[riot-devel] Port of RIOT on Samr21

Baptiste Clenet bapclenet at gmail.com
Wed Oct 22 15:56:15 CEST 2014

Thanks a lot!
So I'm going to let uart.c like this and begin I2C.c right now.


2014-10-22 15:35 GMT+02:00 Thomas Eichinger <thomas.eichinger at fu-berlin.de>:

> Hi Baptiste,
> > On 22 Oct 2014, at 15:08, Baptiste Clenet <bapclenet at gmail.com> wrote:
> > Thomas, I'm looking at the uart.c that you wrote. Why did you only
> develop one UART?
> The intention was to get preliminary support for this board fast. For this
> I chose to implement
> one UART using one SERCOM. It can be seen as prototype and be applied to
> additional
> SERCOMs if needed.
> > After reading the datasheet, I see that the samd21 has got 5 SERCOM
> which can be used by USART, I2C, SPI and LIN slave.
> > With RIOT, we can set 4 USART and 4 I2C. How do we proceed with the 5
> I’d suggest we take one SERCOM for SPI (needed for the radio device) and
> one for I2C to provide
> an example implementation for someone interested into this board. How many
> of each of them
> (SPI,I2C,USART) one would actually use later could then be configured via
> periph_conf.h by adopting
> to individual needs. One could say I don’t need an USART I’ll take the
> spare SERCOM to physically
> connect another SPI device or similar.
> > You chose PIN_PA04 and PIN_PA05 for UART 0. Which one should I use for
> UART 1,2,3?
> > And Atmel chose to define I2C on PIN_PA16  and PIN_PA17, on which pin
> will be the following I2C?
> For this we’d have to consult the multiplexing table in the Atmel data
> sheet p. 12. There are not
> too many possible combinations.
> Currently I’m busy developing sensor drivers for the iot-lab_M3 for a demo
> we give beginning
> of November. When these are done the samr21 will get some more love again.
> :)
> Best, Thomas
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*Clenet Baptiste*
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