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============================= >From original message >> I want it to send out 12 0's in addition to sending >the sink block a command to adjust the gain. I believe sending out the 12 0's >should be handled in the forecast function In my understanding, what you want to change is the work/general_work function. (I've never had to change the forecast function.) Handling consume/produce through the general_work function: -- The return <integer> call tells the system that your block has PRODUCED <integer> number of samples on its output stream. --The self.consume_each(<integer>) or consume() call tells the system that your block no longer needs <integer> number of old inputs from all streams/that specific stream. I would do it in the following way: --Make a general block with 1 streaming INput, 1 streaming OUTput and 1 message output. --When condition is met: ------In the general_work function send the gain message when your condition is met ------In the general_work function, set 12 output stream samples to 0, when condition is met, and do "return 12". --When condition is not met: ------Tell system that your block produced nothing by calling "return 0". Regards, AB ________________________________ From: Bakshi, Arjun Sent: Thursday, July 13, 2017 2:48 PM To: [email protected]; [email protected] Subject: Re: [Discuss-gnuradio] OOT Block to Automatically adjust Transmit Gain Couldn't figure out how to reply from the digest, so I'm making a new post. New to this. Original message/context: ============================== From: Tellrell White I'm currently in the process of creating a block in python that does two things; takes in? a certain number of input items, and once it reaches a certain number of input items 2) it sends a command to the UHD USRP sink block to adjust its gain by a certain amount. I have a few questions. 1) Is it even possible to create a single block that can accomplish both these tasks? 2) How exactly do I make this block issue the command to adjust the gain after it receives a certain number of values??Below is some code that I currently have constructed for this purpose. I'm pretty new to python so I'm sure this code is probably not the most efficient way but any suggestions are welcome. =============================== Hey Tellrell, 1) I think it can be achieved using 1 block. The block will need to output a message with "gain" and the gain value whenever the input matches your condition. Connect the output message port to the USRP sink's command port. Message should be a pmt that looks something like ("gain", value). More info on the command port: https://gnuradio.org/doc/doxygen/page_uhd.html#uhd_command_syntax 2) I went ahead and implemented something as an example. Increases gain upto a limit and then starts over again. See attached code, xml for block, rxed signal plot, and flowgraph pic. I'm new to this too, so hopefully other will correct my mistakes. Regards, AB
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