uint8 Mf500Read( uint8 reg )
{
uint32 BitMask, AddressMask, Data;
uint8 val, i;
Data = 0;
BitMask = 0;
AddressMask = 0;
for( i = 0; i < sizeof( BusAdjust ); i ++ )
{
if( reg & 1 << i )
AddressMask |= 1 << BusAdjust[i];
BitMask |= 1 << BusAdjust[i];
}
IO1DIR = IO1DIR | BitMask;
IO1CLR = Mf500AlePin;
IO0SET = Mf500RdPin | Mf500WrPin;
IO1SET = Mf500CsPin;
BitMask = ~ BitMask;
IO1PIN = ( IO1PIN & BitMask ) | AddressMask;
IO1SET = Mf500AlePin;
BitMask = ~ BitMask;
IO1CLR = Mf500AlePin;
IO1SET = BitMask;
BitMask = ~ BitMask;
IO1DIR = IO1DIR & BitMask;
IO1CLR = Mf500CsPin;
IO0CLR = Mf500RdPin;
i = 25;
while( -- i );
Data = IO1PIN;
IO0SET = Mf500RdPin;
IO1SET = Mf500CsPin;
val = 0;
for( i = 0; i < sizeof( BusAdjust ); i ++ )
{
if( Data & 1 << BusAdjust[i] )
val |= 1 << i;
}
return val;
}
以上程序為ARM7的，程序不是按位操作的，但是與時序圖可以吻合。
FM1702的則為SPI口操作的，和我的設置有些不一樣，所以就不貼了。
我用的是飛思卡爾8位機9S08，讀寄存器的代碼如下
unsigned char RC500Read(unsigned char Addr)
{
unsigned char AddrL = 0; //低八位地址
unsigned char AddrH = 0; //高八位地址
unsigned char Date = 0;
AddrL = Addr & 0x0f;
AddrH = (Addr & 0xf0)>>4;
PTBDD = 1; //AD0-AD3,Output
PTDDD = 1; //AD4-AD7,OUTput
RC500_ALE = 0;
RC500_CS = 1;
RC500_RD = 1;
RC500_WR = 1;
RC500_ADL = AddrL; //給地址
RC500_ADH = AddrH;
delay_50us (1); //延時50uS
RC500_ALE = 1; //地址鎖存拉高，實則為6位
delay_50us (1); //延時50uS
RC500_ALE = 0; //地址鎖存釋放，鎖存完成
delay_50us (1); //延時50uS，保持地址
PTBDD = 0; //AD0-AD3,input
PTDDD = 0; //AD4-AD7,input
RC500_CS = 0; //片選拉低
RC500_RD = 0; //讀信號
delay_50us (1);
Date = (RC500_ADH << 4)|RC500_ADL; //讀入
RC500_CS = 1; //片選拉低
RC500_RD = 1; //讀信號
return Date;
}
由于IO的原因，我選擇了兩個IO口，每個IO口都是4位，所以拼起來做了一個8位的口。程序基本參考了imzhangx的。
寫寄存器的代碼
void RC500Write(unsigned char Addr,unsigned char Date)
{
unsigned char AddrL = 0; //低八位地址
unsigned char AddrH = 0; //高八位地址
unsigned char DateL = 0; //低八位數據
unsigned char DateH = 0; //高八位數據
AddrL = Addr & 0x0f;
AddrH = (Addr & 0xf0)>>4;
DateL = Date & 0x0f;
DateH = (Date & 0xf0)>>4;
PTBDD = 1; //AD0-AD3,Output
PTDDD = 1; //AD4-AD7,OUTput
RC500_ALE = 0;
RC500_CS = 1;
RC500_RD = 1;
RC500_WR = 1;
RC500_ADL = AddrL; //給地址
RC500_ADH = AddrH;
delay_50us (1); //延時50uS
RC500_ALE = 1; //地址鎖存拉高，實則為6位
delay_50us (1); //延時50uS
RC500_ALE = 0; //地址鎖存釋放，鎖存完成
delay_50us (1); //延時50uS，保持地址
RC500_CS = 0;
RC500_ADL = DateL; //給數據
RC500_ADH = DateH;
RC500_WR = 0;
delay_50us (1); //等待寫入
RC500_CS = 1;
RC500_WR = 1; //寫入完成
}
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