Using Two SPI devices

[genemars]

Hi @ebezine ,

I'm experiencing conflicts using two spi devices (share violation on gpio...).
The first one is an MCP3008, while the second one is a Nokia3310 lcd display.

I managed to run both with a mutual access lock but when the program is reading MCP3008 values on the 3310 display do appear some dirty pixels.

So I thought it must been the SelectSlave that must be invoked before reading/writing from the spi, but there's no such method in the Mcp3008SpiConnection class.

Both spi devices are using same pins exception made for the CE0/CE1.

Cheers,
g.

[genemars]

Hi, solved the "interference" issue by mutually closing and reopening SpiConnection each time on both programs. I don't understand if this is a design rule of the SPI, or if there is actually a way of operating with both spi channels at the same time.
Am I missing something?

[ebezine]

Hi @genielabs,

Mcp3008SpiConnection relies on SpiConnection whose design does not support multiple devices.

I'm investigating how to provide a consistent way to describe the various kind of devices (bus controllers, connectors, I/O expanders, converters, switches, sensors, etc.) : that would help to connect devices between each other.

Having this scope in mind I notice this model should be able to connect multiple devices on a SPI bus !

[ebezine]

That's a good workaround for now !