CAN_Transmit(CAN1, &TxMessage);返回CAN_TxStatus_NoMailBox

漆黑丨夜 · 发表于 2018-1-2 17:21:52

单片机芯片：STM32F103ZET6
CAN收发芯片：ISO1050隔离式收发芯片

程序定时通过CAN发送数据。在上电运行后，能正常收发通讯，并用示波器检测到信号波形。运行过程中，断开CAN收发芯片电源然后又重新接上。发现程序不能发送数据，经调试发现CAN_Transmit(CAN1, &TxMessage);发送数据后返回0x04 = (CAN_TxStatus_NoMailBox)。请问各位大神是什么导致该现象产生？另外，程序需要做什么处理才能继续收发数据？

CAN初始化：CAN1_Init(CAN_SJW_1tq, CAN_BS2_8tq, CAN_BS1_9tq, 4, CAN_Mode_Normal);//CAN初始化为正常模式，波特率为：500Kbps

[mw_shl_code=c,true]
void CAN1_Init(u8 tsjw, u8 tbs2, u8 tbs1, u16 brp, u8 mode)
{
GPIO_InitTypeDef GPIO_InitStructure;
CAN_InitTypeDef CAN_InitStructure;
CAN_FilterInitTypeDef CAN_FilterInitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

//使能GPIOA、CAN1的时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN1, ENABLE);

//CAN1_RX GPIOA.11
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;//PA11
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;//上拉输入
GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.11

//CAN1_TX GPIOA.12
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;//PA12
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;//复用推挽输出
GPIO_Init(GPIOA, &GPIO_InitStructure);//初始化GPIOA.12

//CAN参数配置
CAN_InitStructure.CAN_TTCM = DISABLE; //非时间触发通信模式
CAN_InitStructure.CAN_ABOM = DISABLE; //软件自动离线管理
CAN_InitStructure.CAN_AWUM = DISABLE; //睡眠模式通过软件唤醒(清除CAN->MCR的SLEEP位)
CAN_InitStructure.CAN_NART = ENABLE; //禁止报文自动传送
CAN_InitStructure.CAN_RFLM = DISABLE; //报文不锁定，新的覆盖旧的
CAN_InitStructure.CAN_TXFP = DISABLE; //优先级由报文标识符决定
CAN_InitStructure.CAN_Mode = mode; //模式设置：mode：0,普通模式;1,回环模式;
//设置波特率
CAN_InitStructure.CAN_SJW = tsjw; //重新同步跳跃宽度(Tsjw)为tsjw+1个时间单位 CAN_SJW_1tq ~ CAN_SJW_4tq
CAN_InitStructure.CAN_BS1 = tbs1; //Tbs1 = tbs1+1个时间单位 CAN_BS1_1tq ~ CAN_BS1_16tq
CAN_InitStructure.CAN_BS2 = tbs2; //Tbs2 = tbs2+1个时间单位 CAN_BS2_1tq ~ CAN_BS2_8tq
CAN_InitStructure.CAN_Prescaler = brp;//分频系数(Fdiv)为brp+1
CAN_Init(CAN1, &CAN_InitStructure); //初始化CAN1

//过滤器参数配置
CAN_FilterInitStructure.CAN_FilterNumber = 0; //使用过滤器0
CAN_FilterInitStructure.CAN_FilterMode = CAN_FilterMode_IdMask;//屏蔽位模式
CAN_FilterInitStructure.CAN_FilterScale = CAN_FilterScale_32bit;//32位宽
CAN_FilterInitStructure.CAN_FilterIdHigh = 0x0000; //32位ID_高16位
CAN_FilterInitStructure.CAN_FilterIdLow = 0x0000; //32位ID_低16位
CAN_FilterInitStructure.CAN_FilterMaskIdHigh = 0x0000;//32位MASK_高16位
CAN_FilterInitStructure.CAN_FilterMaskIdLow = 0x0000;//32位MASK_低16位
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);//初始化过滤器组

//接收中断参数配置
CAN_ITConfig(CAN1, CAN_IT_FMP0, ENABLE);//FIFO0消息挂号中断允许
NVIC_InitStructure.NVIC_IRQChannel = USB_LP_CAN1_RX0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;//抢占优先级1
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;//子优先级0
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;//接收IRQ通道使能
NVIC_Init(&NVIC_InitStructure);//初始化接收中断配置
}
[/mw_shl_code]

[mw_shl_code=c,true]
u8 Can_Send_Message(u8 stdID, u8 extID, u8 * msg, u8 len)
{
u8 retMsgBox;//返回邮箱号
u16 i = 0;
CanTxMsg TxMessage;

//填充数据包
TxMessage.StdId = stdID; //标准标识符，低11位有效
TxMessage.ExtId = extID; //拓展标识符，低29位有效
TxMessage.IDE = CAN_ID_STD;//标准帧
TxMessage.RTR = CAN_RTR_DATA;//数据帧
TxMessage.DLC = len;//发送数据长度
for(i = 0; i < len; i++)
{
TxMessage.Data = msg;
}
//发送数据包
retMsgBox = CAN_Transmit(CAN1, &TxMessage);
i = 0;
while((CAN_TransmitStatus(CAN1, retMsgBox) == CAN_TxStatus_Failed)&&(i < 0xFFF))//等待发送结束
{
i++;
}
if(i >= 0xFFF)
{
return 1;//超时失败返回
}
return 0;//成功返回
}
[/mw_shl_code]