Diff: MCP4728setaddr.cpp

Revision:

0:19560a1deb3c

Child:

1:1ba04e54bd3c

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MCP4728setaddr.cpp	Mon Dec 12 17:37:03 2016 +0000
@@ -0,0 +1,86 @@
+
+#include "mbed.h"
+
+#include "MCP4728setaddr.h"
+#include "I2CInterface.h" 
+//#include "dev_interface_def.h"
+
+
+
+#define MCP4728_baseaddr 0xC0
+#define MCP4728_readaddresscmd 0xC
+ 
+ 
+MPC4728_address_set::MPC4728_address_set(PinName sclcntpin, DigitalOut *LDACpin, I2CInterface* i2cdevice, DigitalOut *Cntoutpin , bool ldac_invert  ): cntin(sclcntpin) {
+        i2cd=i2cdevice;
+        LDAC=LDACpin;
+        Cntout=Cntoutpin;
+        *Cntoutpin=0;
+        if (ldac_invert )  { ldac1 = 0; ldac0=1;}
+        else  { ldac1 = 1; ldac0=0;}
+        *LDAC=ldac1;
+         i2cd->frequency(40000); // interrupt is slow, so set to 40 kHz 
+        
+ }        
+
+void MPC4728_address_set::count_down( ){
+        sclcnt--;
+        *Cntout=1;
+        *Cntout=0;
+        if ( sclcnt==0){ 
+            //disable this interrupt 
+            int wait=10;  while ( wait--);
+            *LDAC=ldac0;
+        }
+ }
+ 
+
+
+int MPC4728_address_set::readaddress(char* address, char *eepromaddr , char *regaddr ) {
+          *LDAC=ldac1;
+        start_scl_cnt(18);// 1+9+8 faling edges 
+        *address=0x0C; // not allowed value
+        char cmd = MCP4728_readaddresscmd;
+        int i2cresult=i2cd->write(0, &cmd, 1,true ); //1 byte don't send stop  
+        if  ( i2cresult ) {  // <> 0 
+            //i2cd->abort_transfer  (  );
+            i2cd->stop();
+            *address=0xFF;
+            return i2cresult ;
+        }
+        i2cresult=i2cd->read(MCP4728_baseaddr, &cmd, 1,false ); 
+        if ( i2cresult) *address=0xFE;
+        else {
+             *address=cmd;
+             *regaddr= cmd >>1;
+             *regaddr= *regaddr& 0x7;
+             *eepromaddr = cmd>>5;
+             *eepromaddr = *eepromaddr & 0x7 ;
+        }
+        *LDAC=ldac1;
+        return i2cresult ;
+}    
+
+
+  int MPC4728_address_set::setaddress(char currentaddress, char newaddress ){  // both address 
+       *LDAC=ldac1;
+        char oldaddr=0x7 & currentaddress;oldaddr=oldaddr<<1;
+        char newaddr=0x7 & newaddress; 
+        newaddr= newaddr<<2;
+        char address=MCP4728_baseaddr | oldaddr;oldaddr=oldaddr<<1;
+        const char cmdtype= 0x60;  // 0x011000000   0x011AAA0
+        char  data[3] ;
+        data[0]= cmdtype | oldaddr | 1; //0x011OOO01
+        data[1]= cmdtype | newaddr | 2; //0x011NNN10
+        data[2]= cmdtype | newaddr | 3; //0x011NNN11
+        printf( "cmd %x %x data %x %x %x \n\r", newaddress, newaddr,(int)data[0],(int)data[1],(int)data[2]);
+         start_scl_cnt(18);//1+ 9+8 faling edges 
+        int i2cresult=i2cd->write(address, data, 3,false ); //3 bytes sent and stop
+        *LDAC=ldac1;
+        return i2cresult ;
+   }
+
+  void MPC4728_address_set::start_scl_cnt(int cnts) {
+    sclcnt= cnts; 
+    cntin.fall(this, &MPC4728_address_set::count_down);    
+  }