Posted on February 22, 2016 at 16:58Hi Everyone,
I'm trying to make the CAN working on my board, I use a STM32F103, with the HAL example, (cube F1).
I did init as the example, I'm using the same pin PB8 & PB9. I calculate the baudrate to be at 250kBits
Like other I do see CAN trace on the output in loopback mode, nothing in Normal.
I do have a 120Ohm resistor,
I can see trace on PEAKCAN in loopback, not in Normal.
Can_Init(void)
{
CAN_FilterConfTypeDef sFilterConfig;
HAL_CAN_DeInit(&CanHandle);
/*♯♯-1- Configure the CAN peripheral ♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯*/
CanHandle.Instance = CANx;
CanHandle.pTxMsg = &TxMessage;
CanHandle.pRxMsg = &RxMessage;
CanHandle.Init.TTCM = DISABLE;
CanHandle.Init.ABOM = DISABLE;
CanHandle.Init.AWUM = DISABLE;
CanHandle.Init.NART = DISABLE;
CanHandle.Init.RFLM = DISABLE;
CanHandle.Init.TXFP = ENABLE;
CanHandle.Init.Mode = CAN_MODE_LOOPBACK;//CAN_MODE_LOOPBACK;//CAN_MODE_NORMAL;
CanHandle.Init.SJW = CAN_SJW_1TQ;
CanHandle.Init.BS1 = CAN_BS1_14TQ;
CanHandle.Init.BS2 = CAN_BS2_3TQ;
CanHandle.Init.Prescaler = 16;
/* 72 000 / 250 = 288 (250k)*/
/* 288 / 16 = 18 (16 as random)*/
/* 18-1 = 17 (-1 as datasheet)*/
/* 17 * 0.875 = 14 -> BS1 (0.875 needed for canOPEN)*/
/* 17-14 = 3 -> BS2*/
CANx_FORCE_RESET();
CANx_RELEASE_RESET();
if (HAL_CAN_Init(&CanHandle) != HAL_OK)
{
/* Initiliazation Error */
trace_Send(0, ''HAL_CAN_Init !'');
}
/*♯♯-2- Configure the CAN Filter ♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯*/
sFilterConfig.FilterNumber = 0;
sFilterConfig.FilterMode = CAN_FILTERMODE_IDMASK;
sFilterConfig.FilterScale = CAN_FILTERSCALE_32BIT;
sFilterConfig.FilterIdHigh = 0x0000;
sFilterConfig.FilterIdLow = 0x0000;
sFilterConfig.FilterMaskIdHigh = 0x0000;
sFilterConfig.FilterMaskIdLow = 0x0000;
sFilterConfig.FilterFIFOAssignment = 0;
sFilterConfig.FilterActivation = ENABLE;
sFilterConfig.BankNumber = 0;
if (HAL_CAN_ConfigFilter(&CanHandle, &sFilterConfig) != HAL_OK)
{
/* Filter configuration Error */
trace_Send(0, ''HAL_CAN_ConfigFilter !'');
}
/*♯♯-3- Configure Transmission process ♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯*/
CanHandle.pTxMsg->StdId = 0x321;
CanHandle.pTxMsg->ExtId = 0x01;
CanHandle.pTxMsg->RTR = CAN_RTR_DATA;
CanHandle.pTxMsg->IDE = CAN_ID_STD;
CanHandle.pTxMsg->DLC = 8;
CanHandle.pTxMsg->Data[0]= 0x30;
CanHandle.pTxMsg->Data[1]= 0x31;
CanHandle.pTxMsg->Data[2]= 0x32;
CanHandle.pTxMsg->Data[3]= 0x33;
CanHandle.pTxMsg->Data[4]= 0x34;
CanHandle.pTxMsg->Data[5]= 0x35;
CanHandle.pTxMsg->Data[6]= 0x36;
CanHandle.pTxMsg->Data[7]= 0x37;
}
void HAL_CAN_MspInit(CAN_HandleTypeDef *hcan)
{
GPIO_InitTypeDef GPIO_InitStruct;
/*♯♯-1- Enable peripherals and GPIO Clocks ♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯*/
CANx_GPIO_CLK_ENABLE();
CANx_CLK_ENABLE();
/* Enable AFIO clock and Remap CAN PINs to PB8 and PB9*******/
CANx_AFIO_REMAP_CLK_ENABLE();
CANx_AFIO_REMAP_RX_TX_PIN();
/*♯♯-2- Configure peripheral GPIO ♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯*/
/* CAN1 TX GPIO pin configuration */
GPIO_InitStruct.Pin = CANx_TX_PIN;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
GPIO_InitStruct.Pull = GPIO_PULLUP;//GPIO_PULLUP;GPIO_NOPULL
HAL_GPIO_Init(CANx_TX_GPIO_PORT, &GPIO_InitStruct);
/* CAN1 RX GPIO pin configuration */
GPIO_InitStruct.Pin = CANx_RX_PIN;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
GPIO_InitStruct.Pull = GPIO_PULLUP;//GPIO_PULLUP;GPIO_NOPULL
HAL_GPIO_Init(CANx_RX_GPIO_PORT, &GPIO_InitStruct);
/*♯♯-3- Configure the NVIC ♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯*/
/* NVIC configuration for CAN1 Reception complete interrupt */
HAL_NVIC_SetPriority(CANx_RX_IRQn, 1, 0);
HAL_NVIC_EnableIRQ(CANx_RX_IRQn);
}
void Can_Send(void)
{
if(HAL_CAN_Transmit(&CanHandle, 800)){
trace_Send(0, ''CAN Error'');
}
else{
trace_Send(0, ''CAN Send'');
}
}
I call can_send from the main every 1 sec, and I get the trace ''CAN Send'' in loopback, and ''CAN Error'' in normal.
Any help will be appreciated.
#can-no-data-loopback-normal #no-hablo-hal
