コード例 #1
0
ファイル: w25qxx.c プロジェクト: zwzmzd/kl02z
//芯片探测
static int w25qxx_probe(void)
{
    uint32_t i;
    uint16_t id;
    uint8_t buf[2];

    /* read id */
    spi_xfer(W25X_ManufactDeviceID, W25QXX_CS_LOW);
    spi_xfer(0, W25QXX_CS_LOW);
    spi_xfer(0, W25QXX_CS_LOW);
    spi_xfer(0, W25QXX_CS_LOW);
    buf[0] = spi_xfer(0, W25QXX_CS_LOW);
    buf[1] = spi_xfer(0, W25QXX_CS_HIGH);
    id = ((buf[0]<<8) + buf[1]);
    W25QXX_TRACE("ID:0x%X\r\n", id);
    //see if we find a match
    for(i = 0; i< ARRAY_SIZE(w25qxx_tbl);i++)
    {
        if(w25qxx_tbl[i].id == id)
        {
            /* find a match */
            w25_dev.attr = w25qxx_tbl[i];
            w25qxx_power_up();
            buf[0] = w25qxx_read_sr();
            W25QXX_TRACE("SR:0x%X\r\n", buf[0]);
            buf[0] = w25qxx_read_sr2();
            W25QXX_TRACE("SR2:0x%X\r\n", buf[0]);
            // enable full access to all memory regin, something like unlock chip.
            w25qxx_write_sr(0x00);
            return 0; 
        }
    }
    return 1;
}
コード例 #2
0
//芯片探测
int w25qxx_probe(void)
{
    uint32_t i;
    uint16_t id;
    uint8_t buf[4];
    buf[0] = W25X_ManufactDeviceID;
    buf[1] = 0;
    buf[2] = 0;
    buf[3] = 0;
    /* read id */
    spi_write(&device, buf, 4, false);
    spi_read(&device, buf, 2, true);
    id = ((buf[0]<<8) + buf[1]);
    W25QXX_TRACE("ID:%d\r\n", id);
    //see if we find a match
    for(i = 0; i< ARRAY_SIZE(w25qxx_attr_table);i++)
    {
        if(w25qxx_attr_table[i].id == id)
        {
            // find a match
            w25qxx_type.name = w25qxx_attr_table[i].name;
            w25qxx_type.id = w25qxx_attr_table[i].id;
            w25qxx_type.size = w25qxx_attr_table[i].size;
            w25qxx_power_up();
            buf[0] = w25qxx_read_sr();
            W25QXX_TRACE("SR:0x%X\r\n", buf[0]);
            buf[0] = w25qxx_read_sr2();
            W25QXX_TRACE("SR2:0x%X\r\n", buf[0]);
            // enable full access to all memory regin, something like unlock chip.
            w25qxx_write_sr(0x00);
            return SPI_EOK; 
        }
    }
    return SPI_ERROR;
}
コード例 #3
0
ファイル: w25qxx.c プロジェクト: zwzmzd/kl02z
//写数据
static int w25qxx_write_no_check(uint32_t addr, uint8_t *buf, uint32_t len)  
{ 			 		 
	uint16_t pageremain;	   
        W25QXX_TRACE("w25qxx - write_no_check: addr:%d len:%d\r\n", addr, len);
    
	pageremain = w25_dev.attr.page_size-(addr%w25_dev.attr.page_size); //单页剩余的字节数		 	    
	if(len <= pageremain) pageremain = len;//不大于256个字节
	while(1)
	{	   
           if(w25qxx_write_page(addr, buf, pageremain))
           {
              return 1;
           }
	   if(len == pageremain)break;//写入结束了
	   else //NumByteToWrite>pageremain
	   {
		buf += pageremain;
		addr += pageremain;	
		len -= pageremain;			  //减去已经写入了的字节数
		if(len > 256)pageremain=256; //一次可以写入256个字节
		else pageremain = len; 	  //不够256个字节了
	    }
	}
    return 0;
} 
コード例 #4
0
static uint8_t w25qxx_read_sr(void)
{
    uint8_t buf[1];
    buf[0] = W25X_ReadStatusReg;
    spi_write(&device, buf, 1, false); //false = 保持片选,继续发送
    spi_read(&device, buf, 1, true);
    W25QXX_TRACE("W25QXX BUSY\r\n", buf[0]);
    return buf[0];
}
コード例 #5
0
//向芯片写数据
int w25qxx_write(uint32_t addr, uint8_t *buf, uint32_t len)  
{ 
	uint32_t secpos;
	uint16_t secoff;
	uint16_t secremain;	   
 	uint16_t i;    
	uint8_t * mem_pool;
    mem_pool = SPI_FLASH_BUFFER;
 	secpos = addr/4096;//扇区地址  
	secoff = addr%4096;//在扇区内的偏移
	secremain = 4096-secoff;//扇区剩余空间大小   

 	if(len <= secremain)secremain = len;//不大于4096个字节
	while(1) 
	{	
        w25qxx_read(secpos*4096, mem_pool, 4096); //读出整个扇区的内容
		for(i = 0; i < secremain; i++)//校验数据
		{
			if(mem_pool[secoff+i]!=0XFF)break;//需要擦除  	  
		}
		if(i<secremain)//需要擦除
		{
            w25qxx_erase_sector(secpos*4096); //擦除这个扇区
			for(i=0;i<secremain;i++)	   //复制原来的数据
			{
				mem_pool[i+secoff]=buf[i];	  
			}
            w25qxx_write_no_check(secpos*4096, mem_pool,4096); //写入整个扇区 
		}else 
        {
            W25QXX_TRACE("no need to erase -addr:%d\r\n", addr);
            w25qxx_write_no_check(addr, buf, secremain);//写已经擦除了的,直接写入扇区剩余区间. 
        }			   
		if(len == secremain)break;//写入结束了
		else//写入未结束
		{
			secpos++;//扇区地址增1
			secoff=0;//偏移位置为0 	 

		   	buf += secremain;  //指针偏移
			addr += secremain;//写地址偏移	   
		   	len -= secremain;				//字节数递减
			if(len > 4096) secremain = 4096;	//下一个扇区还是写不完
			else secremain = len;			//下一个扇区可以写完了
		}	 
	}
    return SPI_EOK;
}