ATmega32 working with ENC28J60 for embedded web-server

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m_pourfathi

Joined: 07 Feb 2008
Posts: 237
Helped: 22

12 Jul 2008 5:22 enc28j60 avr

Hi all,
I am using an AVR ATmega32 Microcontroller with a MicroChip ENC28J60 Ethernet MAC and PHY layer device for implementing a mini web server. ENC28J60 uses spi interface to communicate with the microchip. Also I am using codevision compiler. I am checking my hardware first to see if AVR can communicate with ENC28J60 properly. But there's been this problem that AVR can't read data from ENC. for checking I am using this syntax:

SPDR = 0x15;
get_data = SPDR;
PORTA = get_data;
// Data read appears on PORTA for checking.

0x15 means read data from address 15 hex. what might be the problem? please help! thanks

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Slayerza

Joined: 22 Oct 2005
Posts: 321
Helped: 22
Location: South Africa

14 Jul 2008 20:56 enc28j60 atmega32

How is address 0x15 defined. If it is a register within the ethernet IC you should send the desired register first and then read from the device. Typically SPI devices does not have an address and makes use of a chip select or enable to activate the device.

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Slayer

m_pourfathi

Joined: 07 Feb 2008
Posts: 237
Helped: 22

15 Jul 2008 5:17 atmega32 enc28j60

The address sent through SPI is for the ethernet IC memory. It has a ROM inside and there are about 40 or maybe 50 registers inside that can change some properties, like when do LEDs blink. I upload the datasheet so you can have a better understanding of the addressing I mentioned before.

thanks

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