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10 years, 9 months ago.
mbed Implementation of SPI(Master) To UART Conversion
Does anybody fried to implement a SPI Master to UART conversion using mbed? Is it possible? Most of the SPI-to-UART converter out there are either SPI Mode 1 and/or SPI Slave. I would like to have allow for the SPI to interface with a Analog device ADIS16480 IMU.
3 Answers
10 years, 9 months ago.
Have you checked the price?
Mouser - http://www.digikey.com/product-detail/en/ADIS16480AMLZ/ADIS16480AMLZ-ND/3467725
$2,241.47
Newark - http://www.newark.com/analog-devices/adis16480-pcbz/adis16480-pcb-eval-bd-pb-free/dp/94T9410
$3,348.16
Hiring someone to write the code for you might be easiest.
10 years, 9 months ago.
The mbed handbook is a good place to start. Take a look at the APIs for SPI Master and UART:
http://mbed.org/handbook/Serial
If the mbed is dedicated to SPI-to-UART, you can have a loop running forever that reads from SPI and sends the data over UART. (Or vice versa, in that case, take a look at Serial::readable())
-Kevin
10 years, 9 months ago.
Yes you can do it with a €50 mbed, you can also do it with a €1,20 ATtiny2313, or a €3,50 ATMega328 (the Arduino chip). Even a complete Arduino Uno is cheaper than the Mbed and for this simple task will do just as well. What else do you need to do?
Didn't try it myself, but no reason why it shouldn't be possible. Should actually be pretty straightforward.
posted by Erik - 07 Jul 2013UART communication is typically 8-bit at a time, the SPI communication is 16 bit at a time. You need some kind of synchronisation mechanism or a protocol in order to combine the correct UART bytes into an SPI word. Alternatively you can define a higher level protocol that allows to work with real data rather than raw registers.e.g. something similar to NMEA sentences
posted by Ad van der Weiden 08 Jul 2013