Initially there is an issue hearing a signal. RX Device 0 and 1 have no
RSSI even if a strong signal is transmitted on their receive frequency. RX
Devices 2 and 3 both show an RSSI change with a transmitted signal.
I'll try to see if one of them can trigger the interrupt line. Initial
testing suggests they do not.
On Mon, Feb 26, 2024 at 9:05 PM Bob Stricklin via pacsat-dev <
pacsat-dev@amsat.org> wrote:
I just checked a board and I see the RX3 sitting at GND state. Assuming
the TMS570 is programmed to be an input the AX5043 must be pulling this
line down to a low state.
The IRQ line is pin 19 and they all have a via close by that you could
scratch the solder mask off of and measure the voltage. If they are
programed correctly and receive data this line should go high and stay
there until the buffer is cleared.
Bob
On Feb 26, 2024, at 7:15 PM, Burns Fisher (AMSAT) via pacsat-dev <
pacsat-dev@amsat.org> wrote:
Also remember that none of the interrupt lines has been tested. As I
recall Tx does not need it, but Rx does. This could be software. Is it
possible to jump the IRQ line manually somehow to see if you get an
interrupt out of it?
73,
Burns Fisher, WB1FJ
*AMSAT(R) Engineering -- Flight Software*
On Mon, Feb 26, 2024 at 8:05 PM Bob Stricklin via pacsat-dev <
pacsat-dev@amsat.org> wrote:
Both Chris and Jim have their boards to work with. Chris has started to
work with his and rotors TX is sending packets but not receiving any
packets yet. Still working to understand issue.
It could be hardware or software.
To help sort out issues with the AX5043 I have made up a table (attached)
to correlate the Select, IRQ lines with the physical chip on the board. All
four AX5043s should have an RX signal so in theory any one of them could be
used to receive signals. However there could be a hardware issue with any
of them. The RX3 AX5043 at the top of board is configured to work single
ended. The three other devices are working differentially. The code may
need different register settings for each of these to work properly but in
terms of the AX5043 I think they all should be looking for a differential
signal. I expect the signal strength of RX3 will be lower.
Bob
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--
Chris E. Thompson
chrisethompson@gmail.com
g0kla@arrl.net
Chris Thompson