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--- network_protocol_programming_lab:change_frequency [2020/05/22 09:53] – [Tasks] rathke
+++ network_protocol_programming_lab:change_frequency [2021/04/19 12:40] (current) – [Tasks] rathke
@@ Line 19: / Line 19: @@
 This task requires
-  * a ready BeagleBone Black equipped with the CC1200
+  * a ready BeagleBone Black equipped with the CC1200.
-  * one TI Development Kit for the CC1200
+  * 4C attached to a second BeagleBone Black equipped with the CC1200.
-  * Smart RF Studio.
 ===== Tasks  =====
   * the programming is done by reusing the source files of lesson [[network_protocol_programming_lab:15.3_2_exercise|2. Exercise: Packet Reception]]. Make a copy of the files.
-  * Read chapter 8 about the packet handling of the [[http://www.ti.com/lit/ug/swru346b/swru346b.pdf?ts=1588225642109|CC1200 Users Guide]] and implement it.
+  * Change the symbol rate to 1.2 kBaud and the preamble count to 6 bytes. If necessary reexport the register value from 4C.
-  * Bring SmartRF Studio in “Packet TX” mode, change the ''length config'' to fixed and change the ''Length'' field to the value used in the export file
+  * Read chapter 9.12 ff. about programming the RF frequency in the [[http://www.ti.com/lit/ug/swru346b/swru346b.pdf?ts=1588225642109|CC1200 Users Guide]] and implement it.
-  *  start the transmitter. At the receiver, the BeagleBone Black, You should now receive the packets.
+  * you should implement a function for programming the frequency and printing the current programmed frequency.
+  * for testing compare your computed values of the FREQ registers with SmartRF Studio.
+  * In your program, set RF to an arbitrary value (e.g. 851 MHz) within the supported frequency band of CC1200.
+  * In SmartRF Studio also change the symbol rate to 1.2 kBaud and the preamble count to 6 Bytes.
+  * Bring 4C in “TX Packet Mode" using the default frequency (858MHz).
+  * start the transmitter. At the receiver, the BeagleBone Black, you should now receive **NO** packet.
+  * Now, stop the transmitter and change the frequency to your selected frequency.
+  * Now, you should be able to receive the packets.
-If you are able to receive packets in fixed length mode, the next step will be to receive packets in variable length mode:
+===== Hints  =====
-  * go back to SmartRF Studio and change the ''length config'' to ''variable''
+  * take care on rounding errors. E.g. the frequency should be 868 MHz and not 867.5 MHz.
-  * look, which registers have been changed.
-  * modify the changed registers in your program. You do not need to reexport the complete registers.
-  * now, implement variable length packets and test it.