Diff: AT93C56A.cpp

Revision:

0:34cce085d32e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/AT93C56A.cpp	Fri Jul 17 12:05:06 2015 +0000
@@ -0,0 +1,91 @@
+#include "AT93C56A.h"
+#include "mbed.h"
+
+AT93C56A::AT93C56A(PinName eecs,PinName eeck,PinName eedi,PinName eedo): _eecs(eecs),_eeck(eeck),_eedi(eedi),_eedo(eedo){
+    _eecs=0;  // Active High State
+    _eeck=0;
+};
+ 
+void AT93C56A::vSend(unsigned short usCommand)
+{
+    signed char i=10;
+    _eedi=1;        //SB
+    _eecs=1;        // Chip Select High
+    wait_us(1);  // SB Clock Generation
+    _eeck=1;
+    wait_us(1);
+    _eeck=0;
+    while(i>=0)
+    {
+        _eedi = (usCommand>>i)&0x01;
+        i--;
+        wait_us(1);
+        _eeck=1;
+        wait_us(1);
+        _eeck=0;
+    }
+}
+void AT93C56A::vWriteEnable()
+{
+    vSend(EE_EWEN);
+    wait_us(1);
+    _eecs=0;  //Chip Select Low
+}
+void AT93C56A::vWriteDisable()
+{
+    vSend(EE_EWDS);
+    wait_us(1);
+    _eecs=0;  //Chip Select Low
+}
+void AT93C56A::vErase(unsigned short usAddr)
+{
+    vSend(EE_ERASE|usAddr);
+    wait_us(1);
+    _eecs=0;
+/** wait busy flag clear */
+    wait_us(1);     // tcs > 250ns @2.7V
+    _eecs=1;
+    wait_us(1);     // tsv < 250ns @2.7V
+    while(_eedo==0); // 0.1ms < twp < 10ms 
+    _eecs=0;
+}
+void AT93C56A::vWrite(unsigned short usAddr, unsigned char ucData)
+{
+    signed char i=7;
+    vSend(EE_WRITE|usAddr);
+    for(i=7;i>=0;i--)
+    {
+        _eedi = (int)( (ucData>>i)&0x0001 );
+        wait_us(1);
+        _eeck=1;
+        wait_us(1);
+        _eeck=0;
+    }
+    _eecs=0;
+/** wait busy flag clear */
+    wait_us(1);     // tcs > 250ns @2.7V
+    _eecs=1;
+    wait_us(1);     // tsv < 250ns @2.7V
+    while(_eedo==0); // 0.1ms < twp < 10ms 
+    _eecs=0;
+}
+unsigned char AT93C56A::ucRead(unsigned short usAddr)
+{
+    unsigned char data=0;
+    signed char i=7;
+    
+    vSend(EE_READ|usAddr);
+    wait_us(1);
+    
+    for(i=7;i>=0;i--)
+    {
+        _eeck=1;
+        wait_us(1);
+        _eeck=0;
+        data = data | (_eedo<<i);
+        wait_us(1);
+    }
+    _eecs=0;
+    
+    return data;
+}
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