//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;
}
//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;
}
//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;
}
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];
}
//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;
}