lib to set the address of the MCP4728
Dependents: MCP4728setaddrProg mbedSerialInterface_talkback2 MCP4728test mbedSerialInterface_sequencer
MCP4728setaddr.cpp
- Committer:
- wbeaumont
- Date:
- 2016-12-12
- Revision:
- 0:19560a1deb3c
- Child:
- 1:1ba04e54bd3c
File content as of revision 0:19560a1deb3c:
#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); }