firmware version 3 having CAN problem

[ian]

Posted on July 16, 2009 at 11:09

firmware version 3 having CAN problem

[ian]

Posted on May 17, 2011 at 13:17

I am using version 3.0.0 of the st firmware lib for the stm32 with a stm32f103rb and am have a issue with the set up.

When I use the CAN setup as shown in the example named 'Normal' setup shown: //CAN register init CAN_DeInit(CAN1); CAN_StructInit(&CAN_InitStructure); // Setup CAN and speed 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_9tq; CAN_InitStructure.CAN_BS2 = CAN_BS2_8tq; CAN_InitStructure.CAN_Prescaler = 4; CAN_Init(CAN1, &CAN_InitStructure); // CAN filter init CAN_FilterInitStructure.CAN_FilterNumber = 1; 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_FIFO0; CAN_FilterInitStructure.CAN_FilterActivation = ENABLE; CAN_FilterInit(&CAN_FilterInitStructure); No messages are transmit on the CAN bus, however when I change the mode to loopback as shown the CAN bus works fine. //CAN register init CAN_DeInit(CAN1); CAN_StructInit(&CAN_InitStructure); // Setup CAN and speed 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_LoopBack; CAN_InitStructure.CAN_SJW = CAN_SJW_1tq; CAN_InitStructure.CAN_BS1 = CAN_BS1_9tq; CAN_InitStructure.CAN_BS2 = CAN_BS2_8tq; CAN_InitStructure.CAN_Prescaler = 4; CAN_Init(CAN1, &CAN_InitStructure); // CAN filter init CAN_FilterInitStructure.CAN_FilterNumber = 1; 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_FIFO0; CAN_FilterInitStructure.CAN_FilterActivation = ENABLE; CAN_FilterInit(&CAN_FilterInitStructure); Any ideas?

[smart]

Posted on May 17, 2011 at 13:17

I am also using FW STD preipheral ver 3.0.

CAN is working fine. Just check your correct baud rate because in loopback mode Baud rate does not make any difference. Also check your CAN clock, AFIO clock and remapping pin if you are using STM32 evaluation board.

[ian]

Posted on May 17, 2011 at 13:17

I have found the problem I was not a problem with the software. After trying another board with the same software(it worked) I found that the issue caused by a dry joint on the Pin 4 of the CAN transciever chip.

:D