stm32 mcp2551驱动程序

以下是基于STM32的MCP2551驱动程序示例：

#include "stm32f4xx.h"
#include "stm32f4xx_gpio.h"
#include "stm32f4xx_can.h"
#include "misc.h"

#define CANx CAN1
#define CAN_CLK RCC_APB1Periph_CAN1
#define CAN_RX_PIN GPIO_Pin_0
#define CAN_TX_PIN GPIO_Pin_1
#define CAN_GPIO_PORT GPIOB
#define CAN_GPIO_CLK RCC_AHB1Periph_GPIOB
#define CAN_AF GPIO_AF_CAN1

void CAN_Config(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  CAN_InitTypeDef        CAN_InitStructure;
  CAN_FilterInitTypeDef  CAN_FilterInitStructure;
  
  RCC_AHB1PeriphClockCmd(CAN_GPIO_CLK, ENABLE);
  RCC_APB1PeriphClockCmd(CAN_CLK, ENABLE);

  GPIO_InitStructure.GPIO_Pin = CAN_TX_PIN | CAN_RX_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_High_Speed;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_UP;
  GPIO_Init(CAN_GPIO_PORT, &GPIO_InitStructure);

  GPIO_PinAFConfig(CAN_GPIO_PORT, GPIO_PinSource0, CAN_AF);
  GPIO_PinAFConfig(CAN_GPIO_PORT, GPIO_PinSource1, CAN_AF);

  CAN_DeInit(CANx);
  CAN_StructInit(&CAN_InitStructure);
  
  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_InitStructure.CAN_SJW = CAN_SJW_1tq;
  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_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);
}

void CAN_SendData(uint8_t* data, uint8_t len, uint32_t id)
{
  CanTxMsg TxMessage;
  uint8_t i;
  
  TxMessage.StdId = id;
  TxMessage.RTR = CAN_RTR_DATA;
  TxMessage.IDE = CAN_ID_STD;
  TxMessage.DLC = len;
  for(i = 0; i < len; i++)
  {
    TxMessage.Data[i] = data[i];
  }
  CAN_Transmit(CANx, &TxMessage);
}

int main(void)
{
  uint8_t data[8] = {1, 2, 3, 4, 5, 6, 7, 8};
  
  CAN_Config();
  
  while(1)
  {
    CAN_SendData(data, 8, 0x123);
    delay_ms(1000);
  }
}

以上示例中，我们使用了STM32F4的CAN1模块来驱动MCP2551。首先进行了GPIO和CAN的初始化配置，然后通过CAN_SendData函数发送数据，其中需要指定数据内容、数据长度和CAN ID。可以根据实际需求修改其中的参数。