Epcs4 interface problem

Hi,

Yeah after I send the WREN, I have done what you have told.

do{

pull CS low

send 0x05

read from eeprom

pull CS high

while(!(read & 0x02))

So I send it many times until i receive 0x02. But I am receiving 0 from the eeprom.

Thanks!

> - pull CS low

> - send WREN(0x06)

> - pull CS high

> - delay();

propose to insert the following lines, to check that the Flash "wants" to talk with you :-)

- pull CS low

- send RDSR (0x05)

- read 1 byte --> shout be 0x02 (=Write Enable Latch is set)

- pull CS high

Regards,

Heiko

Hi,

Yeah the hold pin is high connected to 3.3V. I think my SPI protocol is correct since it worked fine with SD card.

I have done the following steps:

- pull CS low

- send WREN(0x06)

- pull CS high

- delay();

- pull CS low

-send WRITE(0x02)

- send address 1st byte (MSB)

- send address 2nd byte

- send address 3rd byte (LSB)

- send data

- pull CS high

- delay();

Even for read its done in a similar way but using read opcodes.

Thanks!

Hi,

is the hold pin high (pin 7)? You may try to read identifier (command 20h). If you are not sure about the SPI protocol, you may have a look at the data sheet of another Flash e.g. M25P32.

Regards