LPC1788--SSP设置驱动W25Q16--以及特别注意点

来源：互联网发布：程序员职业规划编辑：程序博客网时间：2024/05/16 15:19

简单记录LPC1788学习过程的寄存器操作---SSP学习

寄存器的直接操作可以比较直观学习，深入了解芯片功能！

在学习过程中，发现一点容易被忽视而又很严重的问题---那就是关于SSP1的引脚使用P0[7]-P0[8]-P0[9]时，是W型IO配置。寄存器的第7位很容易被我们设置为0--但是手册上是要求必须为1，否则不能正常工作，这里我走了一点弯路。

#include"ssp_lpc1788.h"

#define SPI_FLASH_PageSize 256 //页大小
#define SPI_FLASH_PerWritePageSize 256 //写页大小

/*----------------初始化SSP0-------------*/
void SSP0_Init(unsigned long sysClk, unsigned spiClk)
{
volatile uint32_t dummy;

  dummy = dummy;

  LPC_IOCON->P2_22 =0x22; // SSP0_SCK
  LPC_IOCON->P2_26 =0x22; // SSP0_MISO
  LPC_IOCON->P2_27 =0x22; // SSP0_MOSI

  LPC_IOCON->P2_23=0x30; //SSP1_CS-直接普通上拉IO
  LPC_GPIO2->DIR |= (1UL << 23); //输出
  LPC_GPIO2->SET|=(1<<23);//置一

  LPC_SC->PCONP |= (1UL << 21); //SSP0 时钟开启

  LPC_SSP0->CR0 = 0x0007; // 8Bit, CPOL=0, CPHA=0
  LPC_SSP0->CR1 = 0x0002; // SSP0-使能-主模式

  LPC_SSP0->CPSR = sysClk/spiClk; //时钟预分频寄存器

  while( LPC_SSP0->SR & ( 1 << 4 ) ); //忙

  while( LPC_SSP0->SR & ( 1 << 2 ) ) //接收FIFO不为空
  {
      dummy = LPC_SSP0->DR; //假读取去清空FIFO
  }

}

/*-------------SSP0-发送数据-----------------*/
void SSP0_WriteByte(unsigned char data)
{
uint8_t Dummy;

LPC_SSP0->DR = data; //载入要发送的数据
while (LPC_SSP0->SR & (1 << 4)){} //等待发送完成
Dummy=LPC_SSP0->DR; //假读取去清空FIFO
}

/*-------------SSP0-接收数据-----------------*/
uint8_t SSP0_RegisterByte(void)
{
LPC_SSP0->DR = 0xFF; //无效指令
while (LPC_SSP0->SR & (1 << 4)){} //忙等待

return (LPC_SSP0->DR); //接收数据
}

/*-----------------------------------SSP1--------------------------*/
/*----------------初始化SSP1-------------*/
void SSP1_Init(unsigned long sysClk, unsigned spiClk)
{
volatile uint32_t dummy;

  LPC_IOCON->P0_7 =0xA2; // SSP1_SCK
  LPC_IOCON->P0_8 =0xA2; // SSP1_MISO
  LPC_IOCON->P0_9 =0xA2; // SSP1_MOSI

  LPC_IOCON->P0_6=0x30; //SSP1_CS-普通上拉IO
  LPC_GPIO0->DIR |= (1UL << 6); //输出
  LPC_GPIO0->SET|=(1<<6);//置一

  LPC_SC->PCONP |= (1UL << 10); //SSP1 时钟开启

  LPC_SSP1->CR0 = 0x0007; // 8Bit, CPOL=0, CPHA=0
  LPC_SSP1->CR1 = 0x0002; // SSP1-使能-主模式

  LPC_SSP1->CPSR = sysClk/spiClk; //时钟预分频寄存器

  while( LPC_SSP1->SR & ( 1 << 4 ) ); //忙

  while( LPC_SSP1->SR & ( 1 << 2 ) ) //接收FIFO不为空
  {
      dummy = LPC_SSP1->DR; //假读取去清空FIFO
  }
}

/*-------------SSP1-发送数据-----------------*/
void SSP1_WriteByte(unsigned char data)
{
uint8_t Dummy;

LPC_SSP1->DR = data; //载入要发送的数据
while (LPC_SSP1->SR & (1 << 4)){} //等待发送完成
Dummy=LPC_SSP1->DR; //假读取去清空FIFO
}

/*-------------SSP1-接收数据-----------------*/
uint8_t SSP1_RegisterByte(void)
{
LPC_SSP1->DR = 0xFF; //无效指令
while (LPC_SSP1->SR & (1 << 4)){} //忙等待

return (LPC_SSP1->DR); //接收数据
}

/*---------------------W25Q16---------------*/
//---------写使能---
void SSP_FLASH_WriteEnable(void)
{
FLASH_CS_LOW();
  SSP0_WriteByte(0x06);
  FLASH_CS_HIGH();
}
//--------等待写完成--
void SSP_FLASH_WaitForWriteEnd(void)
{
  uint16_t i=2000;
  uint8_t FLASH_Status = 0;

  FLASH_CS_LOW();
  SSP0_WriteByte(0x05);
  do
  {
      FLASH_Status = SSP0_RegisterByte();
      i--;
  }
  while (((FLASH_Status & 0x01) == 1)||(i==0));
  FLASH_CS_HIGH();

}

/*----关于擦除---在写入数据之前必须保证被写入的位值是0xff---这就是擦除的作用*/

//-------------扇区擦除----------
void SSP_FLASH_SectorErase(uint32_t SectorAddr)
{
  SSP_FLASH_WriteEnable();//写使能
  SSP_FLASH_WaitForWriteEnd();//忙状态

  FLASH_CS_LOW();//CS=0
  SSP0_WriteByte(0x20);//0x20
  SSP0_WriteByte((SectorAddr & 0xFF0000) >> 16);//擦除扇区起始地址
  SSP0_WriteByte((SectorAddr & 0xFF00) >> 8);
  SSP0_WriteByte(SectorAddr & 0xFF);
  FLASH_CS_HIGH();//CS=1

  SSP_FLASH_WaitForWriteEnd();//忙状态--等待擦除完成
}
//-----------块擦除-------
void SSP_FLASH_BlockErase(uint32_t BlockAddr)
{
  BlockAddr*=65536;//0x010000
  SSP_FLASH_WriteEnable();//写使能
  SSP_FLASH_WaitForWriteEnd();

  FLASH_CS_LOW();
  SSP0_WriteByte(0xD8);//0xD8
  SSP0_WriteByte((BlockAddr & 0xFF0000) >> 16);//擦除块起始地址
  SSP0_WriteByte((BlockAddr & 0xFF00) >> 8);
  SSP0_WriteByte(BlockAddr & 0xFF);
  FLASH_CS_HIGH();

  SSP_FLASH_WaitForWriteEnd();
}
//----------整片擦除--
void SSP_FLASH_BulkErase(void)
{
  SSP_FLASH_WriteEnable(); //写使能

  FLASH_CS_LOW();
  SSP0_WriteByte(0xc7); //整片擦除
  FLASH_CS_HIGH();

  SSP_FLASH_WaitForWriteEnd();
}
//---------单页写入-----
void SSP_FLASH_PageWrite(uint8_t* pBuffer, uint32_t WriteAddr, uint16_t NumByteToWrite)
{
  SSP_FLASH_WriteEnable();

  FLASH_CS_LOW();
  SSP0_WriteByte(0x02);//CMD2--0x02--------页写入
  SSP0_WriteByte((WriteAddr & 0xFF0000) >> 16);//写入起始地址
  SSP0_WriteByte((WriteAddr & 0xFF00) >> 8);
  SSP0_WriteByte(WriteAddr & 0xFF);

  if(NumByteToWrite > SSP_FLASH_PerWritePageSize) //写入数据多余页最大数据
      NumByteToWrite = SSP_FLASH_PerWritePageSize;
  while (NumByteToWrite--)
  {
      SSP0_WriteByte(*pBuffer); //写数据
      pBuffer++;
    }
  FLASH_CS_HIGH();

  SSP_FLASH_WaitForWriteEnd();
}
//--------多页写入---
void SSP_FLASH_BufferWrite(uint8_t* pBuffer, uint32_t WriteAddr, uint16_t NumByteToWrite)
{
  uint8_t NumOfPage = 0, NumOfSingle = 0, Addr = 0, count = 0, temp = 0;

  Addr = WriteAddr % SSP_FLASH_PageSize; //首页地址
  count = SSP_FLASH_PageSize - Addr;//首页要写入的数据个数
  NumOfPage = NumByteToWrite / SSP_FLASH_PageSize;//页数
  NumOfSingle = NumByteToWrite % SSP_FLASH_PageSize; //余数--最后一页不满一页个数

  if (Addr == 0)
  {
      if (NumOfPage == 0) //只有一页
  {
          SSP_FLASH_PageWrite(pBuffer, WriteAddr, NumByteToWrite); //Ö±½ÓÐ´Èë
      }
      else //多页
      {
          while (NumOfPage--) //写满页的数据
          {
              SSP_FLASH_PageWrite(pBuffer, WriteAddr, SSP_FLASH_PageSize);
              WriteAddr += SSP_FLASH_PageSize;
              pBuffer += SSP_FLASH_PageSize;
          }

          SSP_FLASH_PageWrite(pBuffer, WriteAddr, NumOfSingle);//写最后不满一页的数据
      }
  }
  else
  {
      if (NumOfPage == 0)
  {
          if (NumOfSingle > count)
          {
              temp = NumOfSingle - count;
              SSP_FLASH_PageWrite(pBuffer, WriteAddr, count);
              WriteAddr += count;
              pBuffer += count;

              SSP_FLASH_PageWrite(pBuffer, WriteAddr, temp);
          }
          else
          {
              SSP_FLASH_PageWrite(pBuffer, WriteAddr, NumByteToWrite);
          }
      }
      else
      {
          NumByteToWrite -= count;
          NumOfPage = NumByteToWrite / SSP_FLASH_PageSize;
          NumOfSingle = NumByteToWrite % SSP_FLASH_PageSize;

          SSP_FLASH_PageWrite(pBuffer, WriteAddr, count);
          WriteAddr += count;
          pBuffer += count;

          while (NumOfPage--)
          {
              SSP_FLASH_PageWrite(pBuffer, WriteAddr, SSP_FLASH_PageSize);
              WriteAddr += SSP_FLASH_PageSize;
              pBuffer += SSP_FLASH_PageSize;
          }

          if (NumOfSingle != 0)
          {
              SSP_FLASH_PageWrite(pBuffer, WriteAddr, NumOfSingle);
          }
      }
  }
}
//--------读数据-----------
void SSP_FLASH_BufferRead(uint8_t* pBuffer, uint32_t ReadAddr, uint16_t NumByteToRead)
{
  FLASH_CS_LOW();
  SSP0_WriteByte(0x03); //CMD3--0x03-----//读数据
  SSP0_WriteByte((ReadAddr & 0xFF0000) >> 16);
  SSP0_WriteByte((ReadAddr& 0xFF00) >> 8);
  SSP0_WriteByte(ReadAddr & 0xFF);

  while (NumByteToRead--)
  {
      *pBuffer = SSP0_RegisterByte();//读入到指定数组
      pBuffer++;
  }
  FLASH_CS_HIGH();
}

/*-----------读取厂家ID------------*/
uint32_t SSP_FLASH_ReadID(void)
{
  uint32_t temp1=0,temp2=0,temp3=0,temp=0;

  LPC_GPIO0->CLR|=(1<<6); //CS=0

  SSP1_WriteByte(0x9F); //读取ID指令
  temp1 =SSP1_RegisterByte(); //厂家编号
  temp2 =SSP1_RegisterByte();//存储类型
  temp3 =SSP1_RegisterByte();//容量

  temp =(temp1<<16)|(temp2<<8)|(temp3);

  LPC_GPIO0->SET|=(1<<6);//CS=1;

  return temp;

}

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