I am working on a project that is using an ATtiny861A and this only has one SPI. If I want to hook up a radio and an external memory to the same SPI, will there be an issue sending data from the external memory to the radio? I know I can hook up the external memory and the radio to the same SPI but I am not sure if the radio will be able to send the data saved on the external memory.
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\$\begingroup\$ Any particular radio? \$\endgroup\$– Ignacio Vazquez-AbramsCommented May 20, 2015 at 14:52
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\$\begingroup\$ It will be a CC2520 from Texas Instruments \$\endgroup\$– TherusscherCommented May 21, 2015 at 17:39
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\$\begingroup\$ I'm fairly sure you could run that as a master, making a multi-master system. \$\endgroup\$– Ignacio Vazquez-AbramsCommented May 21, 2015 at 18:01
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Your micro is the master and as such you can't get this type of bus to interact slave-to-slave. It's a case of reading the memory into the micro and then forwarding this to the radio i.e. the micro must buffer the data when sending it between slaves.
answered May 20, 2015 at 14:09
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\$\begingroup\$ So they can communicate but the Micro-controller needs to hold the data before it is sent? Would this all be done in the coding? \$\endgroup\$ Commented May 20, 2015 at 14:11
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\$\begingroup\$ Yes, it is done in the micro's coding \$\endgroup\$– Andy akaCommented May 20, 2015 at 14:16
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\$\begingroup\$ @Therusscher SPI being Master-Slave protocol, Everything must go through Master \$\endgroup\$– SwanandCommented May 21, 2015 at 10:04