Question
STM32F103 CAN CYCLE TIME
Hi,
I am STM32F103 with 72Mhz clock and am trying to send the CAN messages (MCP2561 as CAN transceiver) with 500kbps and am using CAN BUS ANALYZER to check the CAN msgs.
Here am sending 3 CAN msgs for every 100ms using timer interrupt but some times some msgs are missing so that am getting the CAN cycle time as 200ms.
Here am attaching some code.
what I have to do eliminate this error ?
Thanks
void MX_CAN_Init(void)
{
hcan.Instance = CAN1;
hcan.Init.Prescaler = 9;
hcan.Init.Mode = CAN_MODE_NORMAL;
hcan.Init.SyncJumpWidth = CAN_SJW_1TQ;
hcan.Init.TimeSeg1 = CAN_BS1_3TQ;
hcan.Init.TimeSeg2 = CAN_BS2_4TQ;
hcan.Init.TimeTriggeredMode = DISABLE;
hcan.Init.AutoBusOff = DISABLE;
hcan.Init.AutoWakeUp = DISABLE;
hcan.Init.AutoRetransmission = DISABLE;
hcan.Init.ReceiveFifoLocked = DISABLE;
hcan.Init.TransmitFifoPriority = DISABLE;
if (HAL_CAN_Init(&hcan) != HAL_OK)
{
Error_Handler();
}
}
void Send_msg1(void)
{
txHeader.IDE = CAN_ID_EXT;
txHeader.ExtId = 0x14244050;
txHeader.RTR = CAN_RTR_DATA;
txHeader.DLC = 8;
txHeader.TransmitGlobalTime = DISABLE;
if (HAL_CAN_AddTxMessage(&hcan, &txHeader,msg1,&canTxMailbox1) != HAL_OK)
{
Error_Handler();
}
}
void Send_msg2(void)
{
txHeader.IDE = CAN_ID_EXT;
txHeader.ExtId = 0x10281050;
txHeader.RTR = CAN_RTR_DATA;
txHeader.DLC = 8;
txHeader.TransmitGlobalTime = DISABLE;
if (HAL_CAN_AddTxMessage(&hcan,&txHeader,msg2,&canTxMailbox2) != HAL_OK)
{
Error_Handler();
}
}
void Send_msg3(void)
{
txHeader.IDE = CAN_ID_EXT;
txHeader.ExtId = 0x14234050;
txHeader.RTR = CAN_RTR_DATA;
txHeader.DLC = 8;
txHeader.TransmitGlobalTime = DISABLE;
if (HAL_CAN_AddTxMessage(&hcan,&txHeader,msg3,&canTxMailbox3) != HAL_OK)
{
Error_Handler();
}
}