direct test mode : TX power commands

RE: direct test mode : TX power commands

norbt — Wed, 09 Mar 2016 23:57:48 GMT

@Jean-Louis Bonnaffé What would be the sequence to send the Power command? Before the 2-Byte Frequency-Payload lenght-payload type command, or after?

RE: direct test mode : TX power commands

Jean-Louis Bonnaffé — Wed, 24 Feb 2016 08:46:50 GMT

@norbt correct

RE: direct test mode : TX power commands

norbt — Wed, 24 Feb 2016 01:11:13 GMT

There is probably a typographic error in the reference manual,

0xD8 --> -40 dBm
0xE2 --> -30 dBm

RE: direct test mode : TX power commands

norbt — Wed, 24 Feb 2016 01:05:06 GMT

So in this case, [bit 07-00] remain constant with value 0x0B, with only change in TXPOWER/dBm. Correct?

RE: direct test mode : TX power commands

Jean-Louis Bonnaffé — Tue, 25 Aug 2015 09:15:39 GMT

yes. check the nRF51 reference manual, page 93. The value -30dBm maps to 0xD8.

RE: direct test mode : TX power commands

hans stauber — Tue, 25 Aug 2015 08:41:53 GMT

Can you explain how a value of -30dBm results in a value of 0xD8.

RE: direct test mode : TX power commands

Jean-Louis Bonnaffé — Mon, 16 Mar 2015 17:45:53 GMT

OK, so if anyone is interested one day, this patch will add support for vendor-specific commands that need 8-bit wide 'frequency' field.

One practical example: I want to set NRF51822 radio power value to -30dBm. The TXPOWER register's value is a negative 8-bit value, so DTM won't handle it (it will read the 6 LSB, then cast them as uint32_t).

After applying the patch to ${SDK_PATH}/nrf51422/Board/nrf6310/direct_test_mode/main.c, you can send the following 2-byte command :

[bit 15-08] TXPOWER : 0xD8 (-30dBm)
[bit 07-02] LENGTH : 0b000010 (2 bytes)
[bit 01-00] PAYLOAD : 0b11 (vendor-specific)

In bash for example:

$ echo -ne '\xD8\x0B' > /dev/ttyUSB0