ArduChip Registers

ArduChip is the core of the ArduCAM, which incoperates a Altera MAXII CPLD EPM240 as main processor. The main task of the ArduChip is do the real time DMA transfer between Camera module and the 3.2″ LCD and act as Arduino, Camera and LCD bus multiplexer. It also provides AVR like GPIO expansion, it can be set as input or output and resolve the problem of limited IO resources in Arduino board. The GPIOs can be used as event trigger in and trigger out. 

Examples:

ArduCAM GPIO Write demo

// ArduCAM GPIO Write demo (C)2012 Lee
// web: http://www.ArduCAM.com
// This program is a demo of how to use GPIOs in ArduCAM to turn on/off
// LEDs or trigger any ohter devices.
//
// This program requires the ArduCAM library.
//
#include <Wire.h>
#include <ArduCAM.h>
#include <avr/pgmspace.h>
#include <SoftwareSerial.h>

#define ARDUCHIP_DDR       0x00  //GPIO direction register
#define ARDUCHIP_PORT      0x01  //GPIO output register
#define ARDUCHIP_PIN       0x80  //GPIO input register
//ArduCAM(byte model,int RS, int WR, int RD, int CS)
ArduCAM myCAM(OV7670,A2,A1,A0,A3);
//Uncomment if use software serial
SoftwareSerial mySerial(8, 9); // RX, TX
void setup()
{
  mySerial.begin(9600);
  mySerial.println("hello");
  myCAM.write_reg( ARDUCHIP_DDR, 0xff);     //Set GPIO as output

}

void loop()
{
  uint8_t val = 0xff;
  uint8_t read_val;
  while(1)
  {
    delay(1000);
    myCAM.write_reg( ARDUCHIP_PORT, val);       //Output Register
    val = val ^ 0xff;                           //toggle output value
    read_val = myCAM.read_reg(ARDUCHIP_PORT);   //Read it back
    mySerial.write(read_val);
  }
  return;

}

ArduCAM GPIO Read demo

// ArduCAM GPIO Read demo (C)2012 Lee
// web: http://www.ArduCAM.com
// This program is a demo of how to use GPIOs in ArduCAM to read 
// trigger signals from any ohter devices.
//
// This program requires the ArduCAM library.
//
#include <Wire.h>
#include <ArduCAM.h>
#include <avr/pgmspace.h>
#include <SoftwareSerial.h>

#define ARDUCHIP_DDR       0x00  //GPIO direction register
#define ARDUCHIP_PORT      0x01  //GPIO output register
#define ARDUCHIP_PIN       0x80  //GPIO input register

//ArduCAM(byte model,int RS, int WR, int RD, int CS)
ArduCAM myCAM(OV7670,A2,A1,A0,A3);
//Uncomment if use software serial
SoftwareSerial mySerial(8, 9); // RX, TX
void setup()
{
  mySerial.begin(9600);
  mySerial.println("hello");
  myCAM.write_reg( ARDUCHIP_DDR, 0x00);     //Set GPIO as input
}

void loop()
{
  uint8_t temp;
  while(1)
  {
    temp = myCAM.read_reg(ARDUCHIP_PIN);      //Read from GPIO
    mySerial.write(temp);                  //Send value read from GPIO
    delay(1000);
  }
  return;

}