Problem init WizFi250

Question

I’m trying to use an WizFi250-H with an Arduino Mega 2560 through the SPI interface. I’m using logic level converters on all signals between the WizFi250-H and the Mega2560. For the circuit I followed the reference schematic: UART1_RXD and URT1_TXD pulled up to 3.3v through 10K resistors, BOOT pin floating, and FUNCTION pin pulled up to 3.3V. I checked with a scope the level of the SPI signals at the WizFi250 pins. SCK, CS, MOSI have pulses, but MISO is always at 0 . When I try to use any of the example sketches included in the official WizFi Arduino library, the code stops during the wifi.init() e don’t go further. I bought a second WizFi250-h module, and the behaviour is the same. Surely I’m doing something wrong, but what? Can you help me? Does the WizFi250-H require the use of the UART1_RXD and UART_TXD signals, or can I just use SPI? Thanks in advance

irina · Answer

Hi, I apologize for late reply. It is possible to communicate with SPI between WizFi250 and Mega2560. You should set SPI mode before SPI communication. I think it is helpful. plz check below link. http://wizwiki.net/wiki/doku.php?id=products:wizfi250:wizfi250pg:start#at_mspi Best Regards, Tom

Werk AG · Answer

Hi Tom, tanks for your reply. This is from the document referred in your answer (which I already had read) "AT Command Set This section provides a list of WizFi250 AT commands and their effects. Users can input commands and parameters through USART line As I tried to say, I designed my board without any connection to the USART lines of the WizFi250 module. In my project I’m already using all the 4 uarts of the Mega, this was the main reason why I choose an SPI WiFi module. So, how I can send AT command’s to make it work in SPI mode? Is it a requirement having the USART lines connected from the MCU to the WizFi module to make it work in SPI? After having the module powered, should I see any WiFi network? Answers to my questions will be greatly appreciated. This project is on hold until I solve this question. Once again, thank you.

irina · Answer

Hi, Werk I am aplogize sincerely… I have no excuse for late answer. I hope you it is helpful. WizFi250 supports SPI interface and of course SPI line ! H/W connection should be like below. Arduino (SPI Master) ---- WizFi250 (SPI Slave) ------- Remarks------------------ Allocate your GPIO ------- GPIO14 (50) --------------- WizFi250 Data Ready MSPI_MISO ----------------- SPI_MISO (21) ------------- SPI Master In/Slave Out MSPI_CLK ------------------- SPI_SCK (22) ------------- SPI Clock MSPI_CS ---------------------- SPI_SS (24) --------------- SPI Chip Select MSPI_MOSI ----------------- SPI_MOSI (23) ------------- SPI Master Out/Slave In GND ----------------------------- GND ------------------- Command Ground And, we provide a SPI interface s/w examples based on arduino. github.com/Wiznet/Arduino_WizFi2504 I hope you it will be helpful to solve your qeustions. If you have other problems, ask anytime !!! Thanks,