Hardware

Hardware

Hardware Requierments

Any 96Boards CE Board
Shiratech FPGA Mezzanine
I2C Shield or Sensor
- For the Purpose of this guide I will be using:
  - Relay Shield for Arduino

HArdware Setup

Connect the Shiratech Mezzanine to the 96Boards CE Development Board
Connect the Relay shield on the FPGA Mezzanine’s Arduino Header

Software setup

Install MRAA on 96Boards CE
Download FPGA Mezzanine Library
Paste the following code into a file named relay.c ```C /* // Title: relay.c // Author: Sahaj Sarup // Copyright (c) 2019 Linaro Limited */

#include #include

/* mraa header */ #include “mraa/i2c.h” #include “fpga_mezz.h”

int main() { /Initialise MRAA I2C/ mraa_result_t status = MRAA_SUCCESS; mraa_i2c_context i2c; mraa_init();

i2c = mraa_i2c_init(I2C_BUS);

/*Use I2C Bus0 for FPGA Mezzzanine*/
int input, ver;

if (i2c == NULL) {
    fprintf(stderr, "Failed to initialize I2C\n");
    mraa_deinit();
    return EXIT_FAILURE;
}

/* set slave address */
status = mraa_i2c_address(i2c, FPGA_MEZZI_ADDR);
if (status != MRAA_SUCCESS) {
}

/* Simple Test function to test the I2C Communication */
if(test(i2c)==0)
{
    printf("Test Passed\n");
}
else
{
  printf("Test Failed\n");
  return 1;
}

/* Check Firmware Revision of the FPGA Mezzanine */
ver = check_version(i2c);
if(ver == -1)
{
  printf("Version Check Error\n");
  return 1;
}
else
{
  printf("Version %d\n",&ver);
}

/* Set Pins 7,6,5 and 4 as output */
pinMode(7,OUTPUT,i2c);
pinMode(6,OUTPUT,i2c);
pinMode(5,OUTPUT,i2c);
pinMode(4,OUTPUT,i2c);


while(1)
{
    /* Sequentially toggle each relay on and off. */
    digitalWrite(7,LOW,i2c);
    sleep(1);
    digitalWrite(7,HIGH,i2c);
    sleep(1);
    digitalWrite(6,LOW,i2c);
    sleep(1);
    digitalWrite(6,HIGH,i2c);
    sleep(1);
    digitalWrite(5,LOW,i2c);
    sleep(1);
    digitalWrite(5,HIGH,i2c);
    sleep(1);
    digitalWrite(4,LOW,i2c);
    sleep(1);
    digitalWrite(4,HIGH,i2c);
    sleep(1);
} }

```

Compile using: gcc relay.c <path-to-fpga_mezz_lib>/src/fpga_mezz.c -o relay -I<path-to-fpga_mezz_lib>/include/
Run using: sudo ./relay
- All four relays should turn on and off, one at a time.