Add get CIR ability

[niamiot]

1. lib.py

• create "getDeviceCirData" method to obtain the CIR buffer of the device. According to POZYX_CIR_DATA datasheet, This take as parameters: CIR buffer offset and data length. The output fill a buffer of 98 bytes.

• create "getDeviceCir" method to aggregate the CIR buffers. This create the aggregation of multiple CIR buffers into a larger buffer. Real CIR coeff can be retrieve by taken even number index of the buffer whereas imaginary CIR coeff can be retrieve by taken odd number index.

2. generic.py

• create a "Buffer" class to handle the CIR buffer. This is a simple extension of the SingleRegister class handling list as value

3. /tutorials

• create a get_cir.py example to demonstrate the CIR obtention procedure.

[tfrost4]

Hello,
I'm writing to you because I'm currently working with pozyx trying to get the CIR information from registers. The scenario is very straightforward: to read the CIR info after doing a ranging between two nodes.
I found your code and I have updated my pozyx library. Code works fine except when using a value for data_length greater than 33. Beyond this value (34, 35, ..., 49), when doing two or three successives ranging, a "Ranging failed" message appears. Have you experienced dealing with this issue?
Thanks you for your answer.

T.

[hegxiten]

Thanks for the helpful information and I can confirm the same issue on firmware v2.2. I guess you can just live with the smaller data_length right? Couldn't think of a better solution other than putting an Arduino shield on it.