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AsteRx-m3 OEM
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2.11
SD Memory Card Usage
The receiver can interface to an external SD memory card through the SD-card pins of the
30-pin connector. The receiver supports the 1-bit SD transfer mode with 3V3 signaling.
An example circuit to a 9-pin SD memory card socket is shown below. The maximum clock
frequency (SD_CLK) is 33.000 MHz.
See instructions in the Reference Guide for details on how to configure SD card logging.
The receiver is compatible with SD cards of up to 32GB. The file system is FAT32.
Shortly driving the button pin (pin#25 of 30-pin connector) low toggles logging on and off.
Driving the button pin low for at least 5 seconds unmounts the SD card if it was mounted,
or mounts it if it was unmounted. The SD card mount status can be checked with the
LOGLED pin (see Appendix A).
When powering off the receiver while logging is ongoing, it can be that the last seconds of
data are lost. To avoid data losses, it is advised to first unmount the SD card. This can be
done in two ways:
1.
By entering the command
“
exeManageDisk, DSK1, Unmount
”
before turning off
the receiver.
2.
By driving the button pin (pin#25) low for at least 5 seconds before turning off the
receiver.
