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Srikanth Govindavajjala
Srikanth Govindavajjala
Associate
February 7, 2018
Question

Frequency and channel setting of SPIRIT1 for 400-406MHz

  • February 7, 2018
  • 1 reply
  • 1281 views
Posted on February 07, 2018 at 04:58

Hello,

I want to operate the SPIRIT1 in the frequency range of 400 MHz to 406 MHz. And channel spacing of 200KHz. That means my first frequency is 400.2 MHz and if i want to go for the next frequency it could be 400.4 MHz and so on.  Can anyone send me the Synthesizer setting values and what Crystal has to be used to operate in the frequency range.

Thanks,

Srikanth

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1 reply

balmukund66
balmukund66
Associate III
February 12, 2018
Posted on February 12, 2018 at 05:32

Hello,

Yes,the freq will be :400MHz,400.2MHz,400.4MHz... 

One way is shown below:

radioInit.xModulationSelect = MODULATION_SCHEME;

radioInit.lFrequencyBase = BASE_FREQUENCY+(CHANNEL_NUMBER*CHANNEL_SPACE);

radioInit.lDatarate = DATARATE;

radioInit.lFreqDev = FREQ_DEV;

radioInit.lBandwidth = BANDWIDTH;

RadioInit(&radioInit);

Regarding Crystal: 50 MHz crystal can be used (Same for all bands).

Thanks & Regards,

Balmukund Prasad

Srikanth Govindavajjala
Srikanth GovindavajjalaAuthor
Associate
February 12, 2018
Posted on February 12, 2018 at 13:07

Hi Prasad,

Thanks for reply. Can you please share me an example how to set the frequency and other parameters of any particular frequency. That will help me to move further.

Thanks,

Srikanth

balmukund66
balmukund66
Associate III
February 13, 2018
Posted on February 13, 2018 at 05:12

Hello,

Below is the path to fimrware(X-Cube-SUBG1  V2.0.0) for P2P communication:

http://www.st.com/content/st_com/en/products/embedded-software/mcus-embedded-software/stm32-embedded-software/stm32cube-expansion-packages/x-cube-subg1.html

 

Open project:

STM32CubeExpansion_SUBG1_V2.0.0\Projects\Multi\Examples\P2P_demo\EWARM.

Thanks & Regards,

Balmukund Prasad

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