Last time I posted, I said I’ve make them work. Well that’s absolutely true, but know I’m stuck again, because I want to learn more about this module and I’m working with a whole new circuit.
Hardware is 100% tested and works fine… I think the problem is software.
As I couldn’t move forwards with the new project i decided to go back to the working one and try to understand why the new one isn’t. What I do is change things in the working project until it stop working, so I can figured out what could be the problem with the new one.
Some curious things happend… :shock:
My first guess was that it was all about timming. But I deleted EVERY line refered to this in the working project and it still works… I mean, there’s no delay no nothing and it still works.
The working project works with a SPI at 1Mbps… The next thing to do was change the baud rate… Now here’s the problem… No matter what speed I set up, the module won’t work unless the speed is 1Mbps. With or without the timming.
As you know, if you connect the module to 3.3v and set CE high and CS low, without sending any config work, the module will work as a Transmitter in Direct Mode by default, rigth? So if you do so and scope the DATA pin you should see it toggling.
Now, if you config it as a Receiver in ShockBurst Mode and set CE high and CS low, then the DATA pin won’t toggle and remain at ~3.3v. (That is if you don’t retrive the data from the module)
So I guess this is a good way (and excellent one) to verify if at least you’re entreing in config mode. That’s the closer you can get to a feedback.
Well, as I said in the prev post it won’t work unless the speed of the SPI is set to 1Mbps.
When I change the speed (either higher or lower) I can tell I’m not entering in config mode because the DATA pin toggle when it shoudn’t. Is like the module won’t recive the config word I send.
Do anyone have any idea of what could be goign on???
Hi, i´m working with shockburst at 1Mbps (on air) 8bit CRC, 5 bytes addres, 5 bytes payload…
00 28 00 00 00 00 00 xx xx xx xx xx A1 6F 05 (config word)
when I use a clock in the spi port of the micro (pic16f887) in 250k or 125k i can´t have data on the receiver… but only on 62500 in the spi speed I can receive… I use 115.2K in usart, my fosc is 4Mhz…
which was the speed at spi port on your microcontroler??
