Adafruit nRF52 feather not compatible with Arducam (OV2640)

[MarcelRoehrl]

Hey, the OV2640 cam worked fine on our MEGA, but the requirements for our project changed and we've to work with Adafruit nRF52 feathers. I get the following error when trying to upload a test sketch:

C:\Users\xxx\Documents\Arduino\libraries\ArduCAM/ArduCAM.h:695:2: error: 'regtype' does not name a type

regtype *P_CS;

^

C:\Users\xxx\Documents\Arduino\libraries\ArduCAM/ArduCAM.h:696:2: error: 'regsize' does not name a type

regsize B_CS;

^

exit status 1 Error compiling for board Adafruit Bluefruit nRF52 Feather.

I hope I just have to modify the ArduCAM.h file. If so, please give the me neccessary changes. I hope you can help me fast. Many thanks in advance

[UCTRONICS]

@MarcelRoehrl Do you use our new ArduCAM.h file? It seems your .h file doesn't support for adafruit feather board. Please download the file from https://github.com/ArduCAM/Arduino/blob/master/ArduCAM/ArduCAM.h

[MarcelRoehrl]

Hey, thanks for the fast reply. I was using the newest library including this file. I replaced it nevertheless but I get the same error. The file also says that it supports 'Feather M0', nothing about the nRF52.

[UCTRONICS]

@MarcelRoehrl Which board have you chosen? Please attach me some pictures.

[MarcelRoehrl]

Hey, sorry I was on vacation. This is the hardware I'm working with, currently just on a breadboard for testing. Like I said the camera should be fine, because it works on our mega. We'll propably change to the Arducam Mini 5 MP in the future.

[MarcelRoehrl]

Hey, do you have any updates for me?

[UCTRONICS]

@MarcelRoehrl Hi, Sorry for my late reply because of the China National Day and we have a holiday. Please open the Ardu'CAM.h file and add the below code to support the NRF52 board.

if defined(ARDUINO_ARCH_NRF52)

#define cbi(reg, bitmask) digitalWrite(bitmask, LOW)
#define sbi(reg, bitmask) digitalWrite(bitmask, HIGH)
#define pulse_high(reg, bitmask) sbi(reg, bitmask); cbi(reg, bitmask);
#define pulse_low(reg, bitmask) cbi(reg, bitmask); sbi(reg, bitmask);

#define cport(port, data) port &= data
#define sport(port, data) port |= data

#define swap(type, i, j) {type t = i; i = j; j = t;}

#define fontbyte(x) cfont.font[x]  

#define regtype volatile uint32_t
#define regsize uint32_t

endif

You can download the file from https://github.com/ArduCAM/Arduino/blob/master/ArduCAM/ArduCAM.h I have helped you added it.

[MarcelRoehrl]

Thanks, I've done that and could compile and upload it to the board. Now I get a SPI interface error. I was testing the camera with your video streaming example. I tried different nrf52 boards, different CS pins and connected the VCC pin to 3,3V and USB pin (5V). I also checked every cable that is connected to the board. I also connected everything back on a Mega and the camera still works with that board. I hope you can help me, because I can't get past that SPI interface error.

[UCTRONICS]

@MarcelRoehrl Great to hear you have compiled the code and upload it to the board. Don't worry and I will try my best to help you. Please check the schematic diagram of nrf52 boards to ensure the SPI pins and then test the SPI interface individually.

[MarcelRoehrl]

I've checked these and they are connected to the right pins. I also tried a different nrf52 board. I temporarily connected a TFT screen that uses SPI and it works. How should I test the SPI interface individually?

[UCTRONICS]

@MarcelRoehrl You can use those demos:

[MarcelRoehrl]

I don't have have the hardware for these demos. Like I said, I tested the camera on three different nrf52 and the TFT works on every single one (uses SPI, but not SCL and SDA). Here is another test code.

#include <Wire.h>
#include <ArduCAM.h>
#include <SPI.h>
#include "memorysaver.h"

#define CAM_CS 11

int bufSize = 150;
byte buf[150];

ArduCAM myCAM( OV2640, CAM_CS );

void setup()
{
  pinMode(CAM_CS, OUTPUT);

  Serial.begin(115200);
  while (!Serial);

  /*
     CAM Initialisierung
  */
  digitalWrite(CAM_CS, LOW);
  delay(1000);
  uint8_t vid, pid;
  uint8_t temp;
  Wire.begin();
  SPI.begin();
  //Reset the CPLD
  myCAM.write_reg(0x07, 0x80);
  delay(100);
  myCAM.write_reg(0x07, 0x00);
  delay(100);
  Serial.println("Arducam initialized");

  while (1)
  {
    //Check if the ArduCAM SPI bus is OK
    myCAM.write_reg(ARDUCHIP_TEST1, 0x55);
    temp = myCAM.read_reg(ARDUCHIP_TEST1);

    if (temp != 0x55) {
      Serial.println("SPI interface Error!");<--------------------------------------------------------I'm getting this error 
      delay(1000); continue;
    } else {
      Serial.println("SPI interface OK"); break;
    }
  }

  while (1)
  {
    //Check if the camera module type is OV2640
    myCAM.wrSensorReg8_8(0xff, 0x01);
    myCAM.rdSensorReg8_8(OV2640_CHIPID_HIGH, &vid);
    myCAM.rdSensorReg8_8(OV2640_CHIPID_LOW, &pid);
    if ((vid != 0x26 ) && (( pid != 0x41 ) || ( pid != 0x42 ))) {
      Serial.println("Can't find OV2640 module!");
      delay(1000); continue;
    }
    else {
      Serial.println("OV2640 detected"); break;
    }
  }

  myCAM.set_format(JPEG);
  myCAM.InitCAM();
  myCAM.OV2640_set_JPEG_size(OV2640_1600x1200);
  digitalWrite(CAM_CS, HIGH);
}

I marked where it stops working. I always get the 'SPI interface Error!'.

[MarcelRoehrl]

Hey, I still didn't get it to work. I've three of these Arducams now, but I get this error everytime. I think it's because of the SDA and SCL port. I'll look into that. Do you have any idea how to fix this?

[MarcelRoehrl]

I also tried two 4,7 k ohmspullup resistors between the SDA and SCL pins. Also didn't work.

[UCTRONICS]

@MarcelRoehrl Sorry for my late reply. Have you tested the I2c interface separately? You can use this i2c demo to test the i2c firstly. // Wire Master Writer // by Nicholas Zambetti http://www.zambetti.com

// Demonstrates use of the Wire library // Writes data to an I2C/TWI slave device // Refer to the "Wire Slave Receiver" example for use with this

// Created 29 March 2006

// This example code is in the public domain.

include

void setup() { Wire.begin(); // join i2c bus (address optional for master) }

byte x = 0;

void loop() { Wire.beginTransmission(4); // transmit to device #4 Wire.write("x is "); // sends five bytes Wire.write(x); // sends one byte
Wire.endTransmission(); // stop transmitting

x++; delay(500); }

[MarcelRoehrl]

Hey, thanks. I tested the code. The writing seems to be working. I added some lines to also print the current byte value on the serial monitor. I just tested the cam on an Arduino micro and I get the same SPI interface error there.

[MarcelRoehrl]

I connected another feather board via SDA and SCL and wrote a receiving part for the code. Now it stops sending after one try. I'll look into that.

#include <Wire.h>

void setup() {
  Serial.begin(115200);
  while (!Serial);

  Wire.begin(); // join i2c bus (address optional for master)
  Wire.onReceive(receiveEvent);
  Wire.begin(4);
}

void loop() {
}

void receiveEvent(int howMany){
  Serial.println(Wire.read());
}

[Splitframe]

Hi,

I have the same problem. It doesn't seem to be the I2C Bus though. The feather crashes as soon as the Arducam library is loaded. I can't even write to serial out of it.

Edit: Now it doesn't crash anymore ( I can't use delay() for some reason). But I noticed that it doesn't sent anything through I2C. When I use the Wire lib by myself I can see how it pulls down on the spectrograph, but with the ArduCAM library nothing happens.

[Splitframe]

I use an ArduCAM Mini 2MP and an Adafruit Feather NRF52832 with an Cortex M4F. This Display: https://www.elektor.de/2-2-spi-tft-display-module-240x320 works without Problems.

This test code with just the inital SPI test already does not work:

#include <Wire.h>
#include <SPI.h>
#include <bluefruit.h>

uint8_t temp = 0;

void setup()
{
  delay(100);

  pinMode(11, OUTPUT);
  digitalWrite(11, LOW);
  Serial.begin(9600);
  while (!Serial);
  Serial.println("Init");

  Serial.println("Starting Wire");
  Wire.begin();
  Serial.println("Starting SPI");
  SPI.begin();
  //SPI.beginTransaction(SPISettings(8000000, MSBFIRST, SPI_MODE0));
  //SPI.beginTransaction(SPISettings(4000000, MSBFIRST, SPI_MODE0));

  Serial.println("Writing to CAM");

  SPI.transfer(0x07 | 0x80);
  SPI.transfer(0x80);
  delay(100);

  SPI.transfer(0x07 | 0x80);
  SPI.transfer(0x00);
  delay(100);

  //SPI.endTransaction();
}

void loop() {

  //SPI.beginTransaction(SPISettings(8000000, MSBFIRST, SPI_MODE0));
  //SPI.beginTransaction(SPISettings(4000000, MSBFIRST, SPI_MODE0));
  SPI.transfer(0x00 | 0x80);
  SPI.transfer(0x55);

  delay(100);

  SPI.transfer(0x00);
  temp = SPI.transfer(0x00);

  if (temp != 0x55) {
    Serial.println("SPI interface Error!");
    delay(1000); 
  } else {
    Serial.println("SPI interface OK");
  }
  //SPI.endTransaction();
}

Edit: Changed to Arduino BSD

[angeac]

@MarcelRoehrl did you fix the issue? I'm having the same with that error "SPI Interface Error", I think it's something with the wiring but I'm not sure, I already uploaded the code to the feather but I always get the same error