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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
<pre>
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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.
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