SDR (Software Defined Radio) » OsmoSDR

= Firmware build =

 * check out at91lib.git and osmo-sdr.git into the same ancestor directory

 * change to osmo-sdr/firmware/sdr-test-project

 * 'make flash'

 * use rum-ba to flash it:

  * rumba /dev/ttyACM0 flashmcu osmo-sdr-test-osmo-sdr-at91sam3u4-flash.bin

= Firmware usage guide =

== Serial console ==

On the serial console, you can enter three types of commands:

 * actions denoted by ! at the line end

 * getting a value, denoted by a ? at the line end

 * setting a value in key=value notation

A list of commands can be obtained by entering ? on an empty line

Enter always re-sets the parser, so you can abort any unfinished command with enter

=== Examples ===

{{{

 > tuner.init!

 > tuner.freq=88300000

 > tuner.gain=2,2,2,2,2,2

 > tuner.freq?

tuner.freq:88299997

}}}

=== Reference ===

{{{

?

Supported commands:

tuner.init  --  Initialize the tuner

tuner.freq  --  Tune to the specified frequency

tuner.gain  --  Tune to the specified gain

tuner.flt_bw_mix  --  Filter bandwidth (Mixer)

tuner.flt_bw_chan  --  Filter bandwidth (Channel)

tuner.flt_bw_rc  --  Filter bandwidth (RC)

si570.freq  --  Change the SI570 clock frequency

si570.dump  --  Dump SI570 registers

fpga.dump  --  Dump FPGA registers

fpga.pwm1_div  --  PWM divider, Freq = 80MHz/(div+1)

fpga.pwm1_duty  --  PWM duty cycle

fpga.pwm2_div  --  PWM divider, Freq = 80MHz/(div+1)

fpga.pwm2_duty  --  PWM duty cycle

fpga.adc_clkdiv  --  FPGA Clock Divider for ADC (80 MHz/CLKDIV)

fpga.adc_acqlen  --  Num of SCK cycles nCS to AD7357 is held high betewen conversions

ssc.start  --  Start the SSC Receiver

ssc.stop  --  Start the SSC Receiver

ssc.stats  --  Statistics about the SSC

ssc.dump  --  Dump SSC DMA registers

}}}

== Taking a capture ==

 1. flash the firmware

 1. connect the device to usb, it should enumerate as usb audio device

 1. connect to the UART

 1. issue the following commands once

   1. {{{tuner.init!}}}

   1. {{{tuner.freq=88300000}}}

 1. start your audio recording app, e.g. {{{arecord -c 2 -f S16_LE -D hw:1,0 foo.wav}}}

You can re-tune the frequency and/or issue other commands while the transfer of samples is running.

The bottom green led under the antenna socket should be dark green, not completely off.