230的rs端接100k电阻到地
发送端：
/* CAN1 init function */
static void MX_CAN1_Init(void)
{
CAN_FilterConfTypeDef sFilterConfig;
static CanTxMsgTypeDef TxMessage;
static CanRxMsgTypeDef RxMessage;
hcan1.Instance = CAN1;
hcan1.pTxMsg = &TxMessage;
hcan1.pRxMsg = &RxMessage;
hcan1.Init.Prescaler = 8;
hcan1.Init.Mode = CAN_MODE_NORMAL;
hcan1.Init.SJW = CAN_SJW_1TQ;
hcan1.Init.BS1 = CAN_BS1_6TQ;
hcan1.Init.BS2 = CAN_BS2_3TQ;
hcan1.Init.TTCM = DISABLE;
hcan1.Init.ABOM = DISABLE;
hcan1.Init.AWUM = DISABLE;
hcan1.Init.NART = DISABLE;
hcan1.Init.RFLM = DISABLE;
hcan1.Init.TXFP = DISABLE;
if (HAL_CAN_Init(&hcan1) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}
/*##-2- Configure the CAN Filter ###########################################*/
sFilterConfig.FilterNumber = 0;
sFilterConfig.FilterMode = CAN_FILTERMODE_IDMASK;
sFilterConfig.FilterScale = CAN_FILTERSCALE_32BIT;
sFilterConfig.FilterIdHigh = 0x0000;
sFilterConfig.FilterIdLow = 0x0000;
sFilterConfig.FilterMaskIdHigh = 0x0000;
sFilterConfig.FilterMaskIdLow = 0x0000;
sFilterConfig.FilterFIFOAssignment = 0;
sFilterConfig.FilterActivation = ENABLE;
sFilterConfig.BankNumber = 14;
if (HAL_CAN_ConfigFilter(&hcan1, &sFilterConfig) != HAL_OK)
{
/* Filter configuration Error */
Error_Handler();
}
/*##-3- Configure Transmission process #####################################*/
hcan1.pTxMsg->StdId = 0x321;
hcan1.pTxMsg->ExtId = 0x01;
hcan1.pTxMsg->RTR = CAN_RTR_DATA;
hcan1.pTxMsg->IDE = CAN_ID_STD;
hcan1.pTxMsg->DLC = 8;
}
在主函数的whil（1）里
for(uint8_t ii = 0; ii < 8; ii++)
{
hcan1.pTxMsg->Data[ii] = 0xAA;
}
HAL_CAN_Transmit(&hcan1,10);
接收端
static void MX_CAN1_Init(void)
{
CAN_FilterConfTypeDef sFilterConfig;
static CanTxMsgTypeDef TxMessage;
static CanRxMsgTypeDef RxMessage;
hcan1.Instance = CAN1;
hcan1.pTxMsg = &TxMessage;
hcan1.pRxMsg = &RxMessage;
hcan1.Init.Prescaler = 8;
hcan1.Init.Mode = CAN_MODE_NORMAL;
hcan1.Init.SJW = CAN_SJW_1TQ;
hcan1.Init.BS1 = CAN_BS1_6TQ;
hcan1.Init.BS2 = CAN_BS2_3TQ;
hcan1.Init.TTCM = DISABLE;
hcan1.Init.ABOM = DISABLE;
hcan1.Init.AWUM = DISABLE;
hcan1.Init.NART = DISABLE;
hcan1.Init.RFLM = DISABLE;
hcan1.Init.TXFP = DISABLE;
if (HAL_CAN_Init(&hcan1) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}
/*##-2- Configure the CAN Filter ###########################################*/
sFilterConfig.FilterNumber = 0;
sFilterConfig.FilterMode = CAN_FILTERMODE_IDMASK;
sFilterConfig.FilterScale = CAN_FILTERSCALE_32BIT;
sFilterConfig.FilterIdHigh = 0x0000;
sFilterConfig.FilterIdLow = 0x0000;
sFilterConfig.FilterMaskIdHigh = 0x0000;
sFilterConfig.FilterMaskIdLow = 0x0000;
sFilterConfig.FilterFIFOAssignment = 0;
sFilterConfig.FilterActivation = ENABLE;
sFilterConfig.BankNumber = 14;
if (HAL_CAN_ConfigFilter(&hcan1, &sFilterConfig) != HAL_OK)
{
/* Filter configuration Error */
Error_Handler();
}
/*##-3- Configure Transmission process #####################################*/
hcan1.pTxMsg->StdId = 0x321;
hcan1.pTxMsg->ExtId = 0x01;
hcan1.pTxMsg->RTR = CAN_RTR_DATA;
hcan1.pTxMsg->IDE = CAN_ID_STD;
hcan1.pTxMsg->DLC = 8;
}
主函数里
__HAL_CAN_ENABLE_IT(&hcan1,CAN_IT_FF0);
HAL_NVIC_EnableIRQ(CAN1_RX0_IRQn);
if (HAL_CAN_Receive_IT(&hcan1, CAN_FIFO0) != HAL_OK)
{
/* Reception Error */
Error_Handler();
}
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