完成第一版can comm多机通信,还未测验,可能有bug.
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@ -11,7 +11,10 @@
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"user_lib.h": "c",
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"chassis.h": "c",
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"can_comm.h": "c",
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"string.h": "c"
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"string.h": "c",
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"stdlib.h": "c",
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"crc8.h": "c",
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"main.h": "c"
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},
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"C_Cpp.default.configurationProvider": "ms-vscode.makefile-tools",
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"C_Cpp.intelliSenseEngineFallback": "enabled",
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@ -1,16 +1,62 @@
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#include "can_comm.h"
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#include "memory.h"
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#include "stdlib.h"
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#include "crc8.h"
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/* can_comm用于保存每个实例的指针数组,用于回调函数区分实例 */
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static CANCommInstance *can_comm_instance[MX_CAN_COMM_COUNT] = {NULL};
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static uint8_t idx;
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static uint8_t idx; //配合can_comm_instance的初始化使用,标识当前初始化的是哪一个实例
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/**
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* @brief
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*
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* @param _instance
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*/
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static void CANCommRxCallback(can_instance *_instance)
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{
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for (size_t i = 0; i < idx; i++)
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{
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if (&can_comm_instance[i]->can_ins == _instance)
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if (&can_comm_instance[i]->can_ins == _instance) // 遍历,找到对应的接收CAN COMM实例
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{
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if(_instance->rx_buff[0]==CAN_COMM_HEADER && can_comm_instance[i]->recv_state==0) //尚未开始接收且新的一包里有帧头
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{
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if(_instance->rx_buff[1]==can_comm_instance[i]->recv_data_len) // 接收长度等于设定接收长度
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{
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can_comm_instance[i]->recv_state=1;
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}
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else
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return ; //直接跳过即可
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}
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if(can_comm_instance[i]->recv_state) //已经开始接收
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{ // 直接拷贝到当前的接收buffer后面
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memcpy(can_comm_instance[i]->raw_recvbuf+can_comm_instance[i]->cur_recv_len,_instance->rx_buff,8);
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can_comm_instance[i]->cur_recv_len+=8;
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// 当前已经收满
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if(can_comm_instance[i]->cur_recv_len>=can_comm_instance[i]->recv_buf_len)
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{ // buff里本该是tail的位置不等于CAN_COMM_TAIL
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if(can_comm_instance[i]->raw_recvbuf[can_comm_instance[i]->recv_buf_len-1]!=CAN_COMM_TAIL)
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{
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memset(can_comm_instance[i]->raw_recvbuf,0,can_comm_instance[i]->recv_buf_len);
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can_comm_instance[i]->recv_state=0;
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can_comm_instance[i]->cur_recv_len=0;
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return ; // 重置状态然后返回
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}
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else // tail正确, 对数据进行crc8校验
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{
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if(can_comm_instance[i]->raw_recvbuf[can_comm_instance[i]->recv_buf_len-2] ==
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crc_8(can_comm_instance[i]->raw_recvbuf+2,can_comm_instance[i]->recv_data_len))
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{ // 通过校验,复制数据到unpack_data中
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memcpy(can_comm_instance[i]->raw_recvbuf+2,can_comm_instance[i]->unpacked_recv_data,can_comm_instance[i]->recv_data_len);
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can_comm_instance[i]->update_flag=1; //数据更新flag置为1
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}
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memset(can_comm_instance[i]->raw_recvbuf,0,can_comm_instance[i]->recv_buf_len); //整个buff置零
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can_comm_instance[i]->recv_state=0;
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can_comm_instance[i]->cur_recv_len=0;
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return ; // 重置状态然后返回
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}
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}
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}
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return ;
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}
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}
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}
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@ -13,7 +13,6 @@
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#include "bsp_can.h"
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#include "crc8.h"
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#define MX_CAN_COMM_COUNT 4 //注意均衡负载,一条总线上不要挂载过多的外设
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@ -1,3 +1,36 @@
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can_comm
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# can_comm
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<p align='right'>neozng1@hnu.edu.cn</p>
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双板CAN通信模块
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## 总览和封装说明
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## 代码结构
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## 外部接口
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## 私有函数和变量
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## 接收解析流程
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双板CAN通信
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