V9_PMU/Src/can.c

/**
  ******************************************************************************
  * File Name          : CAN.c
  * Description        : This file provides code for the configuration
  *                      of the CAN instances.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2020 STMicroelectronics.
  * All rights reserved.</center></h2>
  *
  * This software component is licensed by ST under BSD 3-Clause license,
  * the "License"; You may not use this file except in compliance with the
  * License. You may obtain a copy of the License at:
  *                        opensource.org/licenses/BSD-3-Clause
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "can.h"

/* USER CODE BEGIN 0 */
#include <string.h>
/* USER CODE END 0 */

CAN_HandleTypeDef hcan;
//采样点计算
//(1+bs1)/(1+bs1+bs2) = 1 + 3 / 1 + 3 + 2 = 66.6%
//                      1 + 9 / 1 + 9 + 2 = 83.3%
/* CAN init function */
void MX_CAN_Init(void)
{

  hcan.Instance = CAN1;
  hcan.Init.Prescaler = 6;        //6 1M   12 500k     3 1 9 2 1m 采样点计算 
  hcan.Init.Mode = CAN_MODE_NORMAL; 
  hcan.Init.SyncJumpWidth = CAN_SJW_1TQ;
  hcan.Init.TimeSeg1 = CAN_BS1_3TQ;
  hcan.Init.TimeSeg2 = CAN_BS2_2TQ;
  // hcan.Init.SyncJumpWidth = CAN_SJW_1TQ;
  // hcan.Init.TimeSeg1 = CAN_BS1_9TQ;
  // hcan.Init.TimeSeg2 = CAN_BS2_2TQ;
  hcan.Init.TimeTriggeredMode = DISABLE;
  hcan.Init.AutoBusOff = ENABLE;
  hcan.Init.AutoWakeUp = DISABLE;
  hcan.Init.AutoRetransmission = DISABLE;
  hcan.Init.ReceiveFifoLocked = DISABLE;
  hcan.Init.TransmitFifoPriority = ENABLE;
  if (HAL_CAN_Init(&hcan) != HAL_OK)
  {
    Error_Handler();
  }

}

void HAL_CAN_MspInit(CAN_HandleTypeDef* canHandle)
{

  GPIO_InitTypeDef GPIO_InitStruct = {0};
  if(canHandle->Instance==CAN1)
  {
  /* USER CODE BEGIN CAN1_MspInit 0 */

  /* USER CODE END CAN1_MspInit 0 */
    /* CAN1 clock enable */
    __HAL_RCC_CAN1_CLK_ENABLE();

    __HAL_RCC_GPIOA_CLK_ENABLE();
    /**CAN GPIO Configuration
    PA11     ------> CAN_RX
    PA12     ------> CAN_TX
    */
    GPIO_InitStruct.Pin = GPIO_PIN_11;
    GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

    GPIO_InitStruct.Pin = GPIO_PIN_12;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

    /* CAN1 interrupt Init */
    HAL_NVIC_SetPriority(USB_LP_CAN1_RX0_IRQn, 0, 0);
    HAL_NVIC_EnableIRQ(USB_LP_CAN1_RX0_IRQn);
  /* USER CODE BEGIN CAN1_MspInit 1 */

  /* USER CODE END CAN1_MspInit 1 */
  }
}

void HAL_CAN_MspDeInit(CAN_HandleTypeDef* canHandle)
{

  if(canHandle->Instance==CAN1)
  {
  /* USER CODE BEGIN CAN1_MspDeInit 0 */

  /* USER CODE END CAN1_MspDeInit 0 */
    /* Peripheral clock disable */
    __HAL_RCC_CAN1_CLK_DISABLE();

    /**CAN GPIO Configuration
    PA11     ------> CAN_RX
    PA12     ------> CAN_TX
    */
    HAL_GPIO_DeInit(GPIOA, GPIO_PIN_11|GPIO_PIN_12);

    /* CAN1 interrupt Deinit */
    HAL_NVIC_DisableIRQ(USB_LP_CAN1_RX0_IRQn);
  /* USER CODE BEGIN CAN1_MspDeInit 1 */

  /* USER CODE END CAN1_MspDeInit 1 */
  }
}

/* USER CODE BEGIN 1 */

/* USER CODE END 1 */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/