151 lines
2.9 KiB
Bash
Executable File
151 lines
2.9 KiB
Bash
Executable File
#!/bin/sh
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#
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# Configure LTC2145 ADC via SPI.
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#
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# This only works on a 4-input Red Pitaya.
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#
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# Run spi-pipe with the correct parameters.
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run_spi_pipe() {
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spi-pipe -d "$1" -m 0 -s 1000000 -l 0 -B 8 -b 2 -n 1 >/dev/null
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}
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# Initialize both ADCs.
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adc_init() {
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force=
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dcs=0
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shift
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while [ -n "$1" ]; do
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case "$1" in
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--force)
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force=1
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;;
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--dcs)
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dcs=1
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;;
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*)
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echo "ERROR: Unknown option '$1'" >&2
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exit 1
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esac
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shift
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done
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if [ -z "$force" ]; then
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echo "ERROR: Not initializing ADC without --force option." >&2
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exit 1
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fi
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for spidev in /dev/spidev0.0 /dev/spidev0.1 ; do
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echo "Initializing ADC via $spidev"
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# Reset register (address = 0x00)
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#
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# bit 7 = RESET
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#
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printf '\000\200' | run_spi_pipe $spidev
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# Timing register (address = 0x02)
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#
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# bit 0 = DCS
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# bits 2:1 = CLKPHASE
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# bit 3 = CLKINV
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#
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printf '\002\20'"$dcs" | run_spi_pipe $spidev
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# Output mode register (address = 0x03)
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#
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# bits 1:0 = OUTMODE (2 = double data rate CMOS output mode)
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# bit 2 = OUTOFF
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# bit 3 = TERMON
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# bits 6:4 = ILVDS
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#
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printf '\003\002' | run_spi_pipe $spidev
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done
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}
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# Write data format register.
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adc_format() {
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# Data format register (address = 0x04)
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#
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# bit 0 = TWOSCOMP
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# bit 1 = RAND
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# bit 2 = ABP
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# bits 5:3 = OUTTEST
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d1=0 # octal digit 1 = OUTTEST
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d0=0 # octal digit 0 = RAND*2
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shift
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while [ -n "$1" ]; do
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case "$1" in
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--testzero)
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d1=1
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;;
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--testone)
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d1=3
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;;
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--testchecker)
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d1=5
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;;
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--testalter)
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d1=7
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;;
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--rand)
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d0=2
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;;
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*)
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echo "ERROR: Unknown option '$1'" >&2
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exit 1
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esac
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shift
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done
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for spidev in /dev/spidev0.0 /dev/spidev0.1 ; do
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printf '\004\0'"${d1}${d0}" | run_spi_pipe $spidev
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done
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}
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case "$1" in
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init)
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adc_init "$@"
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;;
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format)
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adc_format "$@"
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;;
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*)
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script="${0##*/}"
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cat <<EOF
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Usage: $script {init|format}
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$script init {options}
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Reset ADCs and initialize timing and output mode.
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This must NOT be done while the FPGA is active.
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options:
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--force Required option to override warning.
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--dcs Enable clock duty cycle stabilizer.
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$script format {options}
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Configure data format.
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By default, disables test patterns and disables output randomizer.
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options:
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--testzero Enable all-zero test pattern.
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--testone Enable all-one test pattern.
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--testchecker Enable checkerboard test pattern.
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--testalter Enable alternating test pattern.
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--rand Enable output randomizer mode.
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EOF
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exit 1
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;;
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esac
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exit $?
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