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Firmware » History » Revision 2

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laforge, 02/19/2016 10:50 PM


PageOutline = OsmoSDR Firmware =

The OsmoSDR firmware is written in C language. It uses a modified version of the Atmel-provided sam3u drivers (at91lib).

There are multiple firmware images available, providing different interfaces towards the host PC.

Firmware Variants

There are multiple firmware images available, providing different interfaces towards the host PC.

=== standard (usb-audio) firmware ===

The standard firmware image exports a composite USB device with two interfaces: * A USB standard audio class device (for actual received baseband samples) * A USB CDC-ACM serial device (for hardware control like tuning)

The audio class device offers (at least) two sample rates: * a high sample rate (1/2/4 MHz) for USB Audio drivers like the ALSA driver included in mainline Linux * a low sample rate of 96 kHz (possibly 128 kHz) to work with the poor USB Audio driver of MS Windows OSs

Firmware flashing

There are two methods of flashing the firmware:

=== DFU firmware flashing ===

This is currently being worked on. FIXME.

=== SAM-BA / rum-ba firmware flashing ===

The sam3u contains a ROM based recovery boot loader called "SAM-BA". To activate this loader,
you have to * power down the device * close the ERASE jumper * power up the device (1 second is sufficient) * power down the device * remove the ERASE jumper * power up the device again

You will now the SAM-BA enumerate on USB using the following parameters: * Vendor ID 0x03eb * Product ID 0x6124 * String: "Atmel Corp. at91sam SAMBA bootloader"

The SAM-BA loader exports a CDC-ACM (virtual serial port) interface.

You can now use either Atmel's original host PC software (large, complex) or the {{{rum-ba}}} program provided by OsmoSDR to flash the full firmware image: {{{
$ ./rumba /dev/ttyACM0 flash firmware_file_name.samba
}}}

Firmware building

You first need to build and/or obtain a Cortex-M3 [wiki:Toolchain].

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Updated by laforge about 8 years ago · 2 revisions

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