ADXL345 Bad Response? - Raspberry Pi Forums

hardware connection

rbpi2 adxl345.jpg (57.82 kib) viewed 986 times

hi, i'm using pi2 try , gather accelerometer data analog devices adxl345.
i'm using propriety board made analog devices not chinese one.
it's connected pi per rbpi2 adxl345.jpg attached.
i'm running this

code: select all

#include <bcm2835.h> #include <stdio.h>  int main(int argc, char **argv) {          if (!bcm2835_init())         return 1;          bcm2835_spi_begin();     bcm2835_spi_setbitorder(bcm2835_spi_bit_order_msbfirst);      // default     bcm2835_spi_setdatamode(bcm2835_spi_mode0);                   // default     bcm2835_spi_setclockdivider(bcm2835_spi_clock_divider_65536); // default     bcm2835_spi_chipselect(bcm2835_spi_cs0);                      // default     bcm2835_spi_setchipselectpolarity(bcm2835_spi_cs0, low);      // default          char buf[] = { 0x80, 0x00, 0x00, 0x00}; // read deviceid of adxl345     bcm2835_spi_transfern(buf, sizeof(buf));     // buf filled data read slave     printf("device id: %02x %02x %02x %02x \n", buf[0], buf[1], buf[2], buf[3]);  //    delay(1000);      char buf2[] = { 0x2d, 0x02, 0x00}; // setup 0x2d ( power_ctl reg ) measure     bcm2835_spi_transfern(buf2, sizeof(buf2)); // (b7 reset == write)     printf("setup response is: %02x %02x %02x %02x \n", buf2[3], buf2[2], buf2[1]);      delay(1000);      char buf3[] = { 0xb2, 0x00, 0x00}; // read x0 reg 0x32 (b7 set == read)     bcm2835_spi_transfern(buf3, sizeof(buf3));     printf("x axis is: %02x %02x %02x \n", buf3[3], buf3[2], buf3[1]);  //    delay(1000);      bcm2835_spi_end();     return 0; }

response is

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~/projects/adxl $ sudo ./spix device id: 00 00 00 00 setup response is: f2 f2 f2 f2 x axia is: 00 00 00

made read device id 4 byte buffer assuming missing something.
same idea setup response.
2 attached oscillograms confirm responses get.... edit: cannot attach 64kb max makes them small view.

these f2 responses error code?

any appreciated here.

have faulty unit or code bad somewhere?

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