PN532 Adafruit on Edison with i2c - Didn't find PN53x board

idata · ‎08-17-2016

Hi,

I tried to connect edison to NFC reader (PN532 Adafruit). As I read in pdf documentation of INTEL the right way is to use I2C.

Sketch: Arduino

Connection here

Here the code (the Adafriut example):

# include

# define IRQ (2)

# define RESET (3) // Not connected by default on the NFC Shield

Adafruit_NFCShield_I2C nfc(IRQ, RESET);

void setup(void) {

Serial.begin(115200);

Serial.println("Hello!");

nfc.begin();

uint32_t versiondata = nfc.getFirmwareVersion();

if (! versiondata) {

Serial.print("Didn't find PN53x board");

while (1); // halt

}

// Got ok data, print it out!

Serial.print("Found chip PN5"); Serial.println((versiondata>>24) & 0xFF, HEX);

Serial.print("Firmware ver. "); Serial.print((versiondata>>16) & 0xFF, DEC);

Serial.print('.'); Serial.println((versiondata>>8) & 0xFF, DEC);

// Set the max number of retry attempts to read from a card

// This prevents us from waiting forever for a card, which is

// the default behaviour of the PN532.

nfc.setPassiveActivationRetries(0xFF);

// configure board to read RFID tags

nfc.SAMConfig();

Serial.println("Waiting for an ISO14443A card");

}

void loop(void) {

boolean success;

uint8_t uid[] = { 0, 0, 0, 0, 0, 0, 0 }; // Buffer to store the returned UID

uint8_t uidLength; // Length of the UID (4 or 7 bytes depending on ISO14443A card type)

// Wait for an ISO14443A type cards (Mifare, etc.). When one is found

// 'uid' will be populated with the UID, and uidLength will indicate

// if the uid is 4 bytes (Mifare Classic) or 7 bytes (Mifare Ultralight)

success = nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A, &uid[0], &uidLength);

if (success) {

Serial.println("Found a card!");

Serial.print("UID Length: ");Serial.print(uidLength, DEC);Serial.println(" bytes");

Serial.print("UID Value: ");

for (uint8_t i=0; i < uidLength; i++)

{

Serial.print(" 0x");Serial.print(uid[i], HEX);

}

Serial.println("");

// Wait 1 second before continuing

delay(1000);

}

else

{

// PN532 probably timed out waiting for a card

Serial.println("Timed out waiting for a card");

}

On serial Monitor:

Didn't find PN53x board

Is there something wrong? Or jumper to active on Edison shield?

Thanks.

Paolo

idata · ‎08-17-2016

Hello Busnet.it,

Could you please try the following tests?

1. With your current setup, access your Edison's Linux terminal and run the following script:

# !/bin/sh

echo 28 > /sys/class/gpio/export

echo 27 > /sys/class/gpio/export

echo 204 > /sys/class/gpio/export

echo 205 > /sys/class/gpio/export

echo 236 > /sys/class/gpio/export

echo 237 > /sys/class/gpio/export

echo 14 > /sys/class/gpio/export

echo 165 > /sys/class/gpio/export

echo 212 > /sys/class/gpio/export

echo 213 > /sys/class/gpio/export

echo 214 > /sys/class/gpio/export

echo low > /sys/class/gpio/gpio214/direction

echo high > /sys/class/gpio/gpio204/direction

echo high > /sys/class/gpio/gpio205/direction

echo in > /sys/class/gpio/gpio14/direction

echo in > /sys/class/gpio/gpio165/direction

echo low > /sys/class/gpio/gpio236/direction

echo low > /sys/class/gpio/gpio237/direction

echo in > /sys/class/gpio/gpio212/direction

echo in > /sys/class/gpio/gpio213/direction

echo mode1 > /sys/kernel/debug/gpio_debug/gpio28/current_pinmux

echo mode1 > /sys/kernel/debug/gpio_debug/gpio27/current_pinmux

echo high > /sys/class/gpio/gpio214/direction

After you have ran it, run the command i2cdetect -y -r 6, does your board detect the I2C device?

2. Using pretty much the same setup but with a external power supply for Edison. Run the script above and the i2cdetect command again. Is there any difference?

3. Using a different power supply only for your I2C device. Run the script above and the i2cdetect command again. Is there any difference? Remember connect both boards grounds.

Let me know if you are able to see any difference between the results of those tests.

-Peter.

idata · ‎08-18-2016

Hi Peter,

I'm sorry but It does not work.

The script

i2cdetect

Step 1. after script and command

FAIL

Step 2. with a external power supply for Edison

FAIL

Step 3. different power supply only for your I2C device

FAIL

I run the script after upload the code before the command nfc.begin();

Paolo

idata · ‎08-18-2016

Hi Paolo,

These tests let us determine that the issue is not related to a lack of power to your I2C device. We would like to ask you if you have access to another I2C device and if so, could you please test if your Edison can detect it with the i2cdetect command. Also, in case you have access to another board (like an Arduino UNO), could you please check if your I2C device issues persist with it?

-Peter.

idata · ‎08-18-2016

Hi Peter,

Same i2c device with Arduino works correctly, but tomorrow I Will try to use another device.

Thanks

Paolo

idata · ‎08-19-2016

Hi Peter,

I done a lot of test; finally the problem is solved.

Thanks to your advice, I tried to give power to the i2c device after the boot of Edison (I thought about a power problem). So the device was recognized: first upload the code, when transfer complete I inserted 5V pin.

But card reader did not work well.

So I tried to use 3,3V and It works perfectly. My be there is something wrong..

Paolo

Thank-you, see you on maker faire ROME.

idata · ‎08-19-2016

Hi Paolo,

I'm glad to hear that it is now working. If you ever have any other doubts, please don't hesitate to come back to the community, we'll try to help you in any way we can.

-Peter.