CAN通讯的2个3级深度的FIFO使用

as2807479 · 发表于 2014-12-17 18:58:27

can  有2个3级深度的FIFO，    这2个是同时再用么？   第一个FIFO满了   自动存储到第2个 FIFO ？
例程上  只读了第一个  FIFO
  CAN_Receive(CAN1, CAN_FIFO0, &RxMessage);//读取数据

as2807479 · 发表于 2014-12-17 18:58:28

//过滤器 1
CAN_FilterInitStructure.CAN_FilterNumber         = 1;   //过滤器
CAN_FilterInitStructure.CAN_FilterMode           = CAN_FilterMode_IdMask; //标识符屏蔽位模式
   CAN_FilterInitStructure.CAN_FilterScale   = CAN_FilterScale_32bit; //过滤位宽为单个32位
    CAN_FilterInitStructure.CAN_FilterIdHigh = (((u32)0x1315<<3)&0xFFFF0000)>>16; //要过滤的ID高位
    CAN_FilterInitStructure.CAN_FilterIdLow = (((u32)0x1315<<3)|CAN_ID_EXT|CAN_RTR_DATA)&0xFFFF; //要过滤的ID低位
    CAN_FilterInitStructure.CAN_FilterMaskIdHigh = 0xFFFF; //过滤器高16位每位必须匹配
    CAN_FilterInitStructure.CAN_FilterMaskIdLow = 0xFFFF; //过滤器低16位每位必须匹配
   CAN_FilterInitStructure.CAN_FilterFIFOAssignment = CAN_Filter_FIFO0; //过滤器关联到FIFO0
CAN_FilterInitStructure.CAN_FilterActivation     = ENABLE; //激活过滤器

   CAN_FilterInit(&CAN_FilterInitStructure); //过滤器初始化

//过滤器 6
CAN_FilterInitStructure.CAN_FilterNumber         = 6 ;   //过滤器
CAN_FilterInitStructure.CAN_FilterMode           = CAN_FilterMode_IdMask; //标识符屏蔽位模式
   CAN_FilterInitStructure.CAN_FilterScale   = CAN_FilterScale_32bit; //过滤位宽为单个32位
    CAN_FilterInitStructure.CAN_FilterIdHigh = (((u32)0x1314<<3)&0xFFFF0000)>>16; //要过滤的ID高位
    CAN_FilterInitStructure.CAN_FilterIdLow = (((u32)0x1314<<3)|CAN_ID_EXT|CAN_RTR_DATA)&0xFFFF; //要过滤的ID低位
    CAN_FilterInitStructure.CAN_FilterMaskIdHigh = 0xFFFF; //过滤器高16位每位必须匹配
    CAN_FilterInitStructure.CAN_FilterMaskIdLow = 0xFFFF; //过滤器低16位每位必须匹配
   CAN_FilterInitStructure.CAN_FilterFIFOAssignment = CAN_Filter_FIFO1; //过滤器关联到FIFO1
CAN_FilterInitStructure.CAN_FilterActivation     = ENABLE; //激活过滤器

   CAN_FilterInit(&CAN_FilterInitStructure); //过滤器初始化


//使能中断
#if CAN_RX0_INT_ENABLE

CAN_ITConfig(CAN1,CAN_IT_FMP0 | CAN_IT_FF0 | CAN_IT_FOV0,ENABLE);
CAN_ITConfig(CAN1,CAN_IT_FMP1 | CAN_IT_FF1 | CAN_IT_FOV1,ENABLE); //FIFO0消息挂号中断允许.


   NVIC_InitStructure.NVIC_IRQChannel = USB_LP_CAN1_RX0_IRQn;
   NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;     // 主优先级为1
   NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;            // 次优先级为0
   NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
   NVIC_Init(&NVIC_InitStructure);

   NVIC_InitStructure.NVIC_IRQChannel = CAN1_RX1_IRQn;
   NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;     // 主优先级为1
   NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;            // 次优先级为0
   NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
   NVIC_Init(&NVIC_InitStructure);

终于搞定了，总结一下：
1、CAN数据接收报文首先通过过滤器，需要设置过滤器过滤条件，过滤器0条件为空的话，所有报文都通过过滤器0进入FIFO，其他的过滤器不起作用。（即过滤器的优先级选择，参看下面链接）
2、报文过滤了以后送给FIFO
3、过滤器给哪个FIFO是通过过滤器关联设置的
4、FIFO1接收中断是CAN1_RX1_IRQn ， FIFO0接收中断是USB_LP_CAN1_RX0_IRQn
CAN过滤器总结可以参看  http://wenku.baidu.com/link?url=wkdp0yynqFFrZ6itMFYIFzY3vTw4yETm1z0DJXV7GeHpUuqy7e1RN36hXU4fUQBENqEAgF3BvH46FnQu2CaEmFzlZJ4fTxpGFuRAsX4hFyW

as2807479 · 发表于 2014-12-17 19:34:23

测试了下用上位机软件发送 80个报文间隔10ms， FIFO0产生了满中断和溢出中断，但是FIFO1没有产生接收中断。
是否可以认为 CAN1没有用到 FIFO1 ,只用到了 FIFO0.

正点原子 · 发表于 2014-12-17 22:41:27

是可以同时用，但是你的过滤器得关联到对应的FIFO才行。
我们例程只关联到了FIFO0，所以FIFO1不可能出现数据。

as2807479 · 发表于 2014-12-18 18:43:15

回复【3楼】正点原子:
---------------------------------
FIFO1 中断服务函数是 void USB_LP_CAN1_RX0_IRQHandler(void)  还是 void CAN1_RX1_IRQHandler(void) ？

//过滤器
CAN_FilterInitStructure.CAN_FilterNumber         = 0;   //过滤器0
CAN_FilterInitStructure.CAN_FilterMode           = CAN_FilterMode_IdMask; //标识符屏蔽位模式
   CAN_FilterInitStructure.CAN_FilterScale   = CAN_FilterScale_32bit; //过滤位宽为单个32位
   CAN_FilterInitStructure.CAN_FilterIdHigh         = 0x0000;//32位ID
   CAN_FilterInitStructure.CAN_FilterIdLow          = 0x0000;
   CAN_FilterInitStructure.CAN_FilterMaskIdHigh     = 0x0000;//32位MASK
   CAN_FilterInitStructure.CAN_FilterMaskIdLow      = 0x0000;
   CAN_FilterInitStructure.CAN_FilterFIFOAssignment = CAN_Filter_FIFO0; //过滤器0关联到FIFO0
CAN_FilterInitStructure.CAN_FilterActivation     = ENABLE; //激活过滤器0

   CAN_FilterInit(&CAN_FilterInitStructure); //过滤器初始化

//过滤器

CAN_FilterInitStructure.CAN_FilterNumber         = 1 ;   //过滤器1
CAN_FilterInitStructure.CAN_FilterMode           = CAN_FilterMode_IdMask; //标识符屏蔽位模式
   CAN_FilterInitStructure.CAN_FilterScale   = CAN_FilterScale_32bit; //过滤位宽为单个32位
   CAN_FilterInitStructure.CAN_FilterIdHigh         = 0x0000;//32位ID
   CAN_FilterInitStructure.CAN_FilterIdLow          = 0x0000;
   CAN_FilterInitStructure.CAN_FilterMaskIdHigh     = 0x0000;//32位MASK
   CAN_FilterInitStructure.CAN_FilterMaskIdLow      = 0x0000;
   CAN_FilterInitStructure.CAN_FilterFIFOAssignment = CAN_Filter_FIFO1; //过滤器1关联到FIFO1
CAN_FilterInitStructure.CAN_FilterActivation     = ENABLE; //激活过滤器1

   CAN_FilterInit(&CAN_FilterInitStructure); //过滤器初始化

过滤器1关联到FIFO1 后  中断服务函数中的    CAN_IT_FMP1  、 CAN_IT_FOV1 、CAN_IT_FF1 这三个中断  都进不去。
CAN_ITConfig(CAN1,CAN_IT_FMP0 | CAN_IT_FF0 | CAN_IT_FOV0,ENABLE);
CAN_ITConfig(CAN1,CAN_IT_FMP1 | CAN_IT_FF1 | CAN_IT_FOV1,ENABLE); //FIFO0消息挂号中断允许.