SPI1 on W5500_EVB

TCP/IP Chip W5500
1

Hi,
I want to enable the SPI1 of the LPC micro on the evaluation board to connect to FPGA on another board.
While readng the init code for w5500 I noticed that the reset is done thru PIO0_22:

Chip_GPIO_SetPinState(LPC_GPIO, 0, 22, false);	// N_RESET
tmp = 0xFF;
while(tmp--);
Chip_GPIO_SetPinState(LPC_GPIO, 0, 22, true);	// N_RESET

On the other hand in the schematics (V1.0) the w5500 RST_N connected to LPC micro PIO0_3 pin?!

The problem also is that PIO0_ 22 is the only pin where I can select the MISO1 for the SPI1 interface.

Another issue I saw is that the SSEL0 signal for the SPI0 select is not done via he SSEL dedicated function but rather via a GPIO function of the same pin (PIO0_2/SSEL0):

Chip_IOCON_PinMuxSet(LPC_IOCON, 0, 2, (IOCON_FUNC0 | IOCON_MODE_PULLUP));
Chip_GPIO_SetPinDIROutput(LPC_GPIO, 0,  2);	// SSEL(CS) as GPIO output

Why it is done this way? Should I follow the same method when workng with SPI1 or is it somehow related to wiznet SPI interface.

2

hello,

I want to know where you got the code you say.
Tell me the path to the code
thank you

1 Like
3

i got from GitHub
Wiznet/W5500_EVB/blob/master/wiznet_evb_w5500evb_board/src/w5500_spi.c

I do understand why the SSEL is not given to the SSP machine to handle but rather controled manualy by GPIO since it is hard to customize the size of the SPI frame otherwise .
The N_RESET issue is not correct as far as I understand

4

Hello,
As you say, the reset should be done thru PIO0_3.
There was a our mistake.
Sorry