337 lines
7.9 KiB
C++
337 lines
7.9 KiB
C++
#include "Kernel\Sys.h"
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#include "Device\Port.h"
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#include "Device\Spi.h"
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#include "AT45DB.h"
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#define Dummy_Byte 0xA5
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AT45DB::AT45DB(Spi* spi)
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{
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debug_printf("\r\nAT45DB::Init \r\n");
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_spi = spi;
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_spi->Stop();
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// 在120M主频下用3000，其它主频不确定是否需要调整
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Retry = 3000;
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//PageSize = 0x210;
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SpiScope sc(_spi);
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// 状态位最后一位决定页大小
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// 读状态寄存器命令
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_spi->Write(0xD7);
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byte status = _spi->Write(Dummy_Byte) & 0x01;
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_spi->Stop();
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// 需要根据芯片来动态识别页大小
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ID = ReadID();
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if(ID == 0x1F260000)
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PageSize = status ? 512 : 528;
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else if(ID == 0x1F240000)
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PageSize = status ? 256 : 264;
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else
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{
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PageSize = 256;
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debug_printf("AT45DB Not Support %p\r\n", ID);
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}
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}
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AT45DB::~AT45DB()
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{
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if(_spi) delete _spi;
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_spi = nullptr;
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}
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// 设置操作地址
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void AT45DB::SetAddr(uint addr)
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{
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/* Send addr high nibble address byte */
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_spi->Write((addr & 0xFF0000) >> 16);
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/* Send addr medium nibble address byte */
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_spi->Write((addr & 0xFF00) >> 8);
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/* Send addr low nibble address byte */
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_spi->Write(addr & 0xFF);
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}
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// 等待操作完成
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bool AT45DB::WaitForEnd()
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{
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SpiScope sc(_spi);
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// 读状态寄存器命令
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_spi->Write(0xD7);
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int retry = Retry;
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byte status = 0;
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/* Loop as long as the memory is busy with a write cycle */
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do
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{
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/* Send a dummy byte to generate the clock needed by the FLASH
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and put the value of the status register in FLASH_Status variable */
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status = _spi->Write(Dummy_Byte);
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}
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while ((status & 0x80) == 0 && --retry); /* Busy in progress */
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// 重试次数没有用完，才返回成功
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return retry > 0;
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}
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// 擦除扇区
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bool AT45DB::Erase(uint sector)
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{
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SpiScope sc(_spi);
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// 扇区擦除命令
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_spi->Write(0x7C);
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SetAddr(sector);
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return WaitForEnd();
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}
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// 擦除页
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bool AT45DB::ErasePage(uint pageAddr)
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{
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SpiScope sc(_spi);
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// 页擦除命令
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_spi->Write(0x81);
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SetAddr(pageAddr);
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return WaitForEnd();
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}
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// 按页写入
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bool AT45DB::WritePage(uint addr, byte* buf, uint count)
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{
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SpiScope sc(_spi);
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// 主存储器页编程命令，带预擦除
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_spi->Write(0x82);
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SetAddr(addr);
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while (count--)
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{
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_spi->Write(*buf);
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buf++;
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}
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//WaitForEnd();
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// 使用第二缓冲区来作为写入
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/*_spi->Write(0x87);
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_spi->Write(Dummy_Byte);
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_spi->Write(Dummy_Byte);
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_spi->Write(Dummy_Byte);
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_spi->Write(Dummy_Byte);
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// 把数据写入缓冲区
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while (count--)
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{
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_spi->Write(*buf);
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buf++;
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}
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_spi->Stop();
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//WaitForEnd();
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SpiScope sc(_spi);
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// 将第二缓冲区的数据写入主存储器（擦除模式）
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_spi->Write(0x86);
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SetAddr(addr & 0xFFFF00);*/
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return WaitForEnd();
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}
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// 写入数据
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bool AT45DB::Write(uint addr, byte* buf, uint count)
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{
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// 地址中不够一页的部分
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uint addr2 = addr % PageSize;
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// 页数
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uint pages = count / PageSize;
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// 字节数中不够一页的部分
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uint singles = count % PageSize;
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if (addr2 == 0) /* 地址按页大小对齐 */
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{
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if (pages == 0) /* count < PageSize */
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{
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return WritePage(addr, buf, count);
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}
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else /* count > PageSize */
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{
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// 逐页写入
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while (pages--)
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{
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WritePage(addr, buf, PageSize);
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addr += PageSize;
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buf += PageSize;
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}
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return WritePage(addr, buf, singles);
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}
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}
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else /* 地址不是页大小对齐 */
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{
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uint num = PageSize - addr2;
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if (pages == 0) /* count < PageSize */
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{
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// 如果要写入的数据跨两页，则需要分两次写入
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if (singles > num) /* (count + addr) > PageSize */
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{
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byte temp = singles - num;
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WritePage(addr, buf, num);
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addr += num;
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buf += num;
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return WritePage(addr, buf, temp);
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}
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else
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{
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return WritePage(addr, buf, count);
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}
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}
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else /* count > PageSize */
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{
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count -= num;
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pages = count / PageSize;
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singles = count % PageSize;
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WritePage(addr, buf, num);
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addr += num;
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buf += num;
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while (pages--)
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{
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WritePage(addr, buf, PageSize);
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addr += PageSize;
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buf += PageSize;
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}
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if (singles != 0)
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{
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WritePage(addr, buf, singles);
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}
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return true;
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}
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}
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}
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// 读取一页
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bool AT45DB::ReadPage(uint addr, byte* buf, uint count)
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{
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SpiScope sc(_spi);
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// 主存储器页读取命令
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_spi->Write(0xD2);
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// 使用第二缓冲区来读取
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//_spi->Write(0xD3);
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SetAddr(addr);
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_spi->Write(Dummy_Byte);
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_spi->Write(Dummy_Byte);
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_spi->Write(Dummy_Byte);
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_spi->Write(Dummy_Byte);
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while (count--)
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{
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*buf = _spi->Write(Dummy_Byte);
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buf++;
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}
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return true;
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}
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// 读取数据
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bool AT45DB::Read(uint addr, byte* buf, uint count)
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{
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// 地址中不够一页的部分
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byte addr2 = addr % PageSize;
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// 页数
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byte pages = count / PageSize;
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// 字节数中不够一页的部分
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byte singles = count % PageSize;
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if (addr2 == 0) /* 地址按页大小对齐 */
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{
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if (pages == 0) /* count < PageSize */
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{
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return ReadPage(addr, buf, count);
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}
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else /* count > PageSize */
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{
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// 逐页写入
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while (pages--)
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{
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ReadPage(addr, buf, PageSize);
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addr += PageSize;
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buf += PageSize;
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}
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return ReadPage(addr, buf, singles);
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}
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}
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else /* 地址不是页大小对齐 */
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{
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byte num = PageSize - addr2;
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if (pages == 0) /* count < PageSize */
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{
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// 如果要写入的数据跨两页，则需要分两次写入
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if (singles > num) /* (count + addr) > PageSize */
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{
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byte temp = singles - num;
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ReadPage(addr, buf, num);
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addr += num;
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buf += num;
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return ReadPage(addr, buf, temp);
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}
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else
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{
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return ReadPage(addr, buf, count);
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}
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}
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else /* count > PageSize */
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{
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count -= num;
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pages = count / PageSize;
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singles = count % PageSize;
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ReadPage(addr, buf, num);
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addr += num;
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buf += num;
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while (pages--)
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{
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ReadPage(addr, buf, PageSize);
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addr += PageSize;
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buf += PageSize;
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}
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if (singles != 0)
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{
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ReadPage(addr, buf, singles);
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}
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return true;
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}
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}
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}
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// 读取编号
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uint AT45DB::ReadID()
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{
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SpiScope sc(_spi);
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// 读ID命令，AT45DB161D的ID是1F260000；其中：1F代表厂商ID；2600代表设备ID；00代表配置符字节数
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_spi->Write(0x9F);
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uint Temp0 = _spi->Write(Dummy_Byte);
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uint Temp1 = _spi->Write(Dummy_Byte);
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uint Temp2 = _spi->Write(Dummy_Byte);
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uint Temp3 = _spi->Write(Dummy_Byte);
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return (Temp0 << 24) | (Temp1 << 16) | (Temp2<<8) | Temp3;
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}
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