Your Name
72 lines
1.4 KiB
Bash
Executable File
72 lines
1.4 KiB
Bash
Executable File
#!/bin/bash -e
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# Read and control VCS rails by sending the UCD power sequencer I2C commands.
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# This script assumes that the UCD is controlling VCS rails as GPIOs 5 and 6.
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# Also assumes that those GPIOs are already enabled.
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ucd_bus="0"
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ucd_addr="0x64"
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ucd_retries="5"
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retry()
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{
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local i=0
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until [ $i -ge $ucd_retries ]; do
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i=$((i+1))
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retry_output=$("$@") && break
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done
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local ret=$?
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if [ $i -eq $ucd_retries ]; then exit $ret; fi
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}
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# Usage: ucd_get address
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# Result stored in $ucd_reg
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ucd_get()
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{
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retry i2cget -f -y $ucd_bus $ucd_addr "$1" b
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ucd_reg=$retry_output
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}
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# Usage: ucd_get address value
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ucd_set()
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{
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retry i2cset -f -y $ucd_bus $ucd_addr "$1" "$2" b
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}
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vcs_set_gpios()
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{
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echo -e "\tSetting UCD GPIO 5 to $1"
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ucd_set 0xFA 5
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ucd_set 0xFB "$1"
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ucd_set 0xFB "$1"
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echo -e "\tSetting UCD GPIO 6 to $1"
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ucd_set 0xFA 6
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ucd_set 0xFB "$1"
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ucd_set 0xFB "$1"
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}
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vcs_get()
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{
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echo Reading VCS settings
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ucd_set 0xFA 5
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ucd_get 0xFB
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local val=
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val=$(echo "$ucd_reg" | grep -i -c 0x0f)
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echo -e "\tUCD GPIO 5 state=$val"
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ucd_set 0xFA 6
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ucd_get 0xFB
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val=$(echo "$ucd_reg" | grep -i -c 0x0f)
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echo -e "\tUCD GPIO 6 state=$val"
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}
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if [ "$1" == "on" ]; then
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echo Turning on VCS
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vcs_set_gpios 0x7
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elif [ "$1" == "off" ]; then
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echo Turning off VCS
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vcs_set_gpios 0x3
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else
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vcs_get
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echo "$0 <on|off>" to set state
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fi
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