Altera DE1-SoC - Examples for HPS SoC and FPGA Interaction; HPS Controlling FPGA LED and HEX

DE1-SoC User Manual
98
www.terasic.com
March 14, 2014
 I2C Driver
The procedures to read register value from TV Decoder by the existing I2C bus driver in the system
are:
 Set HPS_I2C_CONTROL high for HPS to access I2C bus.
 Open the I2C bus driver "/dev/i2c-0": file = open("/dev/i2c-0", O_RDWR);
 Specify the I2C address 0x20 of ADV7180: ioctl(file, I2C_SLAVE, 0x20);
 Read or write registers;
 Set HPS_I2C_CONTROL low to release the I2C bus.
 Demonstration Source Code
 Build tool: Altera SoC EDS v13.1
 Project directory: \Demonstration\SoC\ hps_i2c_switch
 Binary file: i2c_switch
 Build command: make ('make clean' to remove all temporal files)
 Execute command: ./ i2c_switch
 Demonstration Setup
 Connect a USB cable to the USB-to-UART connector (J4) on the DE1-SoC board and
host PC.
 Copy the executable file " i2c_switch " into the microSD card under the "/home/root"
folder in Linux.
 Insert the booting microSD card into the DE1-SoC board.
 Power on the DE1-SoC board.
 Launch PuTTY to establish connection to the UART port of DE1_SoC borad. Type
"root" to login Yocto Linux.
 Execute "./ i2c_switch " in the UART terminal of PuTTY to start the I2C MUX test.
 The demo program will show the result in the Putty, as shown in Figure 6-10.
Figure 6-10 Terminal output of the I2C MUX Test Demonstration
 Press "CTRL + C" to terminate the program.
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