Altera DE1-SoC - Page 96

DE1-SoC User Manual
95
www.terasic.com
March 14, 2014
write(file, &Data8, sizeof(unsigned char));
The step 4 above can also be changed to the following to read multiple byte values.
read(file, &szData8, sizeof(szData8)); // where szData is an array of bytes
The step 4 above can be changed to the following to write multiple byte values.
write(file, &szData8, sizeof(szData8)); // where szData is an array of bytes
 G-sensor Control
The ADI ADXL345 provides I2C and SPI interfaces. I2C interface is selected by setting the CS pin
to high on the DE1_SoC board.
The ADI ADXL345 G-sensor provides user-selectable resolution up to 13-bit ± 16g. The
resolution can be configured through the DATA_FORAMT(0x31) register. The data format in this
demonstration is configured as:
 Full resolution mode
 ± 16g range mode
 Left-justified mode
The X/Y/Z data value can be derived from the DATAX0(0x32), DATAX1(0x33), DATAY0(0x34),
DATAY1(0x35), DATAZ0(0x36), and DATAX1(0x37) registers. The DATAX0 represents the least
significant byte and the DATAX1 represents the most significant byte. It is recommended to
perform multiple-byte read of all registers to prevent change in data between sequential registers
read. The following statement reads 6 bytes of X, Y, or Z value.
read(file, szData8, sizeof(szData8)); // where szData is an array of six-bytes
 Demonstration Source Code
 Build tool: Altera SoC EDS v13.1
 Project directory: \Demonstration\SoC\hps_gsensor
 Binary file: gsensor
 Build command: make ('make clean' to remove all temporal files)
 Execute command: ./gsensor [loop count]
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