_LEVEL_6 | HIGH_LEVEL_SENSITIVE), CAN0_IRQn, (PVOID)CAN0_IRQHandler);
sysSetLocalInterrupt(ENABLE_IRQ);    /* enable CPSR I bit */
sysEnableInterrupt(CAN0_IRQn);

sysprintf("Wait Msg\n");

}

作者: 匿名 时间: 2021-3-26 14:05
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！

作者: arthur 时间: 2021-3-26 17:22
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！ */

作者: 匿名 时间: 2021-3-27 15:46
我将底层的驱动做如下改动，想配置成屏蔽模式，但是依然接收不到数据，不知问题出在何处？
int32_t CAN_SetRxMsgObj(UINT32  uCAN, uint8_t u8MsgObj, uint8_t u8idType, uint32_t u32id, uint8_t u8singleOrFifoLast)
{
UINT32 uOffset = uCAN * CAN_OFFSET;
UINT32 reg;

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));
// } 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));
// }

/************************改写成掩码模式****************/
outpw((REG_CAN0_IF2_CMASK+uOffset), (CAN_IF_CMASK_WRRD_Msk | CAN_IF_CMASK_MASK_Msk |CAN_IF_CMASK_TXRQSTNEWDAT_Msk|
                                       CAN_IF_CMASK_CONTROL_Msk | CAN_IF_CMASK_DATAA_Msk | CAN_IF_CMASK_DATAB_Msk));

outpw((REG_CAN0_IF1_MASK1+uOffset),0);
//outpw((REG_CAN0_IF1_MASK2+uOffset),0x03<<15);
outpw((REG_CAN0_IF1_MASK2+uOffset),0);

outpw((REG_CNA0_IF2_MASK1+uOffset),0);
//outpw((REG_CAN0_IF2_MASK2+uOffset),0x03<<14);
outpw((REG_CAN0_IF2_MASK2+uOffset),0);

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

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));

return TRUE;
}

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