I'm developing a device that will have a flash chip and a RTC on the same SPI bus, selected using two different select lines. I also have a front panel for this device that needs to access these devices and is currently wired up to a UART, but I'm thinking of making it also an SPI device so I wouldn't have to use the extra pins.
My basic question is this - could I somehow have the front panel MCU, which will be an SPI slave, talk to the other slave devices on the bus somehow? If not, how would I be able to achieve this? I'm thinking about doing this by re-initializing the SPI bus by causing an interrupt on my main MCU, but I'd rather first see if anyone here knows if I can do slave to slave SPI comms.
Thanks for any help.