//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; }
//向芯片写数据 int w25qxx_write(uint32_t addr, uint8_t *buf, uint32_t len) { w25qxx_write_no_check(addr, buf, len); return 0; }