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      EEPW首頁 > 嵌入式系統(tǒng) > 設(shè)計應(yīng)用 > Stm32的io口模擬spi例程分析

      Stm32的io口模擬spi例程分析

      作者: 時間:2016-11-27 來源:網(wǎng)絡(luò) 收藏
      以下是硬件電路圖,主芯片為stm32rbt6.

      本文引用地址:http://www.biyoush.com/article/201611/322268.htm

      貼上代碼

      void SPI_FLASH_Init1(void)//io初始化配置
      {

      GPIO_InitTypeDef GPIO_InitStructure;
      RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOC, ENABLE);

      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7 | GPIO_Pin_9;//CS CLK
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_Init(GPIOC, &GPIO_InitStructure);

      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 ;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //MOSI要用模擬輸入
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_Init(GPIOC, &GPIO_InitStructure);

      GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
      GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;//MISO
      GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
      GPIO_Init(GPIOA, &GPIO_InitStructure);

      //關(guān)鍵在讀取函數(shù)
      //包括讀取和發(fā)送
      u8 SPIx_FLASH_SendByte(u8 byte)
      {
      uint8_t i;
      u8 Temp=0x00;
      unsigned char SDI;
      for (i = 0; i < 8; i++)
      {
      GPIO_SetBits(GPIOC, GPIO_Pin_9);//sclk = 0;//先將時鐘拉高
      if (byte&0x80)
      {
      GPIO_SetBits(GPIOC, GPIO_Pin_7); // //SO=1
      }
      else
      {
      GPIO_ResetBits(GPIOC, GPIO_Pin_7);// //SO=0
      }
      byte <<= 1;
      GPIO_ResetBits(GPIOC, GPIO_Pin_9);// //sclk = 1; 拉低時鐘
      SDI = GPIO_ReadInputDataBit(GPIOC, GPIO_Pin_8);//判斷si是否有輸入
      Temp<<=1;

      if(SDI) //讀到1時
      {
      Temp++; //置1 即向右移動一位同時加1 因上邊有<<=1
      }
      GPIO_SetBits(GPIOC, GPIO_Pin_9);//sclk = 0;// 拉高時鐘
      }

      return Temp; //返回讀到miso輸入的值

      }
      }
      //下面是以讀寫spi flash為例具體的實現(xiàn)
      //此函數(shù)中 時鐘機時序很重要。Cs在讀寫中只能出現(xiàn)一次,不能在sendwrite
      //讀寫里邊有,被調(diào)用時還出現(xiàn),就肯定不行了。
      //其它函數(shù)宏定義
      #define BUFFER_1_WRITE 0x84 // buffer 1 write
      #define BUFFER_2_WRITE 0x87 // buffer 2 write
      #define BUFFER_1_READ 0x54 // buffer 1 read (change to 0xD4 for SPI mode 0,3)
      #define BUFFER_2_READ 0x56 // buffer 2 read (change to 0xD6 for SPI mode 0,3)
      #define B1_TO_PAGE_WITH_ERASE 0x83 // buffer 1 to main memory page program with built-in erase
      #define B2_TO_PAGE_WITH_ERASE 0x86 // buffer 2 to main memory page program with built-in erase
      #define B1_TO_PAGE_WITHOUT_ERASE 0x88 // buffer 1 to main memory page program without built-in erase
      #define B2_TO_PAGE_WITHOUT_ERASE 0x89 // buffer 2 to main memory page program without built-in erase
      #define PAGE_PROG_THROUGH_B1 0x82 // main memory page program through buffer 1
      #define PAGE_PROG_THROUGH_B2 0x85 // main memory page program through buffer 2
      #define AUTO_PAGE_REWRITE_THROUGH_B1 0x58 // auto page rewrite through buffer 1
      #define AUTO_PAGE_REWRITE_THROUGH_B2 0x59 // auto page rewrite through buffer 2
      #define PAGE_TO_B1_COMP 0x60 // main memory page compare to buffer 1
      #define PAGE_TO_B2_COMP 0x61 // main memory page compare to buffer 2
      #define PAGE_TO_B1_XFER 0x53 // main memory page to buffer 1 transfer
      #define PAGE_TO_B2_XFER 0x55 // main memory page to buffer 2 transfer
      #define STATUS_REGISTER 0x57
      #define MAIN_MEMORY_PAGE_READ 0x52 // main memory page read (change to 0xD2 for SPI mode 0,3)
      #define PAGE_ERASE 0x81 // erase a 264 byte page
      #define BULK_ERASE 0x50 // erase 8 pages
      #define WIP_Flag 0x80
      #define Dummy_Byte 0xA5
      AT45DB系列的讀寫函數(shù)
      void AT45xxReadx(uint32_t Num,uint32_t PageAddr, uint32_t ByteAddr, uint8_t *
      Data, uint32_t ByteNum)
      {

      SPIx_FLASH_PageToBuffer2(Num,PageAddr);

      SPIx_FLASH_Buffer2Read(Num,Data, ByteAddr, ByteNum);

      }
      寫函數(shù)
      void AT45xxWritex(uint32_t Num,uint32_t PageAddr, uint32_t ByteAddr, u8 *Data
      , uint32_t ByteNum)
      {
      uint32_t i;
      u8 aa[100];

      if((ByteNum <= (528 - ByteAddr))&&(ByteNum > 0))
      {
      SPIx_FLASH_WaitForWriteEnd(Num);
      // while(!(Rat45_status()& 0x80 )); //判斷是否忙

      SPIx_FLASH_CS_LOW(Num);

      SPIx_FLASH_SendByte(Num,0x82);
      // SPIx_ReadWriteByte(0x82);

      // SPIx_ReadWriteByte((uint8_t)(PageAddr>>6));
      // SPIx_ReadWriteByte((uint8_t)((PageAddr<<2)|(ByteAddr>>8)));
      // SPIx_ReadWriteByte((uint8_t)ByteAddr);
      SPIx_FLASH_SendByte(Num,(uint8_t)(PageAddr>>6));
      SPIx_FLASH_SendByte(Num,(uint8_t)((PageAddr<<2)|(ByteAddr>>8)));
      SPIx_FLASH_SendByte(Num,(uint8_t)ByteAddr);


      for(i = 0; i < ByteNum; i++)
      {
      SPIx_FLASH_SendByte(Num,Data[i]);
      // SPIx_ReadWriteByte(Data[i]);
      // SPIx_FLASH_SendByte(Num,Data[i]);
      }

      SPIx_FLASH_CS_HIGH(Num);
      }
      }


      void SPIx_FLASH_WaitForWriteEnd(uint32_t Num)
      {
      unsigned char FLASH_Status = 0;


      SPIx_FLASH_CS_LOW(Num);


      SPIx_FLASH_SendByte(Num,STATUS_REGISTER);


      do
      {

      FLASH_Status = SPIx_FLASH_SendByte(Num,Dummy_Byte);

      }
      while ((FLASH_Status & WIP_Flag) == RESET);


      SPIx_FLASH_CS_HIGH(Num);
      }


      void SPIx_FLASH_Buffer2Read(uint32_t Num,u8* pBuffer, u32 ReadAddr, u16
      NumByteToRead)
      {

      SPIx_FLASH_WaitForWriteEnd(Num);
      // while(!(Rat45_status()& 0x80 )); //判斷是否忙


      SPIx_FLASH_CS_LOW(Num);


      SPIx_FLASH_SendByte(Num,BUFFER_2_READ);


      SPIx_FLASH_SendByte(Num,Dummy_Byte);

      SPIx_FLASH_SendByte(Num,(ReadAddr& 0xFF00) >> 8);

      SPIx_FLASH_SendByte(Num,ReadAddr & 0xFF);

      SPIx_FLASH_SendByte(Num,Dummy_Byte);//


      while (NumByteToRead--)
      {

      *pBuffer = SPIx_FLASH_SendByte(Num,Dummy_Byte);

      pBuffer++;
      }


      SPIx_FLASH_CS_HIGH(Num);
      }


      void SPIx_FLASH_CS_LOW(uint32_t Num)
      {
      switch(Num)
      {
      case 0: GPIO_ResetBits(GPIOB, GPIO_Pin_12); break;
      case 1: GPIO_ResetBits(GPIOA, GPIO_Pin_8); break; //U6
      case 2: GPIO_ResetBits(GPIOA, GPIO_Pin_7); break; //U7
      case 3: GPIO_ResetBits(GPIOA, GPIO_Pin_3); break; //U8
      case 4: GPIO_ResetBits(GPIOC, GPIO_Pin_3); break; //U9
      default:break;
      }

      }

      void SPIx_FLASH_CS_HIGH(uint32_t Num)
      {
      switch(Num)
      {
      case 0: GPIO_SetBits(GPIOB, GPIO_Pin_12); break;
      case 1: GPIO_SetBits(GPIOA, GPIO_Pin_8); break; //U6
      case 2: GPIO_SetBits(GPIOA, GPIO_Pin_7); break; //U7
      case 3: GPIO_SetBits(GPIOA, GPIO_Pin_3); break; //U8
      case 4: GPIO_SetBits(GPIOC, GPIO_Pin_3); break; //U9
      default:break;
      }
      }



      關(guān)鍵詞: Stm32io口模擬sp

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