STM32 CANbootloader 升级功能开发(2)功能接口开发

1. 概述

根据之前的功能实现需求,主要需要实现以下外设的基础功能:

  • CAN接口的接收和发送;
  • flash 擦除、读写操作;

2. CAN接口调试

2.1 CAN功能开启

设置通用过滤器;

指定CAN接收buffer;

开启CAN_FIFO0 接收通路

void CanStart( void )
{
   CanCfgIdListFilter(&hcan);
   hcan.pRxMsg = &gCanRx;

    mStatus = HAL_CAN_Receive_IT(&hcan, CAN_FIFO0);
    if  ( mStatus != HAL_OK )
    {
        CanRecvErro();
    }
}

2.2 CAN接收调试

(1)CAN接收设置过滤器

CAN接收问题:必须设置过滤器,不然无法触发接收中断

__weak void CanCfgIdListFilter( CAN_HandleTypeDef* hcan )
{
    uint16_t mStdIdArray[10] ={0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19};          
    uint16_t *pId = mStdIdArray;
    uint32_t i=0,mNum = sizeof(mStdIdArray)>>1;

    pId++;
    for ( i = 0 ; i <5 ; i++ )
    {
        *pId++ += 0;
    }

    for ( i = 0 ; i < mNum ; i=i+4 )
    {
        CanIdListFilter(hcan,i>>2,&mStdIdArray[i],CAN_FIFO0); 
    }
}

(2)CAN接收中断设置flag判断标志符,用于CAN 命令解析用

void HAL_CAN_RxCpltCallback(CAN_HandleTypeDef* hcan)
{
    HAL_StatusTypeDef mStatus = HAL_OK;

    CAN1_CanRxMsgFlag = 1;

    mStatus = HAL_CAN_Receive_IT(hcan, CAN_FIFO0);
    if  ( mStatus != HAL_OK )
    {
        CanRecvErro();
    }
}

2.3 CAN发送调试

CAN发送直接配置完调用Hal层接口即可,无需其他操作; 配置内容包括如下:

  • 标准帧还是扩展帧
  • 帧ID
  • 远程帧标志位
  • 长度
  • 8 bit data

示例:

void CanSend( void )
{
       static uint32_t mIdx = 0;
    HAL_StatusTypeDef mStatus;
    uint32_t mCnt = 0;

    TxBuf.IDE = CAN_ID_STD;
    TxBuf.StdId = 0x10;
    TxBuf.RTR = CAN_RTR_DATA;
    TxBuf.DLC = 1;
    TxBuf.Data[0] = 1;
    do
    {
        mStatus = HAL_CAN_Transmit_IT(&hcan);
    } while ( HAL_OK != mStatus );  
}

3. Flash接口调试

(1) 擦除操作

擦除指定扇区区间的flash数据 StartPageAddr 起始扇区地址 EndPageAddr 结束扇区地址

FLASH_Status CAN_BOOT_ErasePage(uint32_t StartPageAddr,uint32_t EndPageAddr)
{
    uint32_t i;
    FLASH_Status FLASHStatus=HAL_OK;

    HAL_FLASH_Unlock();
    FLASH_ClearFlag(FLASH_FLAG_EOP | FLASH_FLAG_PGERR | FLASH_FLAG_WRPERR); 
    //FLASH_ClearFlag(FLASH_FLAG_EOP | FLASH_FLAG_PGERR);

    for(i=StartPageAddr;i<=EndPageAddr;i+=PAGE_SIZE)
    {
        FLASH_PageErase(i);
        FLASHStatus = FLASH_WaitForLastOperation(0x8000);
        if(FLASHStatus!=HAL_OK)
        {
            HAL_FLASH_Lock();
            return  FLASHStatus;    
        }
    }
    HAL_FLASH_Lock();
    return FLASHStatus;
}

(2)flash写入函数

STMFLASH_Write(uint32_t WriteAddr,uint32_t *pBuffer,uint32_t NumToWrite)

WriteAddr:要写入flash中的首地址,stm32的flash地址起始于0x0800 0000

pBuffer:数据地址。

NumToWrite:数据长度。

(3)flash读取函数

STMFLASH_Read(uint32_t ReadAddr,uint8_t *pBuffer,uint32_t NumToRead)

ReadAddr:数据的首地址

pBuffer:buffer地址

NumToRead:数据长度

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