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Using MFRC522 RFID Reader with PIC16F877
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PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Sat Jul 27, 2019 12:52 pm

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bharath0209 wrote:

// Note:Connect MFRC522 module to 5v PIC without any Level converter.
// It'll work fine.

I had to increase the supply voltage to 3.7 volts for it to work perfectly.

This strongly indicates a level-shifter issue. You are probably missing the
level shifter circuits. Look at the schematic for your MFRC522 product.
Does it have built-in level shifter circuits ?

myloudharim

Joined: 13 Nov 2017
Posts: 10
Location: philly

Posted: Thu Mar 18, 2021 10:55 pm

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Did you correct spi write function?

Code:

void spi_write(byte value )
{
SSPBUF = dat;

}

Should be

Code:

void spi_write(byte value )
{
SSPBUF = value;

}

PCM programmer

Joined: 06 Sep 2003
Posts: 21708


Posted: Sat Mar 20, 2021 11:47 am

That function is commented out in his code, and is not used. It doesn't matter.

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