162 lines
3.3 KiB
INI
162 lines
3.3 KiB
INI
# SPDX-License-Identifier: GPL-2.0-or-later
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# Xilinx XADC support for 7 Series FPGAs
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#
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# The 7 Series FPGAs contain an on-chip 12 bit ADC that can probe die
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# temperature, internal power supply rail voltages as well as external
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# voltages. The XADC is available both from fabric as well as through the
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# JTAG TAP.
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#
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# This code implements access through the JTAG TAP.
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#
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# https://www.xilinx.com/support/documentation/user_guides/ug480_7Series_XADC.pdf
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# build a 32 bit DRP command for the XADC DR
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proc xadc_cmd {cmd addr data} {
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array set cmds {
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NOP 0x00
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READ 0x01
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WRITE 0x02
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}
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return [expr {($cmds($cmd) << 26) | ($addr << 16) | ($data << 0)}]
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}
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# XADC register addresses
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# Some addresses (status registers 0-3) have special function when written to.
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proc XADC {key} {
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array set addrs {
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TEMP 0x00
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LOCK 0x00
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VCCINT 0x01
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VCCAUX 0x02
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VAUXEN 0x02
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VPVN 0x03
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RESET 0x03
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VREFP 0x04
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VREFN 0x05
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VCCBRAM 0x06
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SUPAOFFS 0x08
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ADCAOFFS 0x09
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ADCAGAIN 0x0a
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VCCPINT 0x0d
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VCCPAUX 0x0e
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VCCODDR 0x0f
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VAUX0 0x10
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VAUX1 0x11
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VAUX2 0x12
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VAUX3 0x13
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VAUX4 0x14
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VAUX5 0x15
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VAUX6 0x16
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VAUX7 0x17
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VAUX8 0x18
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VAUX9 0x19
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VAUX10 0x1a
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VAUX11 0x1b
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VAUX12 0x1c
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VAUX13 0x1d
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VAUX14 0x1e
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VAUX15 0x1f
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SUPBOFFS 0x30
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ADCBOFFS 0x31
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ADCBGAIN 0x32
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FLAG 0x3f
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CFG0 0x40
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CFG1 0x41
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CFG2 0x42
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SEQ0 0x48
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SEQ1 0x49
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SEQ2 0x4a
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SEQ3 0x4b
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SEQ4 0x4c
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SEQ5 0x4d
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SEQ6 0x4e
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SEQ7 0x4f
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ALARM0 0x50
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ALARM1 0x51
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ALARM2 0x52
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ALARM3 0x53
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ALARM4 0x54
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ALARM5 0x55
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ALARM6 0x56
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ALARM7 0x57
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ALARM8 0x58
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ALARM9 0x59
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ALARM10 0x5a
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ALARM11 0x5b
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ALARM12 0x5c
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ALARM13 0x5d
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ALARM14 0x5e
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ALARM15 0x5f
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}
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return $addrs($key)
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}
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# Select the XADC DR
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proc xadc_select {tap} {
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set XADC_IR 0x37
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irscan $tap $XADC_IR
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runtest 10
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}
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# XADC transfer
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proc xadc_xfer {tap cmd addr data} {
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set ret [drscan $tap 32 [xadc_cmd $cmd $addr $data]]
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runtest 10
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return [expr "0x$ret"]
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}
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# XADC register write
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proc xadc_write {tap addr data} {
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xadc_xfer $tap WRITE $addr $data
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}
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# XADC register read, non-pipelined
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proc xadc_read {tap addr} {
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xadc_xfer $tap READ $addr 0
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return [xadc_xfer $tap NOP 0 0]
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}
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# convert 16 bit register code from ADC measurement on
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# external voltages (VAUX) to Volt
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proc xadc_volt {code} {
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return [expr {$code * 1./(1 << 16)}]
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}
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# convert 16 bit temperature measurement to Celsius
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proc xadc_temp {code} {
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return [expr {$code * 503.975/(1 << 16) - 273.15}]
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}
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# convert 16 bit suppply voltage measurement to Volt
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proc xadc_sup {code} {
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return [expr {$code * 3./(1 << 16)}]
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}
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# perform a single channel measurement using default settings
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proc xadc_single {tap ch} {
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set cfg0 [xadc_read $tap [XADC CFG0]]
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set cfg1 [xadc_read $tap [XADC CFG1]]
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# set channel
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xadc_write $tap [XADC CFG0] $cfg0
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# single channel, disable the sequencer
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xadc_write $tap [XADC CFG1] 0x3000
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# leave some time for the conversion
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runtest 100
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set ret [xadc_read $tap [XADC $ch]]
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# restore CFG0/1
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xadc_write $tap [XADC CFG0] $cfg0
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xadc_write $tap [XADC CFG1] $cfg1
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return $ret
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}
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# measure all internal voltages
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proc xadc_report {tap} {
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xadc_select $tap
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echo "TEMP [format %.2f [xadc_temp [xadc_single $tap TEMP]]] C"
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foreach ch [list VCCINT VCCAUX VCCBRAM VPVN VREFP VREFN \
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VCCPINT VCCPAUX VCCODDR] {
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echo "$ch [format %.3f [xadc_sup [xadc_single $tap $ch]]] V"
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}
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}
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