SPI Interface

[crbreingan]

Hello,

I need to get my Roboard to read data from the SPI interface. I have code already that runs SPI using the standard linux interface. My question is, does the Roboard's SPI use the standard linux interface or do I have to use the libraries that they provide on their website?

Thanks.

[roboard]

Hi,

the standard linux SPI interface isn't provided; we recommend that use RoBoIO library to operate RoBoard's SPI interface.

[crbreingan]

I see. So I'll use the RoBoIO library. However, I need two SPI slaves and there appears to be only one SPI SS pin. I understand that I could use the PWM pins as GPIO. But are there any GPIO pins on the SPI/I2C port? There are two pins labeled GP34 and GP35. Can these be used as SS pins? And if so, how?
Thanks.

[roboard]

Hi

In fact, the SPI SS pin on SPI/I2C port is that use GPIO to simulate SPI SS (refer to spi_EnableSS and spi_DisableSS functions in spi lib). The GP34 and GP35 are dedicated to H/W I2C function and are not recommended to be treated as GPIO. We suggest that use GPIO pins (S1 ~ S24) to simulate SPI SS by using rcservo_Outp function in rcservo lib if you need more SPI SS pins.