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单片机为STM32F103，CAN通讯波特率设置为250Kbps，使用库函数做的。
正常小数据通讯的时候没有问题，但是大量帧数据连续下发的时候，CAN有时候就收不到数据，这是怎么回事呢？哪位大婶帮帮忙。
以下是初始化程序
void CAN_Config(void)//初始化配置
{
GPIO_InitTypeDef GPIO_InitStructure;
CAN_InitTypeDef CAN_InitStructure;
CAN_FilterInitTypeDef CAN_FilterInitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO | RCC_APB2Periph_GPIOD,ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN1 ,ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOD,&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOD,&GPIO_InitStructure);
GPIO_PinRemapConfig(GPIO_Remap2_CAN1,ENABLE);
CAN_DeInit(CAN1);
CAN_StructInit(&CAN_InitStructure);
CAN_InitStructure.CAN_TTCM = DISABLE;
CAN_InitStructure.CAN_ABOM = DISABLE;
CAN_InitStructure.CAN_AWUM = DISABLE;
CAN_InitStructure.CAN_NART = DISABLE;
CAN_InitStructure.CAN_RFLM = DISABLE;
CAN_InitStructure.CAN_TXFP = DISABLE;
CAN_InitStructure.CAN_Mode = CAN_Mode_Normal;
CAN_InitStructure.CAN_SJW = CAN_SJW_1tq;
CAN_InitStructure.CAN_BS1 = CAN_BS1_8tq;
CAN_InitStructure.CAN_BS2 = CAN_BS2_7tq;
CAN_InitStructure.CAN_Prescaler = 9;
CAN_Init(CAN1,&CAN_InitStructure);
CAN_FilterInitStructure.CAN_FilterNumber = 0;
CAN_FilterInitStructure.CAN_FilterMode = CAN_FilterMode_IdMask;
CAN_FilterInitStructure.CAN_FilterScale = CAN_FilterScale_32bit;
CAN_FilterInitStructure.CAN_FilterIdHigh = 0x0000;
CAN_FilterInitStructure.CAN_FilterIdLow = 0x0000;
CAN_FilterInitStructure.CAN_FilterMaskIdHigh = 0x0000;
CAN_FilterInitStructure.CAN_FilterMaskIdLow = 0x0000;
CAN_FilterInitStructure.CAN_FilterFIFOAssignment = CAN_Filter_FIFO0;
CAN_FilterInitStructure.CAN_FilterActivation = ENABLE;
CAN_FilterInit(&CAN_FilterInitStructure);
CAN_ITConfig(CAN1,CAN_IT_FMP0,ENABLE);
}
以下是CAN中断程序：
void CAN1_RX0_IRQHandler(void)
{
u8 i;
CAN_Receive(CAN1,CAN_FIFO0,&CAN_Rr_Message);
ID_Source = (CAN_Rr_Message.ExtId)>>21;
ID_aim = (CAN_Rr_Message.ExtId)>>13;
ID_cnt = (CAN_Rr_Message.ExtId)>>5;
if((ID_Source == 0x01 || ID_Source == 0x00) && ID_aim == 0xff)
{
for(i=0;i<CAN_Rr_Message.DLC;i++)
{
USART1Buffer[i+8*ID_cnt]=CAN_Rr_Message.Data[i];
}
if(USART1Count > 2000)USART1Count = 0;
if((8*ID_cnt+CAN_Rr_Message.DLC)>USART1Count)USART1Count=8*ID_cnt + CAN_Rr_Message.DLC;
if((CAN_Rr_Message.ExtId & 0x10)==0)
{
CAN_Data_Handler();//此处为协议处理
}
}
} |
阿莫论坛20周年了！感谢大家的支持与爱护！！
一只鸟敢站在脆弱的枝条上歇脚，它依仗的不是枝条不会断，而是自己有翅膀，会飞。
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发表于 2015-10-19 08:28:35
楼主
我很想知道结果和过程。
