Hello,
i'm using MPL3115A2 with EK-TM4C123GXL launchpad. I created code to signle read and mulitread to communicate with sensor. My problem is that i can't communicate with sensor when i'm not debugging code - when i download code to launchpad and check everyline in code ( F6 step over) everything works perfect. I'm able to read all registers that i need. - so next in debug mode i run program and it's works fine - i can see received values in terminal. Problem appears when i turn off launchpad and turn it on back (ofcorse programed). I can't see any values in terminal (only 0's), so then i debugg code again - when i press run in debugg mode it also doesn;t work, but when i reset uC, check 1st line where i read sensor ID and then run program, it works again. I will add that i try to read sensor in Timer ISR - timer is trigered 4 times per sec.
i'm trying to fix this but i cant find any reason what is going on. Here's osciliscope screen:
1st - when i can't communicate with sensor
2nd - single read and double read after uC reset, check everyline and then run:
Hope you will give me some advice, here's how i setup sensor:
k=i2c_write(0x60, 0x26,0x00);
k=i2c_write(0x60, 0x26,0xB9);
k=i2c_write(0x60, 0x27,0x02);
i2c_read(0x60,0x26, &k);
i2c_read(0x60,0x27, &k);
and here's mu functions
/////////////////////read data from i2c addre - is address of sensor 0x60, data is register
void i2c_read(char addre, unsigned long data,short *receive){
unsigned long k=0;
I2CMasterSlaveAddrSet(I2C1_BASE,addre,false); //setup slave address with last bit 0
I2CMasterDataPut(I2C1_BASE,data); //put data
I2CMasterControl(I2C1_BASE,I2C_MASTER_CMD_BURST_SEND_START); // start transmistion
while(!I2CMasterBusy(I2C1_BASE)); //wait when bus is busy
while(I2CMasterBusy(I2C1_BASE));
I2CMasterSlaveAddrSet(I2C1_BASE,addre,true); //setup address again
I2CMasterControl(I2C1_BASE,I2C_MASTER_CMD_SINGLE_RECEIVE); //start receive data
k=I2CMasterErr(I2C1_BASE);
while(I2CMasterBusy(I2C1_BASE));
while(I2CMasterBusy(I2C1_BASE));
tab[0]=I2CMasterErr(I2C1_BASE); //check errors
k=I2CMasterDataGet(I2C1_BASE); // take data
*receive=k;
I2CMasterControl(I2C1_BASE,I2C_MASTER_CMD_BURST_RECEIVE_FINISH);
////////////write to sensor///
}
unsigned long i2c_write(char address, unsigned long reg,unsigned long data){
unsigned long k=0;
I2CMasterSlaveAddrSet(I2C1_BASE,address,false); //setup slave address with last bit 0
I2CMasterDataPut(I2C1_BASE,reg); //put data reg address
I2CMasterControl(I2C1_BASE,I2C_MASTER_CMD_BURST_SEND_START); // start transmistion
while(!I2CMasterBusy(I2C1_BASE));
while(I2CMasterBusy(I2C1_BASE));
k=I2CMasterErr(I2C1_BASE);
I2CMasterDataPut(I2C1_BASE,data); // data to write
k=I2CMasterErr(I2C1_BASE);
I2CMasterControl(I2C1_BASE,I2C_MASTER_CMD_BURST_SEND_FINISH); //finish
k=I2CMasterErr(I2C1_BASE); //check error
return k;
}
void i2c_multi_read(char address, unsigned data, unsigned repeat, short tab[] ){
unsigned long k=0,err=0,i=0;
I2CMasterSlaveAddrSet(I2C1_BASE,address,true); //false
I2CMasterDataPut(I2C1_BASE,data);
I2CMasterControl(I2C1_BASE,I2C_MASTER_CMD_BURST_SEND_START);
while(I2CMasterBusy(I2C1_BASE));
while(I2CMasterBusy(I2C1_BASE));
I2CMasterSlaveAddrSet(I2C1_BASE,address,true);
I2CMasterControl(I2C1_BASE,I2C_MASTER_CMD_BURST_RECEIVE_START );
SysCtlDelay(10);
while(I2CMasterBusy(I2C1_BASE));
while(I2CMasterBusy(I2C1_BASE));
tab[0]=I2CMasterDataGet(I2C1_BASE);//no dummy read
tab[5]=I2CMasterErr(I2C1_BASE);
for(i=0;i<repeat;i++){
I2CMasterControl(I2C1_BASE,I2C_MASTER_CMD_BURST_RECEIVE_CONT);
//while(!I2CMasterBusy(I2C1_BASE));
while(I2CMasterBusy(I2C1_BASE));
while(I2CMasterBusy(I2C1_BASE));
SysCtlDelay(10);
tab[i+1]=I2CMasterDataGet(I2C1_BASE);
if (I2CMasterErr(I2C1_BASE)!=0){tab[6]=I2CMasterErr(I2C1_BASE);}
}
I2CMasterControl(I2C1_BASE,I2C_MASTER_CMD_BURST_RECEIVE_FINISH);
}
