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peterzatko
Joined: 20 Jun 2014
Posts: 14
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| i2c and 16f819 help |
 Posted: Mon Jul 28, 2014 9:40 am |
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I need help with communication Pic 16f819 and rfid - sl030
Here is link for rfid SL030
http://www.sos.sk/a_info/resource/c/Stronglink/SL030.pdf
I don't see clock on scl and data on sda with scope.
I use pull up resistors on scl and sda to vcc.
In my code i want read UID of the Mifare card.
I don't know what's wrong.
I use internal oscillator.
Please help me.
| Code: |
#include <rfid.h>
unsigned int8 pocetcitani;
void main()
{
loop:
{
i2c_start();
i2c_write(0xa0); // Device address sl030 for write
i2c_write(0x01); // LEN leght
i2c_write(0x01); // number of command
i2c_stop();
}
delay_ms(100);
{
i2c_start();
i2c_write(0xa1); // Device address sl030 for read
pocetcitani=i2c_read(0); // read LEN
int i = 0;
unsigned int8 data[32];
For (i=0;i<pocetcitani;i++ )
{
data[i] = i2c_read();
}
i2c_stop();
}
} |
Here are my fuses....:
| Code: |
#include <16F819.h>
#device ADC=16
#FUSES NOWDT //No Watch Dog Timer
#FUSES NOBROWNOUT //No brownout reset
#FUSES NOLVP //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#device ICD=TRUE
#use delay(internal=8000000)
#use FIXED_IO( A_outputs=PIN_A7,PIN_A6,PIN_A5,PIN_A4,PIN_A3,PIN_A2,PIN_A1,PIN_A0 )
#use FIXED_IO( B_outputs=PIN_B7,PIN_B6,PIN_B5,PIN_B3,PIN_B2,PIN_B0 )
#use i2c(Master,Fast,sda=PIN_B1,scl=PIN_B4) |
Last edited by peterzatko on Mon Jul 28, 2014 10:00 am; edited 1 time in total |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19504
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| Posted: Mon Jul 28, 2014 9:48 am |
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Er. You say 'I use internal oscillator'.
However your code says 'use an external crystal'.
Look in the manual at the meaning of the keyword 'crystal', and the keyword 'internal', in the clock line.....
There are other problems (look at when you should NACK a read. Is this when you are doing it?).
However do the key thing. Start with a flash an LED test, and get the fuses/clock right, so the PIC is running. |
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