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I connected the SPI to a SPI bus analyser in the osculloscope, and here are the results,

Knowing that;
D0 : DO
D1 : SCK
D2 : CS

soft spi during mfrc522 communication
https://drive.google.co ...

thank you temtronic for clarification,
forgive my igonorance,

I use the scope as you said, and here is the results
soft SPI
[img]https://drive.google.com/file/d/0By2rhMw0TAvNRWM0YmhkV1lKWDA/vie ...

Maybe this

spi_write(reg & 0x7E);
output_bit(PIN_CS, 1);
spi_write(value);

Regards,
Atarek

PCM Programmer,

Thank you for your effort to make sure that i understand the concept,

according to what you said the correct answer is to make NSS logic high between the 2 byte transmission,

...

HI PCM Programmer,

Thank you for the explanation,
but in the last section you mentioned the following

In the code below, you are manually handling chip select, and you are
keeping it low for ...

Hi Temtronic,

Thank you for the quick feedback,

the list file of the software SPI
.................... SoftSPI_write(reg & 0x7E);
0052: MOVF 65,W
0054: ANDLW 7E
0056: MOVWF 67 ...

here it is

void MFRC522_init(void) //MFRC522 chip initialization
{
MFRC522_writeReg(TModeReg, 0x8D);
MFRC522_writeReg(TPrescalerReg, 0x3E);
MFRC52 ...

Thank you Ttelmah for your quick feedback,
but it seems that i have another problem. When i try to use the hardware SPI, the micro controller does not exit any routine that uses hardware SPI.

So t ...

Hi everyone,

I need advice in something,
I am trying to interface MFRC522 using hardware SPI. However, I fail every time. I thought to share the code, and maybe someone can help me.

The descrip ...