WiFi on Cobra III with GXP Bridge using SU Socket

[srogers]

I recently received a GXP Gadgeteer Bridge for my Cobra III. I want to connect a Gadgeteer RS9110 wireless WiFi module with antenna. I note that the GXP Bridge provides an SU socket, which the RS9110 WiFi module requires.

I’ve done a detailed examination of the Cobra III, G120 SoM, and GXP schematics. I see that the GXP SU socket provides SPI signals from SPI2 on the Cobra III.

I also saw the following statement in the G120 SoM manual:

Important note: SPI2 is shared internally with the flash memory G120 uses. Using a chip select is required with devices connected using SPI2. Improper use of SPI2 will cause G120 to not boot or not work properly. The use of SPI1 is recommended.

Sorry, but the use of SPI1 appears out of the question with the GXP Gadgeteer Bridge socket SU on the Cobra III board.

I note that the WiFi board I have requires a chip select signal at X5-6 (SU). My schematic indicates the signal at X5-6 is the CAN.TD signal, or on my Cobra III, specifically the CAN2.TD signal, a.k.a. P0.5, a.k.a. D51.

I also note that the WiFi board requires an interrupt line (INT) at X5-3 (SU). My schematic indicates the signal at X5-3 is the CAN.RD signal, or on my Cobra III, specifically the CAN2.RD signal line, a.k.a. P0.4, a.k.a. D50.

I also note that the WiFi board requires a reset line (RESET) at X5-4 (SU). My schematic indicates the signal at X5-4 (SU) is the COM.TX signal, or on my Cobra III, specifically the COM4.TX signal, a.k.a. P4.28, a.k.a. D59.

I assume that the correct initialization for a WiFi board on a Cobra III using the SU connector on the GXP adapter is as follows:

wifi = new WiFiRS9110(
     FEZCobraIII.SpiBus.Spi2,  // SPI module 
     FEZCobraIII.Gpio.D51,     // chip select
     FEZCobraIII.Gpio.D50,     // external interrupt
     FEZCobraIII.Gpio.D59);    // reset

Does this look correct?

[John_Brochue]

@ srogers - Those are the correct pins.