stm32f042 + can bus

[Jaroslav Buchta]

Zkuste CAN_ABOM a CAN_NART nastavit na ENABLE.
Neni sbernice defaultne v neklidovem stavu, treba prehozene H a L nebo 
zkrat? Radic to detekuje a po nejakych stech cyklech se uvede do 
neprovozniho stavu (ABOM resi aspon automatickou reinicializaci po 
nejakem case klidu na sbernici)

Dne 10.11.2016 v 13:38 tomas mainzer napsal(a):
> Dobry den,
> nemate nekdo prosim funkcni priklad pro STM32F042 a can bus?
> Vychazim z prikladu pro STM32f072  - ake nedari se mi ani odeslat CAN 
> packet - uz jsem vyzkousel priklady (puvodne pro STM32F072) pro SPL 
> knihovny (to prekladam v embitz) i pro CubeMX (to prekladam v Atollic 
> TRUEstudiu) a nedokazu prijit na to kde je zakopan pes.
> Uvitam jakekoliv tipy.
>
> Nize je relevantni vysek programu pro SPL (CAN je na pinech PA11,PA12):
>
>
>  GPIO_InitTypeDef  GPIO_InitStructure;
>   NVIC_InitTypeDef  NVIC_InitStructure;
>   CAN_InitTypeDef   CAN_InitStructure;
>   CAN_FilterInitTypeDef  CAN_FilterInitStructure;
>
>
>   /* CAN GPIOs configuration 
> **************************************************/
>
>   /* Enable GPIO clock */
>   //RCC_AHBPeriphClockCmd(CAN_GPIO_CLK, ENABLE);
>   RCC_AHBPeriphClockCmd(RCC_APB1Periph_CAN, ENABLE);
>   RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
>
>   /* Connect CAN pins to AF7 */
>   GPIO_PinAFConfig(CAN_GPIO_PORT, CAN_RX_SOURCE, CAN_AF_PORT);
>   GPIO_PinAFConfig(CAN_GPIO_PORT, CAN_TX_SOURCE, CAN_AF_PORT);
>
>   /* Configure CAN RX and TX pins */
>   GPIO_InitStructure.GPIO_Pin = CAN_RX_PIN | CAN_TX_PIN;
>   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
>   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
>   GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
>   GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_UP;
>   GPIO_Init(CAN_GPIO_PORT, &GPIO_InitStructure);
>
>   /* CAN NVIC  configuration 
> **************************************************/
>   NVIC_InitStructure.NVIC_IRQChannel = CEC_CAN_IRQn;
>   NVIC_InitStructure.NVIC_IRQChannelPriority = 0;
>   NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
>   NVIC_Init(&NVIC_InitStructure);
>
>   /* CAN configuration 
> ********************************************************/
>   /* Enable CAN clock */
>   RCC_APB1PeriphClockCmd(CAN_CLK, ENABLE);
>
>   /* CAN register init */
>   CAN_DeInit(CANx);
>   CAN_StructInit(&CAN_InitStructure);
>
>   /* CAN cell init */
>   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;//ENABLE;
>   CAN_InitStructure.CAN_TXFP = DISABLE;//ENABLE;
>   CAN_InitStructure.CAN_Mode = CAN_Mode_Normal;
>   CAN_InitStructure.CAN_SJW = CAN_SJW_1tq;
>
>   /* CAN Baudrate = 1MBps (CAN clocked at 36 MHz) */
>   CAN_InitStructure.CAN_BS1 = CAN_BS1_9tq;
>   CAN_InitStructure.CAN_BS2 = CAN_BS2_8tq;
>   CAN_InitStructure.CAN_Prescaler = 2;
>   CAN_Init(CANx, &CAN_InitStructure);
>
>   /* CAN filter init "FIFO0" */
>   CAN_FilterInitStructure.CAN_FilterNumber = 0;
>   CAN_FilterInitStructure.CAN_FilterMode = CAN_FilterMode_IdList;
>   CAN_FilterInitStructure.CAN_FilterScale = CAN_FilterScale_32bit;
>   CAN_FilterInitStructure.CAN_FilterIdHigh = 0x6420;
>   CAN_FilterInitStructure.CAN_FilterIdLow = 0x2461;
>   CAN_FilterInitStructure.CAN_FilterMaskIdHigh = 0x0000;
>   CAN_FilterInitStructure.CAN_FilterMaskIdLow = 0x0000;
>   CAN_FilterInitStructure.CAN_FilterFIFOAssignment = 0;
>   CAN_FilterInitStructure.CAN_FilterActivation = ENABLE;
>   CAN_FilterInit(&CAN_FilterInitStructure);
>
>   /* Transmit Structure preparation */
>   TxMessage.StdId = 0x321;
>   TxMessage.ExtId = 0x00;
>   TxMessage.RTR = CAN_RTR_DATA;
>   TxMessage.IDE = CAN_ID_STD;
>   TxMessage.DLC = 1;
>
>   /* Enable FIFO 0 full Interrupt */
>   //CAN_ITConfig(CANx, CAN_IT_FF0, ENABLE);
>   CAN_ITConfig(CANx, CAN_IT_FMP0, ENABLE);
>
> ...
>
> TxMessage.Data[0] = (uint8_t)(tick);
> CAN_Transmit(CANx, &TxMessage);
>
>
> Dekuji. TM.
>
>
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