Posted on November 19, 2015 at 15:54
Hi, I use
an
STM32F407
,
I'm trying
communication
with CAN bus,
for now only
transmission
, using Hal library.
1) I have setted PA11 (CAN1_RX) and PA12 (CAN1_TX):
void HAL_CAN_MspInit(CAN_HandleTypeDef* hcan)
{
GPIO_InitTypeDef GPIO_InitStruct;
/* Enable peripherals and GPIO Clocks */
/* CAN1 Periph clock enable */
CANx_CLK_ENABLE();
/* Enable GPIO clock ****************************************/
CANx_GPIO_CLK_ENABLE();
/* Configure peripheral GPIO */
/* CAN1 TX GPIO pin configuration (PA12)*/
GPIO_InitStruct.Pin = CANx_TX_PIN;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Alternate = CANx_TX_AF;
HAL_GPIO_Init(CANx_TX_GPIO_PORT, &GPIO_InitStruct);
/* CAN1 RX GPIO pin configuration (PA11)*/
GPIO_InitStruct.Pin = CANx_RX_PIN;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Speed = GPIO_SPEED_FAST;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Alternate = CANx_RX_AF;
HAL_GPIO_Init(CANx_RX_GPIO_PORT, &GPIO_InitStruct);
/* Configure the NVIC */
/* NVIC configuration for CAN1 Reception complete interrupt */
HAL_NVIC_SetPriority(CANx_RX_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(CANx_RX_IRQn);
}
It's correct?
2) I have a
clock of
42MHz
(
APB1), I want a
sample
point
to 75
% and baudrate of 250 Kbit/s,
my settings
are
:
CanHandle.Init.TTCM = DISABLE;
CanHandle.Init.ABOM = DISABLE;
CanHandle.Init.AWUM = DISABLE;
CanHandle.Init.NART = DISABLE;
CanHandle.Init.RFLM = DISABLE;
CanHandle.Init.TXFP = DISABLE;
CanHandle.Init.Mode = CAN_MODE_NORMAL;
CanHandle.Init.SJW = CAN_SJW_1TQ;
CanHandle.Init.BS1 = CAN_BS1_8TQ;
CanHandle.Init.BS2 = CAN_BS2_3TQ;
CanHandle.Init.Prescaler = 11;
It's correct?
3) I have a problem with the function ''HAL_CAN_Transmit()'', when
i call it in the main.c
it returns timeout, waiting for TransmitMailbox to be sent (Following codes are from : stm32f4xx_hal_can.
/* Check End of transmission flag */
while(!(__HAL_CAN_TRANSMIT_STATUS(hcan, transmitmailbox)))
{
/* Check for the Timeout */
if(Timeout != HAL_MAX_DELAY)
{
if((Timeout == 0)||((HAL_GetTick() - tickstart ) > Timeout))
{
hcan->State = HAL_CAN_STATE_TIMEOUT;
/* Process unlocked */
__HAL_UNLOCK(hcan);
return HAL_TIMEOUT;
}
}
}
Why?
Also
the function
''HAL_CAN_Transmit()
''
does not send anything
.
Thank you in advance
#setup #stm32f4 #can #transmit
