Altera DE1-SoC - Page 95

DE1-SoC User Manual
94
www.terasic.com
March 14, 2014
Figure 6-6 shows the function block diagram of this demonstration. The G-sensor on the DE1_SoC
board is connected to the I2C0 controller in HPS. The G-Sensor I2C 7-bit device address is 0x53.
The system I2C bus driver is used to access the register files in the G-sensor. The G-sensor interrupt
signal is connected to the PIO controller. This demonstration uses polling method to read the
register data.
Figure 6-6 Block diagram of the G-sensor demonstration
 I2C Driver
The procedures to read a register value from G-sensor register files by the existing I2C bus driver in
the system are:
1. Open I2C bus driver "/dev/i2c-0": file = open("/dev/i2c-0", O_RDWR);
2. Specify G-sensor's I2C address 0x53: ioctl(file, I2C_SLAVE, 0x53);
3. Specify desired register index in g-sensor: write(file, &Addr8, sizeof(unsigned char));
4. Read one-byte register value: read(file, &Data8, sizeof(unsigned char));
The G-sensor I2C bus is connected to the I2C0 controller, as shown in the Figure 6-7. The driver
name given is '/dev/i2c-0'.
Figure 6-7 Connection of HPS I2C signals
The step 4 above can be changed to the following to write a value into a register.
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