Посылка по CAN в STM32F3 Опции

[Jenya7]

Настраиваю CAN

CODE

void CAN_Setup(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
CAN_InitTypeDef CAN_InitStructure;
CAN_FilterInitTypeDef CAN_FilterInitStructure;

/* CAN GPIOs configuration **************************************************/

/* Enable GPIO clock */
RCC->AHBENR |= RCC_AHBPeriph_GPIOB;

/* Connect CAN pins to AF9 */
GPIO_PinAFConfig(GPIOB, GPIO_PinSource8, GPIO_AF_9);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource9, GPIO_AF_9);

/* Configure CAN RX and TX pins */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8| GPIO_Pin_9;
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);

/* NVIC configuration *******************************************************/
NVIC_InitStructure.NVIC_IRQChannel = USB_LP_CAN1_RX0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

NVIC_InitStructure.NVIC_IRQChannel = CAN1_RX1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

/* CAN configuration ********************************************************/
/* Enable CAN clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN1, ENABLE);

/* CAN register init */
CAN_DeInit(CAN1);
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;
CAN_InitStructure.CAN_TXFP = DISABLE;
CAN_InitStructure.CAN_Mode = CAN_Mode_Normal;

/* 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_InitStructure.CAN_SJW = CAN_SJW_1tq;
//CAN_InitStructure.CAN_BS1 = CAN_BS1_3tq;
//CAN_InitStructure.CAN_BS2 = CAN_BS2_5tq;
//CAN_InitStructure.CAN_Prescaler = 39;
//CAN_InitStructure.CAN_SJW = 2;

CAN_Init(CANx, &CAN_InitStructure);

/* CAN filter init */
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 = 0;
CAN_FilterInitStructure.CAN_FilterActivation = ENABLE;
CAN_FilterInit(&CAN_FilterInitStructure);

/* Enable FIFO 0 message pending Interrupt */
CAN_ITConfig(CANx, CAN_IT_FMP0, ENABLE);
/* Enable FIFO 1 message pending Interrupt */
CAN_ITConfig(CANx, CAN_IT_FMP1, ENABLE);
}

Посылаю

Код

    TxMessage.StdId = ( (0x100 *(i+1)) + CAN_COM_WHO_IS);
    TxMessage.DLC = 1;
    TxMessage.RTR = CAN_RTR_DATA;
    TxMessage.IDE = CAN_ID_STD;
     CAN_Transmit(CAN1, &TxMessage);

В функции посылки - все мейлбоксы заняты - я попадаю в transmit_mailbox = CAN_TxStatus_NoMailBox;

CODE

uint8_t CAN_Transmit(CAN_TypeDef* CANx, CanTxMsg* TxMessage)
{
uint8_t transmit_mailbox = 0;
/* Check the parameters */
assert_param(IS_CAN_ALL_PERIPH(CANx));
assert_param(IS_CAN_IDTYPE(TxMessage->IDE));
assert_param(IS_CAN_RTR(TxMessage->RTR));
assert_param(IS_CAN_DLC(TxMessage->DLC));

/* Select one empty transmit mailbox */
if ((CANx->TSR&CAN_TSR_TME0) == CAN_TSR_TME0)
{
transmit_mailbox = 0;
}
else if ((CANx->TSR&CAN_TSR_TME1) == CAN_TSR_TME1)
{
transmit_mailbox = 1;
}
else if ((CANx->TSR&CAN_TSR_TME2) == CAN_TSR_TME2)
{
transmit_mailbox = 2;
}
else
{
transmit_mailbox = CAN_TxStatus_NoMailBox;
}

if (transmit_mailbox != CAN_TxStatus_NoMailBox)
{
/* Set up the Id */
CANx->sTxMailBox[transmit_mailbox].TIR &= TMIDxR_TXRQ;
if (TxMessage->IDE == CAN_Id_Standard)
{
assert_param(IS_CAN_STDID(TxMessage->StdId));
CANx->sTxMailBox[transmit_mailbox].TIR |= ((TxMessage->StdId << 21) | \
TxMessage->RTR);
}
else
{
assert_param(IS_CAN_EXTID(TxMessage->ExtId));
CANx->sTxMailBox[transmit_mailbox].TIR |= ((TxMessage->ExtId << 3) | \
TxMessage->IDE | \
TxMessage->RTR);
}

/* Set up the DLC */
TxMessage->DLC &= (uint8_t)0x0000000F;
CANx->sTxMailBox[transmit_mailbox].TDTR &= (uint32_t)0xFFFFFFF0;
CANx->sTxMailBox[transmit_mailbox].TDTR |= TxMessage->DLC;

/* Set up the data field */
CANx->sTxMailBox[transmit_mailbox].TDLR = (((uint32_t)TxMessage->Data[3] << 24) |
((uint32_t)TxMessage->Data[2] << 16) |
((uint32_t)TxMessage->Data[1] << 8) |
((uint32_t)TxMessage->Data[0]));
CANx->sTxMailBox[transmit_mailbox].TDHR = (((uint32_t)TxMessage->Data[7] << 24) |
((uint32_t)TxMessage->Data[6] << 16) |
((uint32_t)TxMessage->Data[5] << 8) |
((uint32_t)TxMessage->Data[4]));
/* Request transmission */
CANx->sTxMailBox[transmit_mailbox].TIR |= TMIDxR_TXRQ;
}
return transmit_mailbox;
}

Если принимающая сторона не приняла мейлбокс он не освободился ?

Сообщение отредактировал IgorKossak - Aug 19 2018, 20:06

Причина редактирования: [codebox] для длинного кода, [code] - для короткого!

[редактор]

я что то не нашел где там АСК отменить

Почитайте спецификацию на CAN?хотя бы в русском переводе.

[Jenya7]

Почитайте спецификацию на CAN?хотя бы в русском переводе.

я могу читать отсюда и до Урала, там регистров с гулькин нос. все биты просмотрел.

[adnega]

там регистров с гулькин нос. все биты просмотрел.

Может, это

Silent mode
The bxCAN can be put in Silent mode by setting the SILM bit in the CAN_BTR register.
In Silent mode, the bxCAN is able to receive valid data frames and valid remote frames, but
it sends only recessive bits on the CAN bus and it cannot start a transmission. If the bxCAN
has to send a dominant bit (ACK bit, overload flag, active error flag), the bit is rerouted
internally so that the CAN Core monitors this dominant bit, although the CAN bus may
remain in recessive state. Silent mode can be used to analyze the traffic on a CAN bus
without affecting it by the transmission of dominant bits (Acknowledge Bits, Error Frames).