American QRP Club NUE-PSK Gebruikershandleiding - Pagina 10

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10)

Updating Modem Software

Increasingly today, microcontrolled projects have an ability to be "field updated" with

new features and software updates made available by the designers. So, instead of

needing to send your instrument back for re-programming to get these new capabilities

and bug fixes, you can simply download the latest-and-greatest software from the

Internet and send it to the target hardware and the device automatically updates its

internal memory with the new program.

What a great way to keep your project

completely up to date with the latest features!

We have incorporated this field updating capability into the NUE-PSK Digital Modem.

You just need to connect your PC serial port to the modem using a simple adapter, and

send it the new software obtained from the NUE-PSK website whenever new

capabilities are made available.

We designed a TTL serial port into the modem, accessible via a 4-pin connector P4

located inside the battery compartment. Just connect your computer's USB port to an

inexpensive USB-to-TTL adapter such as the CP2102 from SparkFun

, plug it into P4

and run the Modem Loader program on the PC. Then pressing the Select button when

turning the modem on will initiate the bootload sequence to "burn" the new software into

the modem's controller. Once you power-cycle the modem, you'll be running the latest

software release containing, for example, a new digital mode, some new I/O

capabilities, and so on. This is really quite a convenient and powerful capability for the

project.

Photo 10: CP2102 USB-to-TTL interface from

Figure 5: Schematic of an easy RS-232 interface

SparkFun

to the NUE-PSK Digital Modem

Loading New Software

NUE-PSK Digital Modem Operator's Manual, ver 1.20