ST micro LIS3LV02DL accelerometer interfacing

[devil6600]

hi,

i am trying to read data from an accelerometer (ST micro LIS3LV02DL) through SPI.
I used shiftin and shiftout command in picbasic pro but not able to read data. I have read the datasheet quite a few times but not able to get how to use SPI. I am basically confused in using SPI.

any help is solicited.

here's the data sheet: http://www.st.com/stonline/products/...e/ds/12094.pdf

here's my program:

INCLUDE "modedefs.bas"
CS VAR PORTB.4
CLK VAR PORTB.3
DI VAR PORTB.2
DO VAR PORTB.2
BUFF VAR WORD
ATM CON $32
MSB CON $AC
LSB CON $F3

START
GOSUB GETDATA
GOTO START

GETDATA
Low CS
Shiftout DI,CLK,MSBFIRST,[ATM,MSB,LSB]
Shiftin DO,CLK,MSBPRE,[BUFF]
High CS
serout PORTA.2,N2400,[BUFF]
RETURN
END

-Thanks

[skimask]

No idea which PIC you're using...therefore no idea if the PIC you are using has any other functions on the PortB pins you are using...

No colons behind START and GETDATA

[dhouston]

There's an SPI example on the meLabs web site.

[devil6600]

No idea which PIC you're using...therefore no idea if the PIC you are using has any other functions on the PortB pins you are using...

No colons behind START and GETDATA

I am using 16f84.

-Thanks

[devil6600]

There's an SPI example on the meLabs web site.

I have already tried it, not able to complie it, lot's of error

-Thanks

[skimask]

I have already tried it, not able to complie it, lot's of error
-Thanks

And did you add the colons?
Or are you using Proton basic?

[mister_e]

colons are not 100% mandatory, it may work without.

i would suggest to have a look a the following
http://www.melabs.com/resources/samples/x1/pbp/spix.bas

If you receive few compilation error, it's probably because that code above is made for a 16F877x. Grandpa 16F84 have no PORTC, PORTD, PORTE & ADCON1 registers.

[devil6600]

hello,

here's the code in c.
Can you help me to port it into picbasic?
I am not sure how to read an address register and write an address register with some data.

void Write_SPI_Data(char address, char data)
{
ClrBit(PBDR, 2); //Chip select active
SPIDR = address;
while(!ValBit(SPISR,7)); //wait the end of tx
SPIDR=data;
while(!ValBit(SPISR,7)); //wait the end of tx
SetBit(PBDR, 2);//Chip select inactive
return;
}
char Read_SPI_Data(char address)
{
ClrBit(PBDR, 2); //Chip select active
SPIDR = address + 0x80; // "write addr" + 0x80 for reading operations
while(!ValBit(SPISR,7)); //wait the end of rx
SPIDR = 0x00; //dummy byte
while(!ValBit(SPISR,7)); //wait the end of rx
SetBit(PBDR, 2); //Chip select inactive
return SPIDR;
}
void Init_MEMS_device(void)
{
//Write_SPI_Data(0x20, 0xC7); // REG1 40Hz
Write_SPI_Data(0x20, 0xD7); // REG1 160Hz
Write_SPI_Data(0x21, 0x05); // REG2, data ready enabled, 16 bits
//Write_SPI_Data(0x21, 0x85); // REG2, data ready enabled, 16 bits. 6g FS
//Write_SPI_Data(0x21, 0x00); // REG2 //no DataRDY, 12 bit right just
Write_SPI_Data(0x22, 0x00); // REG3
Write_SPI_Data(0x38, 0x00); // DD_CFG
return;
}
void acquire(void)
{
ACC[0]=((Read_SPI_Data(0x29))<<8)|Read_SPI_Data(0x28);
ACC[1]=((Read_SPI_Data(0x2B))<<8)|Read_SPI_Data(0x2A);
ACC[2]=((Read_SPI_Data(0x2D))<<8)|Read_SPI_Data(0x2C);
return ;
}

-Thanks

[skimask]

I am not sure how to read an address register and write an address register with some data.

PicBasicPro...da manual...has the information you need to learn how to read an address register and write an address register with some data.