初始化完成以下为spi程序：
/*************
***************/
void SPI_SendData(uint8_t data)
{
uint8_t cnt;
for(cnt=0;cnt<8;cnt++)
{
SPI_CLK_L;//拉低
Delay1us(10);//这个延时时间任意，但要大于芯片数据手册上的(纳秒级的)
if(data &0x80)
{
SPI_MOSI_H;
}
else
{
SPI_MOSI_L;
}
data <<= 1;//
Delay1us(10);
SPI_CLK_H;//拉高
Delay1us(10);
}
}
/*****************************************/
uint8_t SPI_ReadData(void)
{
uint8_t i = 0;
uint8_t value=0;
SPI_CLK_H;
Delay1us(2);
for(i=0;i<8;i++)
{
SPI_CLK_L;
value<<=1;
if(SPI_MISO_READ())
{
value |= 0x01;
}
Delay1us(2);
SPI_CLK_H;
Delay1us(2);
}
return value;
}
/*************
等待擦除完成
**************/
void SPI_WaitErase(void)
{
uint8_t status = 0x01;
SPI_CS_L;
SPI_SendData(0x05); //读取状态寄存器命令
do
{
status = SPI_ReadData();
}
while((status&0x01) == 1);
SPI_CS_H;
}
/************
扇区擦除
4k
**************/
void SPI_EraseSector(uint32_t addr)
{
SPI_CLK_L;
SPI_CS_L;
SPI_SendData(0x06);
SPI_CLK_L;
SPI_CS_H;
SPI_CLK_L;
SPI_CS_L;
SPI_SendData(0x20);
SPI_SendData((uint8_t)(addr&0xFF0000)>>16);
SPI_SendData((addr&0xFF00)>>8);
SPI_SendData((addr&0xFF));
SPI_CLK_L;
SPI_CS_H;
SPI_WaitErase();
}
/************
块擦除
32k
**************/
void SPI_EraseBlock(uint32_t addr)
{
SPI_CLK_L;
SPI_CS_L;
SPI_SendData(0x06);
SPI_CLK_L;
SPI_CS_H;
SPI_CLK_L;
SPI_CS_L;
SPI_SendData(0x52);
SPI_SendData((uint8_t)(addr&0xFF0000)>>16);
SPI_SendData((addr&0xFF00)>>8);
SPI_SendData((addr&0xFF));
SPI_CLK_L;
SPI_CS_H;
SPI_WaitErase();
}
/************
块擦除
64k
**************/
void SPI_Erase64kBlock(uint32_t addr)
{
SPI_CLK_L;
SPI_CS_L;
SPI_SendData(0x06);
SPI_CLK_L;
SPI_CS_H;
SPI_CLK_L;
SPI_CS_L;
SPI_SendData(0xd8);
SPI_SendData((uint8_t)(addr&0xFF0000)>>16);
SPI_SendData((addr&0xFF00)>>8);
SPI_SendData((addr&0xFF));
SPI_CLK_L;
SPI_CS_H;
SPI_WaitErase();
}
/*****************
检测设备是否正确
设备ID为ID=0XEF4017
正常才继续后面的页写入和读取数据
******************/
uint32_t SPI_CheckDevice(void)
{
uint8_t temp0,temp1,temp2;
uint32_t Device_ID=0;
SPI_CLK_L;
SPI_CS_L;
SPI_SendData(0x9F);
temp0 = SPI_ReadData();
temp1 = SPI_ReadData();
temp2 = SPI_ReadData();
SPI_CLK_L;
SPI_CS_H;
Device_ID = (temp0<<16) | (temp1<<8) | (temp2);
return Device_ID;
}
/**************
读取数据
readlen： 读取长度
***************/
void SPI_BufferRead(uint8_t *pBuffer,uint32_t addr,uint32_t readlen)
{
SPI_CLK_L;
SPI_CS_L;
SPI_SendData(0x03);//读数据命令
SPI_SendData((uint8_t)(addr&0xFF0000)>>16);
SPI_SendData((addr&0xFF00)>>8);
SPI_SendData((addr&0xFF));
while(readlen--)
{
*pBuffer = SPI_ReadData();
pBuffer++;
}
SPI_CLK_L;
SPI_CS_H;
}
/************
页写入---写入字节数低于256可用页编程
**************/
void SPI_PageWrite(uint8_t *pBuffer,uint32_t addr,uint16_t writelen)
{
SPI_CLK_L;
SPI_CS_L;
SPI_SendData(0x06);
SPI_CLK_L
SPI_CS_H;
SPI_CLK_L;//拉低
SPI_CS_L;
SPI_SendData(0x02);
SPI_SendData((addr&0xFF0000)>>16);
SPI_SendData((addr&0xFF00)>>8);
SPI_SendData((addr&0xFF));
if(writelen>Page_Size)
{
// printf("\r\n页写入最大为256字节\r\n");
writelen = Page_Size ;
}
while(writelen--)
{
SPI_SendData(*pBuffer);
pBuffer++;
}
SPI_CLK_L;//拉低
SPI_CS_H;
SPI_WaitErase();
}
/*************
写入任意长度数据
*pBuffer ：待写入数据
addr ：需写入flash的地址
numToWrite ：待写入数据长度
***************/
void SPI_BufferWrite(uint8_t *pBuffer,uint32_t addr,uint32_t numToWrite)
{
uint32_t count=0,numPage=0,numSingle=0,Addr=0;
Addr = addr%Page_Size;//某个page的地址
count = Page_Size - Addr;//某page剩余字节数
numPage = numToWrite/Page_Size;//待写入的数据占用page数
numSingle = numToWrite%Page_Size;//待写入数据不够一个page的字节数
if(Addr == 0)//在某page 起始位置 1
{
if(numPage==0)//写入字节数小于一个page
{
SPI_PageWrite(pBuffer,addr,numToWrite);
}
else//写入字节数大于等于1个page
{
while(numPage--)
{
SPI_PageWrite(pBuffer,addr,Page_Size);
pBuffer+=Page_Size;
addr+=Page_Size;
}
SPI_PageWrite(pBuffer,addr,numSingle);
}
}
else //在某page的2~256位置
{
if(numPage==0)//写入字节数小于一个page
{
if(numSingle>count)//剩余字节数>该page剩余位置
{
SPI_PageWrite(pBuffer,addr,count);//向该page的剩余位置写入对应字节
pBuffer+=count;
addr+=count;
SPI_PageWrite(pBuffer,addr,(numSingle-count));//其余的写入下一个page
}
else
{
SPI_PageWrite(pBuffer,addr,numToWrite);
}
}
else//写入字节数大于等于一个page
{
numToWrite -= count;
numPage = numToWrite/Page_Size;
numSingle = numToWrite%Page_Size;
SPI_PageWrite(pBuffer,addr,count);//写入该page还可写入的字节数
addr+=count;
pBuffer+=count;
while(numPage--)//page个数
{
SPI_PageWrite(pBuffer,addr,Page_Size);
pBuffer+=Page_Size;
addr+=Page_Size;
}
if(numSingle!=0)//剩余字节数
{
SPI_PageWrite(pBuffer,addr,numSingle);
}
}
}
SPI_WaitErase();
}
/************
数据比较
len :数据长度
不等：0
相等：1
************/
uint8_t pBuffer_Cmp(uint8_t *buffer1,uint8_t *buffer2,uint32_t len)
{
while(len--)
{
if(*buffer1!=*buffer2)
{
return 0;
}
buffer1++;
buffer2++;
}
return 1;
}
uint8_t Write_pBuffer[]={"软件模拟SPI成功!"};
uint8_t Read_pBuffer[3500]={0};
/***********
读写测试,验证是否正常
***********/
void SPI_Test(void)
{
uint32_t Device_ID = 0;
Device_ID = SPI_CheckDevice();
// printf("ID=0x%x \r\n", Device_ID);
if(Device_ID == 0xEF4016)
{
if(comparm.DebugComm & F_DebugStart)
DebgStr_FramProc("SPI FLASH设备正常!\r\n");
SPI_EraseSector(0x001000);//sector1
SPI_BufferWrite(Write_pBuffer,0x001000,(sizeof(Write_pBuffer)/sizeof(*(Write_pBuffer))-1));
SPI_BufferRead(Read_pBuffer,0x001000,(sizeof(Write_pBuffer)/sizeof(*(Write_pBuffer))-1));
if(pBuffer_Cmp(Write_pBuffer,Read_pBuffer,(sizeof(Write_pBuffer)/sizeof(*(Write_pBuffer))-1)) == 1)
{
if(comparm.DebugComm & F_DebugStart)
DebgStr_FramProc("软件模拟SPI的读写数据一致！\r\n");
// DebgStr_FramProc("\r\n 读出的数据为：%s \r\n", Read_pBuffer);
}
else
{
if(comparm.DebugComm & F_DebugStart)
DebgStr_FramProc("软件模拟SPI的读写数据不一致！\r\n");
}
}
else
{
if(comparm.DebugComm & F_DebugStart)
DebgStr_FramProc("SPI FLASH设备异常!\r\n");
}
}
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