Master and Slave SPI interfaces on one PIC?

[starfire151]

I've checked the code listings but haven't seen anything related to this topic other than I2C interfaces.

Has anyone used a "lower" level PIC (18LFxxx family) with simulataneous Master and Slave SPI ports? I have used the built-in hardware port for connection to an SD card interface successfully but I need to act as an SPI Slave for an upstream device and an SPI Master to some downstream devices.

I know the newer PIC32 devices have multiple SPI (and I2C) hardware ports but that would be overkill for my small application.

Compiler version: 3.249

[Ttelmah]

For master, software SPI, is easy. If you look at the example files, many of them perform SPI, by simple bit-banging, without making any use of the SPI hardware. The latter (V4) compilers, also allow a software SPI implementation, without having to do the bit-banging yourself. _Slave_, is impossible at faster data rates without the hardware. It can be done at (very) low rates.
Remember also, that one master can drive multiple slave devices, provided you are using a select line on the slaves.

Best Wishes

[starfire151]

Thanks very much for the reply!

I only need the one upstream Slave interface so I will dedicate it to the hardware port of my 18LF2620. I should be able to bit-bang the downstream (Master interface) devices at a slower rate.

Thanks, again, for the response.


Dave

[PCM programmer]

Example:
http://www.ccsinfo.com/forum/viewtopic.php?t=26888