134 lines
3.1 KiB
C++
134 lines
3.1 KiB
C++
#include "AT24CXX.h"
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/*
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AT24C02的存储容量为2K bit，内容分成32页，每页8Byte，共256Byte，操作时有两种寻址方式：芯片寻址和片内子地址寻址
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（1）芯片寻址：AT24C02的芯片地址为1010，其地址控制字格式为1010A2A1A0R/W。其中A2，A1，A0可编程地址选择位。
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A2，A1，A0引脚接高、低电平后得到确定的三位编码，与1010形成7位编码，即为该器件的地址码。R/W为芯片读写控制位，该位为0，表示芯片进行写操作。
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（2）片内子地址寻址：芯片寻址可对内部256B中的任一个进行读/写操作，其寻址范围为00~FF，共256个寻址单位。
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*/
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#define AT24C01 127
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#define AT24C02 255
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#define AT24C04 511
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#define AT24C08 1023
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#define AT24C16 2047
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#define AT24C32 4095
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#define AT24C64 8191 //256 Pages of 32 bytes
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#define AT24C128 16383 //256 Pages of 64bytes
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#define AT24C256 32767 //512 Pages of 64bytes
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#define AT24C512 65535 //512 Pages of 128bytes
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#define EE_PAGES 512 //存储器页数目
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#define EE_BYTES 128 //每页字节数目
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#define EE_TYPE AT24C512//存储器型号
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#define EE_TDEA 10 //页延时 ms
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AT24CXX::AT24CXX()
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{
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IIC = nullptr;
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// A2A1A0都接低电平时，地址为 1010000，也就是0x50
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// 7位地址，到了I2C那里，需要左移1位
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Address = 0x50;
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}
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AT24CXX::~AT24CXX()
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{
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delete IIC;
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IIC = nullptr;
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}
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void AT24CXX::Init()
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{
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debug_printf("\r\nAT24CXX::Init Address=0x%02X \r\n", Address);
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IIC->SubWidth = 1;
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IIC->Address = Address << 1;
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IIC->Open();
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// 等待可用
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int retry = 5;
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while (retry-- > 0 && Read(0, 4).Length() < 4) Sys.Sleep(1);
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}
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bool AT24CXX::Write(ushort addr, byte data)
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{
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if (!IIC) return false;
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return IIC->Write(addr & 0xFF, data);
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}
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byte AT24CXX::Read(ushort addr) const
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{
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if (!IIC) return 0;
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return IIC->Read(addr & 0xFF);
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}
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bool AT24CXX::Write(uint addr, const Buffer& bs) const
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{
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if (!IIC) return false;
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// 单页最大只能写入8个
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int index = 0;
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int count = bs.Length();
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while (count > 0) {
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int size = 8;
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if (size > count) size = count;
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if (!IIC->Write((ushort)addr, bs.Sub(index, size))) return false;
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addr += size;
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index += size;
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count -= size;
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// 内部存储数据，忙！等1ms差点点，等5ms足够了。手册规定10ms
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Sys.Sleep(5);
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}
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return true;
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}
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bool AT24CXX::Read(uint addr, Buffer& bs) const
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{
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if (!IIC) return false;
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int len = IIC->Read((ushort)addr, bs);
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if (len == 0) return false;
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if (len != bs.Length()) bs.SetLength(len);
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return true;
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}
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ByteArray AT24CXX::Read(ushort addr, int count) const
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{
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ByteArray bs;
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bs.SetLength(count);
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if (!Read(addr, bs)) bs.SetLength(0);
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return bs;
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}
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ushort AT24CXX::Read16(ushort addr) const
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{
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if (!IIC) return 0xFFFF;
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return IIC->Read2(addr);
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}
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uint AT24CXX::Read32(ushort addr) const
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{
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if (!IIC) return 0xFFFFFFFF;
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return IIC->Read4(addr);
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}
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bool AT24CXX::Write(ushort addr, ushort data)
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{
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return Write(addr, Buffer(&data, 2));
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}
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bool AT24CXX::Write(ushort addr, uint data)
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{
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return Write(addr, Buffer(&data, 4));
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}
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